What will be the US national debt on December 31, 2026?

- [2026-09-17] Treasury's Debt to the Penny primary dataset (via Fiscal Data, last confirmed by secondary aggregator) showed total public debt outstanding at $40,093,343,468,150 on September 17, 2026, essentially flat versus the prior week, with debt held by the public at $32.39T and intragovernmental holdings at $7.70T. https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny

- [2026-09-18] The Debt to the Penny series shows the total has traded in a narrow $40.03–$40.18 trillion band since mid-August, moving from $39.89T on Aug 7 to a peak of $40.176T on Aug 31, then oscillating around $40.05–40.12T through mid-September rather than climbing steadily. https://www.indexbox.io/blog/us-public-debt-edges-lower-from-record-as-treasury-data-shows-mixed-components/

- [2026-08-18/19] 
Government debt eclipsed $40 trillion, with the total U.S. IOU hitting $40.05 trillion as of that Tuesday, some four and a half years after topping $30 trillion
, confirming the milestone crossing occurred in mid-August 2026, months earlier than prior CBO projections.

- [2026-08-18] 
Six months earlier, CBO had projected total borrowing would top out at $39.4 trillion for the fiscal year, but Treasury reported debt at $39.9 trillion and counting by mid-August
, indicating the debt trajectory is running ahead of official baseline forecasts.

- [2026-02] 
CBO's baseline projects the federal budget deficit in fiscal year 2026 at $1.9 trillion, growing to $3.1 trillion by 2036
, implying roughly $160 billion/month of average deficit-driven borrowing if spread evenly (actual borrowing is uneven, often bunched near quarter-end).

- [2026] The statutory debt ceiling stands at $41.1 trillion, 
having been lifted to that level by the One Big Beautiful Bill Act (OBBBA) signed into law on July 4, 2025
. As of Sept 17, debt was about $40.09T, leaving roughly $1.0T of headroom before the limit binds.

- [2026-06] 
Since the $5 trillion increase to $41.1 trillion, debt subject to the limit has increased by $2.9 trillion, consuming more than half of the increased borrowing authority; absent congressional action, the debt limit will most likely be reached between late winter and mid-summer of 2027
 — i.e., after December 31, 2026, so the ceiling is not expected to force a slowdown in debt growth before this question resolves.

- [2026-09-09] 
Once the $41.1 trillion cap is reached, Treasury can typically buy at least a few extra months using extraordinary measures; one economist's off-the-cuff estimate puts the limit being hit around February or March 2027
, further suggesting no binding constraint is expected by year-end 2026.

- [2026-09-09] 
Some Republicans have floated raising the debt limit as soon as the post-election lame-duck session through budget reconciliation
, which — if it happens before Dec 31 — would not itself change the actual debt total but could remove any perceived ceiling constraint on future issuance.

- [2026-08-19] 
Total US public debt surpassed $40 trillion for the first time, a roughly one-third increase in less than five years, and the debt keeps rising, adding nearly $7 billion each day according to the Peter G. Peterson Foundation
, consistent with the roughly $6 billion/day rate cited in the question's own framing.

- [Ongoing] The Debt to the Penny dataset is updated daily on business days (next release each weekday, e.g., data as of Sept 17 published Sept 18); the December 31, 2026 reading (likely published early January 2027, since Dec 31, 2026 is a Thursday) will be the exact resolution figure.

BOTTOM LINE: As of mid-September 2026 the debt stood just above $40.09 trillion and has been oscillating in a roughly $40.0–$40.2 trillion band for a month rather than climbing steadily; with a ~$1.9T FY2026 deficit and ~$6–7B/day average growth, and no debt-limit constraint expected to bind before spring 2027, the debt is likely to continue rising through year-end, plausibly landing somewhere in the low-to-mid $40 trillion range (very roughly $40.5–$41.5T) by December 31, 2026, though the ceiling of $41.1T could cause a temporary flattening if reached before a limit increase.

NOT FOUND: An official Treasury or CBO point projection specifically for December 31, 2026; confirmation of whether the debt limit will be raised again before year-end; the exact Debt to the Penny figure for dates after September 17, 2026 (most recent available reading in search results).

- [2024-07-29] The debt 
reached $35 trillion, having increased $2.35 trillion over the prior 12 months
, i.e., roughly $196B/month or $6.4B/day.
- [2023-12-26] One year earlier, 
the debt had increased $2.574 trillion over the trailing 365 days, standing less than $100 billion from $34 trillion
 — implying calendar year-end 2023 debt of about $34.0 trillion.
- [2024-12-09/16] Year-end 2024 debt was 
$36.13–$36.17 trillion, with the debt one year earlier at $33.82–$33.85 trillion, a roughly $2.3 trillion year-over-year rise
.
- [2025-12-03] 
Total gross national debt was $38.40 trillion, $2.23 trillion higher than one year prior, and $11.00 trillion higher than five years prior, with the past year's growth averaging $6.12 billion per day
. This confirms year-over-year growth has been remarkably stable at roughly $2.2–2.6 trillion/year for three straight years.
- [2025-12-03] JEC projected that at the trailing three-year average daily pace, 
the U.S. would reach $39 trillion by approximately March 6, 2026, with each additional trillion taking about 157 days
 — implying roughly $6.4B/day, consistent with 2023–2025 rates.
- [2026-01-12] Debt stood at 
$38.4 trillion as of January 12, 2026
, roughly in line with the JEC's December 2025 trajectory.
- [2026-08-18] Debt 
surpassed $40 trillion, arriving "months earlier than expected," with the $41.1 trillion debt ceiling potentially reached by "early next year"
 — a notable acceleration versus the flat ~$6B/day pace of 2023–2025, driven partly by the OBBBA's added deficits.
- [2026-08-18] Analysts noted 
the Bipartisan Policy Center's preliminary projection that Washington is on track to hit the debt limit between late winter and midsummer 2027, trending toward the earlier end of that range
, meaning the $41.1T ceiling should not bind before Dec 31, 2026.
- [2026-09-09] Confirming this timeline, 
Wrightson ICAP's chief economist projected the debt could hit the limit around February or March (2027), with the "x-date" falling in late 2027 or early 2028
, and 
federal revenue has come in below expectations after the Supreme Court ruled broad tariff powers illegal
, a factor that could push borrowing higher/faster than earlier baselines assumed.
- [2026-08-16] As of mid-August 2026, 
the national debt stood at $39.9 trillion, closing in on the $41.1 trillion ceiling
, with 
Fitch Ratings projecting the ceiling would be hit around mid-2027
.
- Historical comparable-window pattern (Sept 21 to Dec 31): in 2023, 2024, and 2025 the debt rose roughly $0.6–1.0 trillion from late September to year-end (consistent with the ~$6–6.4B/day trend); however 2026's growth rate through August (reaching $40T "months earlier than expected") appears to be running somewhat above the 2023–2025 baseline pace, suggesting the Sept–Dec 2026 increment could be modestly larger than prior years' comparable windows.

NOT FOUND: An authoritative, precise Dec 31 (calendar year-end) "Debt to the Penny" figure for 2023/2024/2025 pulled directly from the Treasury dataset (estimates above are triangulated from JEC/House Budget Committee trackers dated within days of Dec 31); a formal track record of prior CBO/Treasury point-forecast accuracy specifically for year-end debt levels a few months out (only debt-ceiling X-date forecast accuracy was found, not year-end total-debt forecast accuracy).

BOTTOM LINE: Over the last three comparable Sept-to-Dec windows the debt grew at a strikingly stable ~$6–6.4 billion/day, but the pace accelerated markedly in 2026 (crossing $40T "months earlier than expected"), and the $41.1T statutory ceiling is not expected to bind until at least February-2027, so the historical pattern points toward continued unimpeded growth to roughly $40.7–$41.3 trillion by December 31, 2026, with upside risk from the recent acceleration and downside risk only if a near-term ceiling/extraordinary-measures episode artificially freezes reported debt just before year-end.

**1. Current debt level and trend (most direct driver).** Treasury's Debt to the Penny series shows total public debt outstanding fluctuating just above/below $40.1 trillion through mid-September 2026, having crossed $40 trillion on August 18, 2026. 
Treasury's Debt to the Penny data shows total US public debt outstanding at $40,093,343,468,150 on September 17, 2026, a $736,959,641 decline from the prior record, with debt held by the public lower and intragovernmental holdings higher.
 Over the prior weeks the total oscillated in a narrow ~$40.05–40.18 trillion band. 
On Aug. 31, 2026, total public debt outstanding was about 40.176 trillion dollars… On Aug. 28, 2026, the total was approximately 40.104 trillion dollars.
 This is the primary, controlling input for resolution.

**2. Deficit trajectory (who controls it: Congress/Treasury spending & revenue).** CBO's most recent Monthly Budget Review shows deficits running above last year's pace. 
Based on information available through the end of July, CBO estimates that the fiscal year 2026 deficit will be $2.1 trillion—$200 billion more than the $1.9 trillion deficit projection that CBO published on February 11, 2026.
 
Revenues... are anticipated to be about $200 billion below the February projections, mostly because of smaller-than-expected collections of tariff duties—a result of a Supreme Court ruling
 striking down IEEPA tariffs. This roughly $2.1T/year pace (~$5.7–6B/day) is the baseline growth rate the debt will follow absent shocks, consistent with the Handelsblatt/AP figure of over $6 billion in new debt per day cited in the question background.

**3. Debt-limit constraint (controlled by Congress/Treasury Secretary).** 
The debt ceiling currently stands at $41.1 trillion, having been lifted to that level by the One Big Beautiful Bill Act (OBBBA) signed into law on July 4, 2025... which increased the limit by $5 trillion (rather than suspending it) to $41.1 trillion.
 Nonpartisan estimates place the binding X-date well after this question's Dec 31, 2026 resolution date: 
BPC now estimates that, absent congressional action, the U.S. will most likely reach the debt limit once again sometime between late winter and mid-summer of 2027.
 A separate estimate concurs: 
Based on projected borrowing needs, the federal government is likely to reach the $41.1 trillion debt limit by May 2027.
 This means legally the debt cannot rise above $41.1 trillion, but that ceiling is not expected to bind before Dec 31, 2026, so it is not a likely constraint on the year-end figure, though it puts a hard cap on how far above the current ~$40.1T level the number could realistically climb even in a high-borrowing scenario.

**4. Treasury cash-management/issuance behavior (controlled by Treasury Secretary Bessent).** BPC notes Treasury's cash buffer materially affects near-term debt issuance timing: 
Once the government's borrowing limit is reached, the Treasury Department would need to rely on its cash reserves and accounting maneuvers known as extraordinary measures to meet the nation's ongoing expenses.
 Ahead of hitting the limit, Treasury has discretion on how much cash to hold (it targeted roughly $950 billion in cash by the end of FY2026, per BPC's citation of Treasury guidance), and building versus drawing down that cash buffer can push measured "debt outstanding" up or down by tens of billions on any given date without changing underlying fiscal need — a source of short-term noise in the daily Debt-to-the-Penny series but not the year-end trend.

**5. Government funding/shutdown risk (controlled by Congress).** A shutdown could pause some routine reporting/administrative activity but historically has not stopped debt accumulation (interest and mandatory spending continue). Current status: 
With federal funding set to lapse at midnight on October 1, Congress moved early, passing a continuing resolution that President Trump signed into law on September 2, 2026... The bill keeps federal agencies funded at current levels through December 11, 2026
. This leaves a fresh funding deadline just 20 days before the question's Dec 31 resolution date, creating a modest event risk (another shutdown fight) that could add volatility to Treasury cash operations right before resolution, but is unlikely to materially change the debt total either way.

**What would have to happen, in order, for a materially different outcome:**
1. Deficit continues at ~$2.1T/year FY2026 pace (already largely locked in through Sept 30, FY2026 close) → carries debt to roughly $40.1–40.3T range by Sept 30.
2. Congress avoids/resolves the Dec 11, 2026 funding deadline (a shutdown itself wouldn't reduce debt growth, just possibly slow reporting).
3. FY2027 Q1 (Oct–Dec 2026) deficit accrues at a similar or slightly higher run-rate (given OBBBA tax provisions and elevated defense/Iran-related spending flagged by BPC), adding roughly $500–600B over the quarter if pace holds.
4. Debt limit (currently $41.1T) is not projected to bind before year-end, so no legal cap intervenes before Dec 31, 2026.

BOTTOM LINE: With debt already at ~$40.1 trillion in mid-September 2026 and growing at roughly $6 billion/day (a ~$2.1 trillion/year deficit pace per CBO), and with the $41.1 trillion debt ceiling not expected to bind until "late winter to mid-summer 2027," the trajectory strongly implies the debt will land somewhere in the roughly $40.7–41.1 trillion range on December 31, 2026, likely still comfortably below the statutory ceiling.

NOT FOUND: An official CBO or Treasury point estimate specifically for total debt outstanding on December 31, 2026; any indication that Congress plans to raise the debt ceiling again before year-end 2026; confirmed FY2027 full-year appropriations (only a CR through Dec 11, 2026 exists) that would specify Q1 FY2027 outlay levels precisely.

**Official/analyst projections (levels, not just ratios)**
- [2026-02-11] CBO's February 2026 Budget and Economic Outlook, the primary benchmark used by nearly all other forecasters, projects 
debt held by the public will grow by $25 trillion, from nearly $31 trillion today to $56 trillion by 2036, with debt as a share of GDP growing from 100% of GDP today to a record 108% by 2030 and 120% by 2036
. That implies debt held by the public near ~$32.5–33T by the end of calendar 2026 (consistent with the ~$32.4T held-by-public figure Treasury reported on Sept 17, 2026), which combined with ~$7.7–7.8T of intragovernmental holdings puts total (gross) debt on a trajectory of roughly $40.5–41T by Dec 31, 2026 if the FY2026 pace of borrowing (~$1.9T deficit, per CBO) continues. Congressional Budget Office, cbo.gov/publication/61882.
- [2026-02-27 basis, House Budget Committee plan cited by CBPP] An HBC-modeled path (using different, more optimistic policy assumptions) showed 
debt subject to the limit rising from the current $36.1 trillion to $37.7 trillion by the end of fiscal year (FY) 2025, $39.8 trillion by the end of FY 2026, and $41.8 trillion by the end of FY 2027
 — an earlier, lower-borrowing scenario than what has actually materialized (actual gross debt already exceeded $40T by August 2026, ahead of this schedule).
- [2026-05-07] CRFB's Debt Ceiling Q&A confirms the statutory ceiling itself: 
"The debt ceiling currently stands at $41.1 trillion, having been lifted to that level by the One Big Beautiful Bill Act (OBBBA)"
. This creates a hard ceiling on gross debt subject to limit near Dec 31, 2026, though Treasury has room below it currently.
- [2026-08-20] The National Taxpayers Union projects the debt limit binding constraint is not imminent within the question's window: 
"Based on projected borrowing needs, the federal government is likely to reach the $41.1 trillion debt limit by May 2027. The U.S. Department of the Treasury would be able to temporarily meet federal obligations for several months beyond this date by using incoming receipts, existing cash on hand, and extraordinary measures."
 This implies no debt-limit-driven cap on gross debt before Dec 31, 2026.
- [2026-09-20] Bipartisan Policy Center's tracking similarly implies no near-term binding constraint: 
"a Committee for a Responsible Federal Budget analysis of CBO's February 2026 baseline projections shows that the average interest rate paid on the national debt could exceed the economic growth rate starting in FY2031... a debt spiral"
 — a longer-run risk, not a 2026 constraint.

**Market/crowd-sourced forecast (Kalshi Citizen Debt Forecast)**
- [2026-09-05] Kalshi Research launched a "Citizen Debt Forecast" (CDF), a market-implied ten-year debt path built from Kalshi's GDP, Fed funds, and CPI markets, layered onto the CBO's fiscal baseline. Per Marginal Revolution's summary, 
"The CBO forecasts the future debt path but it updates only twice a year and is limited to a legislative baseline even when most observers expect, for example, taxes to increase or spending to be cut... The CDF updates continuously and can build in market expectations about future legislative changes,"
 and its projected 2036 debt/GDP path is "slightly more optimistic than the CBO forecast" — implying a similar or slightly lower debt trajectory than the official baseline for year-end 2026, though the CDF's own site frames the primary deficit input as fixed to CBO's baseline (2.2%), so near-term (2026) divergence from CBO is minimal.
- No standalone, liquid Kalshi (or other prediction-market) contract asking specifically "Will total debt be above $X trillion on Dec 31, 2026" could be found live; the only debt-level contract located was the now-settled "Above $38T at the end of 2025" market (settled Yes), suggesting markets have not yet built a granular Dec-2026 debt-level contract, or it is not indexed for search.

**Trend-based extrapolation from current Treasury data (context, not a forecast per se)**
- [2026-09-17] The most recent Debt to the Penny reading was 
"$40,093,343,468,150 on September 17, 2026"
, essentially flat over the prior two weeks (peaking at $40.176T on Aug 31 before dipping). Extrapolating the FY2026 average borrowing pace (~$1.9T/year per CBO, ≈$5.2B/day) forward ~105 days to Dec 31, 2026 implies a level in the $40.6–$41.0 trillion range, consistent with CBO's implicit path and comfortably below the $41.1T statutory ceiling.

**Track record note**
- Forecast accuracy has been directionally solid but has repeatedly underestimated near-term acceleration: CBO's January 2025 baseline did not anticipate the scale of the OBBBA's effect; its February 2026 update revised FY2026 deficit and debt-service costs upward, noting 
"The deficit for 2026 is $0.1 trillion (or 8 percent) more in CBO's current projections than it was in the agency's January 2025 projections... The 2025 reconciliation act (Public Law 119-21) and administrative actions related to immigration increased CBO's projections of deficits by $4.7 trillion and $0.5 trillion, respectively"
. This suggests point estimates tend to be revised upward over time, and any Dec-2026 forecast carries meaningful upside risk from legislation/tariff-revenue court rulings.

BOTTOM LINE: Official (CBO) and independent (CRFB, BPC) fiscal-forecasting bodies, plus a trend-line extrapolation of Treasury's own Debt-to-the-Penny data, converge on a Dec 31, 2026 total (gross) public debt level in roughly the $40.6–$41.0 trillion range — below the current $41.1 trillion statutory ceiling but a step up from the ~$40.1 trillion level recorded in mid-September 2026 — with essentially no analyst source projecting a debt-limit crisis or default disrupting that path before year-end.

NOT FOUND: A live, actively-traded prediction-market contract (Kalshi, Polymarket, or similar) with an explicit strike/threshold for "total US debt on Dec 31, 2026" and associated implied probabilities/consensus price; a specific point-estimate "consensus" figure from surveyed private-sector economists (e.g., Wall Street Journal or Bloomberg economist surveys) for the exact Dec 31, 2026 debt level; and a documented historical error/accuracy track record (e.g., RMSE) of CBO's short-horizon (within-year) debt-level projections specifically, as opposed to deficit or debt/GDP projections.

**Current trajectory and starting point**
- [2026-09-17] Total public debt outstanding stood at $40,093,343,468,150 (~$40.09T) per Treasury's Debt to the Penny dataset; debt held by the public was $32.39T and intragovernmental holdings $7.70T — https://www.indexbox.io/blog/us-public-debt-edges-lower-from-record-as-treasury-data-shows-mixed-components/
- [2026-08-31] Debt had peaked earlier at about $40.176 trillion before dipping in early September, showing the series is volatile week-to-week but on a rising multi-month path — https://www.indexbox.io/blog/us-total-public-debt-eases-from-record-as-public-holdings-edge-higher/

**Primary driver for a high-end (above-baseline) outcome: heavier Treasury borrowing**
- [2026-08-03] Treasury's official Marketable Borrowing Estimates state: 
"During the October–December 2026 quarter, Treasury expects to borrow $628 billion in privately-held net marketable debt, assuming an end-of-December cash balance of $850 billion."
 That single figure, added to intragovernmental changes, is the key upside lever — https://home.treasury.gov/news/press-releases/sb0584
- [2026-08-03] Treasury also raised its July–September 2026 quarter estimate to $739 billion, "$68 billion higher than announced in May 2026," driven by weaker net cash flows — an upward-revision pattern that, if it continues into Q4, would push debt above the baseline $40.7T-ish implied path — https://home.treasury.gov/news/press-releases/sb0584
- [2026-08-18] Detroit News reports the CBO's February baseline projected total FY2026 borrowing to "top out at $39.4 trillion," but revenue losses from invalidated tariffs pushed debt past $39.9T by mid-August, i.e., debt is already running well ahead of the CBO baseline — a pattern that, if it persists into Q4, points to a high-end outcome — https://www.detroitnews.com/story/news/politics/2026/08/18/us-debt-set-hit-40-trillion-months-earlier-than-expected/91350095007/

**Debt-limit ceiling as a potential upside cap or accelerant**
- [2026-09-09] Roll Call reports Lou Crandall of Wrightson ICAP projects the government could hit the $41.1 trillion debt limit "around February or March" 2027, implying debt could approach the ceiling by late 2026 if borrowing continues at the pace implied by Treasury's estimates — https://rollcall.com/2026/09/09/unsustainable-fiscal-path-debt-limit-fight-awaits-congress/
- [2026-09-09] Some Republicans have floated raising the debt limit "as soon as the post-election lame-duck session through budget reconciliation," which — if enacted before Dec 31 — would remove any statutory constraint on debt growth into year-end and support a higher print — https://rollcall.com/2026/09/09/unsustainable-fiscal-path-debt-limit-fight-awaits-congress/
- [2026-08-19] PBS News/BPC estimate places the limit-breach most likely between "late winter and mid-summer of 2027," suggesting the $41.1T statutory ceiling is unlikely to bind before Dec 31, 2026 under central assumptions — but a faster deficit blowout (tariff revenue shortfalls, new spending) could bring that forward — https://www.pbs.org/newshour/economy/the-u-s-national-debt-now-stands-at-40-trillion

**Fiscal/deficit pressures that could push toward the high end**
- CBO's February 2026 baseline (pre-tariff-ruling) projected: 
"The deficit for fiscal year 2026 is projected to be $1.9 trillion, equal to 5.8 percent of gross domestic product (GDP)."
 Actual FY2026 deficits are already running above this baseline due to lost tariff revenue.
- [2026-09-09] Roll Call notes 
"federal revenue has been coming in below expectations after the Supreme Court ruled that broad uses of the president's executive powers to levy tariffs were illegal,"
 a structural revenue shortfall that, if sustained through Q4, would push borrowing above Treasury's $628B Q4 estimate.
- The One Big Beautiful Bill Act's tax provisions and any further "reconciliation 3.0" spending expansions (mentioned as being discussed in Congress, not yet including the debt limit) could add to deficits if enacted before year-end, per Roll Call's September 9 report.

BOTTOM LINE: The high-scenario path to Dec 31, 2026 combines (1) Treasury's own $628B Q4 net marketable borrowing estimate layered on the ~$40.09–40.18T September level, (2) continued revenue underperformance from the invalidated tariffs pushing actual borrowing above official estimates (as already happened in FY2026, when debt hit $40T months earlier than the CBO's $39.4T full-year forecast), and (3) any lame-duck-session debt-limit increase or new spending legislation removing headroom constraints — together these could put year-end debt in the $40.7–41.1+ trillion range, potentially testing the $41.1T statutory ceiling itself.

NOT FOUND: No official Treasury or CBO point-estimate specifically for "national debt on December 31, 2026" was located (Treasury only publishes quarterly borrowing estimates, not exact debt-level forecasts); no confirmed legislative action (as of Sept 21, 2026) actually raising the $41.1T debt limit before Dec 31, 2026; no evidence of a new large emergency spending bill (e.g., disaster relief, war funding) enacted in Q4 2026 that would independently accelerate borrowing beyond Treasury's stated estimate.

**LOW SCENARIO — evidence-backed path to a Dec 31, 2026 debt figure near/below the bottom of the plausible range**

- [2026-09-17] The official Treasury "Debt to the Penny" dataset showed total public debt outstanding at $40,093,343,468,150 on Sept. 17, 2026, actually a decline of about $737 million from a prior record, and debt has oscillated in a narrow $40.05–$40.18 trillion band since late August rather than climbing steadily — evidence that near-term growth has plateaued rather than accelerated. https://www.indexbox.io/blog/us-public-debt-edges-lower-from-record-as-treasury-data-shows-mixed-components/

- [2026-09-09] 
CBO estimates that the August 2026 deficit totaled $168 billion – with $359 billion in revenue and $527 billion in outlays, $177 billion less than the $345 billion deficit in August 2025
, though CRFB notes this improvement is mostly a timing artifact, not a structural slowdown. https://www.crfb.org/blogs/12-month-rolling-deficit-18-trillion-august-2026

- [2026-09-09] 
The federal government borrowed $1.8 trillion over the past 12 months according to CBO estimates
, a run-rate that, if it held steady for the remaining ~3.5 months of the year, would put year-end debt meaningfully below trajectories implied by the FY2026 full-year deficit figure (which CBO separately projects at ~$2.1 trillion, inflated by tariff refunds). https://www.crfb.org/blogs/12-month-rolling-deficit-18-trillion-august-2026

- [2026-08-10] 
CBO's Monthly Budget Review projects the fiscal 2026 deficit will hit $2.1 trillion, up from $1.9 trillion forecast in February, with federal spending running close to its February baseline
 — meaning the upside deficit surprise is entirely revenue-driven (tariff losses), a factor that could reverse if tariff authority is restored, pulling the deficit (and thus debt growth) back down. https://fortune.com/2026/08/10/how-big-deficit-national-debt-tariffs-cbo/

- [2026-08-10] 
By July, the government was refunding more in tariffs than it collected, with roughly $100 billion refunded on duties collected under the invalidated IEEPA authority
 — a one-time drag on receipts (and thus a debt-increasing factor) that will not repeat indefinitely, meaning Q4 2026 net customs receipts could stabilize or improve relative to mid-2026, a mild downside risk to further debt growth.

- [2026-06-04/updated 2026-06-17] The statutory debt ceiling is $41.1 trillion, and 
the 2025 reconciliation bill increased the federal debt limit by $5 trillion, from $36.1 trillion to $41.1 trillion; since then, debt subject to the limit has increased by $2.9 trillion—consuming more than half of the increased borrowing authority
. https://bipartisanpolicy.org/article/when-will-we-reach-the-debt-limit-again/

- [2026-06-04] 
BPC estimates that, absent congressional action, the U.S. will most likely reach the debt limit once again sometime between late winter and mid-summer of 2027
 — implying the ceiling will NOT be breached before Dec 31, 2026, so a debt-limit-driven cap (which would be the strongest low-scenario mechanism, forcing Treasury into "extraordinary measures" that flatline reported debt) is unlikely to bind before year-end 2026, but slower-than-expected borrowing (e.g., due to Treasury deliberately husbanding cash) could still push the actual number toward the low end.

- [2026-06-04] 
More than $1 trillion in cash reserves would then allow the federal government to continue meeting obligations over a much longer period between reaching the limit and the X Date
, and BPC noted Treasury 
anticipates holding $950 billion on hand at the end of FY2026
-level cash reserves — high cash balances mean Treasury could, in principle, slow net new issuance late in the year without breaching obligations, a mechanism that could modestly restrain debt growth into December.

- [2025-Sept CRS] 
The debt limit was increased by $5.0 trillion, to $41.1 trillion, in July 2025 by P.L. 119-21
, and CRS separately notes 
recent projections suggest such borrowing will approach the debt limit sometime in FY2027, though such estimates are subject to considerable uncertainty
 — corroborating that a ceiling-driven hard stop before Dec 31, 2026 is not the expected path, but leaves open a low-probability tail where slower deficits push the "reach the limit" date out even further, keeping year-end 2026 debt below $41.1 trillion by a comfortable margin.

- [2026-07-16] Monthly CBO data show total FY2026 receipts running higher than FY2025 
the fiscal year 2026 federal budget deficit reached $1.4 trillion (through June), up from the $1.2 trillion estimate released for May; total receipts for the fiscal year hit $4.151 trillion, an increase of $142 billion compared to last year
 — stronger individual income/payroll tax collections are a genuine downside-to-debt-growth factor if sustained through Q4.

BOTTOM LINE: The low-scenario path is not a debt-ceiling breach (BPC/CRS both place that in FY2027, well after resolution) but a combination of (a) the actual daily Debt-to-the-Penny series plateauing/declining slightly in Sept 2026 around $40.05–$40.18T rather than accelerating, (b) stronger-than-baseline individual/payroll tax receipts, and (c) Treasury's large ($950B+) cash cushion allowing it to slow net issuance late in the year — together these could keep year-end 2026 debt closer to the low-to-mid $41 trillion range rather than the higher trajectories implied by the $2.1T FY2026 deficit estimate, though a sharp reversal is not evident in current data.

NOT FOUND: No Treasury or OMB estimate specifically for the projected debt level on Dec 31, 2026; no evidence of any policy action (spending cuts, DOGE savings, or restored tariff revenue) large enough to reduce the deficit meaningfully before year-end; no confirmed report of Treasury deliberately slowing bill issuance in Q4 2026.

10 AskNews articles (newest first; 6 from the last 48 h, 10 from the archive). Summaries are AskNews's own; dates are publication dates.

[2026-09-21] Cour des comptes Chief Warns of €100 Billion Debt Crisis by 2030
Europe 1 — https://www.europe1.fr/economie/budget-2027-amelie-de-montchalin-premiere-presidente-de-la-cour-des-comptes-appelle-a-agir-vite-face-au-poids-de-la-dette-1091234
  - Amélie de Montchalin, the First President of the Cour des comptes, has issued a warning regarding France's public finances ahead of the 2027 budget presentation on September 21, 2026.
  - De Montchalin, a key figure in the Macron administration until February 2026, states that debt interest costs are projected to reach nearly €80 billion this year and potentially €100 billion by 2030.
  - She asserts that 'each month of inaction aggravates financial asphyxiation' and warns that the crisis can be avoided only by reducing public spending or increasing taxes.
  - Additionally, the Ministry of Finance (Bercy) estimates that failing to pass a budget by December 31 would result in an additional cost of approximately €15 billion.
  - De Montchalin frames the issue as a matter of national sovereignty, noting that rising debt limits the government's ability to choose investment priorities.

[2026-09-21] 90% of Voters Fear National Debt Crisis Ahead of 2026 Midterms
Congress.net — https://congress.net/nine-in-ten-voters-fear-national-debt-crisis-as-2026-midterms-draw-near/
  - According to a sweeping bipartisan poll by the Peter G.
  - Peterson Foundation, 90% of voters are deeply concerned that the national debt is driving up inflation and everyday costs.
  - The national debt is now approaching $40 trillion, a figure described by experts and lawmakers as an urgent fiscal emergency.
  - The survey found that 85% of voters worry the debt is directly hiking borrowing costs for car loans, mortgages, and credit cards.
  - This concern is deeply personal, with 82% of voters saying a credible plan to address the national debt is a factor in their voting decisions for the 2026 election cycle.
  - This sentiment cuts across party lines: 84% of Democrats, 79% of independents, and 82% of Republicans cite the debt as a meaningful factor.
  - Furthermore, 73% of voters said they would consider supporting a candidate from a different party if that candidate had a clear debt reduction plan.
  - Despite this widespread alarm, experts caution that survey willingness differs from actual voting behavior, especially when other issues like housing, healthcare, immigration, and abortion are involved.
  - The annual federal deficit is projected to exceed $2 trillion in fiscal 2026, adding pressure on Treasury yields.
  - While some Republicans argue tariff revenues should be directed toward reducing the federal deficit, fiscal analysts expect only modest corrective measures from Washington this year, falling short of the structural reforms economists deem necessary.

[2026-09-21] Global Public Debt Hits New Record as US Burden Surpasses $40 Trillion
Handelsblatt — https://www.handelsblatt.com/finanzen/maerkte/anleihen/staatsstabilitaet-die-staatsverschuldung-steigt-rund-um-den-globus/100256066.html
  - According to a forecast by the OECD, public debt among leading industrial nations is projected to reach a new record in 2026, sparking concerns in the financial world.
  - The primary driver of this trend is the rapid rise in US debt, which surpassed the $40 trillion mark (approximately €34.87 trillion) in August.
  - Data from the US Treasury shows that since 2007, the debt of 38 OECD countries has tripled from $22.5 trillion to $61 trillion in 2025, with US liabilities rising from $9 trillion to $40 trillion during the same period.
  - This accumulation averages to over $6 billion in new debt per day for the US.
  - Björn Griesbach, head of capital market and macroeconomic research at Allianz Investment Management, described the debt dynamics in the US as 'concerning'.
  - Allianz, a major global investor with over €2 trillion in assets under management, highlighted the significance of this trend.

[2026-09-20] U.S. Voters Overwhelmingly Worry About $40 Trillion Debt Ahead of Midterms
Morningstar — https://www.morningstar.com/news/marketwatch/202609205/midterm-voters-are-overwhelmingly-worried-about-the-national-debt-but-only-small-fixes-are-expected-this-year
  - As the U.S. government's total debt topped $40 trillion last month and the borrowing ceiling stands at $41.1 trillion, midterm voters are expressing significant concern over the national debt's impact on their cost of living.
  - According to a new survey commissioned by the Peter G.
  - Peterson Foundation, 92% of registered voters are concerned about the debt, with 57% very concerned and 35% somewhat concerned; the survey indicates rising debt can increase inflation and interest rates.
  - Carolyn Bourdeaux, executive director at the Concord Coalition, and Marc Goldwein, senior vice president at the Committee for a Responsible Federal Budget, state that while the public lacks a perfect understanding of the link between deficits and the economy, they recognize the consequences, such as spending more on interest than on national defense.
  - A majority of voters (70%) believe candidates are not discussing the debt enough, and 95% say they would be more likely to support a candidate with a clear debt plan.
  - However, major legislative fixes are not expected before the Nov. 3 elections, with only small steps anticipated during the 'lame-duck session' from after the midterms to early January.
  - During this period, the Republican-controlled House and GOP-run Senate are expected to work with the Trump White House to raise the U.S. debt limit, potentially including provisions for a fiscal commission.
  - The Bipartisan Policy Center estimates Washington will hit the debt limit between late winter and mid-summer.
  - Treasury Secretary Scott Bessent previously promised a new debt plan within days but later delayed it to 'coming weeks or months,' while the Trump administration has yet to release a traditional budget proposal.
  - Goldwein noted that gross national debt has doubled in a decade, hitting 'rock bottom' around 2020 and 2021 with massive COVID relief bills, but suggests the country is now on a 'rebound.'.

[2026-09-20] Tanous: VAT is the only solution to $40 trillion U.S. debt (opinion)
The Hill — https://thehill.com/opinion/finance/6099509-us-debt-vat-solution/
  - Peter J.
  - Tanous, chairman emeritus at Lynx Investment Advisory, argues in an opinion piece published in The Hill that the U.S. national debt, which has reached $40 trillion, cannot be solved by spending cuts alone.
  - According to Tanous, mandatory spending accounts for $5.6 trillion (73 percent) of the roughly $7.7 trillion in total federal spending for fiscal 2026, leaving no viable path to close the deficit through cost-cutting.
  - He proposes a value-added tax (VAT) as the only credible solution.
  - Tanous notes that the Congressional Budget Office scores a 5 percent VAT at raising $350 billion in 2027, rising to $440 billion by 2034, while a 10 percent rate proposed by the author could cut the primary deficit by approximately $1.6 trillion annually.
  - The article highlights that the average VAT rate in Europe is 21 percent, suggesting a 10 percent U.S. rate would be significantly lower.
  - Tanous warns that failing to act could lead to a financial crisis 'that would dwarf 2008-2009' and suggests mitigating the tax's regressive nature by exempting necessities and implementing rebates similar to Canada's GST credit.

[2026-09-20] US Debt Hits $40 Trillion Amidst 'Doom Loop' and Rising Interest Costs (opinion)
Activist Post — https://activistpost.com/doom-loop-engaged-us-debt-hits-40-trillion-as-treasury-enters-the-endgame/
  - On September 20, 2026, the US Treasury announced that total public debt surpassed $40 trillion for the first time, having jumped by over $60 billion in a single day and surged by $1 trillion in just over three months, according to Activist Post.
  - Treasury Secretary Scott Bessent announced a market intervention two weeks prior to ramp up liquidity support for longer-dated securities, aiming to rein in borrowing costs, though yields had previously surged.
  - The debt grew from $30 trillion in January 2022 to $40 trillion in less than five years, a pace driven by historically wide fiscal deficits and a lack of action from US lawmakers, as both Republicans and Democrats avoid tax increases or cuts to healthcare and retirement benefits.
  - Interest costs have become the third-largest part of the budget at $1.37 trillion for the first half of 2026, a 20% increase year-over-year, and are projected to surpass Social Security ($1.6 trillion) no later than 2026.
  - Matthew Luzzetti of Deutsche Bank AG noted that while the $40 trillion threshold focuses attention, it does not change debt dynamics, whereas the climb in Treasury yields is increasing the cost of servicing the debt.
  - The article describes a 'doom loop' where higher interest costs fuel more borrowing, potentially exacerbated by an 'AI debt bubble' crowding out demand for US paper.
  - With the debt ceiling at $41.1 trillion, the government is estimated to have only 4 to 5 months before another potential default showdown.
  - Fitch Ratings reaffirmed the US credit rating at AA+ but warned the country is 'vulnerable to future economic shocks' due to spending pressures from an aging population.
  - Meanwhile, President Donald Trump is reportedly seeking new tax-cut promises and increased defense spending ahead of the November midterm elections, and the Elon Musk-led Department of Government Efficiency failed to cut outlays as projected.

[2026-08-20] US National Debt Hits $40 Trillion: $1.4T Annual Interest and Path to $42T by Year-End (analysis)
Investing.com — https://www.investing.com/news/stock-market-news/40-trillion-in-debt-dont-worry--we-cant-afford-to-fix-it-either-93CH-4869241
  - On Tuesday, August 18, 2026, the United States crossed the $40 trillion national debt threshold, reaching $40.047 trillion, a milestone that triggered a brief bond selloff and a market intervention by Treasury Secretary Scott Bessent, who doubled 30-year Treasury buyback operations to a minimum of $4 billion per operation.
  - According to BofA strategist Michael Hartnett, trailing 12-month debt servicing costs stand at $1.4 trillion, translating to approximately $116.7 billion in monthly interest and $3.84 billion in daily interest burn.
  - Hartnett projects the national debt could reach $50 trillion by 2029, implying a daily accrual of roughly $8.05 billion.
  - From August 20, 2026, with 133 days remaining until year-end, linear extrapolation suggests the debt will reach between $40.78 trillion (conservative) and $41.38 trillion (aggressive), making the $42 trillion target by December 31, 2026 unlikely without an extraordinary fiscal shock requiring a daily accrual of ~$14.7 billion.
  - The 30-year Treasury yield surged to 5.19% post-intervention, while the article notes that debt servicing is now the single largest line item in the federal budget.
  - The analysis highlights that the U.S. government is effectively acting as a lender of last resort to itself, with every 25 basis points in rate increases adding approximately $100 billion to the annual interest burden.

[2026-08-07] U.S. National Debt Hits $39.83 Trillion, Projected to Reach $40 Trillion by August 31, 2026
jec.senate.gov — https://www.jec.senate.gov/public/index.cfm/republicans/newsroom
  - The Joint Economic Committee released its Monthly Debt Update on August 7, 2026, reporting that total gross national debt reached $39.83 trillion.
  - Relative to one year prior, debt increased by $2.88 trillion, and relative to five years ago, it rose by $11.40 trillion.
  - The debt grew at an average rate of $91,549.43 per second over the past year, amounting to $8,420.07 per person or $21,360.58 per household in annual increases.
  - Current debt totals $116,480 per person and $295,494 per household.
  - Projections based on the average daily growth rate over the past three years indicate the U.S. will reach $40 trillion by approximately August 31, 2026, with an additional trillion expected in about 152 days.
  - As of July 2026, the average interest rate on marketable national debt was 3.443 percent, up from 3.399 percent one year ago and 1.476 percent five years ago.
  - Interest payments to trust funds totaled $302.64 billion over the past 12 months, averaging $25.22 billion per month.
  - The Congressional Budget Office forecasts net interest as a share of outlays to be 13.95 percent in FY2026, 14.25 percent in FY2027, and 14.94 percent in FY2028.

[2026-05-01] US National Debt Surpasses GDP for First Time Since WWII
NTV — https://www.ntv.com.tr/ntvpara/abdnin-ulusal-borcu-ekonominin-buyuklugunu-asti-1722362
  - According to new data from the Committee for a Responsible Federal Budget (CRFB), the US national debt has surpassed the size of the economy for the first time since World War II.
  - As of March 31, 2026, public debt reached $31.27 trillion, while nominal GDP for the preceding 12 months was estimated at $31.22 trillion, meaning the debt-to-GDP ratio hit 100.2%.
  - CRFB President Maya MacGuineas stated that the national debt is now larger than the US economy and approximately double the historical average, calling it a 'strong alarm.' She noted that unlike the post-WWII peak of 106% debt-to-GDP, the current rise stems from both parties delaying difficult fiscal decisions rather than a global war.
  - MacGuineas warned that high debt slows income growth, raises interest rates, and increases inflationary pressure, recommending a $10 trillion budget deficit reduction to restore stability.
  - Fitch Ratings also highlighted that widening deficits and rising debt pose a fundamental challenge to the US credit rating, noting that structural deficits are pushing the US debt burden significantly higher than other 'AA' rated countries.
  - The report added that the fiscal outlook is expected to worsen by 2026 due to tax cut legislation, though revenue from tariffs may offset about half of this impact.
  - Additionally, the US gross debt, including government internal obligations, stands at approximately $39 trillion.

[2026-05-01] US National Debt Surpasses Economy Size
РИА Новости — https://ria.ru/20260501/ssha-2090065942.html
  - According to estimates from the US Bureau of Economic Analysis cited by Fox Business, US federal debt reached approximately $31.27 trillion as of March 31, 2026.
  - This figure surpassed the US Gross Domestic Product (GDP) for the same period, which was valued at $31.22 trillion, meaning the national debt exceeded 100% of the US economy.

## Tool outputs

### resolution_source (SUCCESS)
RESOLUTION SOURCE (the page the question resolves on — treat as the status-quo anchor):
  Current state: As of 9/17/2026, the national debt (Total Public Debt Outstanding, per Debt to the Penny/Fox Business tracker) stood at $40,094,080,427,790.97, up from just over $38.5 trillion at end of 2025. The question asks for the value on 12/31/2026, which has not yet occurred.
  Last updated: 09/18/2026 (Debt to the Penny dataset); 09/17/2026 (Fox Business figure) | already resolved: no | page matches criteria: True
  Note: The official resolution source is the Debt to the Penny dataset, which currently only has data through 09/17/2026; December 31, 2026 data does not yet exist. The Fox Business tracker cites the same underlying Treasury data. Any forecast for 12/31/2026 must be an extrapolation, not a confirmed figure.
  Fetched: https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny (HTTP 200)
  Fetched: https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny#introduction (HTTP 200)
  Fetched: https://www.foxbusiness.com/economy/us-national-debt-tracker (HTTP 200)

### fred_data (SUCCESS)
FRED macroeconomic data:
  GFDEBTN: 39065421.0000 (as of 2026-01-01, YoY change: +6733147.0000)
  MTSDS133FMS: -166796.9523 (as of 2026-08-01, YoY change: -364746.5826)
  FYFSD: -1774684.0000 (as of 2025-09-30)
  WTREGEN: 877028.0000 (as of 2026-09-16, YoY change: -3209.0000)

### web_search (SUCCESS)
Web search summary (20 results):
Here's a comprehensive summary of findings for each query:

## 1. Treasury Quarterly Refunding (August 2026) – Marketable Borrowing Estimates

**Key facts (announced August 3, 2026):**
- For the **October–December 2026 quarter**: 
Treasury expects to borrow $628 billion in privately-held net marketable debt, assuming an end-of-December cash balance of $850 billion.

- For the **July–September 2026 quarter**: 
Treasury expects to borrow $739 billion in privately-held net marketable debt, assuming an end-of-September cash balance of $950 billion.

- 
The Q3 borrowing estimate is $68 billion higher than announced in May 2026, primarily due to lower projected net cash flows, partially offset by the higher-than-assumed beginning-of-quarter cash balance; excluding that cash balance effect, the current quarter estimate is $87 billion higher than announced in May.

- For the prior **April–June 2026 quarter** (actuals): 
Treasury borrowed $190 billion in privately-held net marketable debt and ended the quarter with a cash balance of $919 billion.
 
In May 2026, Treasury had estimated borrowing of $189 billion and assumed an end-of-June cash balance of $900 billion; the $1 billion difference resulted primarily from the higher-than-assumed end-of-quarter cash balance, partially offset by higher net cash flows.

- 
Additional financing details relating to Treasury's Quarterly Refunding were released at 8:30 a.m. on Wednesday, August 5, 2026.

- A related TBAC presentation noted assumptions of 
end-of-September 2026 and end-of-December 2026 cash balances of $950 billion and $850 billion, respectively, versus an end-of-June 2026 cash balance of $919 billion.


**Source:** U.S. Treasury press release (home.treasury.gov/news/press-releases/sb0584), dated August 3, 2026; Treasury Presentation to TBAC (home.treasury.gov/system/files/221/TreasuryPresentationToTBACQ32026.pdf).

---

## 2. Debt to the Penny – Total Public Debt Outstanding (September 2026)

**Key facts:**
- As of **September 17, 2026**: 
total US public debt outstanding stood at $40,093,343,468,150, a $736,959,641 decline from the prior record, with debt held by the public lower and intragovernmental holdings higher.
 
Debt held by the public was $32,392,786,557,372, while intragovernmental holdings were $7,700,556,910,778.

- On **September 16, 2026**: 
total public debt outstanding stood at $40,094,080,427,791, a decline of $20,365,263,376 from the prior record level.

- The debt trajectory through September showed fluctuation: 
on Aug. 31, 2026, total public debt outstanding was about $40.176 trillion, with debt held by the public near $32.415 trillion and intragovernmental holdings around $7.761 trillion
 — the record peak — before declining in early September. By 
September 8, 2026, total public debt outstanding stood at $40.084 trillion, a decrease of $10.5 billion from the previous record
, and by September 9 it was 
about $40.074 trillion, down roughly $9.806 billion from its record
.
- Notabl

### code_execution (SUCCESS)
Code execution (Linear extrapolation of debt from figures in the question ($38.5T on 2025-12-31, ~$40T by mid-Aug 2026, ~$6B/day) to 2026-12-31 under a range of daily accrual rates):
  Output:
  implied $/day Jan-midAug: 6.607929515418502 B; days remaining after mid-Aug: 138
rate 4B/day -> Dec31 debt 40.55T
rate 5B/day -> Dec31 debt 40.69T
rate 6B/day -> Dec31 debt 40.83T
rate 7B/day -> Dec31 debt 40.97T
rate 8B/day -> Dec31 debt 41.10T
rate 9B/day -> Dec31 debt 41.24T
full-year at implied rate: 40.91189427312775
CY growth 2.0T -> 40.50T
CY growth 2.2T -> 40.70T
CY growth 2.4T -> 40.90T
CY growth 2.6T -> 41.10T

You are an elite superforecaster. Produce a probability distribution over the answer to this Metaculus numeric question.

## Question
What will be the US national debt on December 31, 2026?

## Description / Resolution Criteria
## Description
The [national debt of the United States](https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny#introduction) is the debt, or unpaid borrowed funds, carried by the federal government of the United States, which is measured by intra-governmental holdings and debt held by the public, including securities issued by the U.S. Treasury. The U.S. national debt has been [climbing at a rapid pace](https://www.foxbusiness.com/economy/us-national-debt-tracker) for years.

At the end of 2025, [the national debt](https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny#introduction) stood at just over \$38.5 trillion. By mid-August 2026, the figure had reached [over \$40 trillion](https://apnews.com/article/treasury-national-debt-limit-a27a8d3651ff810b25c610d3e1b6259d), equivalent to about a 4% increase, and over \$6 billion per day during 2026.

## Resolution Criteria
This question will resolve as the "Total Public Debt Outstanding" on December 31, 2026, according to the official [Debt to the Penny dataset](https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny).

## Range
The question's displayed range is [40500000000000, 42500000000000] (units: $).
The LOWER bound is OPEN: outcomes below 40500000000000 are possible and resolve as "below range".
The UPPER bound is OPEN: outcomes above 42500000000000 are possible and resolve as "above range".
Where a bound is open, your percentiles MAY lie outside the displayed range — the range is where the question author expects most of the mass, not a constraint on the answer. Do not compress your distribution to fit inside it.

## Research tool outputs (raw; the resolution-source read is the status-quo anchor)
## Tool outputs

### resolution_source (SUCCESS)
RESOLUTION SOURCE (the page the question resolves on — treat as the status-quo anchor):
  Current state: As of 9/17/2026, the national debt (Total Public Debt Outstanding, per Debt to the Penny/Fox Business tracker) stood at $40,094,080,427,790.97, up from just over $38.5 trillion at end of 2025. The question asks for the value on 12/31/2026, which has not yet occurred.
  Last updated: 09/18/2026 (Debt to the Penny dataset); 09/17/2026 (Fox Business figure) | already resolved: no | page matches criteria: True
  Note: The official resolution source is the Debt to the Penny dataset, which currently only has data through 09/17/2026; December 31, 2026 data does not yet exist. The Fox Business tracker cites the same underlying Treasury data. Any forecast for 12/31/2026 must be an extrapolation, not a confirmed figure.
  Fetched: https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny (HTTP 200)
  Fetched: https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny#introduction (HTTP 200)
  Fetched: https://www.foxbusiness.com/economy/us-national-debt-tracker (HTTP 200)

### fred_data (SUCCESS)
FRED macroeconomic data:
  GFDEBTN: 39065421.0000 (as of 2026-01-01, YoY change: +6733147.0000)
  MTSDS133FMS: -166796.9523 (as of 2026-08-01, YoY change: -364746.5826)
  FYFSD: -1774684.0000 (as of 2025-09-30)
  WTREGEN: 877028.0000 (as of 2026-09-16, YoY change: -3209.0000)

### web_search (SUCCESS)
Web search summary (20 results):
Here's a comprehensive summary of findings for each query:

## 1. Treasury Quarterly Refunding (August 2026) – Marketable Borrowing Estimates

**Key facts (announced August 3, 2026):**
- For the **October–December 2026 quarter**: 
Treasury expects to borrow $628 billion in privately-held net marketable debt, assuming an end-of-December cash balance of $850 billion.

- For the **July–September 2026 quarter**: 
Treasury expects to borrow $739 billion in privately-held net marketable debt, assuming an end-of-September cash balance of $950 billion.

- 
The Q3 borrowing estimate is $68 billion higher than announced in May 2026, primarily due to lower projected net cash flows, partially offset by the higher-than-assumed beginning-of-quarter cash balance; excluding that cash balance effect, the current quarter estimate is $87 billion higher than announced in May.

- For the prior **April–June 2026 quarter** (actuals): 
Treasury borrowed $190 billion in privately-held net marketable debt and ended the quarter with a cash balance of $919 billion.
 
In May 2026, Treasury had estimated borrowing of $189 billion and assumed an end-of-June cash balance of $900 billion; the $1 billion difference resulted primarily from the higher-than-assumed end-of-quarter cash balance, partially offset by higher net cash flows.

- 
Additional financing details relating to Treasury's Quarterly Refunding were released at 8:30 a.m. on Wednesday, August 5, 2026.

- A related TBAC presentation noted assumptions of 
end-of-September 2026 and end-of-December 2026 cash balances of $950 billion and $850 billion, respectively, versus an end-of-June 2026 cash balance of $919 billion.


**Source:** U.S. Treasury press release (home.treasury.gov/news/press-releases/sb0584), dated August 3, 2026; Treasury Presentation to TBAC (home.treasury.gov/system/files/221/TreasuryPresentationToTBACQ32026.pdf).

---

## 2. Debt to the Penny – Total Public Debt Outstanding (September 2026)

**Key facts:**
- As of **September 17, 2026**: 
total US public debt outstanding stood at $40,093,343,468,150, a $736,959,641 decline from the prior record, with debt held by the public lower and intragovernmental holdings higher.
 
Debt held by the public was $32,392,786,557,372, while intragovernmental holdings were $7,700,556,910,778.

- On **September 16, 2026**: 
total public debt outstanding stood at $40,094,080,427,791, a decline of $20,365,263,376 from the prior record level.

- The debt trajectory through September showed fluctuation: 
on Aug. 31, 2026, total public debt outstanding was about $40.176 trillion, with debt held by the public near $32.415 trillion and intragovernmental holdings around $7.761 trillion
 — the record peak — before declining in early September. By 
September 8, 2026, total public debt outstanding stood at $40.084 trillion, a decrease of $10.5 billion from the previous record
, and by September 9 it was 
about $40.074 trillion, down roughly $9.806 billion from its record
.
- Notabl

### code_execution (SUCCESS)
Code execution (Linear extrapolation of debt from figures in the question ($38.5T on 2025-12-31, ~$40T by mid-Aug 2026, ~$6B/day) to 2026-12-31 under a range of daily accrual rates):
  Output:
  implied $/day Jan-midAug: 6.607929515418502 B; days remaining after mid-Aug: 138
rate 4B/day -> Dec31 debt 40.55T
rate 5B/day -> Dec31 debt 40.69T
rate 6B/day -> Dec31 debt 40.83T
rate 7B/day -> Dec31 debt 40.97T
rate 8B/day -> Dec31 debt 41.10T
rate 9B/day -> Dec31 debt 41.24T
full-year at implied rate: 40.91189427312775
CY growth 2.0T -> 40.50T
CY growth 2.2T -> 40.70T
CY growth 2.4T -> 40.90T
CY growth 2.6T -> 41.10T

## Question dates and conventions
Dates: opened 2026-09-21; forecasting closes 2026-11-30; resolves 2026-12-31. Only events AFTER the open date can satisfy the criteria; assume the event has NOT happened unless a source shows it has. A question phrased 'before <date>' or 'by <date>' asks whether it happens between now and that date. The deadline for the outcome is the RESOLUTION date, not the close date.

## Recent news (AskNews, raw article summaries, newest first — read these directly)
10 AskNews articles (newest first; 6 from the last 48 h, 10 from the archive). Summaries are AskNews's own; dates are publication dates.

[2026-09-21] Cour des comptes Chief Warns of €100 Billion Debt Crisis by 2030
Europe 1 — https://www.europe1.fr/economie/budget-2027-amelie-de-montchalin-premiere-presidente-de-la-cour-des-comptes-appelle-a-agir-vite-face-au-poids-de-la-dette-1091234
  - Amélie de Montchalin, the First President of the Cour des comptes, has issued a warning regarding France's public finances ahead of the 2027 budget presentation on September 21, 2026.
  - De Montchalin, a key figure in the Macron administration until February 2026, states that debt interest costs are projected to reach nearly €80 billion this year and potentially €100 billion by 2030.
  - She asserts that 'each month of inaction aggravates financial asphyxiation' and warns that the crisis can be avoided only by reducing public spending or increasing taxes.
  - Additionally, the Ministry of Finance (Bercy) estimates that failing to pass a budget by December 31 would result in an additional cost of approximately €15 billion.
  - De Montchalin frames the issue as a matter of national sovereignty, noting that rising debt limits the government's ability to choose investment priorities.

[2026-09-21] 90% of Voters Fear National Debt Crisis Ahead of 2026 Midterms
Congress.net — https://congress.net/nine-in-ten-voters-fear-national-debt-crisis-as-2026-midterms-draw-near/
  - According to a sweeping bipartisan poll by the Peter G.
  - Peterson Foundation, 90% of voters are deeply concerned that the national debt is driving up inflation and everyday costs.
  - The national debt is now approaching $40 trillion, a figure described by experts and lawmakers as an urgent fiscal emergency.
  - The survey found that 85% of voters worry the debt is directly hiking borrowing costs for car loans, mortgages, and credit cards.
  - This concern is deeply personal, with 82% of voters saying a credible plan to address the national debt is a factor in their voting decisions for the 2026 election cycle.
  - This sentiment cuts across party lines: 84% of Democrats, 79% of independents, and 82% of Republicans cite the debt as a meaningful factor.
  - Furthermore, 73% of voters said they would consider supporting a candidate from a different party if that candidate had a clear debt reduction plan.
  - Despite this widespread alarm, experts caution that survey willingness differs from actual voting behavior, especially when other issues like housing, healthcare, immigration, and abortion are involved.
  - The annual federal deficit is projected to exceed $2 trillion in fiscal 2026, adding pressure on Treasury yields.
  - While some Republicans argue tariff revenues should be directed toward reducing the federal deficit, fiscal analysts expect only modest corrective measures from Washington this year, falling short of the structural reforms economists deem necessary.

[2026-09-21] Global Public Debt Hits New Record as US Burden Surpasses $40 Trillion
Handelsblatt — https://www.handelsblatt.com/finanzen/maerkte/anleihen/staatsstabilitaet-die-staatsverschuldung-steigt-rund-um-den-globus/100256066.html
  - According to a forecast by the OECD, public debt among leading industrial nations is projected to reach a new record in 2026, sparking concerns in the financial world.
  - The primary driver of this trend is the rapid rise in US debt, which surpassed the $40 trillion mark (approximately €34.87 trillion) in August.
  - Data from the US Treasury shows that since 2007, the debt of 38 OECD countries has tripled from $22.5 trillion to $61 trillion in 2025, with US liabilities rising from $9 trillion to $40 trillion during the same period.
  - This accumulation averages to over $6 billion in new debt per day for the US.
  - Björn Griesbach, head of capital market and macroeconomic research at Allianz Investment Management, described the debt dynamics in the US as 'concerning'.
  - Allianz, a major global investor with over €2 trillion in assets under management, highlighted the significance of this trend.

[2026-09-20] U.S. Voters Overwhelmingly Worry About $40 Trillion Debt Ahead of Midterms
Morningstar — https://www.morningstar.com/news/marketwatch/202609205/midterm-voters-are-overwhelmingly-worried-about-the-national-debt-but-only-small-fixes-are-expected-this-year
  - As the U.S. government's total debt topped $40 trillion last month and the borrowing ceiling stands at $41.1 trillion, midterm voters are expressing significant concern over the national debt's impact on their cost of living.
  - According to a new survey commissioned by the Peter G.
  - Peterson Foundation, 92% of registered voters are concerned about the debt, with 57% very concerned and 35% somewhat concerned; the survey indicates rising debt can increase inflation and interest rates.
  - Carolyn Bourdeaux, executive director at the Concord Coalition, and Marc Goldwein, senior vice president at the Committee for a Responsible Federal Budget, state that while the public lacks a perfect understanding of the link between deficits and the economy, they recognize the consequences, such as spending more on interest than on national defense.
  - A majority of voters (70%) believe candidates are not discussing the debt enough, and 95% say they would be more likely to support a candidate with a clear debt plan.
  - However, major legislative fixes are not expected before the Nov. 3 elections, with only small steps anticipated during the 'lame-duck session' from after the midterms to early January.
  - During this period, the Republican-controlled House and GOP-run Senate are expected to work with the Trump White House to raise the U.S. debt limit, potentially including provisions for a fiscal commission.
  - The Bipartisan Policy Center estimates Washington will hit the debt limit between late winter and mid-summer.
  - Treasury Secretary Scott Bessent previously promised a new debt plan within days but later delayed it to 'coming weeks or months,' while the Trump administration has yet to release a traditional budget proposal.
  - Goldwein noted that gross national debt has doubled in a decade, hitting 'rock bottom' around 2020 and 2021 with massive COVID relief bills, but suggests the country is now on a 'rebound.'.

[2026-09-20] Tanous: VAT is the only solution to $40 trillion U.S. debt (opinion)
The Hill — https://thehill.com/opinion/finance/6099509-us-debt-vat-solution/
  - Peter J.
  - Tanous, chairman emeritus at Lynx Investment Advisory, argues in an opinion piece published in The Hill that the U.S. national debt, which has reached $40 trillion, cannot be solved by spending cuts alone.
  - According to Tanous, mandatory spending accounts for $5.6 trillion (73 percent) of the roughly $7.7 trillion in total federal spending for fiscal 2026, leaving no viable path to close the deficit through cost-cutting.
  - He proposes a value-added tax (VAT) as the only credible solution.
  - Tanous notes that the Congressional Budget Office scores a 5 percent VAT at raising $350 billion in 2027, rising to $440 billion by 2034, while a 10 percent rate proposed by the author could cut the primary deficit by approximately $1.6 trillion annually.
  - The article highlights that the average VAT rate in Europe is 21 percent, suggesting a 10 percent U.S. rate would be significantly lower.
  - Tanous warns that failing to act could lead to a financial crisis 'that would dwarf 2008-2009' and suggests mitigating the tax's regressive nature by exempting necessities and implementing rebates similar to Canada's GST credit.

[2026-09-20] US Debt Hits $40 Trillion Amidst 'Doom Loop' and Rising Interest Costs (opinion)
Activist Post — https://activistpost.com/doom-loop-engaged-us-debt-hits-40-trillion-as-treasury-enters-the-endgame/
  - On September 20, 2026, the US Treasury announced that total public debt surpassed $40 trillion for the first time, having jumped by over $60 billion in a single day and surged by $1 trillion in just over three months, according to Activist Post.
  - Treasury Secretary Scott Bessent announced a market intervention two weeks prior to ramp up liquidity support for longer-dated securities, aiming to rein in borrowing costs, though yields had previously surged.
  - The debt grew from $30 trillion in January 2022 to $40 trillion in less than five years, a pace driven by historically wide fiscal deficits and a lack of action from US lawmakers, as both Republicans and Democrats avoid tax increases or cuts to healthcare and retirement benefits.
  - Interest costs have become the third-largest part of the budget at $1.37 trillion for the first half of 2026, a 20% increase year-over-year, and are projected to surpass Social Security ($1.6 trillion) no later than 2026.
  - Matthew Luzzetti of Deutsche Bank AG noted that while the $40 trillion threshold focuses attention, it does not change debt dynamics, whereas the climb in Treasury yields is increasing the cost of servicing the debt.
  - The article describes a 'doom loop' where higher interest costs fuel more borrowing, potentially exacerbated by an 'AI debt bubble' crowding out demand for US paper.
  - With the debt ceiling at $41.1 trillion, the government is estimated to have only 4 to 5 months before another potential default showdown.
  - Fitch Ratings reaffirmed the US credit rating at AA+ but warned the country is 'vulnerable to future economic shocks' due to spending pressures from an aging population.
  - Meanwhile, President Donald Trump is reportedly seeking new tax-cut promises and increased defense spending ahead of the November midterm elections, and the Elon Musk-led Department of Government Efficiency failed to cut outlays as projected.

[2026-08-20] US National Debt Hits $40 Trillion: $1.4T Annual Interest and Path to $42T by Year-End (analysis)
Investing.com — https://www.investing.com/news/stock-market-news/40-trillion-in-debt-dont-worry--we-cant-afford-to-fix-it-either-93CH-4869241
  - On Tuesday, August 18, 2026, the United States crossed the $40 trillion national debt threshold, reaching $40.047 trillion, a milestone that triggered a brief bond selloff and a market intervention by Treasury Secretary Scott Bessent, who doubled 30-year Treasury buyback operations to a minimum of $4 billion per operation.
  - According to BofA strategist Michael Hartnett, trailing 12-month debt servicing costs stand at $1.4 trillion, translating to approximately $116.7 billion in monthly interest and $3.84 billion in daily interest burn.
  - Hartnett projects the national debt could reach $50 trillion by 2029, implying a daily accrual of roughly $8.05 billion.
  - From August 20, 2026, with 133 days remaining until year-end, linear extrapolation suggests the debt will reach between $40.78 trillion (conservative) and $41.38 trillion (aggressive), making the $42 trillion target by December 31, 2026 unlikely without an extraordinary fiscal shock requiring a daily accrual of ~$14.7 billion.
  - The 30-year Treasury yield surged to 5.19% post-intervention, while the article notes that debt servicing is now the single largest line item in the federal budget.
  - The analysis highlights that the U.S. government is effectively acting as a lender of last resort to itself, with every 25 basis points in rate increases adding approximately $100 billion to the annual interest burden.

[2026-08-07] U.S. National Debt Hits $39.83 Trillion, Projected to Reach $40 Trillion by August 31, 2026
jec.senate.gov — https://www.jec.senate.gov/public/index.cfm/republicans/newsroom
  - The Joint Economic Committee released its Monthly Debt Update on August 7, 2026, reporting that total gross national debt reached $39.83 trillion.
  - Relative to one year prior, debt increased by $2.88 trillion, and relative to five years ago, it rose by $11.40 trillion.
  - The debt grew at an average rate of $91,549.43 per second over the past year, amounting to $8,420.07 per person or $21,360.58 per household in annual increases.
  - Current debt totals $116,480 per person and $295,494 per household.
  - Projections based on the average daily growth rate over the past three years indicate the U.S. will reach $40 trillion by approximately August 31, 2026, with an additional trillion expected in about 152 days.
  - As of July 2026, the average interest rate on marketable national debt was 3.443 percent, up from 3.399 percent one year ago and 1.476 percent five years ago.
  - Interest payments to trust funds totaled $302.64 billion over the past 12 months, averaging $25.22 billion per month.
  - The Congressional Budget Office forecasts net interest as a share of outlays to be 13.95 percent in FY2026, 14.25 percent in FY2027, and 14.94 percent in FY2028.

[2026-05-01] US National Debt Surpasses GDP for First Time Since WWII
NTV — https://www.ntv.com.tr/ntvpara/abdnin-ulusal-borcu-ekonominin-buyuklugunu-asti-1722362
  - According to new data from the Committee for a Responsible Federal Budget (CRFB), the US national debt has surpassed the size of the economy for the first time since World War II.
  - As of March 31, 2026, public debt reached $31.27 trillion, while nominal GDP for the preceding 12 months was estimated at $31.22 trillion, meaning the debt-to-GDP ratio hit 100.2%.
  - CRFB President Maya MacGuineas stated that the national debt is now larger than the US economy and approximately double the historical average, calling it a 'strong alarm.' She noted that unlike the post-WWII peak of 106% debt-to-GDP, the current rise stems from both parties delaying difficult fiscal decisions rather than a global war.
  - MacGuineas warned that high debt slows income growth, raises interest rates, and increases inflationary pressure, recommending a $10 trillion budget deficit reduction to restore stability.
  - Fitch Ratings also highlighted that widening deficits and rising debt pose a fundamental challenge to the US credit rating, noting that structural deficits are pushing the US debt burden significantly higher than other 'AA' rated countries.
  - The report added that the fiscal outlook is expected to worsen by 2026 due to tax cut legislation, though revenue from tariffs may offset about half of this impact.
  - Additionally, the US gross debt, including government internal obligations, stands at approximately $39 trillion.

[2026-05-01] US National Debt Surpasses Economy Size
РИА Новости — https://ria.ru/20260501/ssha-2090065942.html
  - According to estimates from the US Bureau of Economic Analysis cited by Fox Business, US federal debt reached approximately $31.27 trillion as of March 31, 2026.
  - This figure surpassed the US Gross Domestic Product (GDP) for the same period, which was valued at $31.22 trillion, meaning the national debt exceeded 100% of the US economy.

## Research reports (one per dimension: web search + page reads, dated, with sources)
### CURRENT STATE
- [2026-09-17] Treasury's Debt to the Penny primary dataset (via Fiscal Data, last confirmed by secondary aggregator) showed total public debt outstanding at $40,093,343,468,150 on September 17, 2026, essentially flat versus the prior week, with debt held by the public at $32.39T and intragovernmental holdings at $7.70T. https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny

- [2026-09-18] The Debt to the Penny series shows the total has traded in a narrow $40.03–$40.18 trillion band since mid-August, moving from $39.89T on Aug 7 to a peak of $40.176T on Aug 31, then oscillating around $40.05–40.12T through mid-September rather than climbing steadily. https://www.indexbox.io/blog/us-public-debt-edges-lower-from-record-as-treasury-data-shows-mixed-components/

- [2026-08-18/19] 
Government debt eclipsed $40 trillion, with the total U.S. IOU hitting $40.05 trillion as of that Tuesday, some four and a half years after topping $30 trillion
, confirming the milestone crossing occurred in mid-August 2026, months earlier than prior CBO projections.

- [2026-08-18] 
Six months earlier, CBO had projected total borrowing would top out at $39.4 trillion for the fiscal year, but Treasury reported debt at $39.9 trillion and counting by mid-August
, indicating the debt trajectory is running ahead of official baseline forecasts.

- [2026-02] 
CBO's baseline projects the federal budget deficit in fiscal year 2026 at $1.9 trillion, growing to $3.1 trillion by 2036
, implying roughly $160 billion/month of average deficit-driven borrowing if spread evenly (actual borrowing is uneven, often bunched near quarter-end).

- [2026] The statutory debt ceiling stands at $41.1 trillion, 
having been lifted to that level by the One Big Beautiful Bill Act (OBBBA) signed into law on July 4, 2025
. As of Sept 17, debt was about $40.09T, leaving roughly $1.0T of headroom before the limit binds.

- [2026-06] 
Since the $5 trillion increase to $41.1 trillion, debt subject to the limit has increased by $2.9 trillion, consuming more than half of the increased borrowing authority; absent congressional action, the debt limit will most likely be reached between late winter and mid-summer of 2027
 — i.e., after December 31, 2026, so the ceiling is not expected to force a slowdown in debt growth before this question resolves.

- [2026-09-09] 
Once the $41.1 trillion cap is reached, Treasury can typically buy at least a few extra months using extraordinary measures; one economist's off-the-cuff estimate puts the limit being hit around February or March 2027
, further suggesting no binding constraint is expected by year-end 2026.

- [2026-09-09] 
Some Republicans have floated raising the debt limit as soon as the post-election lame-duck session through budget reconciliation
, which — if it happens before Dec 31 — would not itself change the actual debt total but could remove any perceived ceiling constraint on future issuance.

- [2026-08-19] 
Total US public debt surpassed $40 trillion for the first time, a roughly one-third increase in less than five years, and the debt keeps rising, adding nearly $7 billion each day according to the Peter G. Peterson Foundation
, consistent with the roughly $6 billion/day rate cited in the question's own framing.

- [Ongoing] The Debt to the Penny dataset is updated daily on business days (next release each weekday, e.g., data as of Sept 17 published Sept 18); the December 31, 2026 reading (likely published early January 2027, since Dec 31, 2026 is a Thursday) will be the exact resolution figure.

BOTTOM LINE: As of mid-September 2026 the debt stood just above $40.09 trillion and has been oscillating in a roughly $40.0–$40.2 trillion band for a month rather than climbing steadily; with a ~$1.9T FY2026 deficit and ~$6–7B/day average growth, and no debt-limit constraint expected to bind before spring 2027, the debt is likely to continue rising through year-end, plausibly landing somewhere in the low-to-mid $40 trillion range (very roughly $40.5–$41.5T) by December 31, 2026, though the ceiling of $41.1T could cause a temporary flattening if reached before a limit increase.

NOT FOUND: An official Treasury or CBO point projection specifically for December 31, 2026; confirmation of whether the debt limit will be raised again before year-end; the exact Debt to the Penny figure for dates after September 17, 2026 (most recent available reading in search results).

### BASE RATE
- [2024-07-29] The debt 
reached $35 trillion, having increased $2.35 trillion over the prior 12 months
, i.e., roughly $196B/month or $6.4B/day.
- [2023-12-26] One year earlier, 
the debt had increased $2.574 trillion over the trailing 365 days, standing less than $100 billion from $34 trillion
 — implying calendar year-end 2023 debt of about $34.0 trillion.
- [2024-12-09/16] Year-end 2024 debt was 
$36.13–$36.17 trillion, with the debt one year earlier at $33.82–$33.85 trillion, a roughly $2.3 trillion year-over-year rise
.
- [2025-12-03] 
Total gross national debt was $38.40 trillion, $2.23 trillion higher than one year prior, and $11.00 trillion higher than five years prior, with the past year's growth averaging $6.12 billion per day
. This confirms year-over-year growth has been remarkably stable at roughly $2.2–2.6 trillion/year for three straight years.
- [2025-12-03] JEC projected that at the trailing three-year average daily pace, 
the U.S. would reach $39 trillion by approximately March 6, 2026, with each additional trillion taking about 157 days
 — implying roughly $6.4B/day, consistent with 2023–2025 rates.
- [2026-01-12] Debt stood at 
$38.4 trillion as of January 12, 2026
, roughly in line with the JEC's December 2025 trajectory.
- [2026-08-18] Debt 
surpassed $40 trillion, arriving "months earlier than expected," with the $41.1 trillion debt ceiling potentially reached by "early next year"
 — a notable acceleration versus the flat ~$6B/day pace of 2023–2025, driven partly by the OBBBA's added deficits.
- [2026-08-18] Analysts noted 
the Bipartisan Policy Center's preliminary projection that Washington is on track to hit the debt limit between late winter and midsummer 2027, trending toward the earlier end of that range
, meaning the $41.1T ceiling should not bind before Dec 31, 2026.
- [2026-09-09] Confirming this timeline, 
Wrightson ICAP's chief economist projected the debt could hit the limit around February or March (2027), with the "x-date" falling in late 2027 or early 2028
, and 
federal revenue has come in below expectations after the Supreme Court ruled broad tariff powers illegal
, a factor that could push borrowing higher/faster than earlier baselines assumed.
- [2026-08-16] As of mid-August 2026, 
the national debt stood at $39.9 trillion, closing in on the $41.1 trillion ceiling
, with 
Fitch Ratings projecting the ceiling would be hit around mid-2027
.
- Historical comparable-window pattern (Sept 21 to Dec 31): in 2023, 2024, and 2025 the debt rose roughly $0.6–1.0 trillion from late September to year-end (consistent with the ~$6–6.4B/day trend); however 2026's growth rate through August (reaching $40T "months earlier than expected") appears to be running somewhat above the 2023–2025 baseline pace, suggesting the Sept–Dec 2026 increment could be modestly larger than prior years' comparable windows.

NOT FOUND: An authoritative, precise Dec 31 (calendar year-end) "Debt to the Penny" figure for 2023/2024/2025 pulled directly from the Treasury dataset (estimates above are triangulated from JEC/House Budget Committee trackers dated within days of Dec 31); a formal track record of prior CBO/Treasury point-forecast accuracy specifically for year-end debt levels a few months out (only debt-ceiling X-date forecast accuracy was found, not year-end total-debt forecast accuracy).

BOTTOM LINE: Over the last three comparable Sept-to-Dec windows the debt grew at a strikingly stable ~$6–6.4 billion/day, but the pace accelerated markedly in 2026 (crossing $40T "months earlier than expected"), and the $41.1T statutory ceiling is not expected to bind until at least February-2027, so the historical pattern points toward continued unimpeded growth to roughly $40.7–$41.3 trillion by December 31, 2026, with upside risk from the recent acceleration and downside risk only if a near-term ceiling/extraordinary-measures episode artificially freezes reported debt just before year-end.

### KEY FACTORS
**1. Current debt level and trend (most direct driver).** Treasury's Debt to the Penny series shows total public debt outstanding fluctuating just above/below $40.1 trillion through mid-September 2026, having crossed $40 trillion on August 18, 2026. 
Treasury's Debt to the Penny data shows total US public debt outstanding at $40,093,343,468,150 on September 17, 2026, a $736,959,641 decline from the prior record, with debt held by the public lower and intragovernmental holdings higher.
 Over the prior weeks the total oscillated in a narrow ~$40.05–40.18 trillion band. 
On Aug. 31, 2026, total public debt outstanding was about 40.176 trillion dollars… On Aug. 28, 2026, the total was approximately 40.104 trillion dollars.
 This is the primary, controlling input for resolution.

**2. Deficit trajectory (who controls it: Congress/Treasury spending & revenue).** CBO's most recent Monthly Budget Review shows deficits running above last year's pace. 
Based on information available through the end of July, CBO estimates that the fiscal year 2026 deficit will be $2.1 trillion—$200 billion more than the $1.9 trillion deficit projection that CBO published on February 11, 2026.
 
Revenues... are anticipated to be about $200 billion below the February projections, mostly because of smaller-than-expected collections of tariff duties—a result of a Supreme Court ruling
 striking down IEEPA tariffs. This roughly $2.1T/year pace (~$5.7–6B/day) is the baseline growth rate the debt will follow absent shocks, consistent with the Handelsblatt/AP figure of over $6 billion in new debt per day cited in the question background.

**3. Debt-limit constraint (controlled by Congress/Treasury Secretary).** 
The debt ceiling currently stands at $41.1 trillion, having been lifted to that level by the One Big Beautiful Bill Act (OBBBA) signed into law on July 4, 2025... which increased the limit by $5 trillion (rather than suspending it) to $41.1 trillion.
 Nonpartisan estimates place the binding X-date well after this question's Dec 31, 2026 resolution date: 
BPC now estimates that, absent congressional action, the U.S. will most likely reach the debt limit once again sometime between late winter and mid-summer of 2027.
 A separate estimate concurs: 
Based on projected borrowing needs, the federal government is likely to reach the $41.1 trillion debt limit by May 2027.
 This means legally the debt cannot rise above $41.1 trillion, but that ceiling is not expected to bind before Dec 31, 2026, so it is not a likely constraint on the year-end figure, though it puts a hard cap on how far above the current ~$40.1T level the number could realistically climb even in a high-borrowing scenario.

**4. Treasury cash-management/issuance behavior (controlled by Treasury Secretary Bessent).** BPC notes Treasury's cash buffer materially affects near-term debt issuance timing: 
Once the government's borrowing limit is reached, the Treasury Department would need to rely on its cash reserves and accounting maneuvers known as extraordinary measures to meet the nation's ongoing expenses.
 Ahead of hitting the limit, Treasury has discretion on how much cash to hold (it targeted roughly $950 billion in cash by the end of FY2026, per BPC's citation of Treasury guidance), and building versus drawing down that cash buffer can push measured "debt outstanding" up or down by tens of billions on any given date without changing underlying fiscal need — a source of short-term noise in the daily Debt-to-the-Penny series but not the year-end trend.

**5. Government funding/shutdown risk (controlled by Congress).** A shutdown could pause some routine reporting/administrative activity but historically has not stopped debt accumulation (interest and mandatory spending continue). Current status: 
With federal funding set to lapse at midnight on October 1, Congress moved early, passing a continuing resolution that President Trump signed into law on September 2, 2026... The bill keeps federal agencies funded at current levels through December 11, 2026
. This leaves a fresh funding deadline just 20 days before the question's Dec 31 resolution date, creating a modest event risk (another shutdown fight) that could add volatility to Treasury cash operations right before resolution, but is unlikely to materially change the debt total either way.

**What would have to happen, in order, for a materially different outcome:**
1. Deficit continues at ~$2.1T/year FY2026 pace (already largely locked in through Sept 30, FY2026 close) → carries debt to roughly $40.1–40.3T range by Sept 30.
2. Congress avoids/resolves the Dec 11, 2026 funding deadline (a shutdown itself wouldn't reduce debt growth, just possibly slow reporting).
3. FY2027 Q1 (Oct–Dec 2026) deficit accrues at a similar or slightly higher run-rate (given OBBBA tax provisions and elevated defense/Iran-related spending flagged by BPC), adding roughly $500–600B over the quarter if pace holds.
4. Debt limit (currently $41.1T) is not projected to bind before year-end, so no legal cap intervenes before Dec 31, 2026.

BOTTOM LINE: With debt already at ~$40.1 trillion in mid-September 2026 and growing at roughly $6 billion/day (a ~$2.1 trillion/year deficit pace per CBO), and with the $41.1 trillion debt ceiling not expected to bind until "late winter to mid-summer 2027," the trajectory strongly implies the debt will land somewhere in the roughly $40.7–41.1 trillion range on December 31, 2026, likely still comfortably below the statutory ceiling.

NOT FOUND: An official CBO or Treasury point estimate specifically for total debt outstanding on December 31, 2026; any indication that Congress plans to raise the debt ceiling again before year-end 2026; confirmed FY2027 full-year appropriations (only a CR through Dec 11, 2026 exists) that would specify Q1 FY2027 outlay levels precisely.

### EXPERT VIEW
**Official/analyst projections (levels, not just ratios)**
- [2026-02-11] CBO's February 2026 Budget and Economic Outlook, the primary benchmark used by nearly all other forecasters, projects 
debt held by the public will grow by $25 trillion, from nearly $31 trillion today to $56 trillion by 2036, with debt as a share of GDP growing from 100% of GDP today to a record 108% by 2030 and 120% by 2036
. That implies debt held by the public near ~$32.5–33T by the end of calendar 2026 (consistent with the ~$32.4T held-by-public figure Treasury reported on Sept 17, 2026), which combined with ~$7.7–7.8T of intragovernmental holdings puts total (gross) debt on a trajectory of roughly $40.5–41T by Dec 31, 2026 if the FY2026 pace of borrowing (~$1.9T deficit, per CBO) continues. Congressional Budget Office, cbo.gov/publication/61882.
- [2026-02-27 basis, House Budget Committee plan cited by CBPP] An HBC-modeled path (using different, more optimistic policy assumptions) showed 
debt subject to the limit rising from the current $36.1 trillion to $37.7 trillion by the end of fiscal year (FY) 2025, $39.8 trillion by the end of FY 2026, and $41.8 trillion by the end of FY 2027
 — an earlier, lower-borrowing scenario than what has actually materialized (actual gross debt already exceeded $40T by August 2026, ahead of this schedule).
- [2026-05-07] CRFB's Debt Ceiling Q&A confirms the statutory ceiling itself: 
"The debt ceiling currently stands at $41.1 trillion, having been lifted to that level by the One Big Beautiful Bill Act (OBBBA)"
. This creates a hard ceiling on gross debt subject to limit near Dec 31, 2026, though Treasury has room below it currently.
- [2026-08-20] The National Taxpayers Union projects the debt limit binding constraint is not imminent within the question's window: 
"Based on projected borrowing needs, the federal government is likely to reach the $41.1 trillion debt limit by May 2027. The U.S. Department of the Treasury would be able to temporarily meet federal obligations for several months beyond this date by using incoming receipts, existing cash on hand, and extraordinary measures."
 This implies no debt-limit-driven cap on gross debt before Dec 31, 2026.
- [2026-09-20] Bipartisan Policy Center's tracking similarly implies no near-term binding constraint: 
"a Committee for a Responsible Federal Budget analysis of CBO's February 2026 baseline projections shows that the average interest rate paid on the national debt could exceed the economic growth rate starting in FY2031... a debt spiral"
 — a longer-run risk, not a 2026 constraint.

**Market/crowd-sourced forecast (Kalshi Citizen Debt Forecast)**
- [2026-09-05] Kalshi Research launched a "Citizen Debt Forecast" (CDF), a market-implied ten-year debt path built from Kalshi's GDP, Fed funds, and CPI markets, layered onto the CBO's fiscal baseline. Per Marginal Revolution's summary, 
"The CBO forecasts the future debt path but it updates only twice a year and is limited to a legislative baseline even when most observers expect, for example, taxes to increase or spending to be cut... The CDF updates continuously and can build in market expectations about future legislative changes,"
 and its projected 2036 debt/GDP path is "slightly more optimistic than the CBO forecast" — implying a similar or slightly lower debt trajectory than the official baseline for year-end 2026, though the CDF's own site frames the primary deficit input as fixed to CBO's baseline (2.2%), so near-term (2026) divergence from CBO is minimal.
- No standalone, liquid Kalshi (or other prediction-market) contract asking specifically "Will total debt be above $X trillion on Dec 31, 2026" could be found live; the only debt-level contract located was the now-settled "Above $38T at the end of 2025" market (settled Yes), suggesting markets have not yet built a granular Dec-2026 debt-level contract, or it is not indexed for search.

**Trend-based extrapolation from current Treasury data (context, not a forecast per se)**
- [2026-09-17] The most recent Debt to the Penny reading was 
"$40,093,343,468,150 on September 17, 2026"
, essentially flat over the prior two weeks (peaking at $40.176T on Aug 31 before dipping). Extrapolating the FY2026 average borrowing pace (~$1.9T/year per CBO, ≈$5.2B/day) forward ~105 days to Dec 31, 2026 implies a level in the $40.6–$41.0 trillion range, consistent with CBO's implicit path and comfortably below the $41.1T statutory ceiling.

**Track record note**
- Forecast accuracy has been directionally solid but has repeatedly underestimated near-term acceleration: CBO's January 2025 baseline did not anticipate the scale of the OBBBA's effect; its February 2026 update revised FY2026 deficit and debt-service costs upward, noting 
"The deficit for 2026 is $0.1 trillion (or 8 percent) more in CBO's current projections than it was in the agency's January 2025 projections... The 2025 reconciliation act (Public Law 119-21) and administrative actions related to immigration increased CBO's projections of deficits by $4.7 trillion and $0.5 trillion, respectively"
. This suggests point estimates tend to be revised upward over time, and any Dec-2026 forecast carries meaningful upside risk from legislation/tariff-revenue court rulings.

BOTTOM LINE: Official (CBO) and independent (CRFB, BPC) fiscal-forecasting bodies, plus a trend-line extrapolation of Treasury's own Debt-to-the-Penny data, converge on a Dec 31, 2026 total (gross) public debt level in roughly the $40.6–$41.0 trillion range — below the current $41.1 trillion statutory ceiling but a step up from the ~$40.1 trillion level recorded in mid-September 2026 — with essentially no analyst source projecting a debt-limit crisis or default disrupting that path before year-end.

NOT FOUND: A live, actively-traded prediction-market contract (Kalshi, Polymarket, or similar) with an explicit strike/threshold for "total US debt on Dec 31, 2026" and associated implied probabilities/consensus price; a specific point-estimate "consensus" figure from surveyed private-sector economists (e.g., Wall Street Journal or Bloomberg economist surveys) for the exact Dec 31, 2026 debt level; and a documented historical error/accuracy track record (e.g., RMSE) of CBO's short-horizon (within-year) debt-level projections specifically, as opposed to deficit or debt/GDP projections.

### HIGH CASE
**Current trajectory and starting point**
- [2026-09-17] Total public debt outstanding stood at $40,093,343,468,150 (~$40.09T) per Treasury's Debt to the Penny dataset; debt held by the public was $32.39T and intragovernmental holdings $7.70T — https://www.indexbox.io/blog/us-public-debt-edges-lower-from-record-as-treasury-data-shows-mixed-components/
- [2026-08-31] Debt had peaked earlier at about $40.176 trillion before dipping in early September, showing the series is volatile week-to-week but on a rising multi-month path — https://www.indexbox.io/blog/us-total-public-debt-eases-from-record-as-public-holdings-edge-higher/

**Primary driver for a high-end (above-baseline) outcome: heavier Treasury borrowing**
- [2026-08-03] Treasury's official Marketable Borrowing Estimates state: 
"During the October–December 2026 quarter, Treasury expects to borrow $628 billion in privately-held net marketable debt, assuming an end-of-December cash balance of $850 billion."
 That single figure, added to intragovernmental changes, is the key upside lever — https://home.treasury.gov/news/press-releases/sb0584
- [2026-08-03] Treasury also raised its July–September 2026 quarter estimate to $739 billion, "$68 billion higher than announced in May 2026," driven by weaker net cash flows — an upward-revision pattern that, if it continues into Q4, would push debt above the baseline $40.7T-ish implied path — https://home.treasury.gov/news/press-releases/sb0584
- [2026-08-18] Detroit News reports the CBO's February baseline projected total FY2026 borrowing to "top out at $39.4 trillion," but revenue losses from invalidated tariffs pushed debt past $39.9T by mid-August, i.e., debt is already running well ahead of the CBO baseline — a pattern that, if it persists into Q4, points to a high-end outcome — https://www.detroitnews.com/story/news/politics/2026/08/18/us-debt-set-hit-40-trillion-months-earlier-than-expected/91350095007/

**Debt-limit ceiling as a potential upside cap or accelerant**
- [2026-09-09] Roll Call reports Lou Crandall of Wrightson ICAP projects the government could hit the $41.1 trillion debt limit "around February or March" 2027, implying debt could approach the ceiling by late 2026 if borrowing continues at the pace implied by Treasury's estimates — https://rollcall.com/2026/09/09/unsustainable-fiscal-path-debt-limit-fight-awaits-congress/
- [2026-09-09] Some Republicans have floated raising the debt limit "as soon as the post-election lame-duck session through budget reconciliation," which — if enacted before Dec 31 — would remove any statutory constraint on debt growth into year-end and support a higher print — https://rollcall.com/2026/09/09/unsustainable-fiscal-path-debt-limit-fight-awaits-congress/
- [2026-08-19] PBS News/BPC estimate places the limit-breach most likely between "late winter and mid-summer of 2027," suggesting the $41.1T statutory ceiling is unlikely to bind before Dec 31, 2026 under central assumptions — but a faster deficit blowout (tariff revenue shortfalls, new spending) could bring that forward — https://www.pbs.org/newshour/economy/the-u-s-national-debt-now-stands-at-40-trillion

**Fiscal/deficit pressures that could push toward the high end**
- CBO's February 2026 baseline (pre-tariff-ruling) projected: 
"The deficit for fiscal year 2026 is projected to be $1.9 trillion, equal to 5.8 percent of gross domestic product (GDP)."
 Actual FY2026 deficits are already running above this baseline due to lost tariff revenue.
- [2026-09-09] Roll Call notes 
"federal revenue has been coming in below expectations after the Supreme Court ruled that broad uses of the president's executive powers to levy tariffs were illegal,"
 a structural revenue shortfall that, if sustained through Q4, would push borrowing above Treasury's $628B Q4 estimate.
- The One Big Beautiful Bill Act's tax provisions and any further "reconciliation 3.0" spending expansions (mentioned as being discussed in Congress, not yet including the debt limit) could add to deficits if enacted before year-end, per Roll Call's September 9 report.

BOTTOM LINE: The high-scenario path to Dec 31, 2026 combines (1) Treasury's own $628B Q4 net marketable borrowing estimate layered on the ~$40.09–40.18T September level, (2) continued revenue underperformance from the invalidated tariffs pushing actual borrowing above official estimates (as already happened in FY2026, when debt hit $40T months earlier than the CBO's $39.4T full-year forecast), and (3) any lame-duck-session debt-limit increase or new spending legislation removing headroom constraints — together these could put year-end debt in the $40.7–41.1+ trillion range, potentially testing the $41.1T statutory ceiling itself.

NOT FOUND: No official Treasury or CBO point-estimate specifically for "national debt on December 31, 2026" was located (Treasury only publishes quarterly borrowing estimates, not exact debt-level forecasts); no confirmed legislative action (as of Sept 21, 2026) actually raising the $41.1T debt limit before Dec 31, 2026; no evidence of a new large emergency spending bill (e.g., disaster relief, war funding) enacted in Q4 2026 that would independently accelerate borrowing beyond Treasury's stated estimate.

### LOW CASE
**LOW SCENARIO — evidence-backed path to a Dec 31, 2026 debt figure near/below the bottom of the plausible range**

- [2026-09-17] The official Treasury "Debt to the Penny" dataset showed total public debt outstanding at $40,093,343,468,150 on Sept. 17, 2026, actually a decline of about $737 million from a prior record, and debt has oscillated in a narrow $40.05–$40.18 trillion band since late August rather than climbing steadily — evidence that near-term growth has plateaued rather than accelerated. https://www.indexbox.io/blog/us-public-debt-edges-lower-from-record-as-treasury-data-shows-mixed-components/

- [2026-09-09] 
CBO estimates that the August 2026 deficit totaled $168 billion – with $359 billion in revenue and $527 billion in outlays, $177 billion less than the $345 billion deficit in August 2025
, though CRFB notes this improvement is mostly a timing artifact, not a structural slowdown. https://www.crfb.org/blogs/12-month-rolling-deficit-18-trillion-august-2026

- [2026-09-09] 
The federal government borrowed $1.8 trillion over the past 12 months according to CBO estimates
, a run-rate that, if it held steady for the remaining ~3.5 months of the year, would put year-end debt meaningfully below trajectories implied by the FY2026 full-year deficit figure (which CBO separately projects at ~$2.1 trillion, inflated by tariff refunds). https://www.crfb.org/blogs/12-month-rolling-deficit-18-trillion-august-2026

- [2026-08-10] 
CBO's Monthly Budget Review projects the fiscal 2026 deficit will hit $2.1 trillion, up from $1.9 trillion forecast in February, with federal spending running close to its February baseline
 — meaning the upside deficit surprise is entirely revenue-driven (tariff losses), a factor that could reverse if tariff authority is restored, pulling the deficit (and thus debt growth) back down. https://fortune.com/2026/08/10/how-big-deficit-national-debt-tariffs-cbo/

- [2026-08-10] 
By July, the government was refunding more in tariffs than it collected, with roughly $100 billion refunded on duties collected under the invalidated IEEPA authority
 — a one-time drag on receipts (and thus a debt-increasing factor) that will not repeat indefinitely, meaning Q4 2026 net customs receipts could stabilize or improve relative to mid-2026, a mild downside risk to further debt growth.

- [2026-06-04/updated 2026-06-17] The statutory debt ceiling is $41.1 trillion, and 
the 2025 reconciliation bill increased the federal debt limit by $5 trillion, from $36.1 trillion to $41.1 trillion; since then, debt subject to the limit has increased by $2.9 trillion—consuming more than half of the increased borrowing authority
. https://bipartisanpolicy.org/article/when-will-we-reach-the-debt-limit-again/

- [2026-06-04] 
BPC estimates that, absent congressional action, the U.S. will most likely reach the debt limit once again sometime between late winter and mid-summer of 2027
 — implying the ceiling will NOT be breached before Dec 31, 2026, so a debt-limit-driven cap (which would be the strongest low-scenario mechanism, forcing Treasury into "extraordinary measures" that flatline reported debt) is unlikely to bind before year-end 2026, but slower-than-expected borrowing (e.g., due to Treasury deliberately husbanding cash) could still push the actual number toward the low end.

- [2026-06-04] 
More than $1 trillion in cash reserves would then allow the federal government to continue meeting obligations over a much longer period between reaching the limit and the X Date
, and BPC noted Treasury 
anticipates holding $950 billion on hand at the end of FY2026
-level cash reserves — high cash balances mean Treasury could, in principle, slow net new issuance late in the year without breaching obligations, a mechanism that could modestly restrain debt growth into December.

- [2025-Sept CRS] 
The debt limit was increased by $5.0 trillion, to $41.1 trillion, in July 2025 by P.L. 119-21
, and CRS separately notes 
recent projections suggest such borrowing will approach the debt limit sometime in FY2027, though such estimates are subject to considerable uncertainty
 — corroborating that a ceiling-driven hard stop before Dec 31, 2026 is not the expected path, but leaves open a low-probability tail where slower deficits push the "reach the limit" date out even further, keeping year-end 2026 debt below $41.1 trillion by a comfortable margin.

- [2026-07-16] Monthly CBO data show total FY2026 receipts running higher than FY2025 
the fiscal year 2026 federal budget deficit reached $1.4 trillion (through June), up from the $1.2 trillion estimate released for May; total receipts for the fiscal year hit $4.151 trillion, an increase of $142 billion compared to last year
 — stronger individual income/payroll tax collections are a genuine downside-to-debt-growth factor if sustained through Q4.

BOTTOM LINE: The low-scenario path is not a debt-ceiling breach (BPC/CRS both place that in FY2027, well after resolution) but a combination of (a) the actual daily Debt-to-the-Penny series plateauing/declining slightly in Sept 2026 around $40.05–$40.18T rather than accelerating, (b) stronger-than-baseline individual/payroll tax receipts, and (c) Treasury's large ($950B+) cash cushion allowing it to slow net issuance late in the year — together these could keep year-end 2026 debt closer to the low-to-mid $41 trillion range rather than the higher trajectories implied by the $2.1T FY2026 deficit estimate, though a sharp reversal is not evident in current data.

NOT FOUND: No Treasury or OMB estimate specifically for the projected debt level on Dec 31, 2026; no evidence of any policy action (spending cuts, DOGE savings, or restored tariff revenue) large enough to reduce the deficit meaningfully before year-end; no confirmed report of Treasury deliberately slowing bill issuance in Q4 2026.

## Required pre-forecast walkthrough

Before giving percentiles, address these explicitly in your rationale:
  (0) Resolution check: what the resolution source currently shows, and whether the value is already known or fixed as of today.
  (a) The time left until the question resolves.
  (b) The outcome if NOTHING changes from today (the status quo value).
  (c) The outcome if the CURRENT TREND continues.
  (d) The expectations of experts / markets / base rates.
  (e) A plausible scenario that produces a LOW outcome (near p10).
  (f) A plausible scenario that produces a HIGH outcome (near p90).

## Calibration guidance

- **Be humble about tails.** Good forecasters set WIDE 90/10 intervals to account for unknown unknowns. Narrow tails get punished by the log score far more than slightly-biased medians.
- **Status quo anchoring.** The p50 should be close to the status quo value unless you have strong evidence of a trend.
- Don't pile mass at one value — if you're tempted, widen the spread by 20-50%.
- **Markets and experts are priors, not anchors.** If a SAME QUESTION market, analyst consensus, or community percentiles appear in the evidence, treat them as a strong prior — centre near them and widen — and name the specific evidence they lack whenever you move away. RELATED markets are context only.
- **Open bounds carry real mass.** Where a bound is OPEN, the outcome can land beyond it and the question then resolves "below range" / "above range". Put honest probability there (p_below_min / p_above_max in the output) instead of squeezing the distribution inside the displayed range; the season's worst losses were outcomes that landed where the distribution had ~2%.
- **Relative-return / spread questions ("how much will X's return exceed Y's").** A near-zero median is usually right, but size the TAILS to the more VOLATILE leg, not to a generic 2-3pp spread. Two broad equity indices (e.g. Nasdaq-100 vs S&P 500) do stay within roughly ±2-3pp over a two-week window. But when one leg is a commodity (crude oil, gold) or a single high-beta stock (e.g. Nvidia), the two-week realized spread regularly reaches ±10pp or more — crude-vs-equity spreads have hit ±18pp. In those cases set p10/p90 to at least ±10pp (±15pp or wider for oil) while keeping the median near the status-quo spread; the 2-3pp intuition applies only to index-vs-index.
- **Heavy-tailed one-off magnitudes (opening-weekend box office, product-launch or debut numbers).** Pre-event tracking for these routinely misses by ±40% or more, and results land both far above and far below the consensus. Do NOT treat the displayed [min, max] range as the plausible range or clamp p10/p90 to its edges: the outcome can fall outside the range in either direction (recent opening weekends resolved ~7% above a displayed ceiling in one case and roughly half the displayed floor in another). Set p10/p90 wide enough that a 2x-or-0.5x surprise versus your central estimate still lands inside the interval, and when concrete current tracking disagrees with historical/franchise base rates, weight the tracking.

## Output

Return ONLY valid JSON, no markdown fences:

{
  "rationale": "<address (a) through (f) above, then state your distribution — 6-10 sentences total>",
  "p10": <number>,
  "p25": <number>,
  "p50": <number>,
  "p75": <number>,
  "p90": <number>,
  "p_below_min": <probability in [0, 1] that the outcome is BELOW 40500000000000>,
  "p_above_max": <probability in [0, 1] that the outcome is ABOVE 42500000000000>
}

Percentiles MUST be in non-decreasing order (p10 <= p25 <= p50 <= p75 <= p90). p_below_min is P(outcome < 40500000000000); p_above_max is P(outcome > 42500000000000). These must agree with your percentiles: a p10 below the lower bound implies p_below_min > 0.10, a p90 above the upper bound implies p_above_max > 0.10. A mass below ~0.05 on an open side needs a specific reason.