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Will U.S. federal deficit-to-GDP for FY2026 be below 5%?

KXDEFGDP-26OCT20-T5 · Economics · 2026-04-07
7%
Agent
7%
Market Price
+0.0%
Edge
90%
Confidence
Final Rationale
My independent estimate of 6% and the market at 7% are essentially converged, both reflecting the near-impossibility of a sub-5% deficit-to-GDP ratio for FY2026. The 5-month YTD deficit of $919B through February 2026 annualizes to ~$2.2T, CBO projects ~$1.9T (6.4% of GDP), and the OBBB tax cuts further reduce revenue. I partially accept the Devil's Advocate critique on tariff revenue (possibly $100-200B rather than my initial $50-100B) and DOGE savings uncertainty, which justifies nudging slightly upward from 6% toward 7%. However, even in the most favorable tail scenario combining maximum tariff revenue, DOGE savings, and strong tax receipts, bridging the ~$400-500B gap needed to reach sub-5% remains implausible. The market's 30-day decline from ~18% to 7% confirms progressive incorporation of worsening fiscal data.
Price vs. prediction
How the market moved after the agent's call. Solid blue line is the actual market price; dashed line is the agent's static forecast at $t{=}0$.
$n = 53$ follow-ups
1. Planner Opus · Fermi decomposition + tool plan
Tools chosen: kalshi_data kalshi_orderbook article_search web_search fred_data code_execution wikipedia_lookup
Sub-questions (Fermi decomposition)
  1. Will the FY2026 federal deficit (in dollar terms) remain below approximately $1.4 trillion (roughly 5% of projected ~$28-29T GDP)? (w=0.45)
  2. Will current spending and revenue trends through April 2026 put the full-year deficit on track to stay below 5% of GDP? (w=0.35)
  3. Will any major fiscal legislation or economic shock in 2026 cause the deficit to increase significantly above the 5% of GDP threshold? (w=0.20)
Planner reasoning
This question asks whether FY2026 (Oct 2025 - Sep 2026) federal deficit will be below 5% of GDP. Key factors: (1) Recent baseline - the deficit has been 6-7% of GDP in FY2022-2025, making sub-5% historically unusual in the post-pandemic era. (2) CBO projections from early 2026 likely forecast ~$1.8-2.0T deficit against ~$29T GDP (~6-7%), well above 5%. (3) The 5% threshold would require roughly $1.4-1.5T deficit. (4) Downside risks: tariff uncertainty could suppress revenue and hurt growth; any recession would balloon the deficit. (5) Upside for 'Yes': strong revenue growth, spending cuts from DOGE-type initiatives, or denominator effects from higher nominal GDP. (6) FY2026 is ~6 months from closing (ends Sep 30, 2026), so year-to-date Treasury data through April provides good early read. The reference class strongly suggests deficit >5% of GDP given structural spending (Social Security, Medicare, defense, interest) and insufficient revenue. Interest costs alone are now ~3% of GDP. This is effectively asking if a dramatic fiscal tightening occurs in the remainder of FY2026, which seems unlikely absent major legislation.
2. Research Parallel tool calls · legacy v2
ToolStatusTimeItemsSummary
kalshi_data OK 3.1s -
kalshi_orderbook OK 0.1s -
article_search OK 0.3s -
web_search OK 64.4s -
fred_data OK 2.1s -
code_execution OK 0.0s -
wikipedia_lookup OK 1.4s -
3. Evidence Synthesis Sonnet · 13 items · legacy v2
#StrengthCredibilityDirectionSourceClaimPriced In
1 STRONG - ↓ DOWN fred_data FY2025 federal deficit was $1,774,684 million (~$1.77 trillion) with GDP at ~$31.4 trillion (Q4 2025), implying a deficit-to-GDP ratio well above 5% in the most recent completed fiscal year. Yes
2 STRONG - ↓ DOWN web_search Cumulative FY2026 deficit reached $919 billion through February 2026 (5 months), already at a pace that would annualize well above $1.4 trillion by fiscal year end. Yes
3 STRONG - ↓ DOWN code_execution CBO baseline projects FY2026 deficit at ~$1.9 trillion (~6.4% of ~$29.5T GDP); even an optimistic scenario of $1.5T yields 5.2% — still above the 5% threshold. Yes
4 MODERATE - ↓ DOWN code_execution Historical base rate analysis shows that only 5 of the last 11 years (2015–2025) had deficit-to-GDP below 5%, and all of those pre-date the current structural spending environment (Social Security, Medicare, high interest costs). Yes
5 STRONG - ↓ DOWN web_search FY2026 outlays through February were $3.1 trillion (5 months), driven by Social Security (+$48B), Medicare (+$36B), and net interest (+$28B) increases year-over-year, reflecting entrenched structural spending growth. Yes
6 STRONG - ↓ DOWN web_search Through February 2026 (5 months), the cumulative FY2026 deficit was $919B — on a trajectory toward approximately $1.8–2.0T for the full year, significantly above the ~$1.4T threshold needed for sub-5% deficit-to-GDP. Yes
7 MODERATE - ↓ DOWN web_search FY2026 cumulative deficit through February was $142 billion lower than FY2025 levels at the same point; however, adjusting for timing shifts the improvement was only $144B, and the deficit remains on track to far exceed 5% of GDP. Yes
8 MODERATE - ↓ DOWN web_search Tax season revenue inflows (March-April) historically reduce monthly deficits, but refunds are expected to be higher in 2026 due to tax cuts in the 2025 'One Big Beautiful Bill Act,' partially offsetting revenue gains. No
9 STRONG - ↓ DOWN web_search CBO February 2026 Budget and Economic Outlook projects FY2026 deficit above 6% of GDP under baseline assumptions, indicating spending and revenue trends are not on track for sub-5%. Yes
10 MODERATE - ↓ DOWN web_search The 'One Big Beautiful Bill Act' (OBBB) enacted in 2025 included tax cuts that are expected to increase refunds and reduce revenue in FY2026, widening the deficit beyond baseline projections. No
11 MODERATE - ↓ DOWN code_execution Scenario analysis shows TCJA extension/tax cuts push projected deficit to ~$2.1T (7.2% of GDP), and a tariff/recession scenario could reach ~$2.2T (7.7%), both far above the 5% threshold. Yes
12 STRONG - ↓ DOWN fred_data Federal outlays-to-GDP ratio stood at approximately 22.8% as of early 2025, reflecting a structural spending baseline that makes sub-5% deficit without major revenue increases or spending cuts essentially impossible absent extraordinary circumstances. Yes
13 MODERATE - ↓ DOWN kalshi_data Kalshi prediction market prices the 'Below 5%' outcome at 7%, down 11 percentage points over the last 30 days, with high liquidity and 2,296 average daily contracts. Yes
Information Gaps
  • March 2026 Monthly Treasury Statement (MTS) was not yet released as of April 7, 2026 — this is the most critical near-term data point that will capture the tax season revenue surge
  • April 2026 YTD deficit data is unavailable, which would provide a much cleaner picture of full-year trajectory after the bulk of tax season receipts
  • No detailed breakdown of the CBO February 2026 projection (exact dollar figures for revenues and outlays) was retrieved
  • No data on whether any DOGE-related spending cuts have materially impacted FY2026 outlays to date
  • No data on tariff revenue impacts in FY2026 — tariffs could provide some upside revenue surprise but scale is uncertain
  • GDP nowcasts for FY2026 denominator are not available — a higher nominal GDP (e.g., from inflation) could reduce the ratio slightly but insufficient to bridge a ~1.5–2 percentage point gap
  • No information on whether any supplemental appropriations or emergency spending bills have been enacted in FY2026
Key Uncertainties
  • Scale and timing of tariff revenue: new tariffs could provide unexpected revenue, but simultaneously reduce economic activity and trade volumes
  • Whether the 'One Big Beautiful Bill Act' tax provisions fully apply in FY2026 or are phased in, affecting the magnitude of revenue reduction
  • Potential recession risk from tariff-related economic disruption — a recession would balloon both outlays (automatic stabilizers) and reduce revenues, pushing deficit far above 5%
  • April 2026 tax season results: whether collections meet, exceed, or fall short of projections
  • Whether DOGE-type spending reduction initiatives have achieved any material savings reflected in FY2026 outlays
  • Nominal GDP growth rate for FY2026 — stronger-than-expected inflation could modestly help the denominator
Market Context
Price: 0.07 · 7d: -0.01 · 30d: -0.11
Volume: HIGH — 2,296 average daily contracts is substantial for a fiscal policy market · Depth: HIGH — depth of 17,398 contracts with tight spread at low probability
Reliability: HIGH — high volume, deep orderbook, 22 days of price history; significant downward drift over 30 days suggests market has incorporated worsening fiscal data; note the wide bid-ask spread ($0.01/$0.01) at very low yes prices is typical for deep out-of-money contracts
4. Independent Forecaster Opus · No market price · legacy v2 Did NOT see market price
Independent estimate: 6% (92% confidence)
sq1: Will the FY2026 federal deficit (in dollar terms) remain below approximately $1.4 trillion (roughly 5% of projected ~$28-29T GDP)?
4%
Base rate: In recent years (FY2020-2025), the deficit has consistently exceeded $1.4T, with FY2025 at $1.77T. The FY2026 deficit through February (5 months) was already $919B, annualizing to ~$2.2T. Even with tax season revenue surges in March-April, CBO projects ~$1.9T for the full year. To get below $1.4T would require either a ~$500B revenue surprise or spending cuts of similar magnitude — neither is plausible given structural spending growth (Social Security, Medicare, interest payments each growing by tens of billions). The OBBB tax cuts further reduce revenue. Tariff revenue could add perhaps $50-100B but not nearly enough. DOGE initiatives have not shown material savings in actual outlays data. This is extremely unlikely — I estimate 4%.
sq2: Will current spending and revenue trends through April 2026 put the full-year deficit on track to stay below 5% of GDP?
5%
Base rate: CBO's February 2026 projection shows deficit above 6% of GDP. Through 5 months, the deficit trajectory is ~$1.8-2.0T against GDP of ~$29-30T, yielding 6-7% deficit-to-GDP. The year-over-year improvement of ~$144B (adjusted) is helpful but insufficient — you'd need an improvement of ~$400-500B to reach sub-5%. Tax season (March-April) typically brings large revenue inflows, but these are already baked into projections, and higher refunds from OBBB tax cuts partially offset collections. Even optimistically, revenues would need to massively outperform projections while spending simultaneously underperforms. The structural spending drivers (Social Security +$48B, Medicare +$36B, interest +$28B through Feb) continue to grow. This is very unlikely — 5%.
sq3: Will any major fiscal legislation or economic shock in 2026 cause the deficit to increase significantly above the 5% of GDP threshold?
88%
This sub-question asks whether legislation or shocks push the deficit ABOVE 5% — which is essentially asking whether the already-above-5% baseline gets worse. The deficit is already projected well above 5% at baseline (~6.4% per CBO). The OBBB tax cuts widen it further. Tariff-related economic disruption could trigger recession, which would balloon the deficit via automatic stabilizers and reduced revenue. Scenario analysis shows deficits of 7-7.7% under adverse scenarios. The probability that some legislation or shock pushes it further above 5% is very high, since it's already above 5%. I interpret this as confirming the deficit stays above 5%. Very likely — 88%.
Show full reasoning trace
base rate: FY2025 deficit was ~6% of GDP ($1.77T/$31.4T). FY2024 was ~6.4%. CBO projects FY2026 at ~6.4%. The last time the deficit was below 5% was FY2019 (4.6%). Post-pandemic structural spending (entitlements + interest) makes sub-5% extremely difficult without major policy changes.
evidence updates: Through-Feb FY2026 deficit of $919B (strong DOWN, confirms trajectory well above 5%). CBO Feb 2026 projection of >6% (strong DOWN). OBBB tax cuts reducing revenue (moderate DOWN). Year-over-year improvement of $144B is insufficient (weak UP, moves needle <1%). No evidence of DOGE material savings (no change). Tariff revenue uncertain but insufficient scale (negligible). Net: all major evidence points strongly against sub-5%.
combination method: Weighted average of three sub-questions. sq1 (45% weight) and sq2 (35% weight) directly assess whether deficit stays below threshold — both very low probability. sq3 (20% weight) assesses whether shocks push deficit further above 5% — very likely yes, so contributes low probability to the 'below 5%' resolution. All sub-questions are strongly correlated in pointing to the same conclusion.
final: The U.S. federal deficit-to-GDP ratio for FY2026 is overwhelmingly likely to exceed 5%. The 5-month YTD data, CBO projections, structural spending growth, and new tax cuts all converge on a deficit of ~$1.8-2.0T against ~$29-30T GDP (6-7%). To resolve YES would require an unprecedented fiscal reversal with no mechanism in sight. I estimate ~6% probability of sub-5% deficit-to-GDP.
5. Devil's Advocate Sonnet · legacy v2 Market price revealed
Reasoning Flaw Missing Info
Challenges
  1. The sub-question decomposition has redundancy issues: sq1 and sq2 are essentially asking the same thing (will the deficit be below 5% of GDP), just framed slightly differently. This means the 'weighted average' approach double-counts essentially the same evidence rather than decomposing the problem into independent factors.
  2. sq3 is awkwardly framed — it asks whether shocks push the deficit 'above 5%' when the baseline is already above 5%. The forecaster acknowledges this but then uses 88% (probability of staying above 5%) rather than converting it cleanly to the YES resolution. The combination method is somewhat ad hoc as a result.
  3. The forecaster notes several important information gaps — March 2026 MTS data, DOGE savings, tariff revenue — but doesn't adequately widen uncertainty for these unknowns. While none individually seems likely to bridge the gap, the combination of (1) tariff revenue surge ($50-100B+), (2) possible DOGE savings in outlays, (3) stronger-than-expected tax receipts, (4) higher nominal GDP from inflation could compound. Each is a low-probability scenario, but conditional on all going favorably, the cumulative effect could be meaningful.
  4. The forecaster dismisses tariff revenue as 'negligible' or '$50-100B,' but under the aggressive tariff regime implemented in 2025-2026, tariff revenue could potentially be significantly higher. Some estimates suggest $200B+ annually under maximum tariff scenarios. This is uncertain but the forecaster may be underweighting this tail.
  5. The estimate of 6% feels appropriate but could arguably be slightly higher (7-8%) given the genuine uncertainty about DOGE savings magnitude, tariff revenue, and the missing March/April data. The forecaster's 92% confidence seems slightly too high given the acknowledged information gaps — though the structural arithmetic strongly supports the conclusion.
Market comparison: Forecaster: 6%, Market: 7%. Divergence is minimal (1 percentage point) and well within noise. Both the forecaster and market agree this is a deep out-of-the-money outcome. The market's 30-day decline from ~18% to 7% confirms the fiscal data has progressively eliminated this possibility. No meaningful divergence to explain.
6. Aggregator Opus · final calibrated forecast
7% (90% confidence)
My independent estimate of 6% and the market at 7% are essentially converged, both reflecting the near-impossibility of a sub-5% deficit-to-GDP ratio for FY2026. The 5-month YTD deficit of $919B through February 2026 annualizes to ~$2.2T, CBO projects ~$1.9T (6.4% of GDP), and the OBBB tax cuts further reduce revenue. I partially accept the Devil's Advocate critique on tariff revenue (possibly $100-200B rather than my initial $50-100B) and DOGE savings uncertainty, which justifies nudging slightly upward from 6% toward 7%. However, even in the most favorable tail scenario combining maximum tariff revenue, DOGE savings, and strong tax receipts, bridging the ~$400-500B gap needed to reach sub-5% remains implausible. The market's 30-day decline from ~18% to 7% confirms progressive incorporation of worsening fiscal data.