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

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

KXDEFGDP-26OCT20-T5 · Economics · 2026-05-05

Agent

Market Price

-2.0%

Edge

92%

Confidence

Volume: 52,459

Spread: 1.0c

Days to resolution: 168

Markets in event: 1

Final Rationale

H1 FY2026 deficit already hit $1.2T, mathematically requiring an implausible H2 of only $250B to achieve sub-5% (vs typical $600-900B), and CBO's Feb 2026 baseline projects $1.9T (~6.3%). The Devil's Advocate raised no substantive flaws — I partially accept the tail-risk point but note that 3% already accommodates remote scenarios like GDP revisions or revenue surges. I reject the ensemble-spread concern as immaterial since the arithmetic constraint genuinely binds. The market at 5% is close to my 3% and trending downward toward my view; the 2pp gap reflects the market's effective price floor and residual uncertainty premium, not genuine disagreement.

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 $t{=}0$.

$n = 58$ follow-ups

Re-scan Context

This market has been scanned before. Previous predictions:

Date	Predicted	Market Price	Confidence
2026-04-07	7%	7%	90%

1. Planner Opus · Fermi decomposition + tool plan

Tools chosen: kalshi_data kalshi_orderbook article_search web_search fred_data congress_bills code_execution wikipedia_lookup

Sub-questions (Fermi decomposition)

Will the FY2026 federal deficit in dollar terms be below approximately $1.45 trillion (the level needed to stay under 5% of projected GDP)? (w=0.45)
Will U.S. nominal GDP in FY2026 be sufficiently large (above $29 trillion) to push the deficit-to-GDP ratio below 5% even with a deficit near CBO baseline projections? (w=0.20)
Will Congress pass or implement legislation in FY2026 that produces at least $400 billion in net deficit reduction relative to CBO baseline projections? (w=0.35)

Planner reasoning

This question asks whether FY2026 (Oct 2025 - Sep 2026) federal deficit will be below 5% of GDP, as reported in the joint Treasury/OMB statement released in mid-October 2026. Key analytical steps: First, establish the baseline trajectory. CBO projected roughly $1.865T deficit for FY2026 in early 2025, implying approximately 6.3-6.5% of GDP at ~$29T GDP. FY2025 came in near $1.83T or ~6.4% of GDP. Second, determine what change is needed. To reach below 5%, the deficit must fall to under ~$1.45T, requiring roughly $400-420B in net deficit reduction vs. CBO baseline. Third, assess policy mechanisms. DOGE savings have fallen far short of initial claims. The reconciliation bill being negotiated in Congress is more likely to extend expiring tax cuts (increasing the deficit) than cut it dramatically. Tariff revenues add some uncertainty but are unlikely to close a $400B gap. Fourth, apply temporal reasoning. With today being May 5, 2026, roughly 7 months of FY2026 have elapsed. Monthly Treasury statements through April 2026 should show YTD deficit trajectory. If the pace through April annualizes above $1.8T, hitting sub-5% becomes arithmetically very difficult without enormous H2 spending cuts. Fifth, consider GDP denominator uncertainty. Nominal GDP growth could modestly help, but would need to be implausibly large to offset a $1.8T deficit. Reference class: The US has not had a sub-5% deficit since FY2019 (~3.1%), and fiscal conditions have structurally deteriorated since then. The prior trend strongly suggests this resolves No.

2. Research Parallel tool calls · legacy v2

Tool	Status	Time	Items
kalshi_data	OK	1.8s	-
kalshi_orderbook	OK	0.2s	-
article_search	OK	0.8s	-
web_search	OK	58.5s	-
fred_data	OK	3.9s	-
congress_bills	OK	0.9s	-
code_execution	OK	0.1s	-
wikipedia_lookup	OK	1.4s	-

3. Evidence Synthesis Sonnet · 19 items · legacy v2

#	Strength	Credibility	Direction	Source	Claim	Priced In
1	STRONG	92	↓ DOWN	web_search	CBO projected the FY2026 federal deficit at $1.9 trillion (February 2026), reflecting the One Big Beautiful Bill's $4.7T 10-year cost, partially offset by ~$3T in tariff revenues over 10 years.	Yes
2	STRONG	88	NEUTRAL	web_search	The YTD federal deficit through H1 FY2026 (October 2025–March 2026) totaled $1.2 trillion, which is $139 billion less than the same period in FY2025.	Yes
3	STRONG	87	↓ DOWN	web_search	Q1 FY2026 deficit (Oct–Dec 2025) was $602 billion, including $145 billion in December alone, per CRFB.	Yes
4	STRONG	95	↓ DOWN	fred_data	FY2025 actual deficit was approximately $1.775 trillion (FYFSD as of 2025-09-30), confirming the structural baseline entering FY2026.	Yes
5	MODERATE	80	↑ UP	fred_data	March 2026 monthly deficit was approximately -$164 billion (MTSDS133FMS), a YoY improvement of ~$422 billion, but this may reflect calendar/timing shifts.	Yes
6	STRONG	82	↓ DOWN	code_execution	Scenario analysis shows the central deficit/GDP ratio at 6.32%, with the sub-5% threshold requiring a deficit below ~$1.48T — approximately $390–420B below the CBO baseline of $1.87–1.9T.	Yes
7	MODERATE	75	↓ DOWN	code_execution	Only in the optimistic scenario (low deficit + high GDP) does the ratio approach 4.75%, still near the boundary; the pessimistic scenario yields 7.72%.	No
8	STRONG	90	↓ DOWN	article_search	The One Big Beautiful Bill (reconciliation act) extended and expanded tax cuts, increasing CBO's 10-year deficit projections by $4.7 trillion — this legislation is already enacted and embedded in FY2026 trajectory.	Yes
9	STRONG	93	↑ UP	fred_data	Nominal GDP was $31.856 trillion as of Q1 2026 (annualized), a YoY increase of ~$4.3 trillion, well above the $29 trillion threshold for sq2.	Yes
10	STRONG	92	↑ UP	web_search	CBO projects FY2026 federal outlays at $7.4 trillion (23.3% of GDP) and revenues at $5.6 trillion (17.5% of GDP), implying nominal GDP of approximately $31.8 trillion for FY2026.	Yes
11	STRONG	88	NEUTRAL	web_search	CBO estimates real GDP growth of 2.2% in 2026–27 but with inflation above the Fed's 2% target due to tariffs, supporting nominal GDP well above $29T but not enough to make a $1.9T deficit sub-5%.	Yes
12	STRONG	83	↓ DOWN	code_execution	At the central GDP of ~$29.7T (FY2026 estimate) and CBO deficit of ~$1.875T, the ratio is 6.32%. Even at $32T GDP, a $1.9T deficit yields ~5.9% — GDP alone cannot push the ratio below 5%.	Yes
13	STRONG	91	↓ DOWN	article_search	The One Big Beautiful Bill (already passed by February 2026) increases deficits by $4.7T over 10 years, meaning Congress has already enacted legislation that worsens rather than reduces the deficit.	Yes
14	MODERATE	72	↓ DOWN	article_search	DOGE's actual operations revealed a loosely structured 'club' with little oversight and no verified large-scale spending savings, suggesting DOGE has not produced the $400B+ in deficit reduction needed.	No
15	WEAK	65	↑ UP	article_search	ACA enhanced subsidies lapsed at end of 2025, reducing federal outlays modestly, but this is small relative to the $400B reduction needed.	Yes
16	MODERATE	70	↑ UP	web_search	Tariffs are projected to reduce deficits by ~$3 trillion over 10 years (roughly $300B/year average), but 2026 tariff revenue may be lower as trade volumes adjust — partial offset against the $400B needed but insufficient alone.	Yes
17	STRONG	88	↓ DOWN	web_search	CBO's February 2026 baseline already incorporates the reconciliation act's deficit expansion; no additional legislation producing $400B in net savings in FY2026 is projected or reported.	Yes
18	STRONG	80	↓ DOWN	kalshi_data	Kalshi market 'Below 5%' is priced at 5%, down 1% over 7 days and down 5% over 30 days, with high liquidity (9,451 depth), signaling strong market consensus that sub-5% is very unlikely.	Yes
19	STRONG	78	↓ DOWN	kalshi_orderbook	Orderbook shows yes_bid and no_bid both at $0.01 with a $0.98 spread and 9,451 depth — the market is firmly priced near the floor (5%), with essentially no buying interest for YES.	Yes

Information Gaps

April 2026 Monthly Treasury Statement data not yet fully available — would confirm H2 YTD trajectory more precisely
No data on actual DOGE-attributed spending reductions in dollar terms for FY2026
Actual FY2026 tariff revenue collections through April 2026 not reported — unclear how much tariff income is materializing vs. CBO projections
No data on whether any additional legislation (beyond One Big Beautiful Bill) was passed or is pending that could materially reduce spending
FY2026 nominal GDP final/revised figures won't be available until after the fiscal year ends in September 2026
The web_search result for Q2 MTS appears truncated — exact March 2026 monthly deficit figure is missing
No data on potential recession impact on revenues in H2 FY2026

Key Uncertainties

Whether tariff revenue in FY2026 will come in significantly higher than CBO's ~$300B/year average — could modestly help but unlikely to close the gap alone
Whether a U.S. economic slowdown or recession in H2 2026 could dramatically increase the deficit through automatic stabilizers
Whether any emergency supplemental spending or unforeseen fiscal shocks (natural disaster, military conflict) could widen the deficit further
The YoY improvement in H1 ($139B less than FY2025) raises a question of whether this pace continues — if it does, full-year deficit could be lower than CBO's $1.9T baseline, but still well above $1.45T
Timing and accounting treatment of reconciliation act provisions within FY2026 vs. future fiscal years

Market Context

Price: 0.05 · 7d: -0.01 · 30d: -0.05
Volume: MODERATE · Depth: HIGH
Reliability: HIGH — high depth (9,451 contracts), consistent downward trend, price near floor at 5%, strong consensus signal against YES resolution

4. Independent Forecaster Opus · No market price · legacy v2 Did NOT see market price

Independent estimate: 3% (92% confidence)

base rate

92% conf

evidence driven

92% conf

contrarian

92% conf

Spread

0pp

Low disagreement

sq1: Will FY2026 deficit be below ~$1.45T?

CBO projects $1.9T. H1 FY2026 deficit was $1.2T already, meaning H2 would need to be only $250B (essentially impossible — H2 typically runs $600-900B). Even with the $139B YoY improvement pace continuing, full-year would be ~$1.7T, still well above $1.45T. Base rate of deficit coming in $400B+ below CBO baseline mid-year projection is near zero. Estimate: 3%.

sq2: Will nominal GDP exceed $29T sufficient to push ratio below 5% near baseline deficit?

Nominal GDP is already $31.86T (Q1 2026 annualized), so the $29T threshold is met. However, the question's phrasing requires GDP large enough to push ratio below 5% with baseline deficit. At $1.9T deficit, you'd need GDP of $38T — implausible. Even at $32T GDP, $1.9T = 5.9%. So GDP alone cannot do it. Estimate: 5%.

sq3: Will Congress produce $400B+ in net deficit reduction vs CBO baseline in FY2026?

OBBB already passed and INCREASES deficits. DOGE has not produced verified large savings. Tariffs partially offset but already in baseline. No pending legislation projected to produce $400B FY2026 savings. Base rate of mid-year $400B legislative deficit reduction is essentially zero. Estimate: 2%.

Show full reasoning trace

base rate: US has not had sub-5% deficit/GDP since FY2019. Recent years: FY2023 ~6.3%, FY2024 ~6.4%, FY2025 ~6.4%. Base rate of dropping >1.4pp in one year absent recession recovery is very low.

evidence updates: H1 FY2026 deficit at $1.2T essentially locks in >$1.7T full-year (pushes DOWN strongly). OBBB tax cuts enacted, increasing deficits (DOWN). CBO Feb 2026 projects $1.9T = 6.3% (DOWN). Nominal GDP at $31.86T helps denominator but insufficient. YoY improvement of $139B is positive but far short of the $400B+ needed.

combination method: Weighted average yields ~3%. Sub-questions are correlated; sq1 is the binding constraint and arithmetic from H1 data makes sub-$1.45T essentially impossible.

final: Sub-5% deficit/GDP for FY2026 is arithmetically near-impossible given H1 actuals of $1.2T and CBO baseline of $1.9T. Final: 3%.

ensemble: {'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.03, 'confidence': 0.92}, 'evidence_driven': {'p_yes': 0.03, 'confidence': 0.92}, 'contrarian': {'p_yes': 0.03, 'confidence': 0.92}}, 'spread': 0.0, 'individual_p_yes': {'base_rate': 0.03, 'evidence_driven': 0.03, 'contrarian': 0.03}}

5. Devil's Advocate Sonnet · legacy v2 Market price revealed

Challenges

The forecast at 3% is essentially at the floor and very close to the market's 5%. The arithmetic case is genuinely strong: H1 actuals of $1.2T make sub-$1.45T full-year nearly impossible without an unprecedented H2 surplus shift. No major reasoning flaws identified.
Minor consideration: The forecaster could acknowledge tail risks slightly more — e.g., GDP revisions upward combined with an accounting/timing shift, or a major unforeseen revenue surge — but these are genuinely remote and the 3% already accommodates them.
The ensemble shows zero spread (all three perspectives at 3%), which suggests the 'contrarian' perspective wasn't genuinely contrarian. A true contrarian view should have stress-tested upside scenarios (e.g., large GDP upward revision, unexpected tariff revenue surge) and arrived at a somewhat higher number, even if still low. This is a minor process concern, not a substantive flaw.

Market comparison: Forecaster: 3%, Market: 5%. The 2pp divergence is minimal and likely reflects the market's $0.01 floor pricing and residual uncertainty premium rather than genuine disagreement. The market trend is downward toward the forecaster's view (-5pp over 30d). Divergence is justified and well within reasonable bounds.

6. Aggregator Opus · final calibrated forecast

3% (92% confidence)