U.S. National Debt vs. GDP Growth: Assessing Debt Sustainability

Overview

U.S. Federal debt surpassed $35.5 trillion at the end of FY2024, exceeding 121% of GDP — well beyond the 100% level historically considered high risk. With the U.S. continuing to run large fiscal deficits, financial markets and many experts foresee elevated inflation going forward, as reflected by the elevated yield associated with the 10-year UST, which has not (as of February 2026) responded to short-term interest rate cuts from the Federal Reserve. Optimists believe inflation and long-term rates will naturally fall with increased AI / technology-driven productivity gains, strong economic growth, and the maintenance of the U.S. dollar as the world’s reserve currency.

U.S. Federal Debt vs. Nominal GDP, 1960–2024

Key Observations

Historical Context & Scale

From 1960 to 1980, federal debt hovered between 30–35% of GDP — low enough to be a non-issue in most economic discussions. The Reagan-era defense buildup doubled the debt in dollar terms during the 1980s, pushing the ratio toward 60%. That threshold — the same one later enshrined in the EU’s Maastricht Treaty — prompted genuine bipartisan alarm in the 1990s and was a driving force behind the deficit reduction efforts that produced brief budget surpluses under Clinton (along with massive windfall capital gains tax receipts associated with the dotcom boom). The ratio dipped to ~55% by 2000, the lowest since the early 1980s. Then came the GFC, then the post-GFC recovery spending, then COVID.

In their 2009 study This Time Is Different, economists Carmen Reinhart and Kenneth Rogoff examined eight centuries of sovereign debt crises. Their most striking finding for our purposes: 84% of middle-income country sovereign defaults between 1970 and 2008 occurred at debt-to-GNP ratios below 100%. The U.S. now sits at 121%. The important caveat: the U.S. is a high-income country, issues debt in its own currency, and the dollar remains the world’s reserve currency — advantages no defaulting sovereign has ever enjoyed. Outright default on U.S. Treasuries is near-unimaginable. But the alternative — creating money to service the debt — is inherently inflationary.

The FY2024 federal deficit was approximately $1.83 trillion — the third-largest in history outside of the pandemic years. Annual interest payments on the debt have surpassed $1 trillion and now exceed defense spending for the first time in U.S. history. The Congressional Budget Office projects deficits remaining above $1.5 trillion annually through the foreseeable future, regardless of which party controls the budget. This is not a cyclical problem being driven by recession-era emergency spending; it is structural.

Annual Growth: Debt vs. Nominal GDP vs. Real GDP (2001–2024)

Debt-to-GDP Ratio Trajectory, 1960–2024

The Debasement Trade: Gold, Silver & Bitcoin (Dec 2019–Feb 2026)

Trailing 12 Months: Precious Metals vs. Bitcoin

Methodology & Data Notes

Debt-to-GDP Calculation

Fiscal year-end debt (September 30) divided by calendar year GDP, multiplied by 100. This minor timing mismatch (FY ends Sept, CY ends Dec) follows the convention used by OMB and CBO in official publications. FY2024 debt: $35.5T (GAO audit). CY2024 GDP: $29,298B (BEA/FRED GDPA, Sep 2025 revision). Resulting ratio: 121.0%.

Nominal vs. Real GDP

Debt is denominated in nominal dollars. The standard debt sustainability comparison (the “r versus g” framework popularized by Blanchard, 2019) operates entirely in nominal terms: debt is sustainable when nominal GDP growth (g) exceeds the nominal interest rate on government debt (r). Comparing debt growth to real GDP growth implicitly ignores that inflation erodes the real burden of existing debt. Both comparisons are presented in the data model — with the nominal comparison labeled as the standard framework and the real comparison provided for context.

2024 Data Summary

FY2024 deficit: $1.833T (Treasury MTS Final). Debt growth FY2023→FY2024: 6.9%. Nominal GDP growth CY2023→CY2024: 5.7%. Real GDP growth CY2024: 2.8% (BEA third estimate, Mar 2025). GDP deflator 2024: 2.4%. Gap (debt growth vs. nominal GDP growth): 1.2 percentage points. Gap (debt growth vs. real GDP growth): 4.1 percentage points.

Interest on Debt

Multiple measures exist: GAO reports gross interest of $1,126.5B for FY2024; CBO reports net interest outlays of $949B; the American Action Forum cites $882B. Differences reflect treatment of intragovernmental interest (e.g., interest credited to Social Security trust funds). All sources confirm FY2024 was the first year interest payments exceeded defense spending.

Debasement Trade Methodology

Year-end closing prices (Dec 31) from the sources cited above. The Feb 2026 data point uses Feb 13, 2026. The trailing 12-month comparison indexes all assets to Feb 2025 = 100 and uses approximate first-trading-day-of-month prices. The 60/40 gold/silver weighting for the “Precious Metals Index” is illustrative, chosen to reflect gold’s larger market capitalization while giving meaningful weight to silver’s recent outperformance.

Rogoff & Reinhart Threshold

The 100% debt-to-GDP threshold referenced throughout this analysis comes from Reinhart and Rogoff (2009). The original study found that 84% of middle-income sovereign defaults occurred below this level. Their subsequent work (2010) on “Growth in a Time of Debt” suggested GDP growth slows above 90% debt-to-GDP, though this specific finding was later contested due to a coding error identified by Herndon, Ash, and Pollin (2013). The broader qualitative finding — that very high debt levels are associated with elevated sovereign risk — remains widely accepted.