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United States National Debt
The United States national debt refers to the total outstanding financial obligations of the federal government of the United States, comprising debt held by the public (Treasury securities sold to external investors, including foreign governments, domestic institutions, and individuals) and intragovernmental debt (obligations the federal government owes to its own trust funds, such as Social Security and Medicare). As of 2024, the national debt exceeds $35 trillion. Whether the national debt constitutes a fiscal emergency, a manageable feature of sovereign finance, or an instrument of economic policy is a matter of active and contested debate across economics, political science, and public policy. See united-states-national-debt-debate-sustainability-debate and related viewpoint pages for treatment of those disputes.
Current State
The federal government runs an annual budget deficit when its expenditures exceed its revenues in a given fiscal year; the national debt is the cumulative sum of all such deficits (minus surpluses) over time, plus accrued interest. The United States has carried some level of national debt since its founding, though the scale, composition, and economic significance of that debt have varied substantially across historical periods.
Debt held by the public - the portion most directly relevant to financial markets - consists largely of Treasury bills, notes, and bonds. Major foreign holders include Japan, China, and the United Kingdom, though the majority of publicly held debt is domestically owned. Intragovernmental holdings, by contrast, represent accounting obligations between federal agencies and are not traded on open markets.
A common measure of debt burden is the debt-to-GDP ratio, which expresses total debt as a percentage of annual economic output. This ratio climbed sharply during World War II, declined through the postwar decades, rose again following the tax and spending changes of the 1980s, declined in the late 1990s during a period of budget surpluses, and has trended upward since the early 2000s. Major inflection points include the American Recovery and Reinvestment Act (2009), enacted in response to the 2007-2009 financial crisis, and pandemic-era relief and stimulus expenditures beginning in 2020.1) By the early 2020s, the U.S. debt-to-GDP ratio exceeded 120 percent.
The US Dollar's status as the world's primary reserve currency affects how the United States borrows: demand for dollar-denominated assets allows the federal government to issue debt at lower interest rates than most sovereigns. Whether this constitutes a structural advantage that renders conventional debt concerns inapplicable, or merely a contingent condition that could change, is among the contested questions in this area. See united-states-national-debt-debate-reserve-currency-debt-debate.
For extended historical background, see united-states-national-debt-history.
Consensus Status
There is broad agreement among mainstream economists that persistent deficits increase the nominal level of national debt, that rising interest obligations can crowd out other federal expenditures, and that very high debt-to-GDP ratios are associated with slower economic growth under certain conditions - though the precise thresholds and mechanisms remain debated. There is no comparable consensus on the appropriate long-run debt level, the timing or magnitude of fiscal consolidation, or whether current U.S. debt levels are unsustainable. See united-states-national-debt-consensus-fiscal-sustainability-consensus.
Viewpoints
Fiscal conservative / deficit hawk view: The national debt represents an unsustainable intergenerational burden. Continued deficit spending crowds out private investment, risks inflation, and may eventually precipitate a sovereign debt crisis or sharp fiscal adjustment. Proponents generally favor reducing spending and, in some formulations, raising revenues to stabilize or reduce the debt-to-GDP ratio. See united-states-national-debt-fiscal-conservative-viewpoint.
Keynesian / functional finance view: Deficit spending by the federal government is a legitimate and sometimes necessary tool for sustaining aggregate demand, particularly during recessions. At current debt levels and with the dollar as reserve currency, the costs of deficit reduction can exceed its benefits, especially when the economy is operating below capacity. Proponents vary on how urgently debt should be addressed during expansions. See united-states-national-debt-keynesian-viewpoint.
Modern Monetary Theory (MMT) view: A currency-issuing sovereign government such as the United States cannot become insolvent in its own currency and faces no operational financing constraint. The relevant limit on spending is inflation, not debt. From this perspective, “national debt” framing is largely misleading. See united-states-national-debt-mmt-viewpoint.
Supply-side / growth-oriented view: Debt levels are best addressed through economic growth generated by lower taxes and reduced regulatory burden rather than through spending cuts or tax increases. Some adherents argue that certain tax reductions are self-financing through expanded economic activity. See united-states-national-debt-supply-side-viewpoint.
Austerity-skeptic / progressive view: Deficit reduction rhetoric disproportionately targets social programs that benefit lower-income populations, while military expenditures and tax preferences for wealthy individuals and corporations receive less scrutiny. From this perspective, debt framing is often deployed selectively for political purposes. See united-states-national-debt-progressive-viewpoint.
Controversies
Debt ceiling crises: The statutory debt ceiling - a legislative cap on the amount the federal government may borrow - has been the subject of recurring political standoffs, several of which have brought the United States to the threshold of a technical default. See united-states-national-debt-controversy-debt-ceiling-controversy.
Reinhart-Rogoff threshold claim: A widely cited 2010 paper by economists Carmen Reinhart and Kenneth Rogoff argued that national debt above 90 percent of GDP is associated with markedly lower growth; subsequent researchers identified significant methodological errors in the analysis, generating a high-profile dispute over its findings and policy implications. See united-states-national-debt-controversy-reinhart-rogoff-controversy.
Distributional effects of deficit reduction: Debates over which programs to cut or which taxes to raise in pursuit of fiscal consolidation have produced sustained political and scholarly controversy over whose interests are advanced or harmed by particular deficit-reduction packages. See united-states-national-debt-controversy-austerity-distributional-controversy.
Related Pages
History
Debates
Viewpoint Debates
Consensus
Controversies
Related Main Topics
Footnotes
1. U.S. Department of the Treasury, “Debt to the Penny,” TreasuryDirect, accessed 2025, https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/. 2. Congressional Budget Office, The Budget and Economic Outlook: 2024 to 2034 (Washington, DC: CBO, 2024). 3. Office of Management and Budget, Historical Tables, Table 7.1: Federal Debt at the End of Year, https://www.whitehouse.gov/omb/budget/historical-tables/. 4. Carmen M. Reinhart and Kenneth S. Rogoff, “Growth in a Time of Debt,” American Economic Review 100, no. 2 (2010): 573-578. 5. Thomas Herndon, Michael Ash, and Robert Pollin, “Does High Public Debt Consistently Stifle Economic Growth? A Critique of Reinhart and Rogoff,” Cambridge Journal of Economics 38, no. 2 (2014): 257-279. 6. L. Randall Wray, Modern Money Theory: A Primer on Macroeconomics for Sovereign Monetary Systems, 2nd ed. (New York: Palgrave Macmillan, 2015). 7. Alan J. Auerbach and William G. Gale, “The Economic Crisis and the Fiscal Crisis: 2009 and Beyond,” Tax Notes 125 (2009): 101-130.