US Gross National Debt Surpasses $40 Trillion for the First Time

The United States gross national debt crossed the $40 trillion threshold on 18 August 2026, according to the Treasury Department's daily statement released the following day.

Total public debt outstanding stood at $40.047 trillion. Of that sum, $32.266 trillion was held by the public and $7.782 trillion consisted of intra-governmental holdings such as Social Security trust funds.

The figure arrived less than five months after the debt reached $39 trillion. It has more than doubled since January 2017, when it stood at roughly $19.95 trillion at the start of Donald Trump's first term. Debt rose by $11.6 trillion across Trump's two terms and by $8.4 trillion during Joe Biden's four-year term.

Roughly one-third of the post-2017 increase occurred during the two years of heavy pandemic borrowing. The remainder stems from tax cuts that constrained revenues while mandatory programmes and interest payments expanded. In the first ten months of fiscal year 2026, interest costs overtook Medicare outlays to become the second-largest federal budget item after Social Security.

The Congressional Budget Office has estimated that the One Big Beautiful Bill Act, Trump's second-term legislative package, will add a further $4.7 trillion to the debt trajectory. Annual federal spending runs near $7 trillion, with 60 percent dedicated to mandatory programmes including Social Security, Medicare, Medicaid and veterans' care.

Maya MacGuineas, president of the Committee for a Responsible Federal Budget, said the $40 trillion level does not remain confined to government ledgers. "The more we borrow, the more we exacerbate inflation, squeeze out other priorities in the budget, and leave ourselves vulnerable to emergencies at home and turmoil abroad."

Foreign demand for Treasuries has softened over the past year. A $25 billion auction of 30-year bonds cleared at the highest yield since 2021. Yields on long-dated paper briefly touched multi-decade highs before the Treasury announced it would at least double the size of its longer-term debt buybacks to a minimum of $4 billion per operation.

President Trump dismissed concerns about bond-market volatility, stating that a strong country should see interest rates fall. Debt held by the public now equals approximately 122 percent of GDP on some measures.

Budget watchdogs have warned for weeks that the milestone was approaching. Without higher revenues, lower spending or both, they argue the trajectory remains unsustainable. Interest payments alone now exceed $1.1 trillion a year and continue to climb as older, lower-rate debt rolls over into higher-rate instruments.

The $40 trillion mark is largely symbolic. Markets had already priced in the upward path. Its arrival nevertheless crystallises the scale of the fiscal imbalance that successive administrations have left unaddressed.