U.S. debt tops GDP milestone

The United States crossed a fiscal threshold in late March: debt held by the public reached $31.27 trillion, slightly above the economy’s $31.22 trillion in nominal output over the prior 12 months. That put the debt-to-GDP ratio at 100.2%, according to calculations based on Treasury debt data and Commerce Department GDP figures. The Congressional Budget Office had already projected that debt held by the public would reach 101% of GDP in 2026. The crossing itself was widely expected. The immediate focus in Washington and on Wall Street is how much new debt the Treasury must keep selling into the market and at what cost. ### Which debt measure crossed 100%, and what did not? Treasury’s “debt held by the public” measure was the one that moved above GDP, not total gross federal debt. Debt held by the public excludes intragovernmental holdings such as Treasury securities held by federal trust funds, while total public debt outstanding includes those internal balances as well. Treasury’s Fiscal Data service showed debt held by the public at about $31.28 trillion in mid-May and total public debt outstanding near $38.95 trillion. (fiscaldata.treasury.gov) The March 31 comparison uses a stock-versus-flow convention common in fiscal analysis: debt at a point in time against nominal GDP over the previous four quarters. The Committee for a Responsible Federal Budget said debt held by the public was $31.27 trillion on March 31, while nominal GDP over the prior year was $31.22 trillion. (fiscaldata.treasury.gov) ### Why are officials and investors watching Treasury issuance more than the round number? The U.S. Treasury said last week it borrowed $577 billion in privately held net marketable debt in the January-March quarter and expects to borrow $671 billion in the July-September quarter, assuming an end-of-September cash balance of $950 billion. Those figures point to the scale of securities supply the market must absorb even outside recession conditions. (crfb.org) The Congressional Budget Office said in February that the fiscal 2026 deficit would reach $1.9 trillion, or 5.8% of GDP. CBO Director Phillip Swagel said higher debt is feeding directly into higher interest costs, with net interest outlays projected at $1.0 trillion in 2026. ### What does the budget office project from here? CBO said debt held by the public rises from 101% of GDP in 2026 to 120% in 2036 in its baseline. (home.treasury.gov) The agency said that would move the United States further above the previous post-World War II record of 106% of GDP. The same February outlook projected deficits totaling $23.1 trillion from 2026 through 2035. (cbo.gov) CBO said revenues stay relatively stable as a share of the economy while spending remains elevated, with outlays at 23.3% of GDP in 2026 against a 50-year average of 21.2%. ### Why does this matter for borrowing costs? CBO’s projections show the mechanical link most clearly: net interest outlays rise from $1.0 trillion in 2026 to $2.1 trillion in 2036. (cbo.gov) As debt grows and older low-rate securities mature, more federal borrowing has to be financed at current market yields. Maya MacGuineas, president of the Committee for a Responsible Federal Budget, said after the March data that the 100% reading should be “a wake-up call” for policymakers. (cbo.gov) Her group argues that sustained borrowing leaves the government more exposed to rate increases and reduces room to respond to future crises. ### What comes next on the calendar? (cbo.gov) The Bureau of Economic Analysis released its advance first-quarter GDP estimate on April 30 and is scheduled to publish its second estimate later in May. Treasury’s daily Fiscal Data updates continue to publish debt held by the public, and the department’s next quarterly refunding and borrowing updates will show how much additional marketable debt it expects investors to absorb in the second half of 2026. (crfb.org) (bea.gov)