US Debt to GDP: Where the Ratio Stands and Where It Is Heading

Two ratios, two answers

There are two standard measures of US federal debt, and they give different ratios. Total public debt counts everything the Treasury owes, including about $7.8 trillion held in federal trust funds such as Social Security and other government accounts. Debt held by the public leaves out that internal debt and counts only securities sold to outside investors, including the Federal Reserve. CBO uses the second measure most often because it best captures the borrowing that competes for savings and can push up interest rates.

Debt figures are Treasury's Debt to the Penny for 30 June 2026. GDP is the Bureau of Economic Analysis third estimate for the second quarter, published 30 September 2026. We use the quarter-end pairing because it is the latest date for which both numbers exist.

The debt has kept growing since. Treasury reported $40.46 trillion in total and $32.61 trillion held by the public on 23 October 2026. Set against the same second-quarter GDP, those equal 124.3% and 100.1%. That comparison mixes dates, so treat it as an upper marker: the advance estimate of third-quarter GDP, due on 29 October 2026, will raise the denominator. For the live total, see our national debt clock.

Why published figures differ

Searching for the US debt-to-GDP ratio returns a spread of numbers. Most of the gap comes down to three choices.

• Which debt. Total debt versus debt held by the public, as above, is a gap of about 24 points.
• Which GDP. Quarterly figures use annualized GDP for one quarter. OMB and CBO use GDP for the whole fiscal year. On OMB's fiscal-year basis, gross federal debt was 123.3% of GDP at the end of fiscal 2025 and debt held by the public was 99.5%.
• Which government. The IMF compares countries using general government gross debt, which adds state and local borrowing to the federal figure. Its 2026 Article IV staff report on the US, completed in March 2026, put the figure at 123.9% for 2025 and 125.8% for 2026.

CBO adds a third federal measure that strips out Treasury securities held by the Federal Reserve and the government's own financial assets. On that basis, debt equals 79% of GDP in 2026 in CBO's February projections, rising to 96% in 2036. CBO says this measure better reflects the government's overall effect on credit markets.

History: the 1946 peak and the long decline

Debt held by the public reached 106.1% of GDP at the end of fiscal 1946, after World War II. That remains the record. Gross federal debt, which includes trust fund holdings, hit a higher mark of 126.1% in fiscal 2020.

Source: OMB Historical Table 7.1, published with the fiscal 2027 budget.

The postwar decline did not come from paying the debt off. Debt held by the public rose from $242 billion in 1946 to $344 billion in 1974, about 42% more in dollars. Nominal GDP, which rises with both real output and inflation, grew far faster: from $228 billion to $1.48 trillion, roughly six and a half times. The ratio fell to its postwar low of 23.2% because the economy outgrew the debt.

Since 2001 the direction has reversed. Debt held by the public went from 31.5% of GDP to 99.5% in 2025, with step changes in the 2008 to 2009 financial crisis and the 2020 pandemic, and a steady climb in between.

What CBO projects

CBO's February 2026 baseline assumes current tax and spending law stays in place. On that basis, debt held by the public:

• reaches 101% of GDP at the end of fiscal 2026;
• hits 108% in 2030, passing the 1946 record of 106%;
• reaches 120% of GDP, or $56 trillion, in 2036, more than double the 50-year average of 51%;
• climbs to 175% of GDP by 2056 in CBO's long-term projections.

Interest drives the path. CBO projects net interest rising from 3.3% of GDP in 2026 to 4.6% in 2036, while the primary deficit, which excludes interest, eases from 2.6% to 2.1%. The Federal Reserve's share of debt held by the public rises from 14% to 17% over the same decade. The budget deficit guide covers the annual borrowing behind these numbers.

The baseline is a projection under stated assumptions. It reflects trade policy as of 20 November 2025 and laws in place as of 14 January 2026, before the Supreme Court's February 2026 tariff decision.

How the US compares with other countries

International comparisons use the IMF's general government gross debt, so the US figure is higher than the federal measures above. In the IMF's October 2026 World Economic Outlook database, the US stands at 126.8% of GDP for 2026.

Among the G7, only Japan and Italy carry more debt relative to GDP in 2026. The projections are what stand out. Japan, Italy, Canada and the UK are all projected to have lower ratios in 2031 than in 2026. The US ratio rises by about 18 points and passes Italy's in 2029, when the IMF has the US at 136.4% and Italy at 136.2%.

The IMF's US Article IV report, completed in March 2026, used slightly lower figures: 125.8% for 2026 and 141.5% for 2031. The October database reflects later data and assumptions. Either way, the direction is the same.

What moves the ratio

The ratio changes for three reasons: new borrowing to cover the primary deficit, the interest rate paid on existing debt, and the growth rate of nominal GDP. When nominal growth runs above the average interest rate, the economy outgrows part of the debt. When interest runs above growth, the ratio rises even with a balanced primary budget.

For now, growth has the edge. Nominal GDP rose 6.3% from the second quarter of 2025 to the second quarter of 2026, according to BEA. The average interest rate on marketable Treasury debt was 3.52% in September 2026, according to Treasury. That gap is a large part of why debt held by the public has stayed close to 100% of GDP despite deficits near 6%.

The gap is narrowing from the interest side. Treasury sold 10-year notes at 5.30% and 30-year bonds at 5.618% in its October 2026 auctions, well above the average rate on the debt they replace. As older, cheaper debt matures and is refinanced, the average rate drifts toward current market yields. Who holds the debt shapes how smoothly that refinancing goes; see who owns US debt.