U.S. debt has reached an all-time high of $40 trillion, underscoring the gap between federal spending and government revenues and adding to the debt burden on the U.S. economy.

According to the latest Treasury data, total U.S. debt stands at $40.05 trillion. Of that amount, $32.27 trillion is debt held by the public, while the remaining $7.78 trillion is intragovernmental debt—money one part of the government owes to another, held mostly in trust funds such as Social Security and federal retirement programs. The publicly held portion is the part traded in markets, where investors including mutual funds, banks, pensions, foreign governments and the Federal Reserve buy Treasury securities; Japan and China have long ranked among the largest foreign holders.

U.S. debt has more than doubled over the past nine years and has increased by $1 trillion in just a few months. The milestones have arrived in quick succession: the debt first crossed $20 trillion in 2017, passed $30 trillion in early 2022, and has now reached $40 trillion.

Federal Deficit Continues to Widen

The federal government has continued spending more than it collects in revenue. The deficit for July was reported at $432 billion, the highest monthly deficit since March 2021.

That brings the deficit for the current fiscal year to $1.799 trillion, above the full-year fiscal 2025 deficit of $1.775 trillion. With the federal fiscal year ending September 30, the current year is already running ahead of last year's total, and deficits have now held near or above $1.7 trillion for several consecutive years, reflecting sustained growth in major programs such as Social Security and Medicare alongside defense and interest spending.

With deficits remaining elevated, additional borrowing will be needed, which would push U.S. debt higher still.

Rising Interest Costs Add Pressure

Servicing the debt is becoming more expensive. Higher Treasury interest rates are forcing the federal government to refinance maturing debt at greater cost, increasing interest expenses.

Net interest costs are expected to exceed $1 trillion by fiscal 2026 and would equal 3.3% of GDP. Under existing policies, net interest costs are projected to reach $2.1 trillion in fiscal 2036. Interest has already grown into one of the largest single categories in the federal budget, with net interest outlays surpassing defense spending in recent fiscal years.

The combination of large deficits and rising interest costs creates a cycle in which higher borrowing leads to higher future government spending.

Long-term Treasury yields have also climbed amid concerns about inflation, government borrowing, and the broader fiscal outlook. Recently, the yield on the 30-year bond rose to 5.34%, its highest level since 2007.

Treasury Expands Debt Buybacks

In response to market pressure, the Treasury has expanded some of its repurchase operations in 10- to 30-year bonds. The scale of these buybacks has doubled from $2 billion to at least $4 billion per operation.

The move has helped lower long-term interest rates, although the repurchases remain small relative to the overall Treasury market, the deepest government bond market in the world.

At the same time, businesses continue to borrow significant sums to fund AI infrastructure projects, adding to overall borrowing in credit markets. The Federal Reserve has also reduced its Treasury holdings in recent years, which shifts more of the new issuance to private and foreign investors.

According to the Congressional Budget Office, publicly held debt will equal 101% of U.S. GDP in 2026 and rise to 120% in 2036. That would take debt as a share of the economy past levels last seen in the aftermath of World War II, when debt held by the public peaked above 100% of GDP in the 1940s before a long period of postwar growth brought the ratio down.

The debt milestone raises further questions about future borrowing costs and whether higher interest payments will continue to add pressure to the federal budget. Markers to watch in coming months include the Treasury's quarterly refunding announcements, which set out future auction sizes and buyback plans, and the CBO's regular budget and economic outlook updates.

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