US Debt Hits $39 Trillion: Interest Costs Now Rival Major Spending

The U.S. National debt has surpassed $39 trillion, reaching a historic milestone that has triggered a surge in interest payments for the federal government. According to Treasury Department data released on March 17, 2026, the gross national debt reached $39,016,762,910,245.14.

This milestone follows a rapid trajectory of growth. The national debt hit $38 trillion in late October 2025 and surpassed $37 trillion in mid-August 2025.

Rising Interest Costs

A budget update from the Congressional Budget Office (CBO) indicates that the cost of servicing this debt has risen significantly. Between October 2025 and March 2026, the government paid approximately $529 billion in interest.

This spending equates to more than $88 billion per month, or more than $22 billion per week. These net interest payments are roughly equal to the combined spending for the same period on the Department of Education and the Department of Defense’s military budget, which cost $70 billion and $461 billion respectively.

The CBO report notes that these service payments have increased because the total debt is larger than it was in the first half of fiscal year 2025 and due to higher long-term interest rates, although declines in short-term interest rates partially mitigated the overall increase.

For the same six-month period in the previous year, the Treasury paid $497 billion to service its debt. This represents a $33 billion increase, or a 7% rise compared to the previous year.

Drivers of Debt Growth

Several factors have contributed to the surging debt, including an aging population and increased federal spending on Medicare and Social Security. Other drivers include large-scale pandemic spending, wars, and tax cuts.

The current environment is further complicated by the U.S.-Israeli war in Iran, which began weeks before the debt hit the $39 trillion mark. The administration is currently balancing competing priorities, including immigration enforcement, boosting defense spending, and passing a massive tax law, while attempting to reduce the overall debt.

The Peter G. Peterson Foundation reported that the U.S. Government spent roughly $880 billion on net interest costs in 2024.

Economic Impact and Projections

The Government Accountability Office has outlined several potential impacts of rising government debt on the public, including:

• Higher borrowing costs for consumers, specifically for cars and mortgages.
• Lower wages resulting from businesses having less available capital to invest.
• Increased costs for goods and services.

Michael A. Peterson, CEO of the Peter G. Peterson Foundation, stated that the current growth rate could lead to a national debt of $40 trillion before the elections in the fall of 2026.

Borrowing trillion after trillion at this rapid pace with no plan in place is the definition of unsustainable

Michael A. Peterson

Fiscal Efforts and Budget Data

Efforts to rebalance the budget include the implementation of tariffs by President Trump. According to the CBO’s latest monthly update, receipts for the first half of the fiscal year totaled $2.5 trillion, which is an increase of $223 billion over the same period last year.

While receipts have risen, outlays have also increased, though at a slower pace. Outlays rose from $3.57 trillion in 2025 to $3.65 trillion in 2026, an increase of $84 billion.