U.S. publicly held debt surpassed 100% of gross domestic product as of March 31, crossing a threshold not seen since the aftermath of World War II. The country’s debt reached $31.265 trillion, narrowly edging out the $31.216 trillion produced by the economy over the preceding year. This milestone comes as the federal government runs annual deficits of nearly 6% of GDP.
The interest trap
Rising interest payments are now becoming a primary driver of future deficits, independent of new spending initiatives. While the "primary deficit"—which excludes interest—is projected to remain stable at roughly 2% of GDP, the total deficit is expected to widen toward 10% by the mid-2050s. Analysts at Deutsche Bank warn that this "fiscal dominance" may constrain the Federal Reserve's ability to hike rates to fight inflation without risking a financial crisis.
- Payment surge. Annual interest costs are on track to reach $1 trillion this fiscal year and are projected to hit $2.1 trillion by 2036.
- Debt balloon. The Congressional Budget Office expects publicly held debt to reach 120% of GDP within the next decade.
- Fiscal trade-offs. The U.S. has reached a point where it spends more on debt servicing than on national defense, a condition known as "Ferguson’s Law" that historically correlates with declining global influence.
Pressure on the budget is mounting from competing priorities. The Trump administration has proposed increasing Pentagon spending to $1.5 trillion annually to restock munitions and modernize the defense industrial base. However, White House budget officials have expressed concern that adding $500 billion to military outlays would further accelerate the deficit at a time when borrowing costs are already soaring.
The long-term outlook hinges on the relationship between borrowing costs and economic growth. The Committee for a Responsible Federal Budget warned that if the average interest rate on federal debt exceeds nominal economic growth later this decade, the U.S. could enter a debt spiral.
