US debt surpasses $40 trillion as interest payments hit $1 trillion
In brief
- US public debt hit $40.047 trillion in August 2026, surpassing national GDP
- Annual interest payments exceeded $1 trillion for the first time in US history
- Debt service now ranks second in federal budget, behind only Social Security
- Treasury yields at 5.34% increase borrowing costs significantly
- CBO projects debt reaching 120% of GDP by 2036 under current policies
The numbers behind the crisis
US public debt now exceeds the size of the entire national economy, which stood at approximately $31.9 trillion in June 2026. The scale of the shift is staggering: that debt load has more than doubled in just a decade.
What makes this moment distinct isn't just the absolute size. Debt service now outpaces federal government spending on national defense, making it the second-largest item in the federal budget after Social Security. Through July of fiscal year 2026, net interest costs reached $963 billion, up 14% from the same period the prior year — a trajectory that's accelerating.
The cost of new borrowing has climbed sharply. The 30-year Treasury yield was sitting around 5.34%, meaning new borrowing comes at a steep price. At these rates, every dollar the government borrows becomes more expensive, compounding the fiscal pressure.
Crowding out and the self-reinforcing trap
Higher interest costs squeeze room for other spending. Defense, infrastructure, education, and social programs all compete for budget space as debt service consumes an ever-larger slice of federal revenue. This crowding-out effect poses a real risk to economic growth and national priorities.
The danger runs deeper still. The US may be approaching a point where debt service costs become self-reinforcing: higher deficits push yields higher; higher yields increase interest payments; larger interest payments widen the deficit. Once that cycle begins, it becomes harder to break without major policy shifts.
What comes next
The Congressional Budget Office projects that debt held by the public could reach around 120% of GDP by 2036. The Government Accountability Office runs a more pessimistic scenario: if current spending and revenue policies remain unchanged, the debt-to-GDP ratio could hit 251% of GDP by 2056.
Shifts in trade policy have disrupted the revenue streams the government had been counting on, compressing the timeline on fiscal pressure points. The next statutory debt limit breach is expected sometime in mid-to-late 2027.
In response, Treasury Secretary Scott Bessent has moved to increase long-term Treasury buybacks as a mechanism to support market liquidity. Meanwhile, proposals for a bipartisan fiscal commission have gained traction, with a majority of both business leaders and voters expressing support.
The math doesn't work forever. Higher Treasury yields make government bonds more attractive on a yield basis, but they also reprice the discount rate applied to equities, tending to compress valuations. That spillover effect — from fiscal stress into market valuations — is why this moment matters beyond Washington.
