The US government is spending far more than it collects, and a growing share of that gap is going simply to pay interest on money already borrowed. In 2026, the federal budget math has crossed an uncomfortable threshold that will shape policy for years.
The Headline Numbers
The Congressional Budget Office projects a federal deficit of roughly $1.9 trillion for fiscal year 2026, equal to about 5.8% of gross domestic product. Running a deficit that large outside of a recession or war is historically unusual, and it reflects a structural gap between what Washington spends and what it raises.
Interest Costs Cross $1 Trillion
The most consequential shift is in interest payments. Net interest on the national debt is set to reach about $1 trillion a year in 2026, and the CBO projects it will roughly double to $2.1 trillion over the next decade. Through the early months of the fiscal year, interest payments were already running well above the prior year.
- Interest is now one of the largest single line items in the budget.
- It rivals or exceeds major spending categories like defense.
- Unlike most spending, it cannot be cut without restructuring the debt.
Why Interest Is Climbing So Fast
Two forces are compounding. First, the total stock of debt keeps growing as deficits accumulate. Second, older low-rate debt issued during the cheap-money era is being refinanced at today's higher rates. As trillions in older bonds mature and are replaced, the government's average interest cost ratchets upward.
The Crowding-Out Problem
Economists worry about crowding out. Every dollar spent on interest is a dollar unavailable for infrastructure, research, defense, or tax relief. As interest claims a bigger slice of the budget, lawmakers face tighter trade-offs, and heavy government borrowing can also push up market interest rates for businesses and households, including mortgage borrowers.
Debt as a Share of the Economy
Federal debt held by the public is projected to rise from about 101% of GDP in 2026 toward 120% over the next decade, eventually surpassing the previous record set just after World War II. The CBO has repeatedly warned that this trajectory is not sustainable over the long run.
What Are the Options?
There are only a few levers: raise revenue, cut spending, grow the economy faster, or some combination. None is politically easy. Faster growth helps but rarely closes a gap this size on its own. Meanwhile, the interest bill keeps compounding regardless of which party is in power.
The Bottom Line
The 2026 budget marks a turning point where interest costs have become a dominant fiscal force rather than a footnote. The deficit is large, the debt is rising faster than the economy, and the cost of servicing it now tops $1 trillion a year. That reality will constrain budget choices long after the current headlines fade.