Interest Now Costs More Than the Pentagon
The U.S. now pays more each year to service its $40 trillion national debt than it spends on the entire defense budget. That is the headline.
The U.S. now pays more each year to service its $40 trillion national debt than it spends on the entire defense budget. That is the headline. The deeper number is the one that should make anyone who has watched a few cycles sit up. Net interest payments hit $1.25 trillion in 2025, equal to 18.5% of federal revenue, just above the 18.4% record set in 1991. Analysts warn the U.S. is worse off now than it was then.
In 1991, debt held by the public sat near 44% of GDP. Today it is above 100%. The same interest burden lands on a balance sheet more than twice as heavy relative to the economy. That changes the math. It changes the room.
I have seen this pattern before. Not this exact setup, but the shape of it. A quiet line item swells until it is no longer quiet. Then it starts to crowd out everything else.
The budget math is getting tight
Interest has moved into second place in the federal budget, behind only Social Security. In the first ten months of fiscal 2026, net interest outlays ran about $963 billion, up 14% from the same stretch a year earlier, according to the Congressional Budget Office. That works out to more than $3 billion a day just to keep the debt current.
The 2025 fiscal year already marked the first time debt service costs exceeded Pentagon funding. By mid-2026, interest had also passed Medicare outlays over a rolling twelve-month window. These are not small programs. They are the big three of discretionary and mandatory spending. When interest jumps ahead of them, the rest of the budget has less air.
The Congressional Budget Office projects net interest outlays rising from about $1.0 trillion in fiscal 2026 to $2.1 trillion in 2036. Measured against GDP, interest costs would climb from roughly 3.3% to 4.6%. That is close to the current level of all discretionary spending combined. It is not a crisis today. It is a direction.
Why 1991 is not a clean comfort
Some will say we have been here before. The 18.4% revenue share in 1991 is the proof. That was a high-water mark. It passed without a blowup. The story ends there for people who want it to.
The balance sheet underneath tells a different tale. In the early 1990s, long-term Treasury yields were higher than they have been for much of the last decade, yet the debt load was lighter. Today, even with long yields below their 1991 peaks, the sheer size of the debt makes each basis point more expensive. A smaller rate on a much larger principal can cost more than a larger rate on a smaller one. That is arithmetic, not opinion.
Debt held by the public now exceeds $32 trillion. Gross national debt has crossed $40 trillion. More than $1.25 trillion a year goes to interest alone. That is more than the entire 2026 defense budget. It is also more than four times the annual interest bill in 1991 in dollar terms. The percentage of revenue looks similar. The underlying exposure does not.
There is another difference that matters. In 1991, the U.S. could still argue it had fiscal room to maneuver. Today, with interest already ahead of defense and Medicare on a trailing basis, that room is narrower. Every new borrowing decision carries a heavier carry cost. Every tax cut or new entitlement has to clear a higher hurdle just to avoid making the interest problem worse.
What this means for markets and policy
Higher interest burdens do not cause a market crash by themselves. They change the slope of the path. They make rollovers more sensitive. They make investors watch auctions more closely. They make the 10-year yield a political variable as much as a market one.
When a government spends nearly one dollar in five of its revenue on interest, it has less flexibility in a downturn. It has less ability to cut rates without worrying about the long end of the curve. It has less space to run new deficits without pushing the interest share higher still. That does not mean a sudden break. It means a slower, tighter walk with fewer places to step.
The Treasury has been issuing more long-dated debt in recent years to lock in rates and smooth refinancing risk. That helps on one margin. It also raises the average cost of debt if long yields stay elevated. There is no free lunch. There is only a choice of which bill to pay later.
I do not know where yields go from here. I do not know if growth will outrun the interest bill or if inflation will surprise to the upside or downside. I do know that a $40 trillion balance with interest at record revenue shares leaves less room for error than most headlines suggest. The last time net interest payments were this high was 35 years ago. The balance sheet underneath that number is not the same. The margin for mistake is smaller.