The Interest Bill Passes $1 Trillion, and the Deficit Heads Toward $1.9 Trillion
Net interest on the federal debt reached roughly $857 billion through the first nine months of the fiscal year, on its way to becoming one of the largest single items in the budget.
WASHINGTON — The federal government spent about $857 billion servicing its debt in the first nine months of fiscal 2026, a pace that puts net interest above $1 trillion for the year and among the largest line items in the entire budget.
The Congressional Budget Office projects a deficit of roughly $1.9 trillion for the fiscal year, equal to about 5.8% of gross domestic product — the third-largest in American history in dollar terms, and unusually large for a year without a recession or a war-scale emergency.
The arithmetic that makes this different
For most of the past two decades, the government could run large deficits cheaply because interest rates were near zero. That is over.
Debt issued at 1% is being refinanced at 4% or more, and the process is mechanical: every maturing Treasury security is replaced at today's yields, regardless of what anyone in Washington decides. The 10-year yield has climbed toward its highest level in about 20 months, which raises the cost of every future refinancing as well.
The CBO projects net interest payments totaling $16.2 trillion over the coming decade, rising from about $1 trillion this year to roughly $2.1 trillion by 2036.
Why the borrowing is so heavy
Three forces are pushing in the same direction.
Spending on health programs and Social Security rises automatically with an aging population, and this year's 2.8% cost-of-living adjustment applies permanently to the entire beneficiary base.
Revenue has been disrupted. The Supreme Court's February decision invalidating the emergency-powers tariffs removed a revenue stream the Treasury had begun to count on, and refund liabilities from duties already collected have been estimated as high as $175 billion.
And interest costs feed on themselves: borrowing to pay interest adds to the debt on which interest is owed.
What it does to everything else
Rising Treasury supply is one of the reasons long-term yields have climbed even with the Federal Reserve on hold, and long yields set the price of a mortgage, a corporate bond and a municipal issue.
That is the practical channel through which fiscal policy reaches households. It arrives not as a tax increase but as a higher monthly payment on a house — which is a large part of why housing affordability has not improved in three years.
