Why the Federal Deficit Rose in FY2026: Revenue, Spending and Debt Explained

U.S. Treasury Department, Washington, D.C.

More revenue, a larger deficit

The federal government collected more money in fiscal year 2026 than it did the year before. Yet it ended the year with a larger budget deficit, close to $2 trillion.

There's no contradiction once you compare both sides of the ledger. Revenue increased, but federal spending climbed much faster. The Treasury Department's final September Monthly Treasury Statement puts FY2026 receipts at $5.403 trillion and outlays at $7.396 trillion. The difference was a $1.992 trillion deficit for the fiscal year that ended September 30.

That number is the result. Understanding why it grew requires looking at what changed from the previous year, not just at the size of the final shortfall.

Spending outpaced the increase in receipts

In FY2025, the deficit stood at approximately $1.775 trillion. By FY2026, it had widened by about $217.1 billion, an increase of roughly 12.2%.

Federal receipts rose by $168.7 billion, or 3.2%. Outlays increased by $385.8 billion, or 5.5%. In dollar terms, the increase in spending was more than twice the increase in revenue.

This is the central explanation for the larger deficit. It wasn't a year in which the government took in less money overall. It was a year in which additional receipts failed to keep pace with additional spending.

A deficit is not the entire national debt

The annual deficit measures the gap between money received and money spent within a fiscal year. The national debt measures outstanding federal borrowing built up over time.

The distinction matters because a nearly $2 trillion annual deficit doesn't mean the country has only $2 trillion in debt, nor does it mean the Treasury borrowed exactly that amount through a single type of transaction. Debt issuance, debt repayments and Treasury cash management are related to the budget balance, but they're not interchangeable with it.

It also matters when evaluating political claims. A fiscal year's deficit reflects obligations and policies accumulated over many years, as well as decisions and economic conditions affecting that particular year.

Interest costs added pressure

One important contributor was the rising cost of servicing federal debt. Treasury's net interest outlays reached approximately $1.052 trillion in FY2026, compared with about $970.4 billion in FY2025. That's an increase of roughly $82 billion.

Interest spending doesn't deliver a new public service in the way that building infrastructure or providing benefits does, but it still uses federal resources. Higher interest costs leave less room in the budget unless revenue rises, other spending falls, or the government borrows more.

Treasury also reported approximately $1.360 trillion in gross interest on Treasury debt securities. That is a different accounting measure from net interest outlays. The two figures shouldn't be added together or presented as competing totals for the same line item.

Customs duties and refunds complicate the revenue story

Customs duties provide another example of why the details matter. Net customs-duty receipts fell from approximately $194.9 billion in FY2025 to $173.2 billion in FY2026, even as total federal receipts from all sources increased.

Treasury also recorded about $144.6 billion in customs-duty refunds in FY2026, compared with roughly $7.5 billion a year earlier. Those refunds matter when evaluating claims about how much tariff revenue the government ultimately retained.

But gross collections, refunds and net receipts answer different questions. Refunds shouldn't be added as a separate loss on top of a net revenue figure that already reflects them. And annual Treasury totals alone can't isolate the fiscal effect of each tariff decision, court ruling or change in collection policy. Establishing those connections requires the underlying legal decisions and the timing of actual collections and refunds.

September's smaller deficit doesn't erase the annual gap

The final month of the fiscal year can give a misleading impression when viewed alone. September 2026 brought in approximately $557.9 billion and recorded $584.8 billion in outlays, leaving a monthly deficit of about $26.9 billion.

That was far smaller than the annual deficit because it represents only one month, already included in the fiscal-year total. Monthly comparisons can also be distorted when the calendar shifts scheduled payments between months. Treasury noted that certain veterans' benefit payments due September 1 were paid in August.

A single month's result is useful for understanding the timing of government cash flows. It can't replace the full-year comparison when the question is whether the federal budget gap widened.

Why the FY2026 deficit grew

The answer is straightforward, even if the policy debate isn't. The government collected more revenue in FY2026, but its spending increased by substantially more. Rising net interest costs added pressure, while lower net customs-duty receipts complicated the revenue picture. Together with changes elsewhere in the federal budget, the result was a shortfall of nearly $2 trillion.

What the annual accounts don't settle is exactly how much of that outcome should be attributed to any one president, law or executive action. Answering that would require a more detailed comparison of program spending, tax changes, economic conditions and policy implementation.

The measurable result is clear: FY2026 ended with more money coming in, even more going out, and a wider gap between the two. That's the fiscal reality any claim about budget success or failure has to confront.