Explainer | Deficit
What is the federal deficit — and how is it different from the debt?
The two most confused words in fiscal policy, untangled — with the actual FY2026 numbers.
Key takeaways
- The deficit is the one-year gap between spending and revenue: $1.97 trillion in FY2026.
- The debt is the running total the government owes: $40.10 trillion as of September 28, 2026.
- Each year’s deficit is added to the debt — and interest on the debt then makes future deficits bigger.
Methodology. Receipt, outlay, and deficit figures below are fiscal-year-to-date totals from the U.S. Treasury’s Monthly Treasury Statement (MTS) for FY2026, the latest published month (August 31, 2026). The debt total is from Treasury’s Debt to the Penny dataset for September 28, 2026. Figures are rounded; see The Numbers for full tables.
The deficit, in one sentence
The deficit is the amount by which the federal government’s spending exceeds its revenue in a single fiscal year. In FY2026 — the budget year that runs from October 1, 2025 through September 30, 2026 — the government spent $6.81 trillion and collected $4.85 trillion. The difference is the deficit:
| FY2026 (through Aug 31) | Amount |
|---|---|
| Total outlays (spending) | $6.81T |
| Total receipts (revenue) | $4.85T |
| Deficit | $1.97T |
Source: U.S. Department of the Treasury, Monthly Treasury Statement, Table 9, August 2026.
The debt, in one sentence
The national debt is the total amount of money the federal government owes right now — the accumulation of every past deficit, minus the rare surpluses, plus interest effects over time. As of September 28, 2026, it stood at $40.10 trillion, or about $117,000 of debt per resident.
Think of it this way: the deficit is the year’s shortfall; the debt is the balance on the credit card after years of shortfalls.
How the deficit becomes debt
When spending exceeds revenue, the Treasury covers the gap by borrowing — selling Treasury securities such as bills, notes, and bonds to investors, foreign governments, and federal trust funds. That new borrowing adds to the outstanding debt. When revenue exceeds spending (a surplus, last seen in the late 1990s and 2001), the government can use the extra cash to pay down debt.
Why interest makes this harder
Borrowing is not free. In FY2026, net interest payments on the debt cost $1.02 trillion — the second-largest category in the entire federal budget, ahead of Medicare and national defense. Interest is effectively mandatory: it must be paid regardless of what Congress decides to fund. As the debt grows, interest grows with it, which widens future deficits, which adds more debt. Economists sometimes call this the deficit–debt spiral.
What would shrink the deficit?
Arithmetically, only two things: higher revenue or lower spending (or both). In practice, the biggest levers are the biggest budget lines — Social Security ($1.53T), net interest ($1.02T), Medicare ($979B), health programs ($926B), and national defense ($876B) together account for roughly three-quarters of all federal spending. That is why serious deficit discussions always return to those five categories.
Sources
- U.S. Department of the Treasury, Monthly Treasury Statement, Table 9 — receipts and outlays by category, August 2026 (fiscaldata.treasury.gov)
- U.S. Department of the Treasury, Debt to the Penny — total public debt outstanding, September 28, 2026 (fiscaldata.treasury.gov)
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