What it actually is

The federal deficit is a yearly gap: when federal spending exceeds federal receipts (mostly taxes) in a fiscal year (a 12-month budget period). It measures flow in a single year, not what the government owes in total.

The total amount the government owes from past deficits is called the national debt. Deficits add to the debt when the government borrows to cover the shortfall.

Official figures come from agencies such as the Department of the Treasury and the Office of Management and Budget (OMB), and from independent scorekeepers such as the Congressional Budget Office (CBO). These agencies use standard accounting and budget rules to report and project deficits.

How it works

Each year Congress and the president set tax and spending laws and proposals that determine receipts and outlays. If lawmakers authorize more spending or lower taxes without offsetting changes, the budget can run a deficit for that year.

To cover a deficit, the Treasury issues and sells government securities (for example, bills and bonds) to investors. That borrowing increases the national debt and leads to future interest payments the government must pay.

Deficits also vary with the economy: in recessions, tax receipts tend to fall and safety-net spending tends to rise, which can increase deficits even without new policy changes. Budget offices, like OMB and CBO, produce multi-year projections to show how current deficits affect future finances.

A real example

Large deficits often appear after major economic shocks or when Congress approves significant new spending. For example, in recent national crises, deficits grew as tax revenues fell and the government approved emergency relief and stimulus measures.

Those episodes show the two main drivers of deficits: policy choices (what Congress and the president approve) and automatic economic effects (like higher unemployment-related spending in a downturn).

Why it matters to you

Deficits affect the size of the national debt, which in turn affects future federal interest costs and the government’s budget choices for programs and taxes.

Short-term deficits can help stabilize the economy during a downturn. Persistent, large deficits can constrain future policy options and may influence interest rates and investment over time.

Common misunderstandings

The federal deficit is not the same as the national debt: the deficit is the yearly gap; the debt is the accumulated total of past borrowing.

A deficit is not automatically "good" or "bad." Small or temporary deficits can finance priorities or stabilize the economy, while large, sustained deficits can create long-term fiscal pressure. Whether a deficit is appropriate depends on context: economic conditions, policy goals, and long-term trends.