Breakdown of the U.S. Budget: Where the Money Goes

The U.S. federal budget is the government’s yearly plan for spending and revenue: most outlays go to major benefit programs, health care, defense, and interest on federal debt. In fiscal year 2024, federal spending was about $6.75 trillion, while receipts were about $4.92 trillion, leaving a deficit of roughly $1.83 trillion.

What the federal budget includes

The federal budget is not the same as all public spending in the United States. It covers the federal government; state and local governments also collect taxes and spend money on services such as schools, roads, policing, and public health. Nor is the federal budget simply a list of purchases: a large share consists of benefit payments and transfers to individuals, businesses, and other governments.

Fiscal years run from October 1 through September 30. Thus, fiscal year 2024 began October 1, 2023, and ended September 30, 2024. Budget totals are reported by fiscal year, and figures may be rounded, so category totals might not add exactly to the overall number.

Where federal spending goes

For fiscal year 2024, the Treasury reported approximately $6.75 trillion in outlays. The broad categories below show the scale and purpose of spending; exact shares depend on how programs and functions are grouped.

• Social Security: About $1.46 trillion supported retirement, survivors, and disability benefits. It is one of the largest federal spending programs.
• Health programs: Medicare cost roughly $874 billion, and Medicaid about $618 billion. Other health-related spending includes programs and services beyond those two.
• National defense: Roughly $874 billion went to defense, including military personnel, operations, equipment, and related activities. This is a broad spending function, not just the Defense Department’s payroll.
• Net interest: About $882 billion was paid as interest on federal debt, a cost that reflects accumulated borrowing and interest rates.
• Other programs: Spending also supports income assistance, veterans’ benefits, transportation, education, scientific research, housing, agriculture, and federal operations.

These examples are not all mutually exclusive labels in every budget table. “Health” can be presented as a function or broken out by program, for example. The figures are useful for understanding scale, but a precise comparison should use one consistent classification.

How the government receives revenue

Federal receipts in fiscal year 2024 were about $4.92 trillion. Individual income taxes were the largest source, at roughly $2.43 trillion. Social insurance and retirement receipts—including payroll taxes—provided about $1.71 trillion. Corporate income taxes contributed around $530 billion; smaller sources include excise taxes, customs duties, and other receipts.

Receipts are not identical to total economic activity or to the amount taxpayers owe in a particular year. They are the federal government’s recorded collections during the fiscal year. The mix can change with wages, profits, employment, tax rules, and the timing of payments.

Deficit, surplus, and federal debt

A deficit occurs when federal outlays exceed receipts in a fiscal year. In 2024, the difference was about $1.83 trillion. A surplus is the reverse: receipts exceed outlays. The deficit is a yearly flow; the federal debt is the accumulated amount the government owes, adjusted for borrowing and other financial transactions.

To cover a deficit, the Treasury borrows. Borrowing adds to debt held by the public, while some federal debt is held within government accounts. These are related but distinct measures, so a deficit figure should not be described as the total national debt. Interest costs are also spending in the annual budget, and can rise as debt grows or as borrowing costs change.

Mandatory spending and annual appropriations

Budget spending is often divided by how it is determined:

• Mandatory spending is governed mainly by laws that set eligibility and benefit formulas. Social Security, Medicare, and Medicaid are prominent examples. Congress can amend the laws, but these programs generally do not depend on a fresh annual appropriation for every payment.
• Discretionary spending is provided through annual appropriations. Defense and many federal agency activities are funded this way. Congress and the president determine appropriations through the budget and legislative process.
• Net interest is usually shown separately because it reflects interest costs less certain interest income, rather than a new program allocation.

This distinction explains why the annual budget process does not treat every dollar alike. Appropriations debates directly shape discretionary funding, while changes to mandatory programs generally require changes to the laws governing them.

How to read budget percentages and comparisons

A category’s share of the budget is calculated by dividing its spending by total outlays. Using the rounded 2024 figures, Social Security’s $1.46 trillion was about 22% of $6.75 trillion; net interest’s $882 billion was about 13%. These are approximate shares, not separately reported exact percentages.

Comparisons can be misleading if they mix different years, use enacted budget authority rather than actual outlays, or compare federal spending with state and local spending. “Budget authority” is permission to incur obligations; “outlays” are payments actually made. For actual annual spending, outlays are the relevant measure. Inflation-adjusted figures and spending as a share of gross domestic product can also answer different questions than raw dollar totals.

One common misconception is that all federal spending is discretionary or that the entire budget goes to agency operations. In reality, benefit payments and other mandatory programs account for a substantial portion, and interest is a growing budget item. Another is that the deficit and debt are interchangeable: one describes a year’s gap, the other a stock accumulated over time.

Frequently Asked Questions

What is the largest part of the U.S. federal budget?
Social Security is the largest individual program in the 2024 figures, at about $1.46 trillion. Rankings can differ when categories are grouped differently or a different fiscal year is used.

How much does the United States spend in a year?
Federal outlays were about $6.75 trillion in fiscal year 2024. That total covers federal spending only, not all state and local government spending.

What is the difference between the deficit and the debt?
The deficit is the amount by which spending exceeds revenue during a period, usually a fiscal year. Debt is the accumulated amount owed, measured at a point in time.

Is Social Security included in the federal budget?
Yes. Social Security benefit payments are federal outlays and are generally classified as mandatory spending.

Where can I check official budget figures?
The U.S. Treasury publishes annual receipts and outlays in its final budget results, while the Congressional Budget Office publishes budget analyses and projections. Check the fiscal year and whether a table reports receipts, outlays, or budget authority.

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