Two kinds of federal tax you pay
Income tax is what you owe on your taxable income after deductions. It is progressive: each slice of income is taxed at its own rate, so a higher bracket applies only to the income above its threshold, not to everything you earn.
Payroll taxes (called FICA on your pay stub) pay for Social Security and Medicare. They are taken from wages, and your employer pays a matching share. Self-employed people pay both halves.
Why your dollars cannot be traced
Income taxes, corporate taxes and most other revenue flow into one general pool. Congress then decides what to spend. Payroll taxes are tracked in separate trust funds, but their benefits are still part of the same overall federal budget. So there is no record saying that a particular dollar of your tax paid for a particular road or a particular soldier.
A tax receipt therefore works by proportion: it takes the share of the budget going to each area and applies that share to the tax you paid. It is a fair way to see priorities, not an audit of your own money.
The three kinds of spending
- Mandatory spending is set by existing law and continues without a yearly vote. Social Security, Medicare and Medicaid are the largest examples.
- Discretionary spending is set by Congress each year through appropriations. Defense, education, transportation, scientific research, parks and most agencies' operating budgets fall here.
- Interest on the debt is what the government pays to those it has borrowed from. It is not optional, and it grows or shrinks with the size of the debt and interest rates.
The biggest areas
Using approximate fiscal year 2024 outlays, the five largest areas are Social Security, Medicaid and other health programs, interest on the debt, Medicare, and national defense. Of every $1,000 of federal income tax, that works out to roughly $215 for Social Security, $130 for Medicaid and health, $130 for interest, $125 for Medicare and $125 for defense. Each remaining area is much smaller: income security programs, education and training, veterans' benefits, transportation, and everything else together.
Spending is bigger than tax collected
The federal government regularly spends more than it takes in, and borrows the difference. In recent years that has covered a large share of spending, roughly a quarter by this site's estimate. A tax receipt divides your tax across spending, which is why it describes where the budget goes, not only where your own payment lands.
How to read a tax receipt wisely
- Check the year. Budget shares move from year to year.
- Remember what is left out: state and local taxes, sales and property taxes, and the borrowing described above.
- Treat the numbers as a comparison between areas, such as how big health programs are next to defense, rather than an exact figure.
Try it yourself
Reviewed November 2026. Educational information, not tax, legal or financial advice. All guides