When you ask what we pay taxes for, the honest answer is a short list of big-ticket items. Social Security takes about 22 percent of federal spending. Healthcare programs, chiefly Medicare and Medicaid, take roughly 30 percent between them. National defense runs about 14 percent, and interest on the national debt takes another 14 percent. Everything else the federal government does, from veterans’ care to highways to federal courts, comes out of the remaining fifth or so. The federal government collected approximately $5.26 trillion in FY 2025, and the way that money is divided is a fair snapshot of what the country has decided to fund collectively.
Social Security Is the Single Biggest Item
Social Security alone consumes about 22 percent of the federal budget.1U.S. Treasury Fiscal Data. Federal Spending The program pays monthly benefits to retirees, disabled workers, and surviving family members of deceased workers. It is not funded out of general income taxes. It runs on a dedicated payroll tax under the Federal Insurance Contributions Act: employees pay 6.2 percent of wages and employers match it, for a combined 12.4 percent.2Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
The 6.2 percent only applies up to an annual wage cap. For 2026, that cap is $184,500; earnings above that are not subject to Social Security tax.3Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet Full retirement age is 67 for anyone reaching 62 in 2026, with reduced benefits available as early as 62 and higher benefits available by delaying past 67.4Social Security Administration. What Is Full Retirement Age?
Healthcare: Medicare, Medicaid, and CHIP
Healthcare is the government’s largest collective obligation. Medicare takes about 16 percent of the budget, and Medicaid and the Children’s Health Insurance Program together take another 14 percent.1U.S. Treasury Fiscal Data. Federal Spending Roughly 30 cents of every federal dollar goes to health coverage of one kind or another.
Medicare provides hospital insurance (Part A) and medical insurance (Part B) mainly to people 65 and older, and also covers younger people with certain disabilities or end-stage renal disease.5Centers for Medicare & Medicaid Services. Original Medicare (Part A and B) Eligibility and Enrollment Like Social Security, it has its own payroll tax: 1.45 percent on employees, matched by employers, for a combined 2.9 percent, with no income cap. Higher earners pay an extra 0.9 percent Medicare surtax on wages above $200,000 single or $250,000 married filing jointly.2Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
Medicaid is a joint federal-state program that covers more than 77 million Americans with low incomes, including children, pregnant women, seniors, and people with disabilities.6Centers for Medicare & Medicaid Services. Eligibility Policy CHIP covers children in families that earn too much for Medicaid but cannot afford private coverage.7Medicaid.gov. CHIP Eligibility and Enrollment Both are paid for out of general tax revenue rather than a dedicated payroll tax.
National Defense and Veterans
Defense takes about 14 percent of federal outlays and is the largest single piece of the discretionary budget, meaning Congress votes on the amount each year.1U.S. Treasury Fiscal Data. Federal Spending The money funds the Army, Navy, Air Force, Marine Corps, and Space Force. It covers pay and benefits for roughly 1.3 million active-duty service members and another 760,000 reservists, along with weapons development, installations worldwide, and foreign security assistance.8USAFacts. How Many Troops Are in the US Military?
Veterans’ benefits and services are counted separately and take about 6 percent of total spending.1U.S. Treasury Fiscal Data. Federal Spending The Department of Veterans Affairs provides medical care through a priority group system that ranks veterans by service-connected disability rating, income, and other factors, with those rated 50 percent disabled or higher receiving the highest priority.9Veterans Affairs. VA Priority Groups Title 38 of the U.S. Code governs these benefits, including disability compensation for injuries and conditions linked to military service.10Office of the Law Revision Counsel. Title 38 – Veterans Benefits
The Safety Net: About 9 Percent
Roughly 9 percent of federal spending goes to income security programs.1U.S. Treasury Fiscal Data. Federal Spending The Supplemental Nutrition Assistance Program is one of the largest, providing electronic benefits that eligible low-income households use to buy groceries.11Office of the Law Revision Counsel. 7 USC 2011 – Congressional Declaration of Policy Unemployment insurance pays temporary benefits to workers who lose their jobs through no fault of their own and is funded by employer-paid payroll taxes under the Federal Unemployment Tax Act. Supplemental Security Income pays cash benefits to aged, blind, or disabled people with very limited income and resources. Housing and energy assistance sit in this category too.
These programs are means-tested. You qualify by falling below specific income and asset thresholds, not by having paid in over a working lifetime. That is what sets them apart from Social Security and Medicare, where eligibility is earned through work history.
Interest on the National Debt
One large line item funds nothing at all. Interest on the national debt takes about 14 percent of federal spending, roughly matching what the government spends on defense.1U.S. Treasury Fiscal Data. Federal Spending In the twelve months ending October 2025, the federal government paid approximately $981 billion in net interest.12Joint Economic Committee. National Debt Hits $38.40 Trillion
When the government spends more than it collects, the Treasury borrows the difference by issuing securities: bills that mature in under a year, notes that mature in two to ten years, and longer-dated bonds.13Peter G. Peterson Foundation. What Types of Securities Does the Treasury Issue? As of late 2025, total federal debt held by the public stood at roughly $38.5 trillion.14Federal Reserve Bank of St. Louis. Federal Debt: Total Public Debt (GFDEBTN) Interest payments are non-negotiable. They build no roads, treat no patients, and defend no borders. They are the cost of past borrowing, and they grow as the debt grows and as interest rates rise.
Transportation, Education, and Law Enforcement
Transportation takes about 2 percent of federal spending, education, training, and social services take another 2 percent, and administration of justice takes about 1 percent.1U.S. Treasury Fiscal Data. Federal Spending These slices are small in percentage terms but still add up to hundreds of billions of dollars.
Highway and bridge construction is funded largely through the Highway Trust Fund, which is fed by a federal gasoline tax of 18.4 cents per gallon and a diesel tax of 24.4 cents per gallon.15Bureau of Transportation Statistics. Transportation Economic Trends: Government Transportation Revenue – Trust Funds Those rates have not changed since 1993, which is why the trust fund routinely runs short and Congress transfers general revenue to keep it going. About 2.86 cents per gallon of gasoline tax is directed to the Mass Transit Account, which helps fund public transit systems.16Federal Highway Administration. Highway Trust Fund and Taxes – FAST Act Fact Sheets
Public education is mostly funded by states and localities. Federal money shows up most visibly in higher education: the maximum Pell Grant for the 2026–27 academic year is $7,395 for eligible undergraduates with significant financial need.17Federal Student Aid. 2026-27 Federal Pell Grant Maximum and Minimum Award Amounts The American Opportunity Tax Credit offers up to $2,500 per student for the first four years of college, with up to $1,000 refundable even if you owe no tax.18Internal Revenue Service. American Opportunity Tax Credit
The 1 percent for administration of justice pays for the federal court system, the FBI, the Bureau of Prisons, the Drug Enforcement Administration, immigration courts, and other federal law enforcement. The Department of Justice alone requested about $37.8 billion in discretionary funding for FY 2025, with roughly 56 percent going to law enforcement and 28 percent to federal prisons.
Where the Money Comes From
The spending side only makes sense if you know how the revenue is raised. Individual income taxes bring in about half of all federal revenue. Payroll taxes for Social Security and Medicare provide roughly a third. Corporate income taxes, excise taxes on goods such as fuel and tobacco, and smaller sources make up the rest.
The federal power to tax income comes from the 16th Amendment, ratified in 1913, which let Congress collect income taxes without apportioning the burden among states by population.19National Archives. 16th Amendment to the U.S. Constitution: Federal Income Tax (1913) Before that, the government ran mostly on tariffs and excise taxes. State and local governments layer their own income, sales, and property taxes on top of the federal system; those taxes fund most of what happens close to home, including K-12 schools, local police and fire, water systems, and the majority of road maintenance below the interstate level. Federal taxes fund the national obligations. Local taxes fund the local ones. The list at the top of this article is the federal half of the answer.