Where do your taxes go? At the federal level, four categories swallow most of the money: Social Security takes about 22 percent of spending, Medicare and Medicaid together take roughly 30 percent, national defense takes 14 percent, and interest on the national debt takes another 14 percent.1U.S. Treasury Fiscal Data. Federal Spending State and local taxes are a separate stream, and they pay mostly for public schools, roads, and emergency services. The mix shifts over time as Congress changes priorities and the cost of existing programs climbs.
A quick note on the source of the money before looking at where it lands. Individual income taxes account for roughly 52 percent of federal revenue, and Social Security and Medicare payroll taxes add another 32 percent.2U.S. Treasury Fiscal Data. Government Revenue Corporate taxes, excise taxes, customs duties, and estate and gift taxes cover most of the rest. Total federal spending in fiscal year 2026 is projected at about $7.4 trillion, or roughly 23.3 percent of GDP.3Congressional Budget Office. The Budget and Economic Outlook: 2026 to 2036 Spending consistently exceeds revenue, so the government borrows the difference.
Social Security
Social Security is the single largest item in the federal budget at about 22 percent of all spending. Authorized under Title II of the Social Security Act (42 U.S.C. § 301 et seq.), the program pays monthly benefits to retirees, surviving spouses and children, and people with qualifying disabilities.4Office of the Law Revision Counsel. 42 USC 301 – Authorization of Appropriations
It runs on its own dedicated payroll tax. You pay 6.2 percent of wages, your employer matches with another 6.2 percent, and self-employed workers pay both halves for a combined rate of 12.4 percent.5Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax In 2026, this tax applies only to the first $184,500 of earnings, so someone at or above that threshold contributes a maximum of $11,439 for the year.6Social Security Administration. Contribution and Benefit Base
Social Security is classified as mandatory spending, which means benefits go out automatically to everyone who qualifies. Congress does not vote on these payments each year. In January 2026, the average retired worker receives about $2,071 per month after a 2.8 percent cost-of-living adjustment.7Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet
Medicare and Medicaid
Healthcare is the second-largest destination for federal tax dollars. Medicare alone takes about 16 percent of total spending, and Medicaid plus other health programs add another 14 percent.
Medicare
Medicare, authorized under Title XVIII of the Social Security Act, provides health insurance mainly to people age 65 and older, along with certain younger individuals with disabilities.8Office of the Law Revision Counsel. 42 USC Chapter 7, Subchapter XVIII – Health Insurance for Aged and Disabled Part A (hospital insurance) is funded mainly through the 1.45 percent Medicare payroll tax that both you and your employer pay. High earners (individuals over $200,000, or married couples over $250,000) pay an additional 0.9 percent surtax on wages above those thresholds.
Part B (doctor visits and outpatient care) is funded through a combination of enrollee premiums and general tax revenue. The standard 2026 monthly premium for Part B is $202.90, with an annual deductible of $283.9Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles Premiums cover only about 25 percent of Part B costs; the rest comes from general revenue. That is a large part of why Medicare consumes so much of the overall budget.
Medicaid
Medicaid, authorized under Title XIX of the Social Security Act, provides health coverage for people with low incomes. Unlike Medicare, it is jointly funded by the federal government and the states. The federal share varies by state but covers at least half the cost everywhere. There is no fixed annual cap: spending is driven by how many people qualify.
National Defense and Other Discretionary Spending
Not all federal spending runs on autopilot. About one-quarter of the budget is discretionary, meaning Congress has to approve funding each year through the appropriations process. If lawmakers fail to pass spending bills before the fiscal year begins on October 1, unfunded agencies face a partial government shutdown.
Defense
National defense accounts for about 14 percent of total federal spending and roughly half of all discretionary spending. This money covers military personnel salaries, operations, weapons procurement, and research and development. Congress sets defense levels annually through authorization and appropriation bills that the president signs into law.
Non-Defense Discretionary Spending
The other half of discretionary spending supports a wide range of federal agencies and programs. Major categories include:
- Veterans benefits and services, about 6 percent of total federal spending, covering VA healthcare, disability compensation, and education benefits.
- Education, training, and employment, roughly 2 percent, including federal student aid, job training, and grants to school districts.
- Transportation, about 2 percent, funding highways, airports, and transit systems through programs like the Highway Trust Fund.
- Science and research, including agencies like NASA, the Department of Energy, and the National Institutes of Health.
- Administration of justice, about 1 percent, covering federal courts, the FBI, and the Bureau of Prisons.
The Congressional Budget and Impoundment Control Act of 1974 sets up the process Congress uses to debate and approve these spending levels each year.10GovInfo. Congressional Budget and Impoundment Control Act of 1974 Shifts in national priorities show up most clearly in this part of the budget.
Interest on the National Debt
About 14 percent of federal spending now goes to interest payments on the national debt, projected at over $1 trillion for fiscal year 2026. When the government spends more than it collects, it borrows the difference by selling Treasury securities to investors around the world.11U.S. Treasury Fiscal Data. Understanding the National Debt
Federal debt held by the public is projected to reach 101 percent of GDP in 2026, meaning the government owes roughly as much as the entire economy produces in a year. Interest payments are non-negotiable: the government must pay them to avoid defaulting. When interest rates rise, this cost grows and leaves less room for other spending. Interest on the debt now rivals national defense as a share of the budget, a shift that would have been hard to imagine a decade ago.
Where State and Local Taxes Go
State and local governments collect taxes separately from the federal government and spend them on services you use daily. The three main revenue sources at this level are property taxes, sales taxes, and state income taxes, though the mix varies widely by location.
Public Schools
K–12 public schools are the largest expense for most state and local budgets. Property taxes typically provide the biggest share of school funding, supplemented by state income and sales tax revenue. These dollars pay for teacher salaries, buildings, classroom supplies, and transportation. Many states also direct a portion of tax revenue to public colleges and universities to keep resident tuition down.
Roads and Transportation
State and local governments fund the majority of road and bridge construction, maintenance, and repairs. The federal government contributes roughly one-quarter of all public highway spending, mainly through the Highway Trust Fund, which is financed by federal excise taxes of 18.4 cents per gallon of gasoline and 24.4 cents per gallon of diesel; those rates have not changed since 1993. Most Highway Trust Fund money flows back to states as grants for road and transit projects. The remaining three-quarters of highway costs come from state fuel taxes, tolls, and general revenue.
Public Safety and Everyday Services
Police departments, fire services, and emergency medical response are funded almost entirely at the local level. These agencies need steady funding for personnel, equipment, training, and facilities. State and local taxes also support public health departments, parks, libraries, water systems, and waste management.
Why the Bill Looks Different in Different States
Nine states (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming) impose no broad-based state income tax on residents, though some tax specific types of income like capital gains.12The White House. The Economic Impact of State Income Tax Elimination Those states tend to lean more heavily on sales and property taxes to fund the same services. Combined state and local sales tax rates range from zero, in states like Oregon and Montana that have no sales tax, to over 10 percent in some jurisdictions. Property tax rates vary widely too. Two people earning identical salaries in different states may end up paying very different amounts to state and local governments.
How Federal Money Reaches Your Community
The line between federal and state spending is not as clean as it looks. A significant share of federal tax revenue gets redistributed to states through grants and matching funds. Medicaid is jointly financed, with the federal government covering more than half the total cost. Federal education grants supplement local school budgets, and Highway Trust Fund transfers help states maintain and expand their road networks. Your federal income taxes indirectly pay for services you see in your own neighborhood: the local highway project partially funded by federal fuel taxes, or the state Medicaid program leaning on federal matching dollars.