Federal income taxes flow into the government’s general fund and pay for almost everything Washington does that isn’t already covered by a dedicated tax. In practice, that means your income tax dollars go mainly to health programs like Medicaid, to the portions of Medicare not covered by payroll taxes, to defense, to income-support programs like food assistance and unemployment, to veterans’ benefits, to the day-to-day operations of federal agencies, and to interest on the national debt. Social Security and Medicare’s hospital insurance run largely on a separate payroll tax, not on the income tax you file each April.
Total federal spending is projected to reach about $7.4 trillion in fiscal year 2026, split across roughly $4.5 trillion in mandatory programs, $1.9 trillion in discretionary programs, and about $1.0 trillion in interest on the debt.1Congressional Budget Office. The Budget and Economic Outlook: 2026 to 2036 Individual income taxes supply about 52 percent of federal revenue, payroll taxes another 32 percent, corporate income taxes around 6 percent, and the rest comes from excise taxes, customs duties, estate taxes, and miscellaneous receipts.2U.S. Department of the Treasury. Government Revenue
Income Tax vs. Payroll Tax: Why the Distinction Matters
The payroll taxes withheld from your paycheck for Social Security and Medicare are earmarked by law for those trust funds. Your income taxes are not. They land in the general fund and can be spent on anything Congress has authorized, from fighter jets to food assistance to interest payments.
That is why a chart showing “22 percent of federal spending goes to Social Security” can mislead if you read it as “22 percent of my income tax goes to Social Security.” Social Security’s checks come mostly from a different tax. When people ask where their income tax goes, the more useful answer sits in the programs that draw heavily on general revenue: Medicaid and other health programs, the parts of Medicare that premiums and payroll taxes don’t cover, defense, income security, veterans’ care, agency operations, and debt service.
The Full Spending Breakdown
Based on year-to-date Treasury data for fiscal year 2026, federal outlays break down roughly like this:3U.S. Department of the Treasury. Federal Spending
- Social Security: 22 percent
- Medicare: 16 percent
- Health, including Medicaid and other health programs: 14 percent
- National defense: 14 percent
- Net interest on the debt: 14 percent
- Income security (unemployment, food assistance, housing): 9 percent
- Veterans benefits and services: 6 percent
- Education, training, and social services: 2 percent
- Transportation: 2 percent
Those top five categories consume about 80 cents of every federal dollar. The remainder covers federal courts, scientific research, foreign aid, environmental protection, and the rest of the government.
Health Programs: The Biggest Claim on Income Tax Revenue
The “Health” category, at about 14 percent of spending, is dominated by Medicaid, the joint federal-state program that covers low-income individuals and families. The federal government sets minimum standards and provides matching funds to states, and the federal share comes almost entirely from general tax revenue. The same category includes the Children’s Health Insurance Program and subsidies for coverage bought through the marketplace, both funded from general revenue.
Medicare itself takes another 16 percent of the budget. Part A, which covers hospital stays, runs mainly on payroll taxes. Part B (doctor visits and outpatient care) and Part D (prescription drugs) are different. They draw heavily on general revenue, with enrollee premiums covering only part of the cost. The standard Part B premium for 2026 is $202.90 per month, and income tax dollars fill the gap between premiums, payroll taxes, and what Medicare actually spends.4Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
Income Security: Food, Unemployment, and Housing
About 9 percent of federal spending goes to income security: unemployment benefits, food assistance, federal employee retirement, and housing support. The Supplemental Nutrition Assistance Program is one of the largest pieces. For a family of four in fiscal year 2026, the maximum monthly SNAP allotment is $994, with eligibility set at gross income below $3,483 per month.5Food and Nutrition Service. SNAP Eligibility Because eligibility is tied to economic conditions, this category expands automatically in recessions and contracts when unemployment falls, without any new vote from Congress.
Defense and the Rest of Discretionary Spending
Discretionary spending, roughly $1.9 trillion in fiscal year 2026, is the portion Congress actively funds each year through twelve appropriations bills.6House Committee on Appropriations. The Appropriations Committee: Authority, Process, and Impact7Senate Appropriations Committee. FY26 Defense Bill Summary8House Armed Services Committee. History of the NDAA Defense accounts for roughly half of all discretionary spending.
The rest of discretionary funding pays for the parts of the government most people actually touch. Veterans’ hospitals and mental health programs account for about 6 percent of total federal spending. The Department of Education supports public schools and Pell Grants for college students with financial need.9U.S. Department of Education. Money for College Transportation dollars maintain highways and transit systems. NASA, the National Science Foundation, and the Environmental Protection Agency all compete for funding in the same annual cycle, with the EPA using its share to enforce pollution standards and oversee contaminated site cleanups.10U.S. Environmental Protection Agency. Cleanup and Reuse Success Stories Diplomatic operations and foreign aid come out of this pot too.
Interest on the National Debt
Interest payments on federal debt are projected to hit roughly $1.0 trillion in fiscal year 2026. That is about 14 percent of the budget, the same share as national defense. This money buys no roads, funds no schools, and protects no one. It pays for past borrowing.
The total national debt stood at approximately $38.4 trillion in early 2026. When the government spends more than it collects, the Treasury borrows the difference by selling securities to domestic and international investors, and it is then legally obligated to pay interest on them.11U.S. Department of the Treasury. Financing the Government Congress cannot cut those payments through the appropriations process. Every dollar spent on interest is a dollar unavailable for anything else, and as this line item has grown to rival defense, it has quietly squeezed the rest of the budget.
Tax Breaks Are a Kind of Spending Too
Not every federal decision about your income taxes shows up as an outlay. Tax expenditures, the deductions, credits, and exclusions written into the code, reduce revenue and function much like direct spending. A tax credit for solar panels has roughly the same budget effect as a check for the same amount; the money simply never reaches the Treasury.
Individual tax expenditures totaled an estimated $2.0 trillion in 2025. The two largest are the exclusion of employer contributions for retirement plans (about $383 billion) and the exclusion of employer-paid health insurance premiums (about $226 billion). Combined, tax expenditures rival the entire discretionary budget.
Some of that money reaches lower-income workers directly through refundable credits. For tax year 2025, the maximum Earned Income Tax Credit ranges from $664 for a worker with no children to $8,231 for a family with three or more children. The credit phases out as income rises, and taxpayers with investment income above $11,950 cannot claim it. Credits like this deliver support through the tax system rather than through a traditional spending program, but the money comes from the same pool that funds everything else.