If you are wondering where your taxes go, the short answer is that roughly three-quarters of federal spending flows to just five places: Social Security, Medicare, national defense, health programs like Medicaid, and interest on the national debt. State and local taxes fund a different set of services you touch every day, mainly public schools, roads, and police and fire departments. In fiscal year 2025, total federal spending reached $7.01 trillion, and the biggest slices go to programs that run automatically under existing law rather than the line items Congress fights over each year.
The Five Categories That Eat Most of the Federal Budget
Federal spending splits into two buckets. Mandatory spending covers programs like Social Security and Medicare, where eligibility rules written into law decide who gets paid and how much. Discretionary spending covers everything Congress actively funds each year through appropriations, with defense as the largest piece.
For fiscal year 2026, total federal spending breaks down roughly like this:
- National defense: 19.9%
- Medicare: 16.8%
- Social Security: 15.6%
- Health programs including Medicaid: 13.2%
- Net interest on the debt: 11.4%
Those five categories alone account for about 77 cents of every federal dollar. Everything else the government does, from education grants and environmental protection to federal courts and foreign aid, fits inside the remaining 23 percent.1USAspending.gov. Government Spending Explorer When people argue about waste in smaller programs, the math rarely moves the needle. Budget pressure comes from the top of the list.
Why Social Security and Medicare Are Funded Separately
The two biggest mandatory programs do not run on your income tax. They run on payroll taxes collected under the Federal Insurance Contributions Act, which appear as separate line items on your pay stub. Your employer withholds 6.2 percent of your wages for Social Security and 1.45 percent for Medicare’s Hospital Insurance fund, then pays a matching amount on top of that.2Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
Social Security tax applies only up to an annual wage cap. For 2026 that ceiling is $184,500, so the most any individual contributes to Social Security in 2026 is $11,439.3Social Security Administration. Contribution and Benefit Base Medicare has no cap. Every dollar you earn gets hit with the 1.45 percent, and if you earn more than $200,000 as a single filer or $250,000 filing jointly, an additional 0.9 percent Medicare surcharge applies to the amount above those thresholds.4Internal Revenue Service. Topic No. 560, Additional Medicare Tax
These payroll taxes flow into dedicated trust funds rather than the government’s general checking account. Social Security currently pays monthly benefits to roughly 70.8 million people, including retirees, surviving spouses, and individuals with qualifying disabilities.5Social Security Administration. Monthly Statistical Snapshot, April 2026 The money you contribute now pays current beneficiaries.
If you are self-employed, you pay both the employee and employer shares, for a combined 15.3 percent on net self-employment income: 12.4 percent for Social Security up to the wage base and 2.9 percent for Medicare with no cap.3Social Security Administration. Contribution and Benefit Base
Defense and Veterans
Defense is the largest single slice of discretionary spending. In fiscal year 2025, the U.S. spent approximately $919 billion on national defense, covering troop salaries, equipment, bases, cybersecurity, and logistics for roughly 1.34 million active-duty service members. Congress authorizes this spending annually through the National Defense Authorization Act.6House Armed Services Committee. History of the NDAA
A related cost that often gets overlooked is the Department of Veterans Affairs, which received $518.8 billion in budgetary resources for fiscal year 2026, about 3.9 percent of the federal budget on its own.7USAspending.gov. Department of Veterans Affairs Roughly $227 billion of that goes to disability compensation and pensions, and about $134 billion funds healthcare through the Veterans Health Administration. Combined, defense and VA spending is the largest use of federal tax revenue.
Health Programs and the Safety Net
A significant share of your federal income tax funds programs aimed at people who cannot afford healthcare or basic necessities on their own. Medicaid and the Children’s Health Insurance Program are the two largest health-related expenditures outside of Medicare. Medicaid is a joint federal-state program governed by Title XIX of the Social Security Act, covering low-income adults, children, pregnant women, and people with disabilities.8Social Security Administration. Social Security Act Title XIX – Grants to States for Medical Assistance Programs
The Supplemental Nutrition Assistance Program provides monthly food benefits to low-income families.9Food and Nutrition Service. Supplemental Nutrition Assistance Program Supplemental Security Income sends monthly cash payments directly to older adults and people with disabilities who have very little income or assets.10Social Security Administration. Supplemental Security Income (SSI) Despite the similar name, SSI is separate from Social Security retirement benefits and comes from general tax revenue rather than the payroll trust funds.
The Earned Income Tax Credit works differently. Rather than funding a program, the EITC reduces what low-to-moderate-income workers owe at tax time and often results in a refund larger than their actual tax bill. For 2026, the maximum credit reaches $8,231 for a family with three or more qualifying children.11Internal Revenue Service. Rev. Proc. 2025-32 From a budget perspective, refundable credits function like direct spending because the Treasury sends money out rather than simply collecting less.
Interest on the National Debt
This is the line item that produces nothing. No roads, no benefits, no services. It covers the cost of money the government already borrowed and spent. When Washington runs a deficit, it borrows by selling Treasury securities: bills, notes, bonds, and inflation-protected instruments.12TreasuryDirect. About Treasury Marketable Securities Interest on those securities is a legal obligation the government cannot skip.
Total gross national debt reached $38.43 trillion as of early 2026, and net interest payments consumed $970 billion in fiscal year 2025, with projections pointing toward $1 trillion for 2026. Roughly 22 cents of every dollar the government collects in tax revenue now goes straight to bondholders before a single program gets funded. Rising debt and higher interest rates on new borrowing have made debt service one of the fastest-growing parts of the budget, now rivaling defense in size.
What Actually Gets Taxed in the First Place
Before any of your income is taxed, a chunk is shielded entirely. The standard deduction for the 2026 tax year is $16,100 for single filers and $32,200 for married couples filing jointly.11Internal Revenue Service. Rev. Proc. 2025-32 A single person earning $55,000 pays federal income tax on $38,900. Payroll taxes for Social Security and Medicare are different: they apply to your gross wages from dollar one, with no standard deduction to reduce them.
Where State and Local Taxes Go
Federal spending gets the headlines, but state and local taxes fund the services you interact with most often. The split varies by location, but the pattern is consistent: education dominates, followed by infrastructure and public safety.
Public Education
K-12 schools and public universities consume the largest share of state and local tax revenue by a wide margin. State and local governments together provide roughly 87 percent of public school funding, with the federal government covering the rest. Property taxes are the traditional engine for local school budgets, which is why school quality often tracks with neighborhood home values. That funding pays for teacher salaries, classroom materials, and building maintenance.
Roads, Bridges, and Transit
State gas taxes and vehicle registration fees feed transportation budgets alongside federal highway funding. At the federal level, an excise tax of 18.3 cents per gallon of gasoline goes into the Highway Trust Fund, with 15.4 cents dedicated to highways and 2.9 cents funding public transit.13Congress.gov. The Highway Trust Fund’s Highway Account States add their own gas taxes on top. The federal rate has not been raised since 1993, which is one reason infrastructure funding consistently falls short of what engineers say is needed.
Public Safety and Local Services
Police and fire departments, emergency medical services, courts, and jails run primarily on local tax revenue. Property taxes and local sales taxes cover training, equipment, and salaries. Beyond public safety, local governments also handle parks, libraries, water treatment, garbage collection, and public health work like restaurant inspections and immunization clinics. Allocation happens through local budget hearings, so residents who show up have more influence over where their tax dollars land than they might expect.