FICA covers four separate taxes taken from your paycheck

FICA is the acronym for the Federal Insurance Contributions Act, and it funds four different programs through payroll deductions. Two of those taxes fund Social Security, one funds Medicare hospital insurance, and one funds Medicare supplemental insurance. Your employer also pays a matching amount for each tax, though you only see the employee portion on your pay stub.

The four taxes are Social Security (6.2%), Social Security on wages above a cap (0.9%), Medicare (1.45%), and Additional Medicare Tax (0.9% on high earners). Together, they typically take about 7.65% from each paycheck for most workers, though the exact amount depends on your income level and whether you cross certain thresholds.

Understanding what each tax funds matters because the programs have different rules about who receives benefits, when you can claim them, and how much you get. The money does not sit in an account with your name on it — it goes into trust funds that pay current beneficiaries, and your future benefits depend on your work history and when you claim.

Key Takeaways

  • Social Security taxes (6.2% up to a wage cap, plus 0.9% on higher wages) fund retirement, disability, and survivor benefits.
  • Medicare taxes (1.45% on all wages) fund hospital insurance, and an additional 0.9% tax applies to wages above $200,000 for single filers.
  • Your employer pays an equal amount for Social Security and Medicare taxes, but you only see the employee portion deducted from your paycheck.
  • FICA taxes are separate from federal income tax and are calculated differently — they apply to all wages with no standard deduction.

Social Security taxes: retirement, disability, and survivor benefits

The Social Security portion of FICA has two parts. The first 6.2% applies to wages up to a cap that changes each year — in 2024, that cap is $168,600. Once your wages exceed that amount in a calendar year, you stop paying the 6.2% tax on additional earnings. This is why high earners see their Social Security tax disappear partway through the year.

The second part is the Additional Social Security Tax of 0.9%, which applies to all wages above $200,000 for single filers, $250,000 for married couples filing jointly, and $125,000 for married couples filing separately. Unlike the 6.2% tax, this 0.9% has no wage cap — it continues on all earnings above the threshold. Your employer does not pay a matching portion of this additional tax; only employees pay it.

Social Security taxes fund three types of benefits: retirement benefits (which you can claim as early as age 62, though the amount is reduced), disability benefits (for workers who become unable to work before retirement age), and survivor benefits (for spouses and children of workers who die). Your benefit amount is based on your 35 highest-earning years of work, so gaps in employment lower your eventual benefit.

Medicare taxes: hospital insurance and supplemental coverage

Medicare taxes have two parts as well. The first 1.45% applies to all wages with no cap — you pay it on every dollar you earn, regardless of how much you make. This funds Part A, which is hospital insurance covering inpatient hospital stays, skilled nursing facility care, hospice, and some home health services.

The second part is the Additional Medicare Tax of 0.9%, which applies only to wages above $200,000 for single filers, $250,000 for married couples filing jointly, and $125,000 for married couples filing separately. Like the additional Social Security tax, this has no wage cap and no employer match. This additional tax also funds Part A.

Medicare becomes available at age 65 for most people, though some younger people with disabilities or end-stage renal disease can may have access to earlier. Part A covers hospital costs but not outpatient care, prescription drugs, or routine doctor visits — those are covered by Part B (medical insurance) and Part D (prescription drug coverage), which have separate premiums that are not funded by FICA taxes.

How FICA differs from federal income tax

FICA taxes and federal income tax are calculated separately and fund different programs. Federal income tax goes to the general Treasury and funds the government's overall operations. FICA taxes go to specific trust funds: the Social Security trust funds and the Medicare trust funds.

The calculation methods are also different. Federal income tax is based on your tax bracket and filing status, and you can reduce it with deductions and credits. FICA taxes are a flat percentage of wages with no deductions allowed — you pay the same rate whether you itemize deductions or take the standard deduction. The only way to lower FICA taxes is to have lower wages or to fall below the thresholds for additional taxes.

Your employer withholds both types of tax from your paycheck, but they appear as separate line items. On your W-2 form at the end of the year, Social Security wages and Medicare wages are listed separately from federal income tax withheld, making it clear how much went to each program.

Self-employed workers pay both the employee and employer share

If you are self-employed, you pay both the employee and employer portions of FICA taxes through the self-employment tax. This means you pay 12.4% for Social Security (up to the wage cap) instead of 6.2%, and 2.9% for Medicare (with no cap) instead of 1.45%. You also pay the additional taxes if your net self-employment income exceeds the thresholds.

Self-employed workers report self-employment tax on Schedule SE of their tax return. You can deduct half of your self-employment tax as an adjustment to income, which provides some relief, but you still pay the full amount. The self-employment tax is calculated on your net profit from self-employment, not your gross revenue.

What happens to FICA taxes after they are collected

FICA taxes go into trust funds, not into individual accounts. The Social Security Administration manages two trust funds: the Old-Age and Survivors Insurance Trust Fund (which pays retirement and survivor benefits) and the Disability Insurance Trust Fund (which pays disability benefits). The Centers for Medicare and Medicaid Services manages the Hospital Insurance Trust Fund (Part A).

These trust funds pay current beneficiaries. When you retire and claim Social Security, your benefits come from taxes currently being paid by workers, not from money you personally contributed. This is why Social Security is sometimes called a "pay-as-you-go" system. The trust funds also hold reserves, but those reserves are finite, and the Social Security trustees publish annual reports on the funds' solvency.

Your work history is tracked through your Social Security number. The Social Security Administration keeps a record of your earnings each year, which determines how much you contributed and how much you will receive in benefits. You can view your earnings record online through your Social Security account to verify it is correct.

FICA taxes for non-citizens and special employment situations

Most workers in the United States pay FICA taxes, including non-citizens with work authorization. Some groups are exempt: certain religious groups that have opted out, some students working on campus, and some government employees hired before specific dates who are covered by alternative retirement systems instead.

Household workers (like nannies or housekeepers) and agricultural workers are covered by FICA if they earn above certain thresholds, though the rules differ slightly from standard employment. Visa holders like H-1B workers pay FICA taxes on their wages. Undocumented workers who work using an Individual Taxpayer Identification Number (ITIN) also pay FICA taxes, though they cannot claim Social Security or Medicare benefits.

Frequently Asked Questions

Can I opt out of paying FICA taxes?

Most workers cannot opt out of FICA taxes — they are mandatory for nearly all employment. The only groups with exemptions are certain religious organizations that have received IRS approval, some students working on their school's campus, and some government employees covered by alternative pension systems. If you believe you may have access to for an exemption, you must file Form 4029 with the IRS.

What if I worked in another country — do those years count toward Social Security?

Social Security credits earned in other countries may count if the United States has a totalization agreement with that country. These agreements prevent you from paying Social Security taxes to two countries on the same earnings. You can contact the Social Security Administration to find out whether your foreign work counts and how it affects your benefit calculation.

Do I get back the FICA taxes I paid if I die before claiming benefits?

You do not get a refund of FICA taxes paid, but your family may receive survivor benefits if you have dependents or a spouse. The amount depends on your earnings record and the ages of your survivors. If you die before claiming Social Security retirement benefits, your surviving spouse and children may be may have access to to benefits based on your work history.

Why do I pay Social Security tax on wages above the cap if I will not get more benefits?

The wage cap for the 6.2% Social Security tax exists, but the additional 0.9% Social Security tax has no cap and applies to all high earners. This additional tax was added in 2013 as part of the Affordable Care Act. The revenue from this tax goes into the Social Security trust fund, though it does not increase your individual benefit calculation.

How much will I receive in Social Security benefits based on my FICA contributions?

Your benefit amount depends on your 35 highest-earning years, not on the total amount you paid in taxes. The Social Security Administration uses a formula that replaces a percentage of your pre-retirement earnings, with lower earners receiving a higher replacement rate. You can view your estimated benefit amount through your Social Security account online.