FICA is the Federal Insurance Contributions Act, a 1935 law that funds Social Security and Medicare

FICA stands for the Federal Insurance Contributions Act. It is the law that requires you and your employer to pay into two programs: Social Security and Medicare. When you see "FICA" on your pay stub, it means money is being withheld from your paycheck to fund these programs.

FICA is not a single tax — it is actually two separate taxes combined. The first funds Social Security, which provides retirement, disability, and survivor benefits. The second funds Medicare Part A, which covers hospital insurance. Both are deducted automatically from your wages if you are employed.

The amount withheld depends on your income and does not change based on your age, health status, or how long you have worked. Self-employed people pay both the employee and employer portions, which is why their FICA tax is roughly double what a W-2 employee pays on the same income.

Key Takeaways

  • FICA funds Social Security retirement benefits and Medicare hospital insurance through automatic payroll deductions.
  • Your employer withholds 6.2% of your wages for Social Security and 1.45% for Medicare, totaling 7.65% of gross pay.
  • Self-employed workers pay both the employee and employer share, which is 15.3% of net self-employment income.
  • FICA taxes stop being withheld once you reach the Social Security wage base limit each year, but Medicare withholding continues on all income.
  • The money you pay into FICA now funds current beneficiaries, not a personal account held in your name.

How much FICA comes out of your paycheck

If you are a W-2 employee, your employer withholds 6.2% of your gross wages for Social Security and 1.45% for Medicare. Your employer also pays an equal amount on your behalf, though you do not see this on your pay stub. Together, the employee and employer portions total 15.3% of your wages.

The Social Security portion stops once you reach a certain income threshold each year. In 2024, that threshold is $168,600 — meaning once you have earned that much in a calendar year, no more Social Security tax is withheld. Medicare tax, however, continues on all income with no upper limit. High earners also pay an additional 0.9% Medicare tax on income above $200,000 (single filers) or $250,000 (married filing jointly).

If you are self-employed, you pay both the employee and employer portions yourself. This means you pay 12.4% for Social Security (up to the wage base) and 2.9% for Medicare, totaling 15.3% of your net self-employment income. You can deduct half of this amount when you file your taxes.

The difference between FICA and income tax

FICA and federal income tax are separate deductions that appear on your pay stub. FICA funds Social Security and Medicare specifically. Federal income tax funds the general operations of the federal government — defense, infrastructure, federal agencies, and other government programs.

The two are calculated differently. FICA is a flat percentage with a wage cap for Social Security. Federal income tax is progressive, meaning the rate increases as your income rises, and it has no wage cap. You can also adjust how much federal income tax is withheld by changing your W-4 form with your employer, but you cannot change how much FICA is withheld — it is set by law.

Some states also collect state income tax, which is a third separate deduction. FICA, federal income tax, and state income tax all appear as line items on your pay stub.

What happens to the money you pay into FICA

FICA taxes are held in two trust funds: the Social Security Trust Fund and the Medicare Trust Fund. The money does not sit in an account with your name on it. Instead, current FICA taxes pay benefits to people who are retired, disabled, or receiving survivor benefits right now.

When you retire, your Social Security benefit is calculated based on your earnings history — specifically, your 35 highest-earning years. The amount you receive depends on when you claim, not on how much you paid in. Someone who earned less but worked longer may receive the same or more than someone who earned more but worked fewer years.

Medicare Part A (hospital insurance) works similarly. Once you turn 65 and are covered by Medicare, your Part A benefits are funded by current FICA taxes from working people. You do not need to have paid a specific amount to receive coverage — you are covered if you or your spouse paid Medicare tax for at least 10 years.

FICA withholding for different types of workers

Most W-2 employees have FICA withheld automatically by their employer. The employer is responsible for sending the withheld amount to the IRS. If you have multiple jobs, FICA is withheld from each paycheck separately, and you could end up overpaying if your combined income exceeds the Social Security wage base. You can claim a refund of the overpayment when you file your taxes.

Self-employed people and independent contractors must pay FICA taxes themselves through quarterly estimated tax payments or when they file their annual tax return. They report self-employment income on Schedule C and calculate FICA taxes on Schedule SE. Unlike W-2 employees, self-employed workers do not have an employer to split the cost.

Some government employees, railroad workers, and clergy may be exempt from FICA or subject to different rules. If you fall into one of these categories, check with your employer or the IRS to understand your specific withholding obligations.

Why FICA exists and how it has changed

FICA was created in 1935 as part of the Social Security Act during the Great Depression. The original purpose was to provide a safety net for retired workers and their families. Medicare was added to FICA in 1965 to provide hospital insurance for people over 65.

The FICA tax rate and wage base have changed many times since 1935. When Social Security began, the combined employee and employer rate was 2% on the first $3,000 of income. Today it is 15.3% on income up to $168,600 for Social Security, plus unlimited Medicare tax. These increases reflect both the expansion of benefits and demographic changes — there are now fewer working people per retiree than there were in 1935.

The Social Security Trust Fund and Medicare Trust Fund face long-term funding challenges. Demographic trends mean more people are retiring and living longer, while the working-age population is growing more slowly. Congress periodically debates whether to raise the wage base, increase the tax rate, reduce benefits, or change the program structure, but no major changes have been enacted since 1983.

Frequently Asked Questions

Can I opt out of paying FICA taxes?

No. FICA taxes are mandatory for all W-2 employees and self-employed people unless you fall into a specific exemption category. Some religious groups and certain government employees may be exempt, but most workers cannot opt out. The only way to reduce FICA withholding is to earn less income.

What if I did not pay FICA taxes for some years?

Your Social Security benefit is based on your 35 highest-earning years. If you have years with zero income or low income, those years are included in the calculation and lower your average. You cannot go back and pay FICA taxes for past years to increase your benefit, but you can check your earnings record on the Social Security website to see what years are counted.

Do I get FICA taxes back if I do not claim Social Security or Medicare?

No. FICA taxes are not refundable. Even if you never claim Social Security or Medicare benefits, the money you paid in goes to the trust funds to pay current beneficiaries. If you die before claiming Social Security, your family may be may have access to to survivor benefits, but you do not receive a refund of your contributions.

Why is FICA withheld if I am not retired yet?

FICA taxes fund current retirees and disabled workers right now, not a personal retirement account for you. The system is pay-as-you-go: current workers fund current beneficiaries. When you retire, future workers' FICA taxes will fund your benefits. This is why FICA is mandatory — the system depends on continuous contributions from all working people.

Does FICA apply to all income?

FICA applies to wages, salaries, and self-employment income. It does not apply to investment income, capital gains, rental income (unless you are in the rental business), or most other types of income. This is why high earners often pay a lower FICA rate as a percentage of total income — much of their income comes from sources other than wages.