FICA is a separate payroll tax that funds Social Security and Medicare

FICA stands for Federal Insurance Contributions Act. It is not income tax — it is a dedicated payroll tax that your employer withholds from your paycheck and sends to the federal government. The money funds two specific programs: Social Security (retirement, disability, and survivor benefits) and Medicare (health insurance for people 65 and older, and some younger people with disabilities).

FICA appears as a line item on your pay stub separate from federal income tax withholding. You see it deducted twice: once as the employee portion (which comes from your paycheck) and once as the employer portion (which your employer pays directly to the government, though it reduces what you could otherwise earn). Self-employed people pay both portions themselves.

The reason FICA exists separately from income tax is that it is not a general revenue tax. The money you pay in is credited to your individual Social Security account, and your future benefits are calculated based on what you contributed. Medicare works similarly — your FICA payments toward Medicare are tracked and determine your may be able to access and premium structure later.

Key Takeaways

  • FICA has two parts: 6.2% for Social Security and 2.9% for Medicare, withheld from your paycheck as an employee, plus matching amounts your employer pays.
  • FICA is separate from federal income tax and funds specific programs, not general government spending.
  • Your FICA contributions are credited to your individual Social Security and Medicare accounts and affect your future benefits.
  • Self-employed people pay both the employee and employer portions of FICA, totaling 15.3% on net earnings from self-employment.
  • There is a wage cap on Social Security FICA (the amount changes yearly), but Medicare FICA has no cap and applies to all earnings.

How much FICA comes out of your paycheck

The employee portion of FICA is 15.3% of your gross wages, split into two parts: 6.2% for Social Security and 2.9% for Medicare. This is a fixed rate set by federal law and does not change based on your income level or filing status.

However, Social Security FICA only applies to earnings up to a certain threshold, which changes each year. In 2024, that threshold was $168,600 — meaning once you earn that much in a calendar year, no more Social Security tax is withheld from your paycheck for the rest of that year. Medicare FICA, by contrast, has no wage cap and applies to every dollar you earn. Additionally, if your income exceeds certain thresholds (which vary by filing status), you pay an extra 0.9% Medicare tax on the excess.

Your employer withholds these amounts automatically and sends them to the IRS along with their matching contribution. You do not have to calculate or submit FICA yourself — it happens on every paycheck.

Why Social Security and Medicare FICA are capped differently

Social Security FICA has a wage cap because Social Security is designed as an insurance program tied to your earnings history. The program replaces a percentage of your pre-retirement income, not a fixed dollar amount. Once you have earned enough in a year to max out your future benefit, additional earnings do not increase what you will receive, so the tax stops. This is why high earners stop paying Social Security tax partway through the year.

Medicare FICA has no cap because Medicare is a universal program for people 65 and older, regardless of how much they earned. The program is funded by contributions from all workers, and the cost of providing coverage does not stop at a certain income level. The extra 0.9% Medicare tax on high earners was added in 2013 to help fund the Affordable Care Act.

The result is that a person earning $50,000 pays FICA on all of it, while a person earning $500,000 pays Social Security FICA only on the first $168,600 (in 2024) but Medicare FICA on all $500,000 plus the additional 0.9% on the amount above the threshold.

FICA on your pay stub and tax return

Your pay stub shows FICA withholding in separate lines: one for Social Security (labeled "SS Tax" or "OASDI") and one for Medicare (labeled "Medicare Tax" or "Med Tax"). These amounts are withheld from your gross pay before your net pay is calculated, so they reduce the amount you take home.

On your annual tax return (Form 1040), FICA does not appear as a line item you calculate. Instead, your employer reports what was withheld on Form W-2, Box 4 (Social Security tax withheld) and Box 6 (Medicare tax withheld). You use these figures only if you are checking that your employer withheld the correct amount or if you are self-employed and need to calculate your own FICA liability.

FICA withholding is not refundable — you cannot get it back on your tax return the way you might get back excess income tax withholding. The money goes directly into the Social Security and Medicare trust funds. However, if your employer withheld too much (which can happen if you worked for multiple employers in one year), you can claim a credit on your return.

Self-employment FICA and Schedule SE

If you are self-employed, you pay both the employee and employer portions of FICA yourself, for a total of 15.3% on your net self-employment income. You calculate this on Schedule SE (Self-Employment Tax), which you file with your Form 1040.

Schedule SE walks you through calculating your net earnings from self-employment (your business income minus business expenses), then applies the FICA rates to determine what you owe. You then transfer this amount to your Form 1040 as self-employment tax. Unlike employees, you can deduct half of your self-employment tax as an adjustment to income, which slightly reduces your taxable income.

Self-employed people must pay FICA quarterly through estimated tax payments if they expect to owe more than a certain amount (usually $1,000). This is because there is no employer withholding, so the IRS expects payment throughout the year rather than in one lump sum at tax time.

FICA and your future Social Security and Medicare benefits

Every dollar of FICA you pay is credited to your Social Security account. The Social Security Administration tracks your earnings history and uses your 35 highest-earning years to calculate your retirement benefit. The more you earn and pay in FICA, the higher your future benefit will be — up to a maximum benefit amount that also changes yearly.

You can view your estimated benefits and earnings record on your Social Security account at ssa.gov. The statement shows how much you have paid in FICA over your lifetime and estimates what you will receive at different retirement ages. If you notice an error in your earnings record, you should report it to Social Security as soon as possible, because corrections become harder the further back the error goes.

For Medicare, your FICA contributions determine your may be able to access and premium structure. If you have paid Medicare FICA for at least 10 years (40 quarters), you are covered by Medicare Part A (hospital insurance) at no premium when you turn 65. If you have not paid enough, you can still enroll but will pay a higher premium.

FICA withholding mistakes and corrections

If your employer withholds the wrong amount of FICA, you should report it to your employer's payroll department first. Common errors include explore the wage cap incorrectly (especially if you changed jobs mid-year) or failing to withhold the additional Medicare tax on high earners.

If you worked for more than one employer in a year and each withheld Social Security FICA on earnings above the wage cap, you overpaid. You can claim a credit for the excess on your Form 1040 by entering the overpayment on line 24 (Other taxes). The IRS will refund it or explore it to other taxes you owe.

If you believe your employer is not withholding or paying FICA at all, you can report it to the IRS using Form 13909 (Information Referral). The IRS investigates and can assess penalties and back taxes against the employer.

Frequently Asked Questions

Why do I pay FICA if I will not retire for decades?

FICA funds not only retirement benefits but also disability insurance (if you become unable to work) and survivor benefits (if you die, your family may receive payments). Additionally, your FICA contributions are mandatory — they are part of the social insurance system, not optional savings. The money you pay now supports current retirees and disabled workers, and future workers will support you.

Can I opt out of paying FICA?

No. FICA is mandatory for all employees and self-employed people with net earnings above $400. The only exceptions are certain religious groups that have received IRS approval to be exempt from Social Security, and some government employees hired before specific dates who are covered by alternative pension systems.

What happens to my FICA if I change jobs?

Your FICA contributions follow you — they are credited to your Social Security account regardless of how many jobs you have. If you worked for multiple employers and each withheld Social Security FICA, you may have overpaid once you hit the wage cap. You can claim the excess on your tax return. Your earnings history is tracked by Social Security number, so all your jobs count toward your benefit calculation.

Does FICA explore to bonuses and overtime?

Yes. FICA applies to all wages and salaries, including bonuses, overtime, commissions, and most other forms of compensation. The only common exceptions are certain fringe benefits (like health insurance premiums your employer pays on your behalf) and contributions to may have access to retirement plans like a 401(k), which are withheld before FICA is calculated.

Why is my FICA withholding different from my coworker's if we earn the same?

If you and your coworker earn the same but have different FICA withholding, one of you likely hit the Social Security wage cap and the other did not. This happens most often mid-year for high earners. After the cap is reached, Social Security FICA stops but Medicare FICA continues. Also, if one of you is subject to the additional 0.9% Medicare tax and the other is not, your total FICA will differ.