FICA is a payroll tax that funds Social Security and Medicare, taken directly from your paycheck
FICA stands for the Federal Insurance Contributions Act. It is not income tax — it is a separate tax that appears as its own line on your paystub. FICA funds two programs: Social Security (the retirement and disability insurance system) and Medicare (the health insurance program for people 65 and older, and some younger people with disabilities). Your employer withholds FICA from your gross pay before you see your paycheck, and your employer also contributes an equal amount on your behalf.
The reason FICA appears separately from federal income tax is that it works differently. Income tax is progressive — the more you earn, the higher your tax rate. FICA is a flat percentage applied to all wages up to a cap. Income tax money goes into the general Treasury. FICA money goes into dedicated trust funds for Social Security and Medicare, and your contributions are recorded in your individual account, which determines what you receive later.
Key Takeaways
- FICA has two parts: 6.2% for Social Security and 1.45% for Medicare, totaling 7.65% of your wages, with your employer paying an equal amount.
- Social Security tax stops once you reach the annual wage cap (which changes each year), but Medicare tax continues on all wages with no cap.
- Self-employed people pay both the employee and employer portions of FICA, totaling 15.3%, through self-employment tax on Schedule SE.
- FICA contributions are recorded under your Social Security number and determine your future Social Security benefits and Medicare coverage.
- You cannot opt out of FICA if you are a W-2 employee, but certain groups like some religious communities and nonresident aliens may have exemptions.
How the two parts of FICA work differently
Social Security tax is 6.2% of your wages. In 2024, this tax stops once you earn $168,600 in a calendar year — this is called the wage base. Once you hit that amount, no more Social Security tax is withheld from your remaining paychecks that year. This cap changes annually. The money funds retirement benefits, survivor benefits (paid to your family if you die), and disability benefits.
Medicare tax is 1.45% of all your wages, with no annual cap. Every dollar you earn is subject to Medicare tax, no matter how much you make. This funds hospital insurance (Part A) and is the foundation of Medicare coverage. There is also an additional Medicare tax of 0.9% on wages above $200,000 (single filers) or $250,000 (married filing jointly), which was added in 2013. This additional tax is withheld only on the amount above the threshold.
Together, the base FICA rate is 7.65% (6.2% + 1.45%). Your employer withholds this from your paycheck and also pays an equal 7.65% on your behalf — you do not see that employer portion, but it is part of your total compensation cost to the company.
Why FICA appears separately on your paystub
Your paystub typically shows federal income tax withholding and FICA withholding as separate line items because they serve different purposes and are calculated differently. Federal income tax is based on the W-4 form you fill out, which accounts for your filing status, dependents, and other income. The amount withheld can vary widely depending on your circumstances. FICA, by contrast, is automatic and the same percentage for everyone (up to the Social Security wage cap).
The separation also matters at tax time. When you file your Form 1040, you report all income and calculate your total federal income tax owed. FICA taxes are already withheld and are not recalculated — they straightforward appear on your return as taxes paid. If you overpaid income tax, you get a refund. FICA does not work that way; it is credited to your Social Security and Medicare accounts regardless of whether you owed income tax.
What happens if you are self-employed
If you are self-employed (a sole proprietor, freelancer, or partner), you pay both the employee and employer portions of FICA yourself. This is called self-employment tax, and it totals 15.3% of your net business income. You calculate it on Schedule SE and report it on your Form 1040. You can deduct half of your self-employment tax as an adjustment to income, which reduces your taxable income slightly.
Self-employed people must make quarterly estimated tax payments if they expect to owe $1,000 or more in federal income tax and self-employment tax combined. These are due April 15, June 15, September 15, and January 15 of the following year. Self-employment tax is still recorded under your Social Security number and counts toward your future Social Security and Medicare benefits in the same way as W-2 wages do.
How FICA contributions affect your future benefits
Every dollar of FICA you pay is recorded by the Social Security Administration under your Social Security number. Social Security benefits are based on your highest 35 years of earnings, adjusted for inflation. The more you earn and contribute over your working life, the higher your retirement benefit will be. You must have at least 40 credits (roughly 10 years of work) to be may be able to access for retirement benefits.
Medicare coverage at age 65 is also tied to your FICA contributions. If you or your spouse paid Medicare tax for at least 10 years, you are may have access to to Medicare Part A (hospital insurance) at no premium. If you did not work long enough, you can still buy into Medicare Part A, but you will pay a premium. Your Medicare tax contributions do not determine the amount of your benefits the way Social Security does — they determine whether you have access to the program.
Who does not pay FICA and why
Most workers pay FICA, but some groups are exempt. Members of certain religious communities that object to insurance on principle (such as the Amish and Mennonites) can request exemption from both Social Security and Medicare taxes using Form 4029. Once granted, the exemption is permanent and applies to all future wages. However, these individuals also cannot receive Social Security or Medicare benefits later.
Nonresident aliens on certain visa types (such as F-1 students or J-1 exchange visitors) are exempt from Social Security tax on wages earned in the United States, though they still pay Medicare tax. Some government employees hired before specific dates may be covered by alternative retirement systems instead of Social Security. If you think you might be exempt, check with your employer's payroll department or the Social Security Administration.
Frequently Asked Questions
Why do I pay FICA if I will not retire for decades?
FICA funds three programs, not just retirement: Social Security also pays disability benefits and survivor benefits to your family if you die. Additionally, your FICA contributions are recorded in your account, so you are building your own benefit record. You cannot opt out and receive a refund later — the tax is mandatory for all W-2 employees.
Can I get a refund of FICA taxes if I overpaid?
No. FICA taxes are not refundable like income tax can be. However, if you worked for multiple employers in the same year and overpaid Social Security tax (because each employer withheld up to the wage cap without knowing about your other jobs), you can claim the overpayment as a credit on your Form 1040. Medicare tax overpayment cannot be refunded.
What is the additional Medicare tax on my paystub?
If you earn above $200,000 (single) or $250,000 (married filing jointly), an extra 0.9% Medicare tax is withheld on the amount above the threshold. This was added in 2013 to help fund the Affordable Care Act. Unlike the base 1.45% Medicare tax, your employer does not contribute to the additional Medicare tax — you pay it entirely yourself.
Does FICA explore to all types of income?
FICA applies to wages and self-employment income. It does not explore to investment income, capital gains, interest, or dividends — those are subject to income tax only. If you have both W-2 wages and self-employment income, you pay FICA on both, but Social Security tax still stops once you reach the annual wage cap across all sources combined.