Federal Insurance Contribution Act (FICA)

What FICA means on your paycheck

FICA (the Federal Insurance Contributions Act) is a mandatory federal payroll tax that funds two programs: Social Security and Medicare. When you look at your pay stub and see a FICA deduction, that’s the amount withheld for those programs every pay period.

Every employee who earns wages pays it. Federal law requires your employer to withhold it, and no W-4 election or tax deductions change that. The line items on your pay stub may say “Social Security” and “Medicare” rather than “FICA.” Those are the two components of the same federal payroll tax.

Your deduction is only half your total contribution. Your employer pays an equal amount on your behalf. For every dollar withheld from your paycheck, another dollar comes from your employer. Your total FICA contribution is double what you see on your pay stub. Only your portion comes out of your net pay.

If you run payroll, SurePayroll By Paychex calculates both the employee and employer portions — so FICA withholding stays consistent every pay period.

What FICA pays for

Your FICA contributions fund two federal programs: Social Security program and Medicare. They connect directly to your work history and the income you earn.

Social Security covers three types of benefits

Retirement income: The Social Security Administration tracks your lifetime earnings and calculates your monthly payment based on your 35 highest-earning years. You need 40 credits (roughly 10 years of work) to qualify for Social Security benefits when you reach retirement age.

Disability insurance: If you become unable to work before retirement, Social Security pays a monthly benefit based on your earnings record.  

Survivor benefits: Your family may receive payments if you die while still covered.

Medicare covers healthcare starting at age 65

Your FICA contributions fund Part A hospital insurance, which carries no additional premium once you qualify for Medicare coverage. You can add Parts B, C, and D from there, covering medical services, supplemental plans, and prescriptions. Every year you work and pay FICA, you build toward Medicare eligibility. At 65, that eligibility becomes coverage.

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Who pays FICA

You pay 7.65% of your gross pay through payroll withholding. That’s the employee portion, the amount you see on your pay stub. Your employer contributes another 7.65% on your behalf. Combined, total FICA tax equals 15.3% of your taxable wages.

The employer portion doesn’t reduce your paycheck. It’s a separate employer cost on top of your gross wages. Your employer collects both the employee portion and employer portions and deposits the full 15.3% to the IRS on a set schedule.

Only your taxable wages count toward your Social Security benefit calculation. The employer match increases total funding to the Social Security program and Medicare programs. The Social Security Administration calculates your future benefit from what you earned, not from the combined total.

How FICA is calculated on your paycheck

Your FICA deduction splits into two line items on your pay stub:

Social Security tax: You pay a social security tax rate of 6.2% of your gross wages, up to the annual Social Security wage base of $184,500 for the 2026 tax year. Once your wages reach that wage base limit in a calendar year, Social Security withholding stops for the rest of the year.

Medicare tax: You pay a Medicare tax rate of 1.45% of all your wages with no cap. This portion applies to every dollar you earn, with no wage limit.

Total FICA tax rate: 7.65% (6.2% Social Security + 1.45% Medicare).

Example: If your gross pay for a pay period is $1,000, you pay $76.50 to FICA: $62 for Social Security and $14.50 for Medicare.

Additional Medicare tax: If your individual income exceeds $200,000 in a calendar year, an additional Medicare tax of 0.9% applies to wages above that threshold. Your employer withholds this additional tax once you cross that amount. There is no employer match for this portion. You pay the full 0.9%.

Use a payroll tax calculator to verify your own numbers against what you see on your stub.  

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FICA vs. federal income tax

FICA and federal income tax are separate taxes that both appear as deductions on your paycheck. They’re calculated differently and fund entirely different programs.

FICA is a flat contribution. You pay 7.65% of your taxable wages regardless of your filing status, income bracket, or tax deductions. Tax exemptions and W-4 elections have no effect on it. FICA goes directly to Social Security and Medicare trust funds and earns you specific future benefits: retirement income, disability insurance, and Medicare coverage.

Federal income tax is progressive. The rate rises with your taxable income and adjusts based on your filing status, deductions, and withholding elections on your W-4. It funds general federal government operations: defense, infrastructure, and education. It does not earn you any specific future benefit the way FICA does.

Both are mandatory. FICA is fixed and non-negotiable. Federal income tax is variable and adjustable. Updating your W-4 changes your federal income tax withholding. It does not affect your FICA tax liability or on your Social Security benefits.

How employers calculate and pay FICA

If you run payroll, you calculate FICA for each employee, withhold their 7.65% from their paycheck, contribute your matching 7.65%, and deposit both amounts to the IRS on schedule. You are accountable to the IRS for your calculations and your deposits.

Deposit schedule: The IRS assigns your deposit frequency (monthly or semi-weekly) based on your total tax liability from a prior lookback period. Your assigned schedule determines when FICA deposits are due after each pay period.

Quarterly reporting: You report all FICA taxes on Form 941 (Employer’s Quarterly Federal Tax Return) four times a year. Due dates for each tax year are generally April 30, July 31, October 31, and January 31. Dates may vary around holidays or weekends.  

Penalties for late deposits: Late deposits trigger IRS penalties that escalate based on how many days past due. Intentional non-payment can expose you to personal liability as a business owner.

S corporation owners paying themselves: If you operate as an S-corp and pay yourself a reasonable salary via W-2, you pay FICA on those wages, just like any other employee. You handle both the employee tax and the employer match on your own paycheck.

Contractors: You don’t withhold or match FICA for independent contractors. Self-employed workers pay self-employment tax directly to the IRS, covering both the employee and employer sides of the contribution.

SurePayroll calculates FICA, files Form 941 quarterly, and helps keep your payroll tax obligations on schedule.

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Payroll taxes filed, deposited, done

FICA withholding, employer match, quarterly 941s, federal and state tax deposits, SurePayroll calculates the full obligation and files on your schedule. You run payroll. We calculate the payroll taxes that comes with it.

See how it works

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