What Is FICA Tax and Why Do You Pay It?

FICA Is Two Taxes in One Line Item

FICA (Federal Insurance Contributions Act) is the line on your pay stub funding two federal programs: Social Security and Medicare. It's separate from federal income tax, calculated differently, and withheld regardless of your W-4 elections.

The Rate Breakdown

FICA totals 7.65% of your wages: 6.2% for Social Security and 1.45% for Medicare. Your employer withholds this from your paycheck and pays a matching 7.65% on top -- money you never see, but that's a real cost of employing you. Use the Payroll Tax Calculator to see this breakdown for your own pay.

The Social Security Wage Base Cap

Unlike Medicare, Social Security tax only applies up to an annual wage base cap -- once your year-to-date wages exceed that threshold, the 6.2% stops for the rest of the year (which is why some high earners notice their paycheck increase later in the year). Medicare's 1.45% has no cap and applies to all wages.

Self-Employed? You Pay Both Halves

If you're self-employed, there's no employer to split FICA with -- you pay the full 15.3% (both the employee and employer shares) as self-employment tax. See the Self-Employment Tax Calculator and the W-2 vs 1099 comparison guide.

What FICA Actually Funds

Social Security funds retirement, disability, and survivor benefits; Medicare funds health coverage for people 65+ and certain younger people with disabilities. The taxes you pay today fund current beneficiaries, not a personal account set aside just for you.

A Worked Example (Illustrative Numbers Only)

Suppose a hypothetical employee earns $2,000 in gross wages for a pay period. Social Security at 6.2 percent is $124, and Medicare at 1.45 percent is $29, so FICA withholding is $153, which equals 7.65 percent of $2,000. The employer also owes a matching $153 on its side. That $153 is separate from federal income tax withholding, which depends on the W-4 you filed. Looking at your own stub, you should be able to find the Social Security line and the Medicare line and see that they follow these percentages, unless your pay includes items that are treated differently.

Which Pay Counts as FICA Wages?

Most cash compensation counts: regular wages, overtime, bonuses, and commissions. Some deductions reduce income tax wages but not FICA wages, and others reduce both. For example, contributions to a traditional 401(k) generally lower your income tax wages but are still subject to FICA. Certain pre-tax benefits, such as some health insurance premiums paid through a cafeteria plan, can reduce FICA wages as well. Your payroll department or the IRS employer tax guidance can confirm how each item is treated.

The Additional Medicare Tax

Higher earners may owe an extra Medicare tax on wages above a threshold that depends on filing status. Employers begin withholding it once wages pass a set level, and you reconcile it on your tax return. Because the threshold is set by law, check the current IRS guidance on the Additional Medicare Tax instead of relying on a remembered number.

Why the Social Security Cap Matters for Timing

Because the Social Security portion stops once you reach the annual wage base, someone whose salary is well above the base will see their take-home pay rise late in the year. The wage base is adjusted periodically, so look up the current year's figure on the Social Security Administration website. If you switch employers mid-year, each employer may withhold Social Security tax separately up to the cap, and you can claim credit for any excess on your tax return.

FICA for Different Kinds of Workers

• Employees: split the tax with the employer, as described above.
• Self-employed workers: pay both halves through self-employment tax, and can generally deduct half of it when calculating adjusted gross income. Check current IRS instructions for the details.
• Household employees: families who hire a nanny or house cleaner above a set annual pay threshold may need to withhold and pay FICA. The threshold changes, so check the IRS guidance for household employers.
• Certain students and specific government or religious positions: narrow exemptions may apply.

Linking FICA to Your Future Benefits

Your Social Security benefit is based on your earnings record. Workers earn credits through covered work, and benefits depend on the highest-earning years of your career. It is worth creating an account on the Social Security Administration website to review your earnings history for errors. Missing or wrong earnings can reduce your future benefits, so a periodic check is a small habit with real value.

Common Mistakes

• Confusing FICA with federal income tax and assuming a W-4 change affects it.
• Forgetting that a raise or bonus increases FICA withholding too.
• Assuming freelance income is free of this tax because nothing is withheld.
• Ignoring the excess Social Security tax claim after working two jobs in a year.

When to Ask for Help

If your pay stub shows FICA amounts that do not match the percentages, ask payroll to explain. If you have multiple jobs, freelance income alongside a W-2 job, or household employees, a tax professional can help you avoid underpaying or overpaying.

Reading the Numbers on Your W-2

Your W-2 shows Social Security wages in Box 3, Social Security tax withheld in Box 4, Medicare wages in Box 5, and Medicare tax withheld in Box 6. These can differ from Box 1 wages because pre-tax retirement contributions reduce Box 1 but not the FICA boxes. If Box 3 stops at a round number lower than your total pay, that is the Social Security wage base in action. Comparing these boxes against your pay stubs is a quick way to catch payroll errors.

Frequently Asked Questions