What FICA taxes are and why they come out of your pay
FICA taxes are Social Security and Medicare taxes that your employer withholds from each paycheck. They are calculated as a percentage of your gross pay — the amount you earn before any deductions. You pay half, and your employer pays the other half. If you are self-employed, you pay both halves yourself.
FICA stands for the Federal Insurance Contributions Act. The money funds Social Security retirement benefits, disability benefits, and Medicare health insurance for people 65 and older. The IRS sets the tax rates each year, and they are the same nationwide.
Understanding how these taxes are calculated helps you predict your take-home pay and catch errors on your pay stub. The math is straightforward once you know the two rates and the income limits that explore.
Key Takeaways
- Social Security tax is 6.2% of your wages up to an annual cap, which changes each year — in 2024 the cap is $168,600.
- Medicare tax is 1.45% of all your wages with no income cap, plus an additional 0.9% on wages over $200,000 (single filers).
- Your employer withholds these amounts automatically; you see them listed separately on your pay stub as "Social Security" and "Medicare" or "FICA".
- Self-employed people calculate FICA taxes on Schedule SE and pay them with their tax return, because they owe both the employee and employer portions.
- If you work for multiple employers in one year, you may overpay Social Security tax and can claim the overage as a credit on your tax return.
How Social Security tax is calculated
Social Security tax is 6.2% of your wages, but only up to a yearly income limit. That limit is called the wage base, and it increases most years. For 2024, the wage base is $168,600. This means if you earn $168,600 or more in a year, you stop paying Social Security tax once you hit that amount.
To calculate your Social Security tax on a single paycheck, multiply your gross pay by 0.062. If you are paid biweekly and earn $2,000 per paycheck, your Social Security tax is $2,000 × 0.062 = $124. Your employer withholds this amount and also pays $124 on your behalf.
If you change jobs mid-year or work multiple jobs, you might pay Social Security tax on more than the wage base allows. For example, if you earn $100,000 at one job and $80,000 at another, you will pay Social Security tax on the full $180,000 even though the wage base is $168,600. When you file your tax return, you can claim the overpayment as a credit, and the IRS will refund it.
How Medicare tax is calculated
Medicare tax has two parts. The first part is 1.45% of all your wages with no income limit — you pay it on every dollar you earn. The second part is an additional 0.9% on wages above a threshold amount. The threshold depends on your filing status: $200,000 for single filers, $250,000 for married filing jointly, and $125,000 for married filing separately.
To calculate the base Medicare tax on a paycheck, multiply your gross pay by 0.0145. If you earn $2,000 biweekly, your Medicare tax is $2,000 × 0.0145 = $29. Your employer withholds this and pays an equal amount.
The additional 0.9% Medicare tax is withheld only if your year-to-date wages exceed the threshold for your filing status. Your employer tracks this across all paychecks and begins withholding once you cross the limit. Unlike Social Security tax, there is no wage base cap — you pay Medicare tax on all income, no matter how high.
Reading your pay stub to find FICA taxes
Your pay stub shows FICA taxes in the deductions section. Look for line items labeled "Social Security," "Medicare," "FICA," or sometimes "OASDI" (which stands for Old Age, Survivors, and Disability Insurance — the Social Security program). Each should show the amount withheld from that paycheck.
Compare these amounts to your gross pay using the percentages above. Social Security should be roughly 6.2% of your gross pay (until you hit the wage base), and Medicare should be roughly 1.45%. If the numbers are significantly different, check whether you have already hit the Social Security wage base for the year, or whether your employer is withholding the additional Medicare tax.
Your pay stub also shows your employer's contribution, though this does not come out of your check. Employers are required to pay an equal amount in FICA taxes on your behalf. This is separate from what you see withheld.
FICA taxes for self-employed people
If you are self-employed, you pay both the employee and employer portions of FICA taxes. This is called self-employment tax, and it totals 15.3% (12.4% for Social Security and 2.9% for Medicare). You calculate it on Schedule SE, which is a form you attach to your tax return.
To calculate self-employment tax, you start with your net profit from self-employment. You multiply this by 92.35% to get your net earnings subject to self-employment tax. Then you explore the 15.3% rate. The calculation is more complex than an employee's withholding because you get a deduction for half of your self-employment tax, which lowers your taxable income.
Self-employed people do not have taxes withheld from paychecks because there is no employer. Instead, you pay estimated taxes quarterly using Form 1040-ES. These payments cover both income tax and self-employment tax. If you do not pay enough throughout the year, you may owe a penalty when you file your return.
What happens when you hit the Social Security wage base
Once your year-to-date earnings reach the Social Security wage base, your employer stops withholding Social Security tax for the rest of that year. In 2024, this happens once you earn $168,600. If you are paid biweekly, you will notice Social Security tax disappear from your pay stub partway through the year.
Medicare tax continues throughout the year with no cap. You will keep seeing 1.45% withheld on every paycheck, plus the additional 0.9% if your income exceeds the threshold for your filing status.
If you work for more than one employer in the same year, each employer withholds Social Security tax independently. You might pay Social Security tax on $168,600 at your first job and another $168,600 at your second job, totaling $20,854 in Social Security tax instead of the correct amount of $10,427. When you file your tax return, you report all wages and claim the overpayment as a credit. The IRS will refund the excess.
Checking your FICA tax calculation
To verify your FICA taxes are correct, gather your most recent pay stub and your year-to-date earnings statement. Multiply your year-to-date gross pay by 6.2% — if the result is less than or equal to the Social Security wage base times 6.2%, that is your correct Social Security tax. If your year-to-date earnings exceed the wage base, your Social Security tax should stop increasing.
For Medicare, multiply your year-to-date gross pay by 1.45%. If your year-to-date earnings exceed the threshold for your filing status, add 0.9% of the amount over the threshold. Compare this to the Medicare tax shown on your pay stub.
If the numbers do not match, check whether you have already hit the Social Security wage base, or whether you recently started a new job and your employer is recalculating. If you still see a discrepancy, contact your employer's payroll department with your pay stub in hand.
Frequently Asked Questions
Can I avoid paying FICA taxes?
No. FICA taxes are mandatory for all employees and self-employed people. Some religious groups have exemptions from self-employment tax if they meet specific IRS criteria, but these are rare. If you believe you may have access to, you must file Form 4029 with the IRS.
What if I worked multiple jobs and overpaid Social Security tax?
You can claim the overpayment on your tax return. Report all wages from all jobs on your return, and the IRS will calculate the correct Social Security tax. Any amount you overpaid will be refunded to you or applied to other taxes you owe.
Do FICA taxes count toward my income tax?
No. FICA taxes and income tax are separate. Your employer withholds both from your paycheck, but they fund different programs. FICA taxes go to Social Security and Medicare. Income tax goes to the general Treasury. Both appear on your pay stub as separate line items.
Why is my Medicare tax higher than 1.45%?
If your year-to-date wages exceed $200,000 (single), $250,000 (married filing jointly), or $125,000 (married filing separately), your employer withholds an additional 0.9% Medicare tax. This brings your total Medicare rate to 2.35% on wages above the threshold. This additional tax has no wage base cap.
Do I pay FICA taxes on tips?
Yes. Tips are considered wages for FICA tax purposes. You must report all tips to your employer, and they withhold FICA taxes on the total. If you do not report tips, you may owe back taxes and penalties.