Payroll taxes take a percentage of your gross pay before you see it
Payroll taxes are deducted from your paycheck in two main parts: Social Security and Medicare. Together, these are called FICA taxes. Your employer also pays a matching amount on your behalf, though you do not see that money. The total you pay depends on your income and does not change based on how many dependents you have or your filing status.
As of 2024, you pay 6.2% of your gross wages to Social Security, up to a yearly income cap (the cap changes annually and was $168,600 in 2024). You pay 1.45% of all your gross wages to Medicare with no income limit. If you earn over $200,000 as a single filer or $250,000 as married filing jointly, you pay an additional 0.9% Medicare tax on the amount above that threshold. Your employer matches the Social Security and base Medicare percentages but not the additional Medicare tax.
Key Takeaways
- Social Security tax is 6.2% of your wages up to an annual cap; Medicare tax is 1.45% of all wages with no cap.
- Your employer pays an equal amount in matching taxes, which does not reduce your paycheck but funds the programs.
- High earners pay an extra 0.9% Medicare tax on income above $200,000 (single) or $250,000 (married filing jointly).
- Self-employed people pay both the employee and employer portions, totaling 15.3% for Social Security and Medicare combined.
- Payroll taxes fund Social Security retirement, disability, and survivor benefits, plus Medicare hospital insurance.
How much comes out of your paycheck each pay period
The amount deducted depends on your gross pay and how often you are paid. If you earn $3,000 per paycheck and are paid biweekly, you would see roughly $186 withheld for Social Security (6.2% of $3,000) and $43.50 for Medicare (1.45% of $3,000), totaling about $229.50 per paycheck. These numbers shift if your income crosses the Social Security wage cap or the Medicare threshold during the year.
Your pay stub shows these deductions separately as "Social Security" or "OASDI" (Old-Age, Survivors, and Disability Insurance) and "Medicare" or "Med." Some employers also list the employer match on your stub for informational purposes, though that money does not come from your paycheck. If you have multiple jobs, you may pay Social Security tax to the cap on each job separately, which means you could overpay; you would then claim a credit when you file your tax return.
What happens if you are self-employed
Self-employed people pay self-employment tax, which covers both the employee and employer portions of Social Security and Medicare. The rate is 15.3% total: 12.4% for Social Security (on income up to the annual cap) and 2.9% for Medicare (on all net self-employment income). You calculate this on Schedule SE and pay it along with your income tax, usually in quarterly estimated tax payments.
You can deduct half of your self-employment tax as an adjustment to income on your tax return, which reduces your taxable income slightly. If your net self-employment income is under $400, you do not owe self-employment tax, though you may still want to file to build Social Security credits. Self-employed people also pay the additional 0.9% Medicare tax if their income exceeds the thresholds mentioned above.
The Social Security wage cap and why it matters
Social Security tax only applies to wages up to an annual cap. Once you earn that amount in a calendar year, no more Social Security tax is withheld from your paycheck for the rest of the year. In 2024, the cap was $168,600; it increases most years based on wage growth. This means a person earning $200,000 per year pays Social Security tax only on the first $168,600, not on the full amount.
Medicare has no wage cap, so you pay 1.45% on every dollar you earn, no matter how high your income goes. The additional 0.9% Medicare tax for high earners also has no cap. This structure means higher earners pay a smaller percentage of their total income to Social Security but a larger percentage to Medicare than lower earners do.
How payroll taxes fund Social Security and Medicare
The Social Security tax you pay funds three programs: retirement benefits for workers age 62 and older, disability benefits for workers who cannot work, and survivor benefits for the families of deceased workers. The money does not sit in an account with your name on it; instead, current workers' taxes pay current beneficiaries' benefits. When you retire, future workers' taxes will pay your benefits.
Medicare tax funds hospital insurance (Part A), which covers inpatient hospital stays, skilled nursing, hospice, and some home health care. It does not fund Medicare Parts B, D, or supplemental coverage; those come from general tax revenue and beneficiary premiums. The Medicare trust fund operates on a similar pay-as-you-go basis as Social Security, though the funding structure differs.
Payroll taxes versus income tax withholding
Payroll taxes and income tax withholding are separate deductions on your paycheck. Payroll taxes (Social Security and Medicare) are fixed percentages that go to specific programs. Income tax withholding is based on the W-4 form you complete with your employer and depends on your filing status, dependents, and other income. You can adjust your W-4 to change how much income tax is withheld, but you cannot change your payroll tax rate.
Some people confuse the two because they both appear on the pay stub. Payroll taxes are mandatory and the same for everyone at the same income level. Income tax withholding varies by person and can be adjusted. When you file your tax return, you may get a refund of excess income tax withheld, but payroll taxes are not refundable—they are credits toward your future Social Security and Medicare benefits.
What to do if you think your payroll taxes are wrong
Check your pay stub against the rates listed above. If you see a deduction that does not match the current Social Security (6.2%) or Medicare (1.45%) rates, or if you were charged Social Security tax after reaching the annual cap, contact your employer's payroll department first. Most errors are simple mistakes in the payroll system and can be corrected quickly.
If your employer does not fix it, you can report the issue to the IRS using Form 8919 (Unclaimed Social Security and Medicare Tax) when you file your tax return. Keep copies of your pay stubs as proof. If you overpaid Social Security tax because you worked multiple jobs, you will claim the overpayment as a credit on your tax return; you do not need to report it separately unless your employer did not withhold correctly.
Frequently Asked Questions
Can I opt out of paying payroll taxes?
No. Payroll taxes are mandatory for all employees and self-employed people. The only exception is certain members of religious groups that have received an IRS exemption, which is rare and requires specific documentation. If you are an employee, your employer must withhold these taxes by law.
What if I did not work the whole year?
You pay payroll taxes only on the wages you actually earned. If you earned $80,000 in a year where you worked part of the time, you pay Social Security tax on $80,000 (assuming it is below the cap) and Medicare tax on the full amount. You do not owe taxes on income you did not receive.
Do I get money back from payroll taxes when I file my return?
Payroll taxes are not refundable in the way income tax can be. However, if you overpaid Social Security tax because you worked multiple jobs, you can claim the overpayment as a credit on your return. Medicare and Social Security taxes are credits toward your future benefits, not payments you recoup immediately.
Why do I pay more in taxes if I get a second job?
Each employer withholds Social Security tax up to the annual cap independently. If you earn $100,000 at one job and $80,000 at another, both employers will withhold Social Security tax on their full amounts, even though your combined income exceeds the cap. When you file your return, you claim a credit for the overpayment.
Are payroll taxes the same in every state?
Social Security and Medicare tax rates are federal and the same everywhere. Some states also have state income tax, which is separate from payroll taxes and varies by state. A few states have no income tax. Check your pay stub to see if state tax is being withheld in addition to federal payroll taxes.