Payroll taxes take 15.3% of your wages when you work as an employee, split between you and your employer

The total payroll tax rate is 15.3% of gross wages. Your employer pays half (7.65%) and you pay the other half (7.65%) through deductions from your paycheck. This 15.3% covers two separate taxes: Social Security and Medicare.

The breakdown is straightforward. Social Security takes 12.4% of your wages (6.2% from you, 6.2% from your employer). Medicare takes 2.9% (1.45% from you, 1.45% from your employer). If you earn over a certain threshold — $200,000 for single filers in 2024 — an additional 0.9% Medicare tax applies to your wages only, with no employer match.

What you see on your pay stub is only your half. If you earn $1,000 in a week, you will see roughly $92.35 deducted for payroll taxes (7.65%). Your employer sends an additional $92.35 to the IRS on your behalf, but that amount does not appear on your stub because it comes from the company's budget, not yours.

Key Takeaways

  • Employee payroll tax withholding is 7.65% of gross wages, but the total cost to your employer is 15.3% when you include their matching contribution.
  • Social Security tax is 6.2% on wages up to $168,600 in 2024, meaning high earners stop paying it partway through the year.
  • Medicare tax is 1.45% on all wages with no cap, plus an extra 0.9% for single filers earning over $200,000.
  • Self-employed workers pay the full 15.3% themselves because they are both employee and employer, though they can deduct half on their tax return.

Why Social Security and Medicare have different caps

Social Security has a wage base limit that changes each year. In 2024, you and your employer each stop paying Social Security tax once your wages hit $168,600. This means if you earn $200,000 in a year, you pay 6.2% on the first $168,600 only, not on the full amount.

Medicare has no wage cap. You pay 1.45% on every dollar you earn, no matter how much that is. This is why high earners pay a larger share of their income to Medicare than to Social Security — the Social Security portion maxes out, but Medicare keeps going.

The wage base limit for Social Security adjusts annually based on national wage growth. The IRS publishes the new limit each October for the following year. If you work multiple jobs or change employers mid-year, you might overpay Social Security tax, but you can claim a credit for the overage when you file your tax return.

How the additional Medicare tax affects higher earners

If you are a single filer earning over $200,000, or married filing jointly earning over $250,000, you owe an extra 0.9% Medicare tax on wages above those thresholds. This additional tax is withheld from your paycheck only — your employer does not match it.

Your employer is responsible for withholding this extra tax once your year-to-date wages cross the threshold. If you have multiple employers, each one withholds based only on what they pay you, which can result in overwithholding. You will need to reconcile this on your tax return using Form 8959.

What self-employed workers pay

If you are self-employed, you pay the full 15.3% yourself because you are both the employee and the employer. You calculate this on Schedule SE (Self-Employment Tax) and pay it along with your income tax, either through quarterly estimated tax payments or when you file your return.

The good news is that you can deduct half of your self-employment tax on your Form 1040. This reduces your taxable income, which lowers your income tax bill. The deduction is taken on line 20 of the 1040, and it does not require itemizing.

Self-employed workers also use Schedule SE to track which portion of their self-employment tax goes to Social Security and which goes to Medicare, because the Social Security portion still has the wage base limit. Once your net self-employment income hits the limit, the Social Security portion stops, but the Medicare portion continues.

How payroll taxes differ from income tax withholding

Payroll taxes and income tax withholding are two separate deductions from your paycheck. Payroll taxes (Social Security and Medicare) are fixed percentages that go to specific programs. Income tax withholding is based on your W-4 form and varies depending on how many dependents you claim and your filing status.

Payroll taxes are mandatory and the same for everyone at the same income level. Income tax withholding is customizable — you can adjust it by changing your W-4 with your employer. If you want less withheld, you claim more allowances; if you want more withheld, you claim fewer.

At the end of the year, your employer reports both on your W-2. Box 2 shows federal income tax withheld. Boxes 4 and 6 show Social Security and Medicare taxes withheld. When you file your return, you use these amounts to calculate whether you owe more tax or will receive a refund.

Payroll tax rates for different types of workers

Regular W-2 employees see 7.65% withheld from their paycheck, with the employer paying another 7.65%. Household employees (nannies, housekeepers, caregivers) are subject to the same rates if their employer meets certain thresholds, though many household employers underreport or skip these taxes entirely.

Agricultural workers and certain other categories have different rules. Railroad employees pay into the Railroad Retirement Tax Act system instead of Social Security and Medicare, with different rates and wage bases. If you work in one of these categories, your pay stub will show different tax codes.

Nonresident aliens and certain visa holders may have different withholding rules depending on their visa status and tax treaty between their home country and the United States. If this applies to you, your employer should have notified you during onboarding.

Frequently Asked Questions

Why do I pay payroll taxes if I will get Social Security later?

Payroll taxes fund current Social Security and Medicare benefits for retirees and disabled workers right now, not just your future benefits. Your contributions build a record that determines your benefit amount when you retire or become disabled. The system is pay-as-you-go, not a savings account.

Can I opt out of payroll taxes?

No. Payroll taxes are mandatory for all W-2 employees and self-employed workers. The only exceptions are certain religious groups that have received IRS approval to opt out, and some government employees in specific pension systems. If your employer is not withholding payroll taxes, report it to the IRS.

What happens if I overpay Social Security tax?

If you work multiple jobs or change employers and pay more than the annual maximum, you can claim a credit on your tax return. You will not receive a refund, but the overpayment reduces your income tax liability. File Form 1040 with Schedule 3 to claim the credit.

Do payroll taxes count toward my income tax?

No. Payroll taxes and income tax are separate. Payroll taxes fund Social Security and Medicare. Income tax funds general government operations. Both are withheld from your paycheck, but they go to different places and serve different purposes.

Why is my payroll tax different from my coworker's if we earn the same?

If you both earn the same gross amount, your payroll tax withholding should be identical. The difference you see might be in income tax withholding, which depends on your W-4 form, or in additional Medicare tax if one of you earns over the threshold. Check your pay stubs to see which line differs.