How much payroll tax you pay depends on your income and filing status

Payroll taxes are not a flat amount — they're a percentage of your gross pay that changes based on how much you earn. The federal income tax withheld from your paycheck varies by your salary, the number of dependents you claim, and whether you're single, married, or head of household. Social Security tax is 6.2% of your wages up to a yearly cap (the cap changes annually), and Medicare tax is 1.45% of all your wages with no cap. If you earn over a certain threshold — roughly $200,000 for single filers, higher for married filers — an additional 0.9% Medicare tax applies.

Your employer also pays matching taxes on your behalf: 6.2% for Social Security and 1.45% for Medicare. These employer contributions don't come out of your paycheck, but they're part of your total compensation cost. State and local income taxes, where they exist, add another layer that varies widely by location.

Key Takeaways

  • Federal income tax withheld from your pay is based on your salary, filing status, and the W-4 form you submit to your employer.
  • Social Security tax is 6.2% of wages up to an annual cap that changes each year, and Medicare tax is 1.45% of all wages with no yearly limit.
  • Your employer pays an equal amount in matching Social Security and Medicare taxes, though this money doesn't appear on your paycheck.
  • State and local income taxes vary by where you live and work, ranging from zero in some states to over 10% in others.
  • Self-employed workers pay both the employee and employer share of Social Security and Medicare taxes, totaling 15.3% combined.

Federal income tax withholding and how it's calculated

Your employer uses the W-4 form you fill out when you're hired to determine how much federal income tax to withhold from each paycheck. The W-4 asks for your filing status, number of dependents, and whether you have other income or jobs. The IRS publishes withholding tables that your payroll department uses to calculate the amount based on your gross pay and the information on your W-4.

The withholding is an estimate — it's meant to get you close to what you'll actually owe when you file your tax return in April. If too much is withheld, you get a refund. If too little is withheld, you owe money. You can adjust your W-4 at any time during the year if your situation changes, such as getting married, having a child, or taking a second job.

Social Security and Medicare taxes: the fixed percentages

Social Security and Medicare taxes are simpler than federal income tax because they're flat percentages. Social Security tax is 6.2% of your wages, but only up to a maximum amount each year — in 2024, that cap was $168,600 of earnings. Once you've earned that much in a calendar year, no more Social Security tax is withheld from your remaining paychecks. This cap increases most years to account for wage growth.

Medicare tax has no cap. You pay 1.45% on every dollar you earn, no matter how much that is. If your income exceeds $200,000 (single) or $250,000 (married filing jointly), you also pay an additional 0.9% Medicare tax on the amount over that threshold. This additional tax was introduced in 2013 and applies to both employees and self-employed workers.

What your employer pays on your behalf

Your employer matches your Social Security and Medicare contributions dollar-for-dollar. If you pay 6.2% in Social Security tax, your employer pays another 6.2%. If you pay 1.45% in Medicare tax, your employer pays another 1.45%. These employer contributions are not deducted from your paycheck — they're a separate cost to your employer.

This is why your total compensation (what you actually cost your employer) is higher than your take-home pay. If you earn $50,000 a year, your employer is paying roughly $53,830 in total compensation when you add in the employer's share of payroll taxes and any benefits. Understanding this distinction matters if you're self-employed, because you have to pay both shares yourself.

State and local income taxes vary by location

Some states have no income tax at all — Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, and Wyoming don't tax wages. Other states tax income at rates ranging from roughly 1% to over 13%, depending on your income level. A few states use a flat tax rate regardless of how much you earn, while most use a progressive system with higher rates for higher earners.

Local taxes add another layer in some cities and counties. New York City, for example, has a local income tax on top of state and federal taxes. Philadelphia, Columbus, and Kansas City also impose local income taxes. Your payroll department withholds these based on where you work, not where you live, though some states have reciprocal agreements that adjust this.

How self-employed workers calculate payroll taxes

If you're self-employed, you pay both the employee and employer share of Social Security and Medicare taxes. That's 12.4% for Social Security (up to the annual cap) and 2.9% for Medicare, totaling 15.3% before any federal income tax. You also pay an additional 0.9% Medicare tax if your net self-employment income exceeds the thresholds mentioned earlier.

Self-employed workers pay these taxes quarterly using Form 1040-ES, or they can pay them when they file their annual tax return. You can deduct half of your self-employment tax when calculating your adjusted gross income, which provides some tax relief. Many self-employed people work with an accountant to make sure they're setting aside enough money throughout the year.

What happens if you have multiple jobs

If you work two or more jobs, each employer withholds federal income tax and payroll taxes based on the W-4 you give them. This can result in under-withholding if your combined income from all jobs is higher than what each employer assumes. For example, if you earn $40,000 at Job A and $40,000 at Job B, each employer might withhold as if you're a single earner making $40,000, when you're actually making $80,000.

To fix this, you can adjust your W-4 at one or both jobs to increase the withholding, or you can make additional payments when you file your tax return. The Social Security tax cap still applies across all jobs — once you've earned the maximum in a year, no more Social Security tax is withheld from any job. Medicare tax, however, continues to be withheld from all jobs with no limit.

Frequently Asked Questions

Why is my paycheck smaller than I expected?

Your paycheck is reduced by federal income tax withholding, Social Security tax (6.2%), Medicare tax (1.45%), and any state or local income taxes. If you have benefits like health insurance or retirement contributions, those also reduce your take-home pay. Your gross pay is what you earn before these deductions; your net pay is what you actually receive.

Can I get out of paying payroll taxes?

No. Payroll taxes are mandatory for all employees and self-employed workers. Some religious groups have exemptions from Social Security and Medicare taxes if they meet specific IRS criteria, but these are rare and require formal approval. Federal income tax withholding is also mandatory unless you meet very specific conditions for claiming exemption on your W-4.

What's the difference between gross pay and net pay?

Gross pay is your total earnings before any deductions. Net pay is what's left after payroll taxes, income tax withholding, and any other deductions like health insurance or retirement contributions are removed. If you earn $3,000 gross and $600 is withheld for taxes and benefits, your net pay is $2,400.

Do I get back the payroll taxes I paid?

Social Security and Medicare taxes fund those programs and are not refundable — they go toward your future benefits or current beneficiaries. Federal income tax withholding may result in a refund if too much was withheld, or you may owe if too little was withheld. This is settled when you file your tax return each year.

How do I know if the right amount is being withheld?

You can use the IRS Withholding Calculator on the IRS website to estimate whether your withholding is correct. If you expect a large refund or to owe money, adjust your W-4 with your employer. You can change your W-4 as many times as needed during the year if your situation changes.