Yes, you pay Social Security tax on most income you earn

Social Security tax is taken directly from your paycheck if you work as an employee. Your employer also pays an equal amount on your behalf. If you're self-employed, you pay both the employee and employer portions yourself. The tax funds current Social Security benefits for retirees, disabled workers, and survivors of deceased workers.

The rate is fixed by federal law. As of 2024, you pay 6.2% of your wages up to a certain income limit, and your employer pays another 6.2%. Self-employed workers pay 12.4% total on net earnings from self-employment. The income limit changes each year — it was $168,600 in 2024 — so once your earnings exceed that amount in a calendar year, no more Social Security tax is withheld from additional income.

Not all work is subject to Social Security tax. Federal employees hired before 1984, railroad workers covered by the Railroad Retirement Act, and certain religious groups with exemptions do not pay into Social Security. Most other workers — including part-time employees, gig workers, and household employees earning above a threshold — do pay the tax.

Key Takeaways

  • Social Security tax is 6.2% of your wages as an employee, plus 6.2% paid by your employer, up to an annual income limit that changes each year.
  • Self-employed workers pay 12.4% of net self-employment income, which you calculate on Schedule SE when you file taxes.
  • Once your earnings reach the annual income limit, no more Social Security tax is withheld for the rest of that calendar year.
  • Your Social Security tax payments create a record of earnings that determines your future benefit amount if you become disabled, retire, or die.

How Social Security tax appears on your paycheck

Your employer withholds Social Security tax before you receive your pay. On a pay stub, it usually appears as "FICA" or "OASDI" (Old-Age, Survivors, and Disability Insurance). The line shows 6.2% of your gross wages for that pay period, up to the annual limit.

If you change jobs during the year, each employer withholds Social Security tax separately. It's possible to overpay if you work for multiple employers and your combined earnings exceed the annual limit. When you file your federal tax return using Form 1040, you can claim a refund for any excess Social Security tax withheld. The IRS processes this refund when you file, usually within weeks if you file electronically.

Your employer also withholds federal income tax and Medicare tax (1.45%) from the same paycheck. These are separate from Social Security tax, though they appear on the same stub. Some states and cities also withhold state and local income tax.

The annual income limit and how it works

Social Security tax only applies to earnings below an annual threshold. In 2024, that limit was $168,600. Earnings above that amount are not subject to Social Security tax, though they are still subject to Medicare tax and federal income tax.

The limit increases most years based on a formula tied to national wage growth. The Social Security Administration announces the new limit each October for the following year. If you earn $200,000 in a year, you pay Social Security tax only on the first $168,600 (using 2024 figures), which equals $10,453.20. The remaining $31,400 is not subject to Social Security tax.

This limit applies to W-2 wages only. If you have both W-2 income and self-employment income, you calculate Social Security tax on the combined total, but still only up to the annual limit. The calculation is more complex for self-employed workers because you must first subtract half of your self-employment tax before explore the limit.

Self-employment and Social Security tax

If you're self-employed, you pay Social Security tax through self-employment tax, calculated on Schedule SE of your tax return. You pay 12.4% on net self-employment income (your business income minus business expenses) up to the annual limit, plus 2.9% Medicare tax on all net self-employment income with no limit.

You can deduct half of your self-employment tax as an adjustment to income on your tax return, which lowers your taxable income. This deduction roughly mirrors the fact that employees don't pay tax on the employer portion their employer pays. Self-employment tax is due when you file your tax return, though if you expect to owe more than a certain amount, you may need to make quarterly estimated tax payments throughout the year.

Gig workers, freelancers, and anyone with net earnings of $400 or more from self-employment must file Schedule SE and pay self-employment tax, even if they have no other tax filing requirement. Losses in one year reduce your self-employment income in that year but do not create a carryover to reduce self-employment tax in future years.

Who does not pay Social Security tax

Federal employees hired before January 1, 1984, pay into the Civil Service Retirement System instead of Social Security and do not pay Social Security tax on their federal wages. Employees hired after that date pay Social Security tax like other workers.

Railroad workers covered by the Railroad Retirement Act pay railroad retirement tax instead. Members of certain religious groups that have filed for and received an exemption from Social Security do not pay the tax, though they must meet specific criteria and file Form 4029 with the IRS.

Nonresident aliens on certain visa types (such as F-1 students or J-1 exchange visitors) may be exempt from Social Security tax on wages earned in the United States, depending on the visa category and tax treaty between the United States and their home country. State and local government employees hired before specific dates in some states also have different arrangements, though most state and local workers now pay Social Security tax.

How your Social Security tax payments affect your future benefits

Every dollar of Social Security tax you pay creates a record of earnings in your Social Security account. The Social Security Administration tracks your earnings history under your Social Security number. When you reach retirement age, become disabled, or die, your benefit amount is calculated based on your 35 highest-earning years.

You need 40 work credits to be covered for retirement benefits. In 2024, you earn one credit for each $1,730 of wages (the amount changes yearly), and you can earn up to four credits per year. This means you need about 10 years of work history to be covered for retirement, though you may be covered for disability or survivor benefits with fewer credits.

If you have years with no earnings or very low earnings, those years still count toward your 35-year average, which lowers your benefit amount. Working additional years with higher earnings can replace lower-earning years and increase your future benefit. You can view your earnings record and estimated benefits by creating an account at ssa.gov.

Frequently Asked Questions

What happens if I work part-time — do I still pay Social Security tax?

Yes. Part-time employees pay Social Security tax at the same 6.2% rate as full-time employees, calculated on gross wages. Your employer withholds it the same way. The only difference is that your total annual earnings may not reach the income limit, so you pay tax on all your part-time wages for the year.

Can I opt out of paying Social Security tax?

No, with very limited exceptions. If you are a U.S. citizen or resident alien working in the United States, you must pay Social Security tax on covered wages. The only way to avoid it is to fall into one of the exempt categories — federal employees hired before 1984, railroad workers, or members of certain religious groups with approved exemptions.

If I overpay Social Security tax by working multiple jobs, how do I get the refund?

File your federal tax return on Form 1040. The IRS automatically calculates any excess Social Security tax withheld and includes it in your refund. You do not need to claim it separately. If you file electronically, the refund typically arrives within three weeks.

Does Social Security tax explore to bonuses and commissions?

Yes. Bonuses, commissions, and other forms of compensation are subject to Social Security tax up to the annual limit. Your employer withholds Social Security tax on these payments the same way as regular wages. If a bonus pushes you over the annual limit, no Social Security tax is withheld on the portion above the limit.

What is the difference between Social Security tax and Medicare tax?

Social Security tax is 6.2% (or 12.4% for self-employed) and funds retirement, disability, and survivor benefits. Medicare tax is 1.45% (or 2.9% for self-employed) and funds hospital insurance. Both are withheld from paychecks, but they fund separate programs and have different rules. Medicare tax has no annual income limit.