Social Security tax is 6.2% of your gross wages, taken from your paycheck by your employer
The Social Security tax rate is set by federal law and does not change based on your income or filing status. You pay 6.2% of your wages up to a yearly earnings cap. Your employer also pays 6.2% on your behalf — that is a separate 6.2%, not shared with you. Together, the employee and employer portions fund the Social Security trust fund.
The earnings cap changes each year. In 2024, you pay Social Security tax only on the first $168,600 of your annual wages. Once you earn above that amount in a calendar year, no more Social Security tax is withheld from your paychecks for the rest of that year. Self-employed people pay both the employee and employer portions (12.4% total) on their net business income, also up to the yearly cap.
Key Takeaways
- Social Security tax is 6.2% of your wages, withheld automatically from each paycheck.
- Your employer pays an additional 6.2% on your behalf; this does not reduce your own 6.2% payment.
- The tax applies only to wages below the yearly earnings cap, which is $168,600 in 2024 and increases most years.
- Self-employed workers pay 12.4% total (both employee and employer portions) on net business income.
- Social Security tax funds retirement, disability, and survivor benefits — it is separate from income tax withholding.
Where the 6.2% appears on your pay stub
Your pay stub shows the deduction as "Social Security" or "OASDI" (Old-Age, Survivors, and Disability Insurance). The amount is calculated on your gross pay before income tax is withheld. If you earn $2,000 in a pay period, the Social Security tax is $124 (6.2% of $2,000), and that $124 is deducted from your paycheck.
This deduction is mandatory — you cannot opt out or reduce it. It is separate from federal income tax withholding, Medicare tax (1.45%), and any state or local taxes. All three come out of the same paycheck, which is why your take-home pay is often much lower than your gross pay.
How the yearly earnings cap works
Once you have earned $168,600 in 2024 (the cap for that year), your employer stops withholding Social Security tax from your remaining paychecks for the rest of the calendar year. If you change jobs mid-year and your new employer does not know your total earnings at the previous job, you might overpay Social Security tax. You can claim the overpayment as a credit on your federal tax return.
The earnings cap is adjusted each year based on wage growth. It typically increases by a few hundred dollars annually, though the exact amount depends on national wage trends. The Social Security Administration announces the new cap in October for the following year.
Self-employed Social Security tax
If you are self-employed, you pay both the employee and employer portions of Social Security tax — 12.4% total — on your net business income. You calculate this on Schedule SE (Self-Employment Tax) when you file your federal tax return. The calculation is based on your net profit after business expenses, not your gross revenue.
Self-employed workers also pay the same yearly earnings cap. If your net business income is $168,600 or less in 2024, you pay 12.4% on all of it. If your net income exceeds the cap, you pay 12.4% only on the first $168,600. You can deduct half of your self-employment tax as a business expense on your tax return, which reduces your taxable income.
Why Social Security tax is separate from income tax
Social Security tax funds a specific program — retirement, disability, and survivor benefits — and is held in a separate trust fund. Income tax goes to the general Treasury and funds federal operations. Medicare tax (1.45% employee, 1.45% employer) funds Medicare and is also separate. These three withholdings are calculated independently and appear as separate line items on your pay stub.
Because Social Security tax has an earnings cap and income tax does not, high earners pay a smaller percentage of their total income in Social Security tax than lower-wage workers do. A person earning $500,000 pays 6.2% only on the first $168,600 of that income, while a person earning $50,000 pays 6.2% on all $50,000.
What happens if you work multiple jobs
If you hold two or more jobs in the same year, each employer withholds 6.2% Social Security tax independently. You could overpay if your combined earnings from all jobs exceed the yearly cap. For example, if you earn $100,000 at one job and $80,000 at another, your total is $180,000 — above the 2024 cap of $168,600. You would overpay by $744 (6.2% of the $12,000 over the cap).
You recover the overpayment by claiming it on your federal tax return. File Form 1040 and enter the overpaid amount on the line for excess Social Security tax. The IRS will refund it or apply it to other taxes owed.
Frequently Asked Questions
Does Social Security tax apply to all types of income?
No. Social Security tax applies only to wages from employment and net self-employment income. It does not apply to investment income, interest, dividends, rental income, or retirement account withdrawals. Some government employees hired before 1984 do not pay Social Security tax at all.
Can I reduce my Social Security tax by contributing to a 401(k)?
No. Social Security tax is calculated on your gross wages before any 401(k) contributions are made. Contributing to a 401(k) reduces your federal income tax and Medicare tax, but not Social Security tax. The 6.2% is withheld on your full salary.
What if I did not pay Social Security tax for a year?
If you were self-employed and did not file a tax return, you may have missed paying self-employment tax. The Social Security Administration can still credit you for earnings if you file a return later, but there are time limits. Contact the SSA or a tax professional to discuss your situation.
Is the 6.2% rate the same for everyone?
Yes, the employee rate is 6.2% for all workers. The employer also pays 6.2%. The only variation is the yearly earnings cap, which applies equally to all workers — once you reach it, no more is withheld that year, regardless of income level.