The Social Security tax rate and how it's calculated
You pay 6.2 percent of your gross wages into Social Security, and your employer pays another 6.2 percent on your behalf. If you're self-employed, you pay both portions yourself — 12.4 percent total — though you can deduct half of it when you file taxes.
The tax applies only to earnings up to a certain limit, which changes each year. For 2024, that limit is $168,600. This means if you earn $200,000 a year, you only pay Social Security tax on the first $168,600. Income above that threshold is not subject to Social Security tax, though it may be subject to Medicare tax.
Your employer withholds the 6.2 percent automatically from each paycheck. You'll see it listed on your pay stub as "Social Security" or "OASDI" (Old-Age, Survivors, and Disability Insurance). The amount comes out before federal income tax is calculated, which means it reduces your taxable income slightly.
Key Takeaways
- You pay 6.2 percent of your wages to Social Security, and your employer pays an equal 6.2 percent, for a total of 12.4 percent of your earnings.
- The tax only applies to earnings below an annual cap, which was $168,600 in 2024 and increases most years based on wage growth.
- Self-employed workers pay the full 12.4 percent themselves but can deduct half of it as a business expense on their tax return.
- Social Security tax is withheld from your paycheck before income tax is calculated, so it slightly reduces the income subject to federal withholding.
- The money you pay in goes toward current retirees' benefits and your own future Social Security benefits, not into a personal account.
Why there's an earnings cap and what happens above it
Social Security was designed as an insurance program for workers of modest means, not as a way to replace all income for high earners. The earnings cap reflects that original purpose. In 2024, once you earn $168,600, no additional Social Security tax is taken from your paycheck for the rest of that year, no matter how much more you earn.
This cap increases most years. The Social Security Administration adjusts it based on the average wage index — essentially, how much wages grew nationally in the previous year. If wages grew 3 percent, the cap typically rises about 3 percent as well. You can find the current year's cap on the Social Security Administration website or on your employer's tax guidance.
High earners still pay Medicare tax on all income above the cap. Medicare tax is 1.45 percent for employees (2.9 percent for self-employed), with no earnings limit. Additionally, if your income exceeds certain thresholds — $200,000 for single filers, $250,000 for married filing jointly — you pay an extra 0.9 percent Medicare tax on the excess.
How self-employed workers calculate their Social Security tax
If you're self-employed, you pay Social Security tax on your net business income, not your gross revenue. You calculate this on Schedule SE (Self-Employment Tax), which you file with your Form 1040. The process has a few steps, but the math is straightforward once you know your net profit.
Start with your net profit from self-employment — your business income minus business expenses. Multiply that by 92.35 percent. This adjustment accounts for the fact that self-employed people can deduct half their self-employment tax as a business expense, which reduces their taxable income. Then multiply the result by 15.3 percent (12.4 percent for Social Security plus 2.9 percent for Medicare). The result is your total self-employment tax.
You pay this tax when you file your annual return, though if you expect to owe more than $1,000 in self-employment tax, you should make quarterly estimated tax payments throughout the year. On your tax return, you can deduct half of your self-employment tax, which lowers your adjusted gross income and reduces your income tax bill.
What happens when you reach the earnings cap mid-year
If you change jobs or receive a bonus that pushes you over the earnings cap partway through the year, you might overpay Social Security tax. This can happen if your first employer withheld Social Security tax on $168,600 and then your second employer also withheld it on $168,600, even though your combined earnings exceeded the cap.
When you file your tax return, the IRS will see the overpayment and refund it to you. You don't have to do anything special — the IRS calculates it automatically. If you're owed a refund of overpaid Social Security tax, it will be included in your overall refund or subtracted from any taxes you owe.
This situation is most common for people who were laid off or left a job partway through the year and found new work. Keep your pay stubs from both employers so you can verify the amounts if needed, though the IRS has access to the same information your employers reported.
How Social Security tax connects to your future benefits
The Social Security tax you pay now doesn't go into a personal account with your name on it. Instead, it funds benefits for current retirees, disabled workers, and survivors of deceased workers. Your own future Social Security benefits will be funded by workers paying Social Security tax after you retire.
Your benefit amount is based on your earnings history — specifically, your 35 highest-earning years. The Social Security Administration uses your reported earnings to calculate what you'll receive at full retirement age, which ranges from 66 to 67 depending on your birth year. If you claim benefits early (as early as age 62), your monthly payment is reduced. If you delay claiming past full retirement age, your payment increases.
You can view your earnings record and estimated benefits on your Social Security account at ssa.gov. The statement shows how much you've paid in Social Security tax over your lifetime and estimates what you might receive based on your current earnings trajectory.
State and local taxes on Social Security wages
Social Security tax is a federal tax only. Some states and cities have their own income taxes, but those are separate from Social Security tax and are calculated differently. Your employer withholds federal income tax, state income tax (if applicable), and local income tax (if applicable) in addition to Social Security tax.
A few states don't have income tax at all, so residents of those states pay only federal Social Security tax and Medicare tax on wages. Most states do tax wages, and the rate varies widely — from around 1 percent to over 13 percent depending on your income and state. This is separate from your Social Security obligation and doesn't affect your Social Security benefits.
Frequently Asked Questions
Does Social Security tax explore to all types of income?
Social Security tax applies to wages and self-employment income. It does not explore to investment income, rental income, interest, or dividends. Some types of employment are exempt — for example, certain government employees with their own pension systems and some religious workers — but most jobs are covered.
What if I work for multiple employers in the same year?
Each employer withholds Social Security tax based on what you earn from them, without knowing about your other jobs. If your combined earnings exceed the cap, you'll overpay. When you file your tax return, the IRS will refund the overpayment automatically — you don't need to claim it separately.
Can I opt out of paying Social Security tax?
No. Social Security tax is mandatory for all covered workers. The only exceptions are certain government employees, some religious groups with specific beliefs, and nonresident aliens in certain visa categories. If you're a regular employee or self-employed person, you must pay.
Does paying more Social Security tax mean I'll get a bigger benefit?
Paying more does increase your benefit, but only up to a point. Your benefit is based on your 35 highest-earning years. Once you've worked 35 years, additional earnings only increase your benefit if they're higher than one of your previous 35 years. There's also a maximum benefit amount, which changes yearly.
What happens to Social Security tax if I'm unemployed?
You don't pay Social Security tax on unemployment benefits. However, you may have paid Social Security tax on wages before you were laid off, and those earnings still count toward your future benefits. If you return to work, you'll resume paying Social Security tax on your new wages.