Social Security tax withheld is money taken from your pay to fund the Social Security program

When you see "Social Security tax" or "OASDI" on your pay stub, it means your employer is sending a portion of your wages to the federal Social Security trust fund. The amount withheld in 2024 is 6.2 percent of your gross pay, up to an annual earnings cap (which changes each year). Your employer also contributes an equal 6.2 percent on your behalf, though you do not see that amount deducted from your check.

This money funds three programs: retirement benefits for workers age 62 and older, disability benefits for workers who cannot work due to injury or illness, and survivor benefits for the families of workers who die. The tax is mandatory for almost all employees in the United States, and the amount you pay over your working years determines how much you can receive later.

Unlike income tax withholding, which varies based on your W-4 form, Social Security tax withholding is fixed by federal law. You cannot reduce it, defer it, or claim an exemption from it (with rare exceptions for certain religious groups and some government employees hired before 1984).

Key Takeaways

  • Social Security tax is 6.2 percent of your wages, withheld automatically from each paycheck, with your employer contributing an equal amount.
  • The tax stops once you reach the annual earnings cap, which means high earners pay the same total amount as the cap itself.
  • Your withholding record is tracked by your Social Security number and determines your future benefit amount.
  • Self-employed workers pay both the employee and employer portions (15.3 percent total) but can deduct half on their tax return.

How the earnings cap works

Social Security tax only applies to earnings below a certain threshold, called the wage base. In 2024, that cap is $168,600. If you earn $168,600 or more, you stop paying Social Security tax once you hit that amount for the year. If you earn $200,000, you pay the 6.2 percent tax only on the first $168,600, not on the remaining $31,400.

The cap increases most years based on wage growth in the economy. This means if you change jobs mid-year or work multiple jobs, you could temporarily pay more than the annual maximum if your employers do not coordinate. For example, if you earn $100,000 at one job and then switch to another job where you earn $80,000, you will pay Social Security tax on both amounts even though your total is $180,000. You can claim a credit on your tax return for the overpayment, but you have to file to get it back.

What happens to the money you pay

Social Security tax goes into two trust funds: the Old-Age and Survivors Insurance (OASI) fund and the Disability Insurance (DI) fund. These funds pay current beneficiaries their monthly checks. The program operates on a pay-as-you-go basis, meaning the taxes collected today pay for benefits distributed today, not for your own future benefits (though your record does determine what you will receive).

The Social Security Administration tracks your earnings record under your Social Security number. Every year, your employer reports your wages to the SSA. This record is used to calculate your benefit amount when you reach retirement age, become disabled, or if your family members become may be able to access for survivor benefits after your death. You can view your earnings record by creating an account at ssa.gov.

Self-employed workers and Social Security tax

If you are self-employed, you pay both the employee and employer portions of Social Security tax, totaling 15.3 percent (12.4 percent for Social Security, 2.9 percent for Medicare). This is called self-employment tax and is calculated on Schedule SE of your tax return. You pay it when you file your annual return, not through paycheck withholding.

The good news is that you can deduct half of your self-employment tax on your income tax return, which reduces your taxable income. You still pay the full amount, but the deduction lowers your overall tax burden. The earnings cap applies to self-employed income the same way it does to wages: you only pay Social Security tax on net self-employment income up to the annual limit.

How Social Security tax connects to your future benefits

The amount you pay in Social Security tax over your working years determines your benefit amount, but not in a direct one-to-one way. The Social Security Administration uses your 35 highest-earning years to calculate your Primary Insurance Amount (PIA), which is the basis for your monthly benefit. If you have fewer than 35 years of earnings, zeros are counted for the missing years, which lowers your average.

You need at least 40 credits of earnings to be covered by Social Security. In 2024, you earn one credit for each $1,730 of wages (up to four credits per year). Most people earn their 40 credits over 10 years of work. Once you have 40 credits, you are insured for retirement, disability, and survivor benefits for life, even if you never work again.

Checking your Social Security tax record

You should review your earnings record every few years to make sure your employer reported your wages correctly. Mistakes can happen, and correcting them is easier while you are still working. Visit ssa.gov/myaccount to create a free account and view your earnings history, estimated retirement benefit, and any other benefits you may be due.

If you spot an error, contact the Social Security Administration directly. You will need your pay stubs or W-2 forms as proof. The SSA can correct errors going back several years, but the sooner you report a mistake, the better. If you lost your Social Security card or need a replacement, you can request one through your online account or at your local Social Security office.

What happens if you work while receiving benefits

If you start receiving Social Security retirement benefits before your full retirement age and continue working, your benefits may be temporarily reduced. In 2024, Social Security reduces your benefit by $1 for every $2 you earn above $23,400 (the earnings limit changes annually). Once you reach your full retirement age, there is no earnings limit and no reduction, no matter how much you work.

You still pay Social Security tax on your wages even while receiving benefits. These additional earnings can increase your benefit amount if they are among your 35 highest-earning years, though the increase is usually small if you are already receiving benefits.

Frequently Asked Questions

Can I opt out of paying Social Security tax?

No, with very rare exceptions. Members of certain religious groups that oppose insurance (like some Amish and Mennonite communities) and some government employees hired before 1984 may be exempt. For nearly all workers, Social Security tax is mandatory and cannot be reduced or deferred.

What if my employer did not withhold Social Security tax?

Contact your employer when ready and ask them to correct the error. If they refuse or go out of business, contact the Social Security Administration at 1-800-772-1213. You are still responsible for the tax even if your employer did not withhold it, and the SSA can help you resolve the issue.

Does Social Security tax explore to all types of income?

No. Social Security tax applies to wages and self-employment income, but not to investment income, rental income, or most other sources. Some government employees and railroad workers have different rules. Check with a tax professional if you have income from multiple sources.

Will I get back the Social Security tax I paid if I move out of the country?

No. Social Security tax is not refundable. However, you may still be due benefits based on your earnings record, even if you live abroad. The rules vary by country, so contact the Social Security Administration if you plan to move internationally.