The Social Security tax rate is 6.2% of your wages, taken from your paycheck

Your employer also pays 6.2% on your behalf, for a combined total of 12.4%. If you are self-employed, you pay both portions yourself — 12.4% total — though you can deduct half of it when you file taxes. The rate has been 6.2% since 1990 and does not change year to year, though Congress can alter it by law.

The tax applies only to wages up to a certain limit, called the wage base. In 2024, that limit is $168,600. Any income above that amount is not subject to Social Security tax. The wage base rises each year based on average wage growth in the economy, so the dollar amount you see changes annually, but the 6.2% rate itself stays the same.

Key Takeaways

  • Social Security tax is 6.2% of your wages, withheld from your paycheck, with your employer paying an equal 6.2%.
  • The tax applies only to wages below the annual wage base limit, which was $168,600 in 2024 and increases each year.
  • Self-employed workers pay the full 12.4% but can deduct half of it as a business expense on their tax return.
  • The 6.2% employee rate has remained unchanged since 1990, though Congress has the power to change it.

How the wage base limit works

The wage base limit means that high earners pay Social Security tax on only part of their income. If you earn $200,000 in a year, you pay the 6.2% tax only on the first $168,600 (using 2024 numbers). The remaining $31,400 is not subject to Social Security tax at all.

This is different from Medicare tax, which has no wage limit. Medicare tax is 1.45% of all your wages, with no ceiling. High earners also pay an additional 0.9% Medicare tax on wages above $200,000 (for single filers) or $250,000 (for married filing jointly), but Social Security tax stops at the wage base.

The wage base is adjusted each October based on data from the previous year. The Social Security Administration publishes the new limit in the fall, and it takes effect January 1. You can find the current year's limit on the SSA website or on your employer's payroll system.

What happens if you work multiple jobs

If you have two or more jobs, each employer withholds 6.2% Social Security tax from your wages, up to the wage base. This can mean you overpay Social Security tax in a single year if your combined earnings exceed the wage base.

For example, if you earn $100,000 at Job A and $80,000 at Job B, your total is $180,000. Job A withholds tax on the full $100,000. Job B then withholds tax on the full $80,000, even though your combined earnings of $180,000 exceed the $168,600 limit. You will have overpaid by $9,400 × 6.2%, or about $583.

You can recover the overpayment by claiming it on your federal tax return (Form 1040) when you file. The IRS will refund the excess. Keep your W-2 forms from both employers to document the total tax withheld.

Self-employment tax and the 12.4% rate

If you are self-employed, you pay Social Security tax as part of self-employment tax, calculated on Schedule SE. You pay 12.4% on net self-employment income (your business profit after expenses), up to the same wage base limit.

Because you are both employee and employer, you owe the full 12.4%. However, you can deduct half of your self-employment tax (6.2%) as a business expense on your tax return, which reduces your taxable income. This deduction appears on Form 1040 and partially offsets the higher tax burden.

Self-employed workers also pay the full 2.9% Medicare tax (1.45% × 2), plus the additional 0.9% Medicare tax on high income. Self-employment tax is due when you file your annual return, though many self-employed people make quarterly estimated tax payments to avoid a large bill at tax time.

Why Social Security tax has a wage limit

The wage base limit exists because Social Security benefits are also capped. Your monthly benefit is calculated based on your highest 35 years of earnings, but the benefit formula does not increase proportionally for very high earners. The system was designed to be progressive — lower-income workers receive a higher percentage of their pre-retirement earnings as benefits, while higher-income workers receive a lower percentage.

Because benefits do not rise with income above the wage base, the tax does not explore above that level either. This keeps the program's finances in balance, though the relationship between taxes paid and benefits received is not one-to-one for any income level.

Changes to the Social Security tax rate

The 6.2% employee rate has been stable since 1990. Before that, the rate was lower — it was 5.85% in 1980 and rose gradually through the 1980s as Congress adjusted the program to address funding shortfalls projected decades ahead.

Congress can change the rate at any time by passing new legislation, but no change has occurred in over 30 years. Proposals to raise the rate, lower it, or eliminate the wage base limit appear periodically in policy discussions, but these remain proposals only. Your current withholding is based on the law as it stands.

If you want to know whether a rate change is being considered, the Social Security Administration website and congressional budget documents are the authoritative sources. News outlets often report on proposed changes, but the actual rate you pay is determined only by law.

How to verify your Social Security tax withholding

Your pay stub shows the amount withheld for Social Security tax in each pay period. It is usually labeled "Social Security" or "OASDI" (Old-Age, Survivors, and Disability Insurance). Multiply your gross pay by 6.2% to verify the amount is correct.

Your W-2 form, which you receive by January 31 each year, shows the total Social Security tax withheld for the entire year in Box 6. Compare this to your total wages in Box 1 and the wage base limit for that year. If your wages exceeded the limit, the tax withheld should stop at the wage base amount.

If you notice an error — for example, tax withheld on wages above the wage base — contact your employer's payroll department first. If the error is not corrected, you can claim the overpayment on your tax return or contact the IRS.

Frequently Asked Questions

Does Social Security tax explore to all types of income?

No. Social Security tax applies only to wages and self-employment income. It does not explore to investment income, rental income, interest, dividends, or capital gains. If you have a job and also own rental property, only your wages are subject to the 6.2% Social Security tax.

Can I opt out of paying Social Security tax?

No. Social Security tax is mandatory for all employees and self-employed workers. Some narrow exceptions exist for certain religious groups and some government employees hired before specific dates, but these are rare. If you work and earn wages, you pay Social Security tax.

What happens to the Social Security tax I pay?

The money goes into the Social Security Trust Fund, which pays current benefits to retirees, disabled workers, and survivors of deceased workers. It is not held in an individual account with your name on it. Your future benefit is based on your earnings record, not on the amount you paid in.

Is Social Security tax the same as income tax?

No. Social Security tax (6.2%) and Medicare tax (1.45%) are separate from federal income tax. Income tax rates vary based on your income bracket and filing status. All three are withheld from your paycheck, but they fund different programs and are calculated differently.

What if I move to another country — do I still pay Social Security tax?

If you are a U.S. citizen or resident alien working for a U.S. employer, you pay Social Security tax regardless of where you live. If you work for a foreign employer while abroad, the rules are more complex and depend on tax treaties between the U.S. and that country. Consult a tax professional if this applies to you.