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

Social Security tax comes out of your gross pay before most other deductions. Your employer withholds 6.2% of your earnings and sends it to the Social Security Administration. If you are self-employed, you pay both the employee and employer portions — 12.4% total — though you can deduct half of it on your tax return.

The 6.2% rate has been the same since 1990. It applies only to wages up to a certain cap, which changes each year. For 2024, that cap is $168,600 — meaning once you earn that much in a year, no more Social Security tax is withheld from your remaining paychecks.

Key Takeaways

  • Employees pay 6.2% of wages in Social Security tax; employers pay an equal 6.2%, for a combined 12.4%.
  • The tax applies only to wages below an annual cap, which was $168,600 in 2024 and increases most years.
  • Self-employed workers pay the full 12.4% but can deduct half of it as a business expense on their tax return.
  • The money withheld funds current Social Security benefits for retirees, disabled workers, and survivors — not a personal account in your name.

Why there is a wage cap

The wage cap exists because Social Security benefits are capped too. Higher earners receive larger benefits, but not proportionally larger — the formula replaces a smaller percentage of their income. Because of this structure, Congress set a maximum wage subject to the tax.

The cap rises most years based on average wage growth in the economy. In 2023 it was $160,200; in 2024 it became $168,600. The Social Security Administration announces the new cap each October for the following year. High earners pay the same total Social Security tax as someone who hits the cap partway through the year, even if they earn significantly more.

How self-employment tax works

If you are self-employed, you pay Social Security tax on your net business income (after deducting business expenses). You owe 12.4% for Social Security plus 2.9% for Medicare, totaling 15.3% in self-employment tax. This is higher than an employee's 6.2% because you cover both the employee and employer share.

The self-employment tax cap matches the wage cap for employees. In 2024, you pay self-employment tax only on net income up to $168,600. You report this on Schedule SE when you file your tax return. The IRS allows you to deduct half of your self-employment tax as an adjustment to income, which lowers your taxable income.

What happens to the money you pay

Social Security tax does not go into an account with your name on it. The money collected from current workers funds benefits paid to current retirees, disabled workers, and survivors of deceased workers. This is called a pay-as-you-go system. Your future benefits will be funded by workers paying into the system after you retire.

The Social Security Trust Fund holds reserves to cover the difference between incoming tax revenue and outgoing benefits. The trustees project that at current rates, the trust fund will be depleted around 2034, after which incoming tax revenue alone would cover roughly 80% of scheduled benefits unless Congress changes the law.

How Social Security tax appears on your pay stub

Your pay stub shows Social Security tax as a line item, often labeled "FICA-SS" or "Social Security." FICA stands for Federal Insurance Contributions Act. The amount withheld is 6.2% of your gross wages for that pay period, up to the annual cap. Once you reach the wage cap for the year, this line will show zero for the rest of the year.

Your employer also pays 6.2% on your behalf, but this does not appear on your pay stub — it is a separate employer expense. Both amounts are reported to the Social Security Administration, and both count toward your earnings record and future benefit calculation.

Medicare tax is separate from Social Security tax

Medicare tax is 1.45% of your wages and is withheld separately from Social Security tax. Employees pay 1.45%; employers pay 1.45%. Unlike Social Security tax, there is no wage cap on Medicare tax — it applies to all your earnings.

High earners pay an additional 0.9% Medicare tax on wages above $200,000 (single filers) or $250,000 (married filing jointly). This extra tax was added in 2013 and funds the Medicare program. Together, Social Security and Medicare taxes make up most of the FICA withholding you see on your pay stub.

Frequently Asked Questions

Do I pay Social Security tax on all my income?

No. Social Security tax applies only to wages and self-employment income below the annual cap. In 2024, the cap is $168,600. Income from investments, rental property, or other sources does not trigger Social Security tax. Once you earn the capped amount in wages during a year, no more Social Security tax is withheld from your paychecks.

Can I opt out of paying Social Security tax?

No. Social Security tax is mandatory for all employees and self-employed workers. The only exception is certain government employees hired before 1984 who are covered by their own pension system instead. If you work for a private employer or are self-employed, you must pay.

Does my employer's 6.2% contribution count toward my benefits?

Yes. Both the employee and employer portions of Social Security tax are credited to your earnings record. The Social Security Administration counts the full 12.4% when calculating your future benefit amount. You do not see the employer portion on your pay stub, but it counts toward your benefit.

What if I work for multiple employers in one year?

Each employer withholds 6.2% up to the wage cap independently. If you earn $100,000 at one job and $100,000 at another, you may overpay Social Security tax because each employer withholds based on what they pay you, not your total income. You can claim the overpayment as a credit on your tax return when you file.

Does Social Security tax change based on my age or income level?

No. The 6.2% rate is the same for all employees regardless of age or income. The only difference is the wage cap — once you earn above it, the rate stops applying. Older workers and younger workers pay the same percentage on the same wages.