What you pay into Social Security in 2025

In 2025, you pay Social Security tax on your wages at a rate of 6.2 percent, and your employer pays another 6.2 percent on your behalf — totaling 12.4 percent of your earnings. If you are self-employed, you pay both portions yourself, which comes to 12.4 percent of your net self-employment income. These taxes fund the Social Security trust fund that pays retirement, disability, and survivor benefits.

The tax applies only to earnings up to a certain cap, called the wage base. In 2025, that cap is $168,600. This means if you earn $200,000 in a year, you pay Social Security tax only on the first $168,600 of that income. Earnings above the cap are not subject to Social Security tax. The wage base changes each year based on average wage growth in the economy.

Medicare tax is separate from Social Security tax. You also pay 1.45 percent Medicare tax on all your wages with no cap, and your employer pays another 1.45 percent. If you earn over $200,000 as a single filer (or $250,000 if married filing jointly), you pay an additional 0.9 percent Medicare tax on the excess.

Key Takeaways

  • The Social Security tax rate in 2025 is 6.2 percent for employees and 6.2 percent for employers, applied to wages up to $168,600.
  • Self-employed workers pay the full 12.4 percent Social Security tax on net self-employment income, though they can deduct half of it on their tax return.
  • The wage base cap of $168,600 means high earners pay Social Security tax only on a portion of their income.
  • Social Security tax is withheld automatically from your paycheck if you are an employee; self-employed workers pay it quarterly through estimated tax payments.

How Social Security tax is withheld from your paycheck

If you are an employee, your employer withholds Social Security tax directly from your paycheck. You will see it listed on your pay stub as "FICA" (Federal Insurance Contributions Act) or "Social Security." The amount withheld is 6.2 percent of your gross wages, up to the annual wage base. Your employer also withholds Medicare tax at 1.45 percent on all wages.

Your employer sends both the amount withheld from your pay and their matching contribution to the Internal Revenue Service (IRS) on your behalf. You do not have to do anything — the withholding happens automatically. At the end of the year, your employer reports your total wages and taxes paid on your W-2 form, which you use when filing your income tax return.

If you work for multiple employers in the same year, each one withholds Social Security tax independently. This can result in overpayment if your combined wages exceed the wage base. For example, if you earn $100,000 from one job and $80,000 from another, you will pay Social Security tax on the full $180,000 even though the wage base is $168,600. You can claim a credit for the overpayment when you file your tax return.

Self-employment taxes and what you owe

If you are self-employed, you pay Social Security and Medicare taxes through self-employment tax rather than through payroll withholding. Self-employment tax covers both the employee and employer portions, totaling 15.3 percent (12.4 percent for Social Security and 2.9 percent for Medicare). You calculate it on your net self-employment income — your business income minus business expenses.

Self-employed workers pay self-employment tax quarterly through estimated tax payments, or they can pay it all at once when they file their annual tax return. The IRS provides Form 1040-ES to help you calculate quarterly payments. You must file Schedule SE (Self-Employment Tax) with your tax return to report the amount owed.

The Social Security wage base limit of $168,600 also applies to self-employment income. Once your net self-employment income reaches $168,600, you stop paying the 12.4 percent Social Security portion but continue paying the 2.9 percent Medicare tax on all remaining income. However, you can deduct half of your self-employment tax on your income tax return, which reduces your taxable income.

Wage base changes and how they affect you

The Social Security wage base is not fixed — it increases each year based on changes in average wages across the economy. The Social Security Administration (SSA) announces the new wage base in October for the following year. In 2024, the wage base was $168,600, the same as 2025. In previous years it has been lower: $160,200 in 2023, $147,000 in 2022, and $142,800 in 2021.

When the wage base increases, higher-earning workers pay Social Security tax on a larger portion of their income. For example, if the wage base rises to $175,000 next year, someone earning $200,000 would pay Social Security tax on $175,000 instead of $168,600. This means a slightly higher total tax bill for high earners, though the rate itself (6.2 percent) does not change.

The wage base affects how much you contribute to Social Security over your working life, which in turn affects the benefit amount you receive at retirement. The SSA uses your highest 35 years of earnings to calculate your benefit, so higher contributions during high-earning years can increase your eventual benefit.

Tax credits and deductions related to Social Security taxes

If you are an employee, you cannot deduct Social Security tax from your taxable income — it is withheld before you receive your paycheck. However, if you overpaid Social Security tax because you worked for multiple employers, you can claim a credit on your tax return. You report this on Form 1040 when you file.

Self-employed workers have more options. You can deduct half of your self-employment tax as an adjustment to income on your tax return. This reduces your taxable income and lowers your overall tax bill. For example, if you owe $3,000 in self-employment tax, you can deduct $1,500, which reduces your income tax.

Some workers may be covered by a pension from a job where they did not pay Social Security tax. If this applies to you, the Government Pension Offset and Windfall Elimination Provision may reduce your Social Security benefits or spousal benefits. These rules are complex and depend on your specific situation, so contact the Social Security Administration directly if you have a government pension.

How Social Security taxes fund benefits

The Social Security taxes you pay go into the Social Security Trust Fund, which pays benefits to current retirees, disabled workers, and survivors of deceased workers. It is not a personal savings account — it is a pay-as-you-go system where current workers' taxes fund current beneficiaries' payments. The amount you receive in benefits is based on your earnings record and age when you claim, not on how much tax you paid.

The Social Security Administration maintains a record of your earnings and the taxes you paid each year. You can view your earnings record and benefit estimate by creating an account on ssa.gov. This record determines your benefit amount when you reach retirement age or if you become disabled.

The trust fund faces long-term challenges because the population is aging and fewer workers are paying taxes relative to the number of beneficiaries. The SSA projects that by 2034, the trust fund reserves will be depleted if no changes are made to tax rates or benefit levels. However, even if reserves are depleted, incoming tax revenue would still cover about 80 percent of scheduled benefits.

Frequently Asked Questions

What happens if I work part-time or have irregular income?

Social Security tax is calculated on whatever you earn, whether full-time or part-time. If you earn less than the wage base, you pay 6.2 percent on all your earnings. If you have irregular income, your employer still withholds the correct amount each pay period. Self-employed workers with irregular income should use Form 1040-ES to estimate their annual tax and adjust quarterly payments as needed.

Do I pay Social Security tax on bonuses and overtime?

Yes. Bonuses, overtime pay, and other forms of compensation are subject to Social Security tax at the same 6.2 percent rate, up to the annual wage base. Your employer withholds Social Security tax on these payments just as they do on regular wages.

Can I opt out of paying Social Security tax?

No. Social Security tax is mandatory for all employees and self-employed workers with net earnings of $400 or more. The only exceptions are certain religious groups that have received an exemption from the IRS, and some government employees hired before specific dates who are covered by alternative pension systems.

What if I did not pay Social Security tax for some years?

The Social Security Administration uses your highest 35 years of earnings to calculate your 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 (roughly 10 years of work) to be covered for retirement benefits. Contact the SSA if you believe your earnings record is incomplete or incorrect.

How do I know if my employer is paying their share of Social Security tax?

Your W-2 form shows the Social Security tax withheld from your pay, but it does not show your employer's matching contribution. You can verify your earnings record by checking your Social Security statement on ssa.gov. If you suspect your employer is not paying their share, you can report it to the IRS at irs.gov or call 1-800-829-1040.