The 2025 Social Security tax rate is 12.4 percent of your wages, split between you and your employer

If you work as an employee, you pay 6.2 percent of your gross wages into Social Security, and your employer pays the other 6.2 percent. If you are self-employed, you pay the full 12.4 percent yourself, though you can deduct half of it as a business expense on your tax return. The rate has stayed at 12.4 percent since 1990 and does not change year to year.

The tax applies only to wages up to a certain limit, called the wage base. For 2025, that limit is $168,600. If you earn more than that, you stop paying Social Security tax once you hit the cap — Medicare tax continues on all wages above it. If you work for multiple employers in the same year, each one withholds based on their own payroll, so you could temporarily pay on more than the cap across all jobs combined. You can claim a credit for the overpayment when you file your tax return.

Key Takeaways

  • Employees pay 6.2 percent of wages up to $168,600 in 2025, and employers pay another 6.2 percent.
  • Self-employed workers pay the full 12.4 percent but can deduct half of it on their tax return.
  • The wage base of $168,600 is the maximum amount of earnings subject to Social Security tax each year.
  • If you work multiple jobs, you may pay Social Security tax on more than the annual cap and can reclaim the overpayment at tax time.

How the wage base is set each year

The Social Security Administration adjusts the wage base annually based on changes in average wages across the country. The 2025 wage base of $168,600 is higher than 2024's $168,600 — the amount rises when national average wages rise. The SSA announces the new wage base in October of the prior year, so employers and payroll systems have time to update their withholding.

This adjustment means that as wages grow in the economy, more of your income becomes subject to Social Security tax. Someone earning $170,000 in 2025 pays tax on $168,600 of it; if the wage base rises to $175,000 in 2026, that same person would pay tax on more of their income.

What happens when you work multiple jobs

Each employer withholds Social Security tax based only on what you earn from them, without knowing about your other jobs. If you earn $100,000 at one job and $80,000 at another, both employers will withhold the full 6.2 percent, even though your combined earnings of $180,000 exceed the $168,600 wage base.

When you file your federal tax return, you report all wages and Social Security tax paid across all jobs. If your total withholding exceeds what you owe based on the $168,600 cap, the IRS refunds the overpayment. You do not need to do anything special to claim it — the IRS calculates it automatically when processing your return.

Self-employment tax and Social Security

If you are self-employed, you pay Social Security tax through self-employment tax, calculated on Schedule SE of your tax return. You pay 12.4 percent on net self-employment income up to $168,600 for 2025. Because you are both employee and employer, you pay the full rate, but you can deduct half of your self-employment tax as an adjustment to income, which lowers your taxable income.

Self-employment income is your net profit from your business — revenue minus business expenses. If you have a loss, you do not owe self-employment tax on it. The calculation happens at tax time, not through payroll withholding, so you may need to make quarterly estimated tax payments to avoid penalties.

How Social Security tax connects to your future benefits

The amount you pay into Social Security does not directly determine the amount you receive later. Instead, your benefit is based on your 35 highest-earning years of work. The Social Security Administration tracks your earnings record and uses a formula that replaces a percentage of your pre-retirement income, with higher earners receiving a smaller percentage replacement than lower earners.

You must have earned at least 40 credits — roughly 10 years of work at current wage levels — to be may have access to to retirement benefits. Credits are earned based on annual earnings, not on how much tax you paid. Working longer and earning more can increase your benefit amount, but only if those years replace lower-earning years in your top 35.

Tax treatment of Social Security wages

Social Security tax is withheld from your paycheck before federal income tax is calculated, so it reduces your take-home pay when ready. Unlike income tax withholding, Social Security tax is not refundable — you cannot get it back except in the case of overpayment due to multiple jobs or self-employment income adjustments.

Your employer's share of Social Security tax is a business expense and does not appear on your paycheck, but it is part of your total compensation cost. Self-employed workers pay both shares but receive a tax deduction for half, which partially offsets the burden.

Frequently Asked Questions

Does the Social Security tax rate ever change?

The 12.4 percent rate has been the same since 1990 and is set by law. Congress would have to pass new legislation to change it. The wage base changes every year based on average wage growth, but the percentage rate itself does not.

What if I earn more than the wage base in 2025?

You pay Social Security tax only on the first $168,600 of your earnings. Income above that is not subject to Social Security tax, though it is still subject to Medicare tax at 2.9 percent (or 3.8 percent if you are a high earner). This is why high earners pay a smaller percentage of their total income into Social Security.

Can I opt out of paying Social Security tax?

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

If I pay more than the cap across multiple jobs, how do I get the overpayment back?

You do not need to do anything. When you file your federal tax return and report all wages and all Social Security tax paid, the IRS automatically calculates any overpayment and refunds it to you or applies it to other taxes owed.

Does my employer's share of Social Security tax count toward my benefits?

No. Only your own earnings count toward your Social Security record. Your employer's contribution goes into the Social Security trust fund but does not increase your individual benefit calculation. Your benefit is based on your own reported wages.