The 2025 Social Security wage base is $168,600

In 2025, you pay Social Security tax on earnings up to $168,600. That is the wage base — the maximum amount of your income subject to the 6.2% employee Social Security tax. If you earn more than $168,600, you do not pay Social Security tax on the amount above that threshold.

This wage base changes every year based on national wage trends. The Social Security Administration announces the new figure in October for the following year. The $168,600 figure for 2025 is higher than the 2024 wage base of $168,600 — the amount stays the same year to year only when average wages do not rise enough to trigger an increase.

The wage base affects both employees and self-employed people. If you are an employee, your employer withholds 6.2% of your wages up to the wage base. If you are self-employed, you pay both the employee and employer portions — 12.4% total — on your net self-employment income up to the wage base.

Key Takeaways

  • The 2025 wage base is $168,600, meaning you pay Social Security tax on earnings up to that amount and nothing on earnings above it.
  • Employees pay 6.2% and employers pay 6.2%; self-employed people pay 12.4% combined on net self-employment income up to the wage base.
  • The wage base increases most years when average national wages rise; it is announced each October for the following year.
  • High earners hit the wage base partway through the year and stop paying Social Security tax on additional income after that point.
  • Medicare tax (1.45%) has no wage base and applies to all earnings, plus an additional 0.9% tax on earnings over $200,000 for single filers.

How the wage base affects your paycheck

If you earn $168,600 or less in 2025, you pay Social Security tax on your entire income. Your employer withholds 6.2% from each paycheck, and your employer pays an equal 6.2% on your behalf. Together, that is 12.4% of your wages going into the Social Security system.

If you earn more than $168,600, you hit the wage base partway through the year and stop paying Social Security tax on additional income. For example, if you earn $200,000 in 2025, you pay Social Security tax only on the first $168,600. Once your year-to-date earnings reach $168,600, your employer stops withholding the 6.2% Social Security tax from your remaining paychecks. You still pay Medicare tax (1.45%) on all earnings, but not Social Security tax.

This matters most if you change jobs mid-year. If you worked at one employer and earned $100,000, then switched jobs and earned another $100,000 at a second employer, both employers would withhold Social Security tax on their full $100,000 — totaling $12,400 in Social Security tax. You would have overpaid because your total earnings ($200,000) exceeded the wage base. You can claim a refund of the overpayment when you file your tax return.

Self-employed contributions and the wage base

If you are self-employed, you pay both the employee and employer portions of Social Security tax — 12.4% total on your net self-employment income. The wage base still applies: you pay 12.4% on net self-employment income up to $168,600 in 2025.

Self-employment income is your net profit from your business after deducting business expenses. You calculate this on Schedule C (Form 1040) when you file your tax return. You then pay self-employment tax on Schedule SE, which applies the 12.4% Social Security rate and 2.9% Medicare rate to your net self-employment income (with a small adjustment for the employer-side deduction).

Unlike employees, self-employed people do not have an employer withholding the tax from paychecks. You may need to make estimated tax payments throughout the year to cover both income tax and self-employment tax. If you expect to owe $1,000 or more in taxes for the year, the IRS generally requires quarterly estimated payments.

Why the wage base increases and how to track it

The Social Security wage base is tied to the National Average Wage Index, which measures the average earnings of all workers in the United States. When this index rises, the wage base rises proportionally. The Social Security Administration calculates the new wage base each year and publishes it in October on its official website.

The wage base has increased most years since Social Security began in 1935, though the increase varies. Some years the increase is small (a few hundred dollars), and other years it is larger (several thousand dollars). The increase depends entirely on how much average wages grew that year — there is no fixed percentage or formula beyond the wage index itself.

You can find the current and historical wage bases on the Social Security Administration's website under "Contribution and Benefit Base." This page also lists the wage base for prior years, which is useful if you are reviewing old tax returns or calculating overpayments from previous years.

Medicare tax has no wage base limit

While Social Security tax stops at the wage base, Medicare tax does not. You pay 1.45% Medicare tax on all your wages, with no upper limit. Your employer pays an equal 1.45%, for a combined 1.45% employee and 1.45% employer contribution.

Additionally, if you earn more than $200,000 (single filers) or $250,000 (married filing jointly), you pay an extra 0.9% Medicare tax on earnings above those thresholds. This additional tax applies to both employees and self-employed people. Your employer withholds it from your paycheck if you are an employee; you pay it when you file your tax return if you are self-employed.

What happens if you overpay Social Security tax

Overpayment happens most often when you change jobs mid-year or work multiple jobs. If your total wages from all employers exceed the wage base, you will have paid Social Security tax on more than $168,600 in 2025.

When you file your Form 1040 tax return, you report all wages on line 1a. The IRS compares your total wages to the wage base and calculates whether you overpaid. If you did, the IRS refunds the overpayment as part of your tax return. You do not need to file a separate claim — the IRS handles it automatically when processing your return.

For example, if you earned $100,000 at Job A and $100,000 at Job B in 2025, you paid $12,400 in Social Security tax at each job ($24,800 total). The correct amount is $10,452.80 (6.2% of $168,600). The IRS will refund you $14,347.20 when it processes your return.

Frequently Asked Questions

Does the wage base explore to bonuses and overtime?

Yes. Bonuses, overtime, and any other compensation count as wages subject to the wage base. If you earn $150,000 in regular salary plus a $30,000 bonus, your total wages are $180,000. You pay Social Security tax on $168,600 of that and nothing on the remaining $11,400.

What if I work for multiple employers in 2025?

Each employer withholds Social Security tax independently based on what they pay you. If you earn $100,000 at each of two jobs, both will withhold Social Security tax on their full $100,000, even though your combined earnings exceed the wage base. You will overpay, but you can claim the refund on your tax return.

Does the wage base affect how much Social Security I receive when I retire?

Yes, indirectly. Social Security benefits are calculated based on your highest 35 years of earnings, but only earnings up to the wage base for each year count. Earnings above the wage base do not increase your benefit amount. This is why high earners do not receive proportionally higher benefits.

Do tips count toward the wage base?

Yes. Tips you report to your employer are treated as wages and subject to Social Security tax up to the wage base. If you work in food service, hospitality, or another tipped industry, make sure you report all tips to your employer so they can withhold the correct amount.

Is there a wage base for state Social Security taxes?

No. Only three states — Alaska, New Hampshire, and Tennessee — do not have state income tax. Other states that have state income tax do not use the federal Social Security wage base. State income tax applies to all wages with no upper limit, or to a different threshold set by that state. Check your state's tax authority website for state-specific rules.