The 2025 Social Security wage base is $168,600

In 2025, you pay Social Security tax on earnings up to $168,600. Once your wages reach that amount in a calendar year, you stop paying the tax for the rest of that year. This limit, called the wage base, changes each year based on average wage growth in the economy.

The tax rate itself stays the same: 6.2 percent if you are an employee, or 12.4 percent if you are self-employed (you pay both the employer and employee portions). Your employer withholds the employee portion from your paycheck automatically.

The wage base increase from 2024 to 2025 was $3,600. This means higher earners will pay more into Social Security in 2025 than they did in 2024, because the threshold moved up.

Key Takeaways

  • The wage base limit for 2025 is $168,600, meaning you pay Social Security tax only on income up to that amount each year.
  • Once you earn $168,600 in a calendar year, your employer stops withholding Social Security tax from your paychecks for the remainder of that year.
  • The wage base increases most years to keep pace with wage growth; it was $160,200 in 2023 and $168,600 in 2025.
  • Self-employed workers must track their own earnings against the wage base and pay the full 12.4 percent tax on net self-employment income up to the limit.
  • Income above the wage base is not subject to Social Security tax, though it may be subject to Medicare tax, which has no earnings limit.

How the wage base affects your paycheck

If you earn $150,000 in 2025, you pay Social Security tax on all of it, because you have not reached the $168,600 limit. If you earn $180,000, you pay the tax only on the first $168,600 — the remaining $11,400 is not subject to Social Security tax.

For most workers, this means Social Security tax stops coming out of your paycheck sometime in the fall or winter, depending on your salary and pay schedule. Once you hit the wage base, you will notice your take-home pay increase because that tax is no longer being withheld.

If you work for multiple employers in the same year, each employer withholds Social Security tax independently up to the wage base. If your combined earnings exceed $168,600, you may end up overpaying. You can claim a refund of the excess when you file your tax return.

Why the wage base changes each year

The Social Security Administration adjusts the wage base annually to reflect changes in average wages across the country. The formula looks at the average wage index from two years prior and rounds to the nearest $300.

This adjustment is meant to keep Social Security funded as wages grow. Without it, a larger share of workers' earnings would fall outside the taxable range, and the program would collect less revenue relative to the size of the workforce.

The wage base has grown significantly over time. In 2000, it was $76,200. By 2020, it had reached $137,700. The steady increases reflect both inflation and real wage growth in the economy.

Self-employed workers and the wage base

If you are self-employed, you calculate your Social Security tax based on your net self-employment income — your business income minus business expenses. You pay tax on that net income up to the $168,600 wage base for 2025.

You owe the full 12.4 percent Social Security tax on net self-employment income up to the limit, plus 2.9 percent Medicare tax on all net self-employment income with no upper limit. You can deduct half of your self-employment tax when you file your income tax return.

Keep records of your quarterly earnings throughout 2025 so you know when you have reached the wage base. Once you do, you no longer owe Social Security tax on additional self-employment income that year, though you still owe Medicare tax.

Income above the wage base and Medicare tax

Earnings above $168,600 are not subject to Social Security tax, but they are subject to Medicare tax. The Medicare tax rate is 2.9 percent for employees and 5.8 percent for the self-employed (on net self-employment income).

Additionally, high earners pay an extra 0.9 percent Medicare tax on wages above certain thresholds: $200,000 for single filers, $250,000 for married couples filing jointly, and $125,000 for married couples filing separately. This extra tax has no wage base limit and applies to all income above the threshold.

This means that while your Social Security contribution stops at $168,600, your total payroll taxes continue on all earnings throughout the year.

What happens if you reach the wage base mid-year

If you reach $168,600 in earnings before the end of the year, your employer will stop withholding Social Security tax. Your paychecks will increase because that 6.2 percent is no longer being taken out.

This is automatic — you do not need to notify your employer or take any action. Your employer's payroll system tracks your year-to-date earnings and stops the withholding once the limit is reached.

If you change jobs during the year, each employer withholds independently. If your combined earnings from all jobs exceed $168,600, you will have overpaid Social Security tax. File your tax return to claim the refund; the IRS will process it as part of your return.

Frequently Asked Questions

What was the wage base in 2024?

The 2024 wage base was $168,600. The 2025 wage base is also $168,600 because the average wage index did not increase enough to trigger an adjustment. The wage base does not always increase every year.

Do I pay Social Security tax on bonuses and overtime?

Yes. Bonuses, overtime, and all other wages count toward the wage base limit. Once your total earnings for the year reach $168,600, no further Social Security tax is withheld on any additional income, regardless of the source.

If I work part-time and earn less than the wage base, do I still pay Social Security tax?

Yes. You pay Social Security tax on all earnings, no matter how small. The wage base is a ceiling, not a floor. Even if you earn $5,000 in a year, you pay the 6.2 percent Social Security tax on that amount.

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 who are covered by a different retirement system, and some religious groups that have filed for exemption.

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

Indirectly. Your Social Security benefit is based on your highest 35 years of earnings, up to the wage base for each year. Higher lifetime earnings generally mean a higher benefit, but only earnings up to each year's wage base count toward your record.