What you pay into Social Security and how much comes out of your paycheck

In 2025, you pay 6.2% of your wages into Social Security, and your employer pays another 6.2% on your behalf — that is 12.4% total. If you are self-employed, you pay both portions yourself, which comes to 15.3% (the extra 0.9% covers Medicare). These percentages do not change year to year, but the amount of your wages subject to the tax does.

The wage base limit for 2025 is $168,600. That means you only pay Social Security tax on earnings up to that amount. If you earn $200,000 in 2025, you pay the tax on $168,600 and nothing on the remaining $31,400. This limit rises most years based on average wage growth in the country — it was $160,200 in 2024, so it went up $8,400 for 2025.

Your employer withholds your 6.2% automatically from each paycheck. If you work for multiple employers in the same year, each one withholds 6.2% separately, which can mean you overpay if your combined earnings exceed the wage base. You can claim the overpayment back when you file your tax return.

Key Takeaways

  • The Social Security tax rate is 6.2% of your wages in 2025, with your employer paying an equal 6.2%.
  • You only pay the tax on earnings up to $168,600 in 2025; earnings above that amount are not taxed for Social Security.
  • The wage base limit increases most years based on national wage growth, so the threshold changes annually.
  • If you work for multiple employers and your total earnings exceed the wage base, you may overpay and can reclaim the difference on your tax return.
  • Self-employed workers pay both the employee and employer portions, totaling 15.3% when combined with Medicare tax.

Who pays Social Security tax and who does not

Most workers in the United States pay Social Security tax. If you are employed and receive a W-2 at the end of the year, you are paying it. The tax applies to wages, salaries, bonuses, and tips — essentially any compensation your employer reports to the IRS.

Some groups do not pay Social Security tax. Federal government employees hired before 1984 are typically exempt and instead pay into a different retirement system. Some state and local government workers also have their own pension systems and do not contribute to Social Security. Railroad workers pay into the Railroad Retirement Board instead. Certain religious groups that have filed for exemption may not pay the tax, though this is rare.

If you are not sure whether your job is covered, check your pay stub. If you see a line for "Social Security tax" or "OASDI" (Old-Age, Survivors, and Disability Insurance), you are paying in. If that line is blank or zero, you are not.

How the wage base limit affects what you owe

The wage base limit exists because Social Security benefits are capped — you cannot receive more than a certain amount per month no matter how much you earned. In 2025, the maximum monthly benefit is around $3,822 for someone who waits until age 70 to claim. Because benefits max out, the program only taxes income up to a certain level.

Here is how it works in practice: if you earn $168,600 in 2025, you pay 6.2% on all of it. If you earn $200,000, you pay 6.2% on $168,600 only — that is $10,453.20. The remaining $31,400 is not subject to Social Security tax (though it is subject to Medicare tax, which has no wage limit). If you earn $150,000, you pay 6.2% on the full $150,000 because you have not hit the limit.

The wage base limit rose from $160,200 in 2024 to $168,600 in 2025. The Social Security Administration announces the new limit each October based on the average wage index from the prior year. If wages in the country grow faster, the limit rises more; if wage growth is slower, it rises less.

What happens if you work multiple jobs

When you work for more than one employer in the same year, each employer withholds 6.2% Social Security tax from your paycheck independently. They do not know about your other jobs unless you tell them. This can lead to overpayment.

Example: You work two part-time jobs and earn $100,000 at Job A and $80,000 at Job B, for a total of $180,000. Job A withholds 6.2% on $100,000 ($6,200). Job B withholds 6.2% on $80,000 ($4,960). Your total withholding is $11,160. But because the wage base limit is $168,600, you should only pay 6.2% on $168,600, which is $10,453.20. You overpaid by $706.80.

You recover the overpayment when you file your federal income tax return. The IRS compares your total Social Security tax withheld to what you actually owed based on your total earnings and the wage base limit. If you overpaid, you get the difference back as part of your refund or as a credit against taxes owed. You do not need to do anything special — the IRS calculates it automatically when you file.

Self-employed workers and Social Security tax

If you are self-employed, you pay both the employee and employer portions of Social Security tax. That is 12.4% total, plus 2.9% for Medicare, for a combined self-employment tax of 15.3%. You pay this when you file your annual tax return, usually by making quarterly estimated tax payments throughout the year.

The calculation starts with your net self-employment income — your business income minus business expenses. You then apply the 15.3% rate, but you get a deduction for half of your self-employment tax, which lowers your taxable income. The wage base limit of $168,600 still applies, so you only pay the 12.4% Social Security portion on net earnings up to that amount.

Self-employed workers report this on Schedule SE (Self-Employment Tax) when they file their tax return. If you are unsure how to calculate it, a tax preparer or accountant can walk you through the numbers. The IRS also provides worksheets and instructions on Form 1040.

How your Social Security tax connects to future benefits

The money you pay in Social Security tax does not sit in an account with your name on it. Instead, it funds current benefits for retirees, disabled workers, and survivors. Your future benefit amount is based on your earnings record — the Social Security Administration tracks your wages each year and uses your highest 35 years of earnings to calculate what you will receive.

The more you earn and pay in, the higher your future benefit will be, up to the maximum. In 2025, the average monthly benefit for a retired worker is around $1,907, but this varies widely based on your earnings history and the age at which you claim. If you claim at 62, your benefit is smaller; if you wait until 70, it is larger.

You can view your earnings record and estimated benefit amount by creating an account at ssa.gov. The Social Security Administration sends out statements showing your projected benefits at different claiming ages. This helps you understand how your current earnings are building toward your future benefit.

Changes to Social Security tax and the trust fund

The Social Security tax rate of 6.2% has been the same since 1990. The wage base limit changes annually, but the percentage itself does not. However, the program faces a long-term funding challenge: the Social Security Trust Fund is projected to be depleted around 2033 if no changes are made. After that date, incoming tax revenue would only cover about 80% of scheduled benefits.

Congress would need to act to address this — either by raising the tax rate, raising or eliminating the wage base limit, reducing benefits, raising the full retirement age, or some combination of these. As of early 2025, no changes have been enacted. Any changes would likely affect future workers more than current retirees, but the details depend on what Congress decides.

For now, the tax rate and wage base limit remain as described above. If you want to stay informed about potential changes, the Social Security Administration publishes updates on its website, and news outlets typically cover any legislative proposals.

Frequently Asked Questions

Can I opt out of paying Social Security tax?

No, Social Security tax is mandatory for covered workers. The only exceptions are certain federal employees hired before 1984, some state and local government workers with their own pension systems, and members of specific religious groups who have filed for exemption with the IRS. Most workers cannot opt out.

What if I did not work the full year in 2025?

You only pay Social Security tax on the wages you actually earned. If you worked six months and earned $80,000, you pay 6.2% on $80,000. There is no minimum earnings requirement to be covered by Social Security, and even one quarter of work can count toward your benefit record.

Do I pay Social Security tax on unemployment benefits or disability payments?

No. Unemployment benefits and Social Security Disability Insurance (SSDI) payments are not subject to Social Security tax. However, some unemployment benefits may be subject to federal income tax depending on your total income. Wages you earn while receiving unemployment are subject to Social Security tax.

Why is my Social Security tax different from my coworker's if we earn the same amount?

The most common reason is that your coworker may have other jobs, may be self-employed, or may have reached the wage base limit earlier in the year. If you both work only at your current job and earn the same amount, your Social Security tax withholding should be the same. Check your pay stubs to compare the actual amounts withheld.

If I move to another country, do I still pay Social Security tax?

If you are a U.S. citizen or resident alien working for a U.S. employer, you generally still pay Social Security tax even if you live abroad. If you are a nonresident alien, the rules are more complex and depend on your visa status and the country where you work. Consult a tax professional or the IRS if you are working internationally.