What Social Security Employee Tax Is

Social Security employee tax is the money taken from your paycheck to fund the Social Security program. It appears on your pay stub as "Social Security tax" or "OASDI" (Old-Age, Survivors, and Disability Insurance). The amount is a fixed percentage of your gross wages, up to a yearly limit called the wage base.

Your employer also pays an equal amount on your behalf — this is the employer portion. Together, these two payments fund the Social Security trust fund, which pays retirement, disability, and survivor benefits to millions of Americans. You do not have a choice about whether to pay it; it is required by federal law for nearly all workers.

The tax rate and wage base change each year. The rate has been 6.2% on the employee side since 1990, but the wage base — the maximum earnings subject to the tax — increases annually based on national wage growth. In 2024, for example, the wage base was $168,600, meaning you paid Social Security tax only on earnings up to that amount.

Key Takeaways

  • Social Security employee tax is 6.2% of your wages, taken directly from your paycheck, with your employer paying an equal 6.2%.
  • You pay this tax only on earnings up to an annual limit (the wage base), which changes each year based on national wage increases.
  • The money you pay in is recorded under your Social Security number and counts toward your future Social Security benefits.
  • Self-employed workers pay both the employee and employer portions (15.4% total) but can deduct half of it on their tax return.
  • Most workers cannot opt out of Social Security tax, though certain government employees and religious groups have limited exemptions.

How the Tax Rate and Wage Base Work

The employee tax rate of 6.2% has remained the same since 1990, but the wage base — the threshold above which you stop paying — shifts every January. The Social Security Administration calculates the new wage base using the average wage index from two years prior. This means higher earners eventually stop paying Social Security tax partway through the year, while lower and middle-income workers pay on all their earnings.

For example, if the wage base is $168,600 and you earn $200,000 in a year, you pay 6.2% tax only on the first $168,600. Once you reach that limit, no more Social Security tax comes out of your remaining paychecks for that year. Your employer also stops paying the employer portion once you hit the wage base.

The wage base typically increases by a few thousand dollars each year, though the exact amount depends on how much average wages grew nationally. During years of low wage growth, the increase is smaller; during years of strong growth, it is larger. The Social Security Administration publishes the new wage base in October for the following year.

How Your Payments Build Your Social Security Record

Every dollar you pay in Social Security tax is recorded by the Social Security Administration under your Social Security number. The agency tracks your earnings year by year and uses this record to calculate your future benefits. To receive Social Security retirement benefits, you must have at least 40 credits of earnings, which typically means working and paying into the system for at least 10 years.

Your benefit amount is based on your highest 35 years of earnings. The more you earned during your working years, the higher your monthly benefit will be. If you worked fewer than 35 years, the Social Security Administration counts zero-earning years in the calculation, which lowers your average. This is why working longer and earning more can increase your eventual benefit.

You can view your earnings record and benefit estimate by creating an account on ssa.gov. The Social Security Administration sends a statement each year showing your recorded earnings and an estimate of what you might receive at different ages. If you spot an error in your earnings record, you can report it to the Social Security Administration, though you must do so within a specific timeframe.

Self-Employed Workers and Social Security Tax

If you are self-employed, you pay both the employee and employer portions of Social Security tax, for a total of 15.4%. This is called self-employment tax. You calculate it on your net business income (earnings minus business expenses) using Schedule SE when you file your federal income tax return.

The good news is that you can deduct half of your self-employment tax as a business expense on your tax return, which reduces your taxable income. You also pay self-employment tax only on net earnings up to the annual wage base, just as employees do. Many self-employed workers use a tax professional to calculate this correctly, since the rules are more complex than for regular employees.

Who Does Not Pay Social Security Employee Tax

Most workers in the United States pay Social Security tax, but some groups are exempt or have limited obligations. Federal employees hired before 1984 do not pay into Social Security; instead, they participate in the Civil Service Retirement System (CSRS). Federal employees hired in 1984 or later pay into both Social Security and the Federal Employees Retirement System (FERS).

Some state and local government employees do not pay Social Security tax if they are covered by their own pension system instead. Members of certain religious groups that object to receiving government benefits, such as the Amish and some Mennonite communities, can request exemption from both paying and receiving Social Security benefits. Nonresident aliens on certain visa types may also be exempt.

Students employed by the school or college where they are enrolled, and some family members working in a family business, may have limited or no Social Security tax obligations. If you think you might fall into one of these categories, contact the Social Security Administration or speak with a tax professional to understand your specific situation.

What Happens to the Money You Pay

The Social Security tax you pay does not go into a personal account with your name on it. Instead, it goes into the Social Security Trust Fund, which when ready pays benefits to current retirees, disabled workers, and survivors of deceased workers. This is called a "pay-as-you-go" system: current workers fund current beneficiaries.

When you retire and start receiving Social Security benefits, your benefits are paid from the taxes that current workers are paying. The trust fund also holds reserves to cover periods when benefit payments exceed incoming tax revenue. In recent years, the trust fund has been drawing down these reserves, which is why you may hear concerns about Social Security's long-term solvency.

The Social Security Administration publishes an annual report on the trust fund's status. You can read it on ssa.gov if you want to understand the program's financial picture in detail. The key point is that your tax payments are not saved for your retirement; they are spent when ready to pay today's beneficiaries.

How Social Security Tax Appears on Your Pay Stub

On your pay stub, Social Security tax usually appears as a line item labeled "Social Security" or "OASDI" (the official acronym). It shows the amount deducted from your gross pay. You will also see a matching employer contribution listed, though that does not come out of your paycheck — it is paid by your employer separately.

Your year-to-date Social Security tax is also shown, so you can track how much you have paid so far in the calendar year. Once you reach the wage base limit, the Social Security tax line will show zero for the remaining paychecks of that year. If you work for multiple employers in the same year, each one withholds Social Security tax independently, which can result in overpayment. You can recover the overage when you file your federal income tax return.

Frequently Asked Questions

Can I get a refund of Social Security tax I have already paid?

No, you cannot get a refund of Social Security tax once it has been withheld. However, if you worked for multiple employers in the same year and paid Social Security tax on earnings above the wage base, you can claim a credit on your federal income tax return. The Social Security Administration does not refund the overpayment; instead, you claim it when filing taxes.

What is the difference between Social Security tax and Medicare tax?

Social Security tax is 6.2% and funds retirement, disability, and survivor benefits. Medicare tax is 1.45% and funds hospital insurance for people 65 and older. Both are withheld from your paycheck. Medicare tax has no wage base limit, so you pay it on all earnings, while Social Security tax stops once you reach the annual wage base.

Does Social Security tax go up every year?

The tax rate (6.2%) has not changed since 1990. However, the wage base — the maximum earnings subject to the tax — increases most years based on national wage growth. This means higher earners pay more total tax each year, but the percentage rate stays the same for everyone.

What if my employer did not withhold Social Security tax from my paycheck?

Contact your employer when ready and ask them to correct the error. Employers are required by law to withhold and pay Social Security tax. If your employer refuses or continues to fail to withhold, you can report them to the Internal Revenue Service (IRS) or contact the Social Security Administration. You remain responsible for paying your share, so do not ignore the problem.

Do I need to do anything special to receive Social Security benefits later?

No special action is needed while you are working. The Social Security Administration automatically tracks your earnings and credits. When you are ready to receive benefits, you will need to contact the Social Security Administration to file a claim. You can do this online at ssa.gov, by phone, or in person at a local Social Security office.