What Social Security payroll tax is and who pays it

Social Security payroll tax is a percentage of your wages that you and your employer both contribute to fund Social Security benefits. The tax is taken directly from your paycheck before you receive it. As of 2024, you pay 6.2% of your wages, and your employer pays another 6.2% — a combined total of 12.4%. If you are self-employed, you pay both portions yourself, which comes to 12.4% of your net earnings.

The tax applies only to wages up to a certain limit, called the wage base. This limit changes each year. In 2024, the wage base is $168,600, meaning you pay Social Security tax on the first $168,600 you earn in a year, but not on any income above that amount. Your employer also stops withholding once you reach this cap.

The money you pay goes into a trust fund that pays current Social Security benefits to retirees, disabled workers, and survivors of deceased workers. Your tax contributions are recorded under your Social Security number and count toward your future benefit amount.

Key Takeaways

  • You pay 6.2% of your wages in Social Security tax, and your employer pays another 6.2%, for a total of 12.4% of your earnings.
  • Self-employed workers pay the full 12.4% themselves, though they can deduct half of it on their tax return.
  • The tax only applies to earnings up to the annual wage base, which was $168,600 in 2024 and increases most years.
  • Your payroll tax contributions are tracked by Social Security and directly affect how much you will receive in retirement or disability benefits.
  • You can see how much you have paid in Social Security tax on your annual Social Security statement or online account.

How much you pay each year

The amount you pay depends on your gross wages and the annual wage base. If you earn $50,000 per year, you pay $3,100 in Social Security tax (6.2% of $50,000). If you earn $200,000 per year, you pay $10,453.20 (6.2% of $168,600, the 2024 wage base) — not 6.2% of the full $200,000, because the tax stops at the wage base.

Your employer withholds this amount from each paycheck automatically. You do not have to do anything to pay it — it comes out before you see your take-home pay. On your pay stub, you will see a line labeled "Social Security" or "OASDI" (Old-Age, Survivors, and Disability Insurance) showing the amount withheld.

If you work for multiple employers in the same year, each one withholds Social Security tax up to the wage base. If your combined earnings exceed the wage base, you may have overpaid. You can claim a refund of the excess when you file your federal income tax return.

Self-employed workers and Social Security tax

If you are self-employed, you pay both the employee and employer portions of Social Security tax, totaling 12.4% of your net self-employment income. You pay this as part of your self-employment tax when you file your annual tax return, usually using Schedule SE (Form 1040).

The IRS allows you to deduct half of your self-employment tax as a business expense on your tax return, which reduces your taxable income. This deduction roughly offsets the employer portion you are paying. You still owe the full 12.4%, but the deduction lowers your overall tax burden.

The wage base limit applies to self-employed income the same way it applies to wages. In 2024, you pay self-employment tax on the first $168,600 of net self-employment income, but not on earnings above that amount.

How your contributions affect your future benefits

Social Security tracks your payroll tax contributions throughout your working life. The amount you paid in, combined with how long you worked, determines how much you receive in retirement benefits. Generally, the more you paid in and the longer you worked, the higher your monthly benefit will be.

Social Security requires you to have worked and paid into the system for a minimum period to receive benefits. For retirement benefits, you typically need 40 credits, which is roughly 10 years of work. Each year you earn above a certain threshold (which changes annually), you earn up to four credits.

Your benefit amount is also based on your highest 35 years of earnings. If you worked fewer than 35 years, zeros are counted in the calculation, which lowers your average. This is why people who take time out of the workforce may receive lower benefits than those with consistent earnings.

Checking your Social Security tax record

You can view how much you have paid in Social Security tax by creating an account on ssa.gov and accessing your Social Security statement. This statement shows your earnings history year by year and the total amount you have contributed to Social Security.

The statement also estimates what your retirement, disability, or survivor benefits might be based on your current earnings record. You can check this record at any time, and it is a good idea to review it every few years to make sure your employer has reported your earnings correctly.

If you find an error in your earnings record — for example, wages that were not reported or were reported under the wrong name or Social Security number — you should contact Social Security to correct it. Errors can affect your future benefit amount, so catching them early matters.

What happens when you reach the wage base limit

Once your earnings reach the annual wage base, your employer stops withholding Social Security tax from your paychecks for the rest of that year. If you earn $168,600 in 2024, you stop paying the 6.2% tax after that point. Your employer also stops paying their 6.2% share.

This is different from Medicare tax, which has no wage base limit. You pay Medicare tax (1.45% employee, 1.45% employer) on all your earnings, no matter how much you make. High earners also pay an additional 0.9% Medicare tax on wages above $200,000 (single filers).

If you change jobs during the year and your new employer does not know you have already reached the wage base at your previous job, they may withhold more Social Security tax than you owe. When this happens, you claim the overpayment as a refund on your tax return.

Changes to the wage base and tax rate

The Social Security wage base increases most years based on changes in average national wages. The tax rate itself — 6.2% for employees and 6.2% for employers — has remained the same since 1990. Congress would have to pass new legislation to change the rate.

The wage base is adjusted annually to keep Social Security's funding stable as wages rise. For example, the wage base was $160,200 in 2023 and $168,600 in 2024. The Social Security Administration announces the new wage base each October for the following year.

These adjustments mean your Social Security tax may increase from year to year if your income stays the same, simply because the wage base has risen. However, your benefit estimates also adjust upward to reflect these higher contributions.

Frequently Asked Questions

Can I opt out of paying Social Security tax?

No. Social Security tax is mandatory for all workers in the United States, with very limited exceptions. Some government employees hired before 1984 who are covered by a different pension system may be exempt, but most workers must pay. Self-employed workers also cannot opt out.

What if I did not work long enough to get Social Security credits?

You need 40 credits (roughly 10 years of work) to receive retirement benefits. If you have fewer credits, you will not receive a retirement benefit based on your own record. However, you may be able to receive benefits as a spouse or survivor if a family member is receiving Social Security.

Does Social Security tax go toward Medicare?

No. Social Security tax (6.2%) and Medicare tax (1.45%) are separate. Social Security tax funds retirement, disability, and survivor benefits. Medicare tax funds hospital insurance and other Medicare benefits. Both are withheld from your paycheck, but they go to different programs.

What happens to my Social Security contributions if I die before retirement?

Your family members may receive survivor benefits based on your earnings record. Your spouse, children under 19 (or 23 if in school), and dependent parents may all be may be able to access. The total amount paid to your family is based on what you contributed to Social Security during your working years.

How do I know if my employer is withholding the correct amount?

Check your pay stub each time you are paid. The Social Security tax withheld should be 6.2% of your gross wages (up to the annual wage base). Your annual W-2 form also shows total Social Security tax withheld for the year. If the amount seems wrong, contact your employer's payroll department to verify.