The Social Security payroll tax is 12.4% of your wages, split between you and your employer

The Social Security payroll tax is a fixed percentage of your earnings that funds the Social Security program. You pay 6.2% of your wages, and your employer pays another 6.2%, for a total of 12.4%. If you are self-employed, you pay both portions yourself — 12.4% total — though you can deduct half of it on your tax return.

This tax applies only to wages up to a certain limit, called the wage base. In 2024, you pay Social Security tax on earnings up to $168,600. Any income above that threshold is not subject to the tax. This wage base changes each year based on national wage trends, so the dollar amount you see in 2025 or later will be different.

The money you and your employer pay does not go into a personal account with your name on it. Instead, it goes into a single trust fund that pays benefits to current retirees, disabled workers, and survivors of deceased workers. Your future benefits are based on your earnings record and age when you claim, not on how much you personally paid in.

Key Takeaways

  • You pay 6.2% of your wages in Social Security tax, and your employer pays another 6.2%, unless you are self-employed and pay the full 12.4%.
  • The tax applies only to wages below the annual wage base limit, which was $168,600 in 2024 and changes each year.
  • Social Security tax funds current benefits for retirees, disabled workers, and survivors, not a personal retirement account in your name.
  • Your Social Security benefit amount depends on your lifetime earnings record and the age at which you claim, not the total tax you paid.
  • Self-employed workers pay both the employee and employer portions but can deduct half of the total tax on their federal income tax return.

How the wage base limit affects what you pay

The wage base limit means that high earners pay a smaller percentage of their total income in Social Security tax than lower earners do. If you earn $168,600 in 2024, you pay 6.2% on all of it. If you earn $250,000, you pay 6.2% only on the first $168,600 and nothing on the remaining $81,400.

This limit is adjusted each January based on the average wage index from two years prior. The Social Security Administration publishes the new wage base in October of the preceding year, so you know the amount before the tax year begins. The limit has increased nearly every year since the program started, though the increase varies — sometimes it rises by a few hundred dollars, sometimes by several thousand.

If you have multiple jobs, you may pay Social Security tax on more than the wage base in a single year. For example, if you earn $100,000 at one job and $80,000 at another, you will pay the tax on both amounts even though the combined total exceeds the limit. You can claim a credit for the overpayment when you file your federal income tax return.

Where Social Security tax money goes

Social Security tax revenue flows into the Old-Age, Survivors, and Disability Insurance (OASDI) Trust Fund. This single fund pays three types of benefits: retirement benefits to workers age 62 and older, disability benefits to workers who cannot work due to a medical condition, and survivor benefits to the spouses and children of deceased workers.

In any given month, the trust fund pays out benefits to millions of people. The money comes directly from current tax revenue — not from savings or investments. This is called a "pay-as-you-go" system. When tax revenue exceeds benefit payments, the surplus goes into reserves. When benefit payments exceed tax revenue, the reserves are drawn down. The trustees of Social Security publish annual reports on the fund's status and project when reserves may be depleted if no changes are made to the program.

A small portion of Social Security tax revenue also goes to administrative costs, such as processing applications and maintaining the earnings records that determine benefit amounts. This administrative cost is typically less than 1% of total revenue.

How your earnings record connects to future benefits

Social Security uses your Primary Insurance Amount (PIA) to calculate your benefit. The PIA is based on your highest 35 years of earnings, adjusted for inflation. The Social Security Administration maintains an earnings record for every worker and updates it each year based on W-2 forms or self-employment tax returns.

You can view your earnings record by creating an account on ssa.gov and accessing your Social Security Statement. This statement shows your estimated retirement, disability, and survivor benefits based on your current earnings record. It also lists your year-by-year earnings history, so you can check for errors. If you find a mistake, you must report it to Social Security within three years, three months, and 15 days of the year in which the error occurred.

Your actual benefit amount also depends on when you claim. If you claim at your full retirement age (which ranges from 66 to 67 depending on your birth year), you receive your full PIA. If you claim earlier, your benefit is reduced. If you delay claiming past your full retirement age, your benefit increases by about 8% per year until age 70.

Self-employed workers and Social Security tax

If you are self-employed, you pay Social Security tax through self-employment tax on your net business income. The rate is 12.4% for Social Security and 2.9% for Medicare, for a total of 15.3%. You calculate self-employment tax on Schedule SE and report it with your federal income tax return.

The self-employment tax applies to net earnings above $400. If your net business income is less than $400, you do not owe self-employment tax, though you may still want to file a return to claim refundable tax credits. The wage base limit for Social Security self-employment tax is the same as for employees — $168,600 in 2024 — so earnings above that amount are subject only to the Medicare portion.

You can deduct half of your self-employment tax on your federal income tax return. This deduction reduces your taxable income but does not reduce the amount of self-employment tax you owe. The deduction is taken on Form 1040 and is available whether you itemize deductions or take the standard deduction.

What happens if you work while receiving Social Security

If you claim Social Security before your full retirement age and continue to work, your benefits may be temporarily reduced. In 2024, Social Security reduces your benefit by $1 for every $2 you earn above $23,400. The earnings limit applies only to wages and self-employment income, not to investment income, pensions, or other sources.

The reduction applies only in the years before you reach your full retirement age. Once you reach full retirement age, you can earn any amount without a reduction to your benefits. Additionally, even though your benefit is reduced in the early years, Social Security recalculates your benefit amount at full retirement age to account for the months you did not receive payments, so you are not permanently penalized.

You continue to pay Social Security tax on your wages even if your benefits are reduced due to earnings. This additional tax goes into your earnings record and may increase your future benefit amount.

Frequently Asked Questions

Can I opt out of paying Social Security tax?

No. Social Security tax is mandatory for all employees and self-employed workers with net earnings of $400 or more. The only exceptions are certain government employees hired before 1984 who are covered by their own pension systems, and some religious groups that have obtained a specific exemption from the Internal Revenue Service.

Does Social Security tax go toward Medicare?

No. Social Security tax (12.4%) and Medicare tax (2.9%) are separate payroll taxes. Social Security tax funds retirement, disability, and survivor benefits. Medicare tax funds hospital insurance and other medical coverage. Both are withheld from your paycheck, but they support different programs.

What if I never paid Social Security tax?

You must have earned income subject to Social Security tax to receive retirement or disability benefits. If you have no earnings record or a very small one, you may not be may have access to to benefits based on your own work. However, you may be may have access to to benefits as a spouse, ex-spouse, or dependent of someone who has a may have access to earnings record.

Does the wage base limit mean rich people pay less?

Yes, in percentage terms. A person earning $168,600 pays 6.2% of their total income in Social Security tax. A person earning $500,000 pays 6.2% only on the first $168,600, which is about 2% of their total income. This is by design — Social Security was created to replace a portion of lower and middle-income workers' earnings, not to tax all income equally.

How do I check if my Social Security tax was reported correctly?

Create an account on ssa.gov and view your Social Security Statement. It shows your year-by-year earnings history. If you see an error, contact Social Security directly. You have three years, three months, and 15 days from the end of the year in which the error occurred to report it and request a correction.