The FICA tax rate is 15.3% of your wages, split between you and your employer

FICA taxes consist of two parts: Social Security at 6.2% and Medicare at 2.9%. Your employer pays an equal 15.3% on your behalf. If you are self-employed, you pay the full 15.3% yourself, though you can deduct half of it on your tax return.

The rate itself does not change year to year. What changes is the wage base — the maximum income subject to Social Security tax. For 2024, Social Security tax applies only to the first $168,600 of your wages. Medicare tax has no wage cap and applies to all your earnings.

This means if you earn $200,000 in a year, you pay Social Security tax on only $168,600 of it, but Medicare tax on the full $200,000. The wage base adjusts annually based on national wage trends, so the dollar amount changes but the percentage rate stays fixed.

Key Takeaways

  • Social Security tax is 6.2% of your wages up to the annual wage base ($168,600 in 2024), and Medicare tax is 2.9% of all wages with no cap.
  • Your employer pays an equal amount on your behalf, so the total FICA cost to the employer is 15.3%, though you see only your half deducted from your paycheck.
  • The wage base for Social Security increases each year to reflect wage growth, but the tax rate percentages themselves do not change.
  • Self-employed workers pay the full 15.3% but can deduct half of it as a business expense on their tax return.

Why there is a wage cap for Social Security but not Medicare

Social Security was designed as an insurance program where benefits are tied to your earnings history. The wage base cap reflects the program's original structure: higher earners receive higher benefits, but only up to a maximum. Once you earn above the wage base, additional income does not increase your future Social Security benefit.

Medicare, by contrast, is structured differently. It provides the same hospital insurance (Part A) to all workers regardless of how much they earned. Because the benefit structure does not scale with income the way Social Security does, there is no wage cap. You pay Medicare tax on every dollar you earn.

How the wage base changes each year

The Social Security Administration adjusts the wage base annually based on the National Average Wage Index, which measures average earnings across the country. If average wages rise 3% in a given year, the wage base typically rises by roughly 3% as well.

The new wage base takes effect on January 1 each year. Your employer's payroll system automatically applies the new limit, so you do not need to do anything. If you work for multiple employers or change jobs mid-year, each employer applies the wage base independently — you could theoretically overpay Social Security tax if your combined earnings across employers exceed the wage base, though you can claim a credit on your tax return.

What happens when you reach the wage base

Once your cumulative wages for the year hit the wage base limit, your employer stops deducting Social Security tax from your paycheck. Medicare tax continues for the rest of the year. This is why people who earn significantly above the wage base see their FICA deduction drop partway through the year.

For example, if the 2024 wage base is $168,600 and you earn $200,000, you pay Social Security tax on the first $168,600 (6.2% = $10,453.20) and then zero Social Security tax on the remaining $31,400. You pay Medicare tax on the full $200,000 (2.9% = $5,800).

Self-employed FICA rates and the deduction

If you are self-employed, you pay both the employee and employer portions of FICA, totaling 15.3%. This is called self-employment tax. You calculate it on your net business income (revenue minus business expenses) using Schedule SE, which you file with your tax return.

The tax code allows you to deduct half of your self-employment tax as an adjustment to income on your tax return. This partially offsets the fact that you are paying both sides of the tax. The deduction reduces your taxable income but does not reduce the FICA tax itself — you still owe the full 15.3%.

FICA rates for household employees and agricultural workers

If you employ a household worker (nanny, housekeeper, gardener) and pay them $2,700 or more in a year, you must pay FICA taxes on their wages. The rate is the standard 15.3% split. You report this on Schedule H when you file your taxes.

Agricultural workers follow the same FICA rules as other employees. If you hire farm labor and pay an individual $150 or more in cash wages in a calendar year, you must withhold and pay FICA taxes on those wages.

Frequently Asked Questions

Can I opt out of paying FICA taxes?

No. FICA taxes are mandatory for all employees and self-employed workers with net earnings of $400 or more per year. The only exceptions are certain religious groups that have obtained a formal exemption from the IRS, and some nonresident aliens on specific visa types. Most workers cannot opt out.

What if I work for two employers and overpay Social Security tax?

If your combined wages across multiple employers exceed the wage base in a single year, you may overpay Social Security tax. You can claim a credit for the overpayment on your tax return (Form 1040, line 24). The IRS will refund the excess when you file.

Do independent contractors pay FICA taxes?

Yes, but they pay self-employment tax instead of having an employer withhold FICA. Independent contractors owe 15.3% on net business income. They calculate and pay this tax quarterly using estimated tax payments, or pay it in full when they file their annual tax return.

Does FICA tax apply to tips?

Yes. Tips are considered wages and are subject to FICA tax. If you receive tips, you must report them to your employer, and FICA tax is withheld from your paycheck just like regular wages. Tips above the wage base are still subject to Medicare tax.