Summary

FICA, short for the Federal Insurance Contributions Act, is a payroll tax that funds two critical federal programs: Social Security and Medicare. These taxes are shared between employees and employers, although self-employed individuals must pay the full amount. Understanding how FICA works is essential to grasp how much is being deducted from your income and why.

💸 How FICA Tax Works

FICA tax combines two separate federal contributions: Social Security and Medicare. In total, it accounts for 15.3% of your earnings. If you work for an employer, you are responsible for 7.65%, while your employer covers the remaining 7.65%. Specifically, 6.2% goes to Social Security and 1.45% to Medicare. For self-employed workers, there’s no employer to split the bill, so the full 15.3% is paid out-of-pocket, though you can deduct half of that amount when filing taxes. These amounts are typically withheld from your paycheck and show up under different labels, such as “OASDI” for Social Security. Medicare taxes do not have an income cap, but Social Security taxes apply only to earnings up to $168,600 in 2024 and $176,100 in 2025.

Takeaways:

• Employees and employers split FICA taxes, totaling 15.3% of wages.

• Social Security tax applies only up to an annual income cap, while Medicare tax applies to all earnings.

• Self-employed individuals must pay the entire FICA tax but can deduct half when filing taxes.

Key Terms

• FICA: The Federal Insurance Contributions Act tax that funds Social Security and Medicare.

• OASDI: Old-Age, Survivors, and Disability Insurance, another term for the Social Security portion of FICA.

• Self-Employment Tax: The full 15.3% FICA tax paid by self-employed individuals.

📊 FICA Tax Rates for 2024 and 2025

The Social Security wage cap changes annually. In 2024, only the first $168,600 in earnings is subject to the 6.2% Social Security tax. This cap increases to $176,100 in 2025. The Medicare portion remains steady at 1.45%, with no income limit. However, high earners are subject to an extra 0.9% Medicare surtax. This surtax applies to income over $200,000 for single filers, $250,000 for joint filers, and $125,000 for married individuals filing separately. Employers are not responsible for matching the 0.9% additional Medicare tax—it’s solely the employee’s responsibility once income thresholds are met.

Takeaways:

• The Social Security wage base cap rises each year—$168,600 in 2024 and $176,100 in 2025.

• A 0.9% Medicare surtax applies to high-income earners, and it’s not matched by employers.

• Employers and employees each pay 6.2% for Social Security and 1.45% for Medicare.

Key Terms

• Medicare Surtax: An additional 0.9% tax on wages above certain thresholds, paid only by employees.

• Wage Base Limit: The maximum earnings subject to Social Security tax.

🧾 Withholding Tax and Related Payroll Taxes

FICA is one type of withholding tax, meaning it is taken directly from an employee’s paycheck by the employer and sent to the government. There are other payroll-related taxes to know as well. FUTA, or the Federal Unemployment Tax Act, funds unemployment benefits at the federal level and is paid only by employers. Similarly, SUTA is a state-level version of the unemployment tax. These taxes don’t reduce employee take-home pay directly, but they are still an employer obligation. For individuals, withholding also includes income tax unless the person qualifies as “exempt,” meaning no federal income tax is withheld. However, even exempt workers still pay FICA taxes.

Takeaways:

• FICA is a withholding tax, automatically deducted from employee wages.

• Employers also pay FUTA and SUTA taxes, which fund unemployment programs.

• Being exempt from income tax does not exempt someone from paying FICA taxes.

Key Terms

• Withholding Tax: A tax collected at the source of income, typically from a paycheck.

• FUTA: Federal Unemployment Tax Act, paid by employers to support unemployment insurance.

• SUTA: State Unemployment Tax Act, a state-level tax paid by employers.

Conclusion

FICA taxes are a key component of the U.S. tax system, ensuring that Social Security and Medicare programs remain funded. Whether you’re an employee seeing these deductions on your pay stub, or a self-employed worker covering the full cost, it’s important to understand how much you’re paying and why. These taxes are mandatory for most workers, and the rules around them—like income caps and surtaxes—can change annually. Staying informed helps you better anticipate what will be withheld from your earnings each year.