Complete FICA Tax Guide

Understanding Social Security and Medicare taxes, wage base limits, and additional Medicare tax.

Overview

This comprehensive guide covers complete fica tax guide for United States. Understanding payroll tax in United States is essential for compliance and effective tax planning. This guide walks you through the key concepts, requirements, and best practices to help you navigate the tax landscape confidently.

Last updated: July 2026.

Key Topics

1. What is FICA?

FICA (Federal Insurance Contributions Act) is the payroll tax that funds Social Security and Medicare. Employees pay 6.2% for Social Security and 1.45% for Medicare, totaling 7.65%. Employers match these exact amounts, making the total FICA contribution 15.3% (7.65% employee + 7.65% employer). Self-employed individuals pay the full 15.3% through SE tax but can deduct the employer-equivalent portion.

2. Social Security Wage Base Limit

The Social Security tax of 6.2% only applies to earnings up to the annual wage base cap. In 2025, the cap is $176,100. Any earnings above this threshold are not subject to Social Security tax. This creates a natural ceiling on the maximum Social Security tax you will pay in a year, and for high earners, it effectively becomes a lower effective rate.

3. Additional Medicare Tax

An Additional Medicare Tax of 0.9% applies to wages, compensation, and self-employment income exceeding $200,000 for single filers, $250,000 for married filing jointly, and $125,000 for married filing separately. Unlike the Social Security cap, there is no income ceiling for the Additional Medicare Tax — it applies to all earnings above the threshold.

Step-by-Step Guide

Identify Your Earned Income

Determine your total wages, salaries, tips, and net self-employment earnings subject to FICA tax.

Check the Wage Base Cap

Compare your earnings to the current year Social Security wage base cap. Income above the cap is not subject to the 6.2% Social Security tax.

Calculate Regular FICA

Apply 6.2% Social Security tax (up to the cap) and 1.45% Medicare tax to your eligible earnings.

Check for Additional Medicare Tax

If your earnings exceed $200,000 (single) or $250,000 (married filing jointly), calculate the 0.9% Additional Medicare Tax on the excess.

Verify Withholding

Check your pay stub or Form W-2 to confirm the correct amount of FICA was withheld or remitted.

Tips & Best Practices

Self-employed individuals should set aside 15.3% of net self-employment income to cover both the employee and employer FICA portions.
The Additional Medicare Tax is reported on Form 8959 and may trigger a tax liability even when your employer has already withheld the standard rate.

Official Resources

For the most accurate and up-to-date information, visit the official tax authority:

Internal Revenue Service (IRS)