Federal Income Tax
Federal income tax is one of the largest deductions from your paycheck. It is calculated based on the IRS’s 2025 tax brackets and individual elections on Form W-4. Factors that determine how much is withheld include:
- Filing Status: Single, married filing jointly, head of household, etc.
- Dependents: Claiming dependents can reduce taxable income.
- Additional Withholding: You may request extra withholding amounts to cover other tax liabilities.
The IRS updates tax brackets annually to account for inflation, which means withholding amounts may change slightly year over year. For the most accurate withholding, review your W-4 regularly and update it when major life changes occur, such as marriage or having children.
FICA Taxes
Federal Insurance Contributions Act (FICA) taxes fund Social Security and Medicare programs, which provide essential benefits for retirees, disabled individuals, and survivors.
- Social Security Tax: Employees pay 6.2% of their gross wages, up to the wage base limit of $167,700 in 2025. Employers match this amount, contributing an additional 6.2%. Self-employed individuals pay the full 12.4%.
- Medicare Tax: Medicare taxes are calculated at 1.45% of all wages. High earners—those earning more than $200,000 (single filers) or $250,000 (married filing jointly)—pay an additional 0.9% on income exceeding these thresholds.