Paycheck Calculator

Federal income tax (based on brackets and W-4), Social Security tax (6.2% up to $176,100 wage base in 2025), Medicare tax (1.45%), state income tax (0-13% depending on state), local taxes (in some cities), and voluntary deductions like 401k, health insurance, FSA/HSA contributions.

It depends on your income and W-4 allowances. At $78k/year (single): ~$7,000 federal tax annually ($269/biweekly paycheck). At $100k/year: ~$13,000 annually ($500/biweekly). Submit a new W-4 if your life circumstances change — marriage, children, second job — to avoid under- or over-withholding.

FICA = Federal Insurance Contributions Act. It covers Social Security (6.2%) + Medicare (1.45%) = 7.65% of your gross pay. Your employer pays a matching 7.65%. For self-employed, you pay both halves (15.3%) as self-employment tax. Social Security only applies up to $176,100 in wages (2025).

Possible reasons: employer-paid health, dental, vision premiums deducted pre-tax. HSA or FSA contributions. Union dues. Garnishments. Local/city taxes. Life insurance. Rounding in withholding tables. Your employer may also be withholding extra if you requested it on your W-4 to avoid underpayment.

Increase 401k contributions (reduces taxable income now). Contribute to FSA/HSA (pre-tax). Ensure W-4 reflects correct filing status and dependents. If you consistently get a large tax refund, you are over-withholding — adjust W-4 to increase take-home pay throughout the year instead.