Two people can earn the exact same salary and take home very different amounts. This calculator shows why — it stacks federal income tax, FICA, and state withholding on top of each other and divides by your pay schedule to estimate your net paycheck. It is an educational estimate, not tax advice.
The three layers of paycheck tax
Your gross pay is reduced by three separate taxes. Federal income tax applies 2026 IRS brackets to your income after the standard deduction. FICA is a flat 7.65% payroll tax — 6.2% for Social Security (only up to the $184,500 wage base) plus 1.45% for Medicare (no cap, with a 0.9% surtax on high earners). State income tax varies enormously: nine states take nothing, while California and New York run progressive brackets above 10% at the top.
Because federal tax and FICA are the same everywhere, the difference between two states is entirely the state line — which is exactly what the State Comparison tab isolates.
Why pay frequency changes the number (but not the total)
Weekly, biweekly, semimonthly, and monthly schedules pay out 52, 26, 24, and 12 times a year. The same annual pay divided by more checks means a smaller amount per check, but your yearly take-home is identical. Biweekly (26 checks) and semimonthly (24 checks) are easy to confuse — biweekly gives you two extra checks a year, so each one is a bit smaller.
Pre-tax deductions such as a 401(k) contribution or health premium lower the income that federal and state tax are figured on, so they cut your tax bill while moving money toward retirement or benefits.
What this estimate does not include
This is a planning estimate. Your real withholding depends on the details of your Form W-4, and the tool does not model local city or county income taxes (such as NYC), state disability insurance (such as California SDI), post-tax deductions, or the exact way your employer's payroll software withholds. It computes FICA on your full gross wages, so if a large share of your pre-tax deductions are Section-125 health or HSA amounts (which are FICA-exempt), your real take-home may be slightly higher. Bonuses are withheld differently — see the Bonus Tax calculator. Always confirm your actual numbers against your pay stub, the IRS, or a tax professional.