Paycheck Withholding Basics: Why Gross Is Not Take-Home
A clear US walkthrough of federal, FICA, and state withholding — and how to use a take-home estimator without treating it as a W-4 replacement.
Updated 2026-07-15 · Not financial advice
Gross vs net is where friction starts
Offer letters advertise gross salary. Your bank balance reflects net after income tax withholding and FICA. Confusing the two creates cash-flow mistakes on day one of a new job.
FeeFriction’s paycheck take-home calculator is a scenario tool: enter gross, pay frequency, a flat state rate, and pre-tax deferrals to see an educational net.
Federal income tax is progressive
Marginal brackets mean only dollars above each threshold face the higher rate. Average (effective) tax is usually lower than your top marginal rate.
Withholding tables (IRS Publication 15-T) are not identical to year-end tax — refunds and balances-due happen when withholding and liability diverge.
FICA is separate
Social Security and Medicare withholding fund separate programs. Wage bases and additional Medicare thresholds change over time — verify current SSA/IRS figures for filing year math.
Self-employment has different mechanics (SE tax). This guide focuses on common W-2 paycheck friction.
State and local layers
Texas and Florida generally do not tax wage income at the state level; California and New York do — sometimes with local add-ons. Always confirm before comparing offers across states.
Use state pages on FeeFriction for narrative context, then payroll documents for ground truth.
Related tool: paycheck take home · inflation vs raise · 401k fee drag
Sources
FAQ
Frequently asked questions
Can this replace my W-4? +
No. W-4 decisions affect withholding legality and refunds; use IRS tools and payroll, not this site.
Do pre-tax 401(k) contributions lower take-home? +
They lower taxable wages and current paycheck cash, while shifting money into retirement accounts — model both.