How federal paycheck withholding works

Last updated: 2026-08-14

Federal withholding is the income tax your employer withholds from each paycheck and sends toward your annual tax bill. It is not the same as final tax owed; it is a paycheck-by-paycheck estimate based on payroll rules and W-4 information.

Inputs that change withholding

Filing status, multiple-job settings, dependents, other income, deductions, and extra withholding can all change the federal amount withheld. Pay frequency matters because payroll systems convert a single paycheck into an annualized estimate.

Why a refund or balance due can happen

Withholding may be too high or too low when income changes, bonuses arrive, two jobs are involved, deductions change, or credits are entered differently from the final return.

Use the calculator

Use the W-4 withholding calculator to compare W-4-style inputs. For a full paycheck estimate, open the U.S. paycheck calculator.