W-4 Withholding Calculator

Annual salary feeds directly into taxable income (annualSalary - allowances * 4,300, line 20), and that taxable income is what the progressive federal brackets apply to. Raising salary raises taxable income dollar for dollar, which raises tax owed at your current or a higher marginal bracket -- it's the input this calculator responds to most under normal (zero or modest additional withholding) conditions.

Each allowance claimed shields a fixed $4,300 of salary from taxation before the brackets are applied (line 19-20). At a 22% marginal bracket, that's roughly $946 less annual tax per allowance claimed; the exact savings depend on which bracket that $4,300 falls in, since brackets are applied progressively rather than at one flat rate.

Yes. Additional Withholding is entered per paycheck and multiplied by 26 pay periods before being added straight to the annual total (line 27-28), bypassing the bracket calculation entirely. A large additional withholding amount is added dollar for dollar, so at high enough values it can move your annual and per-paycheck totals more than a moderate salary change would.

Not exactly. This calculator uses the older, pre-2020 allowance concept ($4,300 per allowance) for simplicity, but the IRS redesigned Form W-4 in 2020 to remove allowances entirely in favor of dollar-amount adjustments and dependent credits. Treat this as an educational approximation of your withholding, not a replacement for the official IRS Tax Withholding Estimator or your actual W-4 filing.