- Step 1 — name, SSN and filing status (single, married filing jointly, head of household).
- Step 2 — multiple jobs or a working spouse. Use the IRS estimator or check the box if both jobs pay similarly; otherwise you will likely under-withhold.
- Step 3 — dependents: multiply qualifying children and other dependents by the credit amounts on the form.
- Step 4 — (a) other income, (b) deductions beyond the standard deduction, (c) extra withholding per paycheck.
- Step 5 — sign.
Withholding too much gives you a refund (an interest-free loan to the IRS); too little can mean a bill and penalties. Use the official IRS Tax Withholding Estimator for precise results, and our take-home pay calculator for a quick estimate.