W-4 Form Explained (2026): The 5 Steps, and Why Allowances Are Gone
Your employer uses the Form W-4 you submit to figure how much federal income tax to withhold from each paycheck. A correct W-4 means you neither loan the government a large refund nor owe a painful bill in April. Here is how the current form works.
Why the Old "Allowances" Disappeared
Before 2020, you claimed a number of allowances on the W-4. The IRS retired that system because allowances no longer reflected the actual tax law after major reform. The redesigned form asks for facts—your filing status, household income, dependents, and deductions—and uses worksheets to turn them into the right withholding. If you have an old W-4 on file, your payroll keeps applying it, but a new job or life change means using the current version.
The Five Steps
- Step 1 — Personal information: name, address, Social Security number, and filing status (Single, Married filing jointly, or Head of household).
- Step 2 — Multiple jobs / working spouse: only complete if you (or your spouse) have more than one job. This prevents under-withholding, since each employer otherwise assumes that job is your only income.
- Step 3 — Dependents & credits: the form's worksheet converts qualified dependents and certain credits into a dollar amount for your withholding.
- Step 4 — Other adjustments (optional): 4(a) other income not subject to withholding, 4(b) deductions beyond the standard deduction, 4(c) extra withholding per paycheck.
- Step 5 — Signature: sign and date; your employer cannot process it without this.
The Multiple-Jobs Trap
Step 2 is the most common fix for a surprise tax bill. If you work two part-time jobs, each employer withholds as if that were your only income—so the combined withholding lands in lower brackets than your real total. That under-withholding shows up at filing. Completing Step 2 (or using the IRS Tax Withholding Estimator) corrects it. The same logic applies to married couples where both spouses earn.
Tuning Withholding: Over vs. Under
Getting a huge refund means you over-withheld and gave the IRS an interest-free loan. Getting a big bill means you under-withheld. Either way, the lever is a new W-4:
- To reduce a refund, lower withholding via Step 2/3 or enter a smaller (or negative) extra amount in Step 4(c).
- To avoid owing, add extra withholding in Step 4(c) or complete Step 2 if you skipped it.
Our overtime tax guide covers why variable pay makes withholding especially worth checking.
State W-4s Are Separate
Many states have their own withholding form (often modeled on the federal W-4 but not identical). Updating your federal W-4 does not change your state withholding—check your state's form separately. In the nine states with no broad personal income tax, there is no state W-4 at all.