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How to Fill Out Form W-4 (2026)

The W-4 is the form that tells your employer how much federal tax to withhold. Five steps, ten minutes — here is exactly what each one does. Last reviewed: October 2026 — reflects 2026 rules and limits.

What the W-4 actually does

It does not change your taxes — it changes your withholding: the estimate sent to the IRS from each paycheck. Fill it out well and April is boring (in the good way). Fill it out badly and you either lend the IRS money interest-free all year or rack up an April bill. Since the 2020 redesign there are no more "allowances" — the form asks direct questions instead.

The five steps

  1. Personal information + filing status. Single, married filing jointly, or head of household. This single choice moves the standard deduction applied to your withholding ($16,100 single vs. $32,200 married for 2026).
  2. Two jobs or a working spouse. The simplest accurate option for households with two similar jobs is the checkbox in Step 2(c) — it splits the brackets between the jobs. Skipping this step is the #1 cause of under-withholding.
  3. Dependents. The child tax credit ($2,000 per qualifying child) and $500 credit for other dependents — these reduce withholding directly.
  4. Optional adjustments. Other income (interest, side gigs), itemized deductions beyond the standard, and extra withholding per pay period — the dial for fixing a stubborn refund-or-bill pattern.
  5. Sign and date. Unsigned forms go back to default (single, no adjustments) — usually too much withholding.

When to submit a new one

  • Starting any new job (required)
  • Marriage, divorce, or a new child
  • A side income grew or shrank significantly
  • Your refund or balance due last year was more than a few hundred dollars
Sanity check: after updating your W-4, compare the next stub against our state paycheck calculator — if federal withholding is far off the single-filer estimate, the form was probably entered wrong.

Frequently asked questions

Is the W-4 the same as a W-2?

No. The W-4 is what you fill out so your employer knows how much to withhold. The W-2 is what the employer sends you (and the IRS) each January summarizing what was actually paid and withheld.

What if I have two jobs?

Use the Step 2(c) checkbox on both W-4s if the jobs pay similarly, or the IRS withholding estimator / Step 2(b) worksheet if they differ a lot. The goal is that the two jobs together cover the tax of your combined income.

Can I write “exempt” on the W-4?

Only if you had no federal income tax liability last year and expect none this year. Writing exempt otherwise creates an under-withholding problem — with interest — at tax time.

Why do I keep getting a big refund?

Your withholding exceeds your actual tax. Add a Step 4(c) extra amount? No — do the opposite: reduce withholding (or add credits in Step 3) so the refund shrinks and your paychecks grow.