How to Fill Out a W-4 Form (Step-by-Step)

Updated for 2025–2026 · Educational guidance, not tax advice

The W-4 form has five sections. Most people only need to fill out two of them. This guide walks through every box in plain English.

Step 1 — Personal Information

Step 1 has three parts: (a) your name and address, (b) your Social Security number, and (c) your filing status.

• (a) Name and address: Use your legal name as shown on your Social Security card. If you recently got married or changed your name, update SSA first.
• (b) SSN: Write your Social Security number. Do not use an ITIN here — the W-4 requires an SSN.
• (c) Filing status: Check one of three boxes:
  • Single or Married filing separately
  • Married filing jointly or Qualifying surviving spouse
  • Head of household — you are unmarried and pay more than half the cost of keeping up a home for a qualifying person (typically a child)

Step 2 — Multiple Jobs or Working Spouse

Only complete Step 2 if one of these is true:

• You have more than one job at the same time, or
• You are married filing jointly and your spouse also works

If you have only one job and no working spouse, leave Step 2 blank and skip to Step 3.

If Step 2 applies to you, the IRS gives three options:

1. Option (a): Use the IRS online estimator at irs.gov/W4App — most accurate.
2. Option (b): Fill out the Multiple Jobs Worksheet on page 3 of the W-4.
3. Option (c): Check the box in Step 2(c) — only do this if both jobs pay similar amounts.

Step 3 — Claim Dependents

This is where most people save money. Step 3 reduces the amount of tax withheld from your paycheck.

Only complete Step 3 if your total income will be under $200,000 (or under $400,000 if married filing jointly).

Example: Two kids under 17 and one elderly parent you support:

• Line 1: 2 × $2,000 = $4,000
• Line 2: 1 × $500 = $500
• Line 3 (total): $4,500 ← write this on Step 3

More dependent-claiming rules and edge cases: W-4 Dependents Guide »

Step 4 — Other Adjustments (Optional)

Most people leave Step 4 blank. Only fill it out if one of these applies:

• 4(a) Other income: You have income that is not from a W-2 job and has no withholding — for example, interest, dividends, or side-hustle income. Enter the annual amount.
• 4(b) Deductions: You itemize and your deductions exceed the standard deduction. Use the Deductions Worksheet on page 3 to calculate.
• 4(c) Extra withholding: You want extra tax taken out of every paycheck. Popular use case: you had a surprise tax bill last year and want to avoid that again. Enter a dollar amount per pay period.

Step 5 — Sign and Date

Sign, date, and hand the form to your employer (usually HR or payroll). The W-4 is not filed with the IRS — your employer keeps it on file and uses it to calculate withholding.

How to claim "Exempt" on your W-4

If you had no federal income tax liability last year AND expect none this year, you can claim exempt — meaning no federal income tax is withheld from your paychecks.

How to claim it:

1. Fill out Step 1 (name, address, SSN, filing status)
2. Leave Steps 2, 3, and 4(a), 4(b) blank
3. In the blank space below Step 4(c), write the word "Exempt"
4. Sign and date Step 5

Exempt status expires every year on February 15. You must submit a new W-4 annually to remain exempt. Full exempt rules »

Common W-4 mistakes

• Claiming exempt when you will owe tax. You will face a surprise bill plus possible penalties.
• Forgetting to update after major life events. Marriage, divorce, new baby, second job, child turns 17 — all change your withholding.
• Double-counting dependents in married filing jointly households. Only one spouse should claim the dependents in Step 3 (usually the higher earner).
• Leaving Step 2 blank when you have two jobs. Each employer will withhold as if yours is the only job, causing under-withholding.
• Using the wrong filing status. Filing as Head of Household when you do not qualify is a common error — the IRS definition is strict.