How to Fill Out a W-4 (2026), Step by Step

The redesigned W-4 has five steps, but most people only fill in two of them. This walkthrough covers every line in order, flags the ones you can skip, and explains the choices that actually move your withholding.

Before you start, have your filing status in mind and, if you are coordinating with a spouse or a second job, both recent pay stubs nearby. Then work top to bottom.

Step 1: Personal information

Enter your name, address, and Social Security number, then pick a filing status: single or married filing separately, married filing jointly or qualifying surviving spouse, or head of household. This step is required, and your status choice is the single biggest lever on the form. It sets which withholding table your employer uses and how much standard deduction is baked in.

Married couples where both people earn should read Step 2 before assuming that married filing jointly alone will withhold enough.

Step 2: Account for multiple jobs

Skip this step if you hold exactly one job and, if married, your spouse does not work. Complete it if you have more than one job at the same time, or if you are married filing jointly and both of you earn.

The reason matters. Each employer withholds as though the pay it sees is your only income for the year. Two jobs each withholding that way will, combined, take out too little, because they both apply the low end of the brackets and the full standard deduction. Step 2 fixes the gap. You have three ways to do it:

• The checkbox in 2(c). The simplest option. Check it on the W-4 for both jobs when there are only two and they pay roughly the same. Both employers then withhold at a higher rate that assumes a second income.
• The IRS estimator. The most accurate option for uneven pay. It reads your details and tells you what to enter.
• The multiple-jobs worksheet. A middle path you complete by hand using the tables attached to the form.

Only one spouse should fill in Steps 3 and 4, usually the higher earner. Doing it on both W-4s double-counts the same dependents and adjustments.

Step 3: Claim dependents and credits

This step captures the child tax credit and the credit for other dependents. The form prints the per-child amount, a smaller amount for other dependents, and the income limit above which the step does not apply. You count your qualifying dependents, multiply by the printed amounts, and write the total.

Because this is a credit, it reduces withholding directly, not just as a deduction against income. Claiming dependents here lowers the tax held from each paycheck. Leaving it blank when you qualify means more is withheld and you recover it as a refund later.

Step 4: Other adjustments (optional)

Step 4 fine-tunes the result. It has three lines, all optional:

• 4(a) Other income. Enter income with no withholding of its own, such as interest, dividends, or self-employment earnings, so your job can cover the tax on it.
• 4(b) Deductions. Use this only if you itemize or claim other deductions beyond the standard deduction. It reduces the income your employer treats as taxable.
• 4(c) Extra withholding. A flat amount taken from every paycheck on top of the normal calculation. This is the direct dial for anyone who wants a bigger cushion. See extra withholding on the W-4 for how to size it.

Step 5: Sign and date

The form is not valid until you sign it. An unsigned W-4 cannot be accepted, and your employer will withhold as if you filed nothing. Sign, date, and hand it back to payroll or your HR system.

Common mistakes to avoid

• Filling in Step 3 on both spouses' forms. Claim dependents on one W-4 only, or you will badly under-withhold.
• Ignoring Step 2 with two incomes. This is the most common cause of a surprise April bill.
• Treating the old "allowances" as still relevant. The current form has none. If you are copying an old form, the numbers do not translate.
• Claiming exempt without qualifying. Exempt is only for those with no tax last year and none expected this year.
• Setting it and forgetting it. Marriage, a new baby, or a second job all change the right answer.

When you are done, model the form before you trust it. Run your numbers through the take-home pay calculator and compare its estimate with your next stub. If they disagree, revisit Step 2, Step 3, or line 4(c) and check again. Our overview of the W-4 explains how the whole form fits together.