How to Fill Out Form W-4: Steps, Exemptions, and Filing

Form W-4 tells your employer how much federal income tax to take out of each paycheck, and filling it out correctly comes down to five numbered steps: enter your personal information, adjust for multiple jobs if they apply, claim dependents, make any other adjustments, and sign. Steps 1 and 5 are required for every employee. Steps 2, 3, and 4 are only for situations that match yours. Here is how to fill out Form W-4 line by line, plus the details that trip people up.¹

Gather This Before You Start

Four pieces of information make the form go quickly.

Your filing status. The form gives three checkbox choices: single or married filing separately; married filing jointly or qualifying surviving spouse; and head of household, which is for unmarried taxpayers who pay more than half the cost of maintaining a home for a qualifying person.¹ The wrong box throws off your withholding all year.

Pay stubs from every job in your household. If you work more than one job, or you and a spouse both work, you need recent stubs to estimate combined income. Combined earnings can push you into higher brackets that a single employer’s withholding won’t catch.

A count of your dependents. If your total income will be $200,000 or less ($400,000 or less filing jointly), Step 3 lets you claim credits directly. You’ll multiply qualifying children under 17 by $2,200 and other dependents by $500, so know the counts.¹

An estimate of non-wage income and any itemized deductions. Interest, dividends, and retirement distributions belong in Step 4(a). Itemized deductions only matter for Step 4(b) if they exceed the standard deduction. For 2026, the standard deduction is $16,100 for single filers, $32,200 for joint filers, and $24,150 for heads of household.²

Step 1: Personal Information

Enter your legal name, Social Security number, and home address, then check the box for your filing status. Every employee must complete Step 1; without it, the form is invalid.¹ Verify that the SSN matches your card exactly. A mismatch can create problems linking your withholding to your tax account.

Step 2: Multiple Jobs or a Working Spouse

Skip Step 2 if you hold only one job and don’t have a working spouse. Otherwise, this step prevents under-withholding. Two separate employers each apply the tax brackets and standard deduction independently, and that leaves a gap that Step 2 closes.

You have three ways to do it.

Use the IRS Tax Withholding Estimator at irs.gov. It runs the math and gives you a specific dollar amount to enter. This is the most precise option.
Use the Multiple Jobs Worksheet on page 3 of the form. It uses tax tables to produce a dollar amount you enter on line 2(b).
Check the Step 2(c) box on the W-4 for each job. This works when the household has exactly two jobs and the lower-paying one earns more than half of what the higher-paying one earns. Checking the box splits the standard deduction and brackets in half for each job. The wider the pay gap, the less accurate this method becomes, and it tends to overwithhold when one job pays significantly more than the other.¹

Whichever method you pick, the adjustment goes on the W-4 for the highest-paying job in the household.

Step 3: Claim Dependents

Step 3 reduces your withholding to reflect the Child Tax Credit and the credit for other dependents. It’s only available if your income is $200,000 or less, or $400,000 or less on a joint return.¹

On line 3(a), multiply your qualifying children under 17 by $2,200. On line 3(b), multiply your other dependents by $500. Add the two and enter the total on the last line of Step 3.¹ The $2,200 per child figure reflects the current Child Tax Credit amount.³

One warning for two-earner couples: if one spouse claims the dependents on their W-4, the other should not enter the same dependents on theirs. Doubling up causes significant under-withholding.

Step 4: Other Adjustments (Optional)

Step 4 has three independent lines. Use any, all, or none.

Line 4(a), other income. Enter the estimated annual amount of income that won’t already have tax withheld — interest, dividends, retirement distributions. Your employer spreads the extra withholding across your remaining paychecks.¹

Line 4(b), deductions. If your itemized deductions will exceed the standard deduction for your filing status, enter the difference. This reduces your withholding because your taxable income will be lower than the default tables assume.¹

Line 4(c), extra withholding. Enter a flat dollar amount you want withheld from every paycheck on top of what the other calculations produce. This helps if you’ve consistently owed money at filing time.¹

If you skip Step 4 entirely, your withholding runs on filing status and the standard deduction. For many people with straightforward finances, that’s fine.

Step 5: Sign and Date

The form is not valid without your signature. You’re signing under penalty of perjury, certifying that everything you entered is true and correct.¹

Claiming Exempt from Withholding

You can claim exemption from federal income tax withholding only if you had no federal income tax liability last year and expect none this year.¹ This typically fits people with very low income, like a student working part-time over the summer.

To claim it, write “Exempt” in the space below Step 4(c), then complete only Steps 1(a), 1(b), and 5. Leave Steps 2, 3, and 4 blank.¹

An exempt W-4 expires each year. To stay exempt for the next year, you must submit a new W-4 by February 15. If that date falls on a weekend or holiday, the deadline shifts to the next business day. Miss it, and your employer must withhold as if you’re single with no other adjustments until you file a new form.⁴

Turning It In and When It Takes Effect

Give the completed form to your employer’s payroll or HR department. Many employers now use electronic portals. An electronic system must replicate the paper form’s text and instructions, allow access to all worksheets, include the perjury statement, and require an electronic signature.⁵

When you replace a W-4 already on file, your employer must put the new one into effect no later than the start of the first payroll period ending on or after the 30th day after they receive it. Many act sooner.⁶ Check your next couple of pay stubs to confirm the change went through. If it didn’t, ask payroll.

When to Submit a New W-4

You can update your W-4 whenever you want. Some changes require it. If a life event means your current withholding will fall short of your actual tax bill, you must submit a new form within 10 days.⁷ That deadline applies to:

A filing status change, such as moving from married filing jointly to single, head of household, or married filing separately.
You or your spouse starting an additional job, especially if the original form used the Multiple Jobs Worksheet or the Step 2(c) box.
A child no longer qualifying for the Child Tax Credit you claimed.
Other tax credits dropping by more than $500, or deductions falling by more than $2,300 below what you entered.
Losing exempt eligibility because you now expect to owe income tax.

Other events — getting married, having a baby, buying a home, retiring — don’t carry the 10-day rule, but updating promptly keeps your withholding accurate.⁷

If You Are a Nonresident Alien

Different rules apply. Check the “Single or Married filing separately” box in Step 1(c) regardless of your actual marital status, and don’t use Step 2 to account for a spouse’s job. Because nonresident aliens generally can’t claim the standard deduction, your employer will withhold an additional amount to make up the difference. Write “nonresident alien” or “NRA” in the space below Step 4(c). Do not claim exemption from withholding. Use your Social Security number in Step 1(b), not an ITIN. Don’t rely on the IRS Tax Withholding Estimator; it isn’t built for nonresident aliens. IRS Notice 1392 and Publication 519 have the full guidance.⁸

If You Never Turn One In

Your employer doesn’t guess. Without a W-4 on file, they must withhold as if you’re single with no adjustments in Steps 2 through 4.⁹ For workers with dependents or a working spouse, that usually pulls out more tax than necessary. You’ll get the overpayment back as a refund, but not until you file.

The flip side matters too. If your total withholding plus estimated payments fall short, you may owe an underpayment penalty. The IRS generally charges it when you owe more than $1,000 at filing and you haven’t paid at least 90 percent of the current year’s tax or 100 percent of last year’s through withholding and credits.¹⁰ Getting the W-4 right the first time is what keeps you out of both extremes.

1
Internal Revenue Service. Form W-4 – Employee’s Withholding Certificate
2
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
3
Internal Revenue Service. Child Tax Credit
4
Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
5
Internal Revenue Service. Publication 15-T (2026), Federal Income Tax Withholding Methods
6
Electronic Code of Federal Regulations. Income Tax Withholding From Wages
7
Internal Revenue Service. Publication 505, Tax Withholding and Estimated Tax
8
Internal Revenue Service. Supplemental Form W-4 Instructions for Nonresident Aliens
9
Internal Revenue Service. Withholding Compliance Questions and Answers
10
Internal Revenue Service. Estimated Taxes