How to Fill Out a W-4 for Dummies: Step by Step With Examples

Form W-4 tells your employer how much federal income tax to hold back from each paycheck, and filling it out is a five-step process on a single page. To fill out a W-4, you enter your name and filing status, adjust for any second job or working spouse, claim dependents if you qualify, add any other income or extra withholding you want, and sign. Done well, the form leaves you close to even at tax time instead of owing a lump sum or waiting on a large refund.

What to Gather First

Pull these together before you open the form:

Your Social Security number and current address, exactly as they appear on your government records.
A rough estimate of your household’s total income for 2026.
Recent pay stubs for every job you and your spouse hold, if there’s more than one.
A blank 2026 Form W-4, which you can get from your employer’s HR department or download from the IRS site.¹

Step 1: Personal Information and Filing Status

Write your full legal name, address, and Social Security number. The IRS uses your SSN to match the tax your employer sends in with your account, so a typo here causes real problems later.

Then check one filing status box:²

Single or Married Filing Separately — you’re unmarried, or married but filing your own return.
Married Filing Jointly or Qualifying Surviving Spouse — you and your spouse plan to file one combined return.
Head of Household — you’re unmarried and pay more than half the cost of keeping up a home for yourself and a qualifying dependent.³

Your filing status sets the tax brackets and standard deduction your employer will use to run the calculation. For 2026, those standard deductions are $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.⁴ Pick the status you’ll actually use when you file. Getting it wrong throws your withholding off for the whole year.

Step 2: Multiple Jobs or Working Spouse

Skip this step if you have one job and are single, or you’re married and only one spouse works. Everyone else needs to make an adjustment here. Without one, each employer withholds as if that job is your only income, and the combined result is almost always too little.

You have three ways to handle it:

Option (a), IRS Tax Withholding Estimator. Go to the IRS tool at irs.gov/W4App. It looks at your household’s full picture and tells you what to put on each W-4. This is the most accurate route, especially when the two jobs pay very different amounts.⁵
Option (b), Multiple Jobs Worksheet. Use the worksheet on page 3 of the form to calculate an extra dollar amount, then write it on line 4(c) of the W-4 for your highest-paying job.
Option (c), the two-jobs checkbox. If you (and your spouse together) have exactly two jobs with roughly similar pay, check the box in Step 2(c) on both W-4s. Each employer then cuts the standard deduction and tax brackets in half when running the calculation. The further apart the two paychecks are, the less accurate this shortcut becomes.²

Worried about your employer seeing details about your spouse’s income or your second job? The 2(c) checkbox puts no dollar figures on the form, only a check mark. If that still feels like too much, the online estimator keeps the underlying math private and gives you a single number for line 4(c).

Step 3: Claiming Dependents

Step 3 lowers your withholding to reflect the child tax credit and the credit for other dependents. Fill it in only if your total household income will be $200,000 or less, or $400,000 or less if you’re married filing jointly.²

Line 3(a): multiply the number of qualifying children under age 17 by $2,200.
Line 3(b): multiply the number of other dependents (a dependent parent, a child 17 or older) by $500.

Add the two lines and enter the total on line 3. The child tax credit is $2,200 per qualifying child for 2026, up from $2,000; the $500 other-dependent credit is unchanged.² Over the income threshold, leave Step 3 blank. The credit phases out at higher incomes, and putting a number here anyway will cause underwithholding.

Be honest with the count. Padding this line to shrink your withholding carries a $500 civil penalty if you had no reasonable basis for the claim.⁶

Step 4: Other Adjustments (Optional)

Step 4 is optional. One job, standard deduction, no side income? Skip to Step 5. Otherwise, three lines let you fine-tune.

Line 4(a): Other Income

Enter income you expect in 2026 that won’t have tax withheld: interest, dividends, rental income, retirement distributions. Adding it here spreads the tax on that money across your paychecks so April doesn’t come with a bill. Don’t include wages from a job you already listed in Step 2.

Line 4(b): Deductions

Use this line if you plan to itemize (mortgage interest, charitable gifts, state and local taxes, and so on) instead of taking the standard deduction. The Deductions Worksheet on page 3 walks the math: total your expected itemized deductions, subtract the standard deduction for your filing status, and enter the difference. If your itemized total is less than the standard deduction, leave the line blank.

Line 4(c): Extra Withholding

Enter a flat dollar amount you want held from every paycheck on top of the normal calculation. People use this to cover tax on freelance income, catch up after a mid-year job change, or aim for a bigger refund. Any amount from the Multiple Jobs Worksheet in Step 2(b) also lands here.²

Step 5: Sign and Date

Sign and date the form. Your signature is a declaration under penalty of perjury that the information is true and complete.² An unsigned W-4 is invalid, and your employer can’t act on it.

Submitting the Form and Checking Your Pay Stub

Hand the completed W-4 to payroll or HR. Some employers take paper; others use an online portal. Federal rules require your employer to put the new form into effect no later than the start of the first payroll period ending on or after the 30th day after they receive it, and most process it within one or two pay cycles.⁷

When your next paycheck arrives, look at the “Federal Income Tax Withheld” line. If the number hasn’t changed at all, or looks wrong, call payroll. A short conversation now beats a surprise in April.

Claiming Exemption From Withholding

If you had zero federal income tax liability last year and expect the same for 2026, you can ask your employer to withhold nothing. Fill in Step 1 (name, address, SSN) and Step 5 (signature), then write “Exempt” in the space below Step 4(c). Leave Steps 2, 3, and 4 blank.²

Exemption expires. You have to file a new W-4 by February 16, 2027, or your employer will switch you to default withholding. If it turns out you did owe tax for 2026, you’ll be on the hook for the full amount plus any penalty when you file.

What Happens If You Don’t Submit a W-4

Start a new job without turning in a W-4 and your employer won’t guess. Federal rules make them withhold as if you’d checked “Single or Married filing separately” with no adjustments in Steps 2 through 4.⁸ Most people end up overwithheld under this default and get a refund, but their paychecks are smaller all year. If you’re married filing jointly, have dependents, or plan to itemize, you’re leaving real money in the government’s hands every pay period until you file the form.

When to Update Your W-4

You don’t need a new W-4 every year, but revisit it after any change that moves your tax picture. The IRS suggests employees look at their W-4 early each year after filing the prior return.⁹ Common triggers:

Getting married or divorced. Filing status and household income both shift.
Having or adopting a child. A new qualifying child adds up to $2,200 in Step 3.
Starting or leaving a second job, or a spouse starting or stopping work. Step 2 needs to match reality.
A large refund or an unexpected bill on last year’s return. Either one means your withholding was off.
A new rental property, a large investment gain, or freelance income. Adjust in Step 4(a) or 4(c).

There’s no cap on how often you can submit a new W-4. Your employer has to accept each one.

A Few Situations the W-4 Doesn’t Cover

The W-4 controls federal income tax only. Most states with an income tax use a separate form with a different name and layout; a few will accept the federal W-4 for state purposes, but many won’t. Ask your payroll department whether you also need a state form. Filing one without the other can leave your state withholding off even when your federal is right.

Nonresident aliens follow extra rules: check “Single or Married filing separately” in Step 1(c) regardless of actual marital status, don’t claim exemption, and write “NRA” below line 4(c).¹⁰ Nonresident aliens can’t use the IRS Tax Withholding Estimator. Full instructions are in IRS Notice 1392. If a tax treaty exempts your wages, you’ll file Form 8233 instead of a W-4.

1
Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate
2
IRS.gov. Form W-4 (2026) Employee’s Withholding Certificate
3
Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information
4
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
5
Internal Revenue Service. Tax Withholding Estimator
6
Office of the Law Revision Counsel. 26 USC 6682 – False Information With Respect to Withholding
7
Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
8
Internal Revenue Service. Publication 15-T (2026), Federal Income Tax Withholding Methods
9
Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
10
IRS.gov. Supplemental Form W-4 Instructions for Nonresident Aliens