How to Fill Out a Tax Withholding Form (W-4)

To fill out a W-4, complete Step 1 with your name, address, Social Security number, and filing status, then sign and date Step 5. Most people can skip everything in between. You only need Steps 2, 3, and 4 if your household has more than one job, if you plan to claim dependents, or if you want to account for other income, itemized deductions, or extra withholding. The 2026 form adds lines for qualified overtime pay and vehicle loan interest under the One Big Beautiful Bill Act, so a W-4 you filed even a year ago may be working from outdated numbers.¹

What to Have in Front of You

For a straightforward return, you need your Social Security number and your expected filing status: single, married filing jointly, married filing separately, or head of household. If you have one job, no dependents, and plan to take the standard deduction, that’s the whole list.

If your situation is busier, pull recent pay stubs from every job in the household and last year’s tax return so you can estimate combined income. Have Social Security numbers and birth dates for any dependents. If you expect to itemize, get rough figures for mortgage interest, state and local taxes paid, and charitable contributions.

You can download the form from irs.gov, ask HR for a paper copy, or complete it through your employer’s payroll portal. Many workplaces run the whole process digitally now.

Step 1: Personal Information and Filing Status

Step 1 collects your name, address, Social Security number, and filing status. The filing status you check controls which standard deduction and tax brackets your employer uses to calculate withholding, so getting it right is the single most important decision on the form.¹

Head of household is the status people most often get wrong. You qualify only if you are unmarried and pay more than half the cost of maintaining a home for yourself and a qualifying dependent. Married-but-separated filers may qualify under certain tests. When in doubt, check single or married filing separately and adjust once you’re sure.

Step 2: Multiple Jobs or a Working Spouse

Skip Step 2 if you have one job and your spouse doesn’t work, or if you’re single with one job. Everyone else needs to address it. The default withholding tables assume your job is your household’s only source of wage income, so two-earner households almost always underwithhold without an adjustment here.

The form offers three ways to handle it. Option (a) sends you to the IRS Tax Withholding Estimator at irs.gov/W4App, an online tool that walks through your full financial picture and produces exact dollar amounts to enter on the form. This is the most accurate route, especially if you also have self-employment income.²

Option (b) is the Multiple Jobs Worksheet on page 3. You look up the salary ranges of your highest-paying and lowest-paying jobs in a table, and enter the result on line 4(c) as additional withholding.

Option (c) applies only when there are exactly two jobs in the household paying roughly similar amounts. Check the box in Step 2(c) on both W-4s. Each employer will split the standard deduction and tax brackets in half for its job.¹

One privacy point: Option (c) doesn’t require you to disclose the other job’s pay to either employer. Options (a) and (b) involve dollar amounts calculated from combined income, which anyone looking closely at your payroll file could work backward from. If that matters to you, Option (c) or the online estimator are cleaner.

Step 3: Dependents and Credits

Step 3 lowers your withholding to account for tax credits you expect to claim at filing. For 2026, multiply the number of qualifying children under age 17 by $2,200 and the number of other dependents by $500. Add them and enter the total.³ A qualifying child generally must live with you more than half the year and have a valid Social Security number.

The $2,200 figure went up from $2,000 under the One Big Beautiful Bill Act. If your form still shows $2,000, you’re working from an outdated revision.

If your household has multiple jobs, complete Step 3 on only one W-4. Claiming the same credits on two forms will reduce withholding too much, and you’ll owe at filing time.

Step 4: Other Income, Deductions, and Extra Withholding

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

Line 4(a): Other Income

Enter income you expect this year that won’t have taxes withheld automatically, such as interest, dividends, or retirement distributions. Adding it here spreads the tax across your paychecks instead of leaving a bill in April.

Line 4(b): Deductions

If your itemized deductions will exceed the standard deduction for your filing status, use the Deductions Worksheet on page 3 to calculate the difference and enter it here. For 2026, the standard deduction is $16,100 for single filers, $32,200 for married filing jointly, and $24,150 for head of household.⁴

The 2026 Deductions Worksheet also includes new lines for qualified overtime compensation and qualified passenger vehicle loan interest. The overtime line covers the premium portion of time-and-a-half pay, up to $12,500 ($25,000 if married filing jointly), for employees below certain income thresholds. The vehicle loan interest line allows a deduction of up to $10,000 for employees with total income under $100,000 ($200,000 if married filing jointly). Both come from the One Big Beautiful Bill Act and did not appear on earlier versions of the form.

Line 4(c): Extra Withholding

Enter a flat dollar amount you want withheld from each paycheck on top of everything else. If you owed taxes last year and want a cushion, adding $25 or $50 a pay period here is the simplest fix. The result from the Multiple Jobs Worksheet in Step 2(b) also lands on this line.

Step 5: Sign and Submit

Sign and date the form. Your signature certifies the information is accurate under penalty of perjury. Deliberately providing false information on a W-4 is a federal offense punishable by a fine of up to $1,000, up to one year in prison, or both.⁵

Return the form through whatever channel your employer uses: an HR portal, an email to payroll, or a paper copy. Federal rules require your employer to put the new W-4 into effect no later than the start of the first payroll period ending on or after the 30th day from the date they receive it.⁶ Check the next couple of pay stubs to confirm federal withholding actually changed.

If you never turn in a W-4 at all, your employer must withhold as though you are a single filer with no adjustments, which usually produces the highest withholding for your income level.⁷

Claiming Exempt From Withholding

If you had zero federal income tax liability last year and expect none this year, you can claim exemption. Write “Exempt” in the space below line 4(c) and complete only Steps 1 and 5.⁸ Your employer will withhold nothing for federal income tax, though Social Security and Medicare still come out.

Exempt status expires every year. You must file a new W-4 claiming exempt by February 15 of the following year, or your employer will start withholding again as if you were a single filer with no adjustments.⁶ If February 15 lands on a weekend or holiday, the deadline moves to the next business day.

When to Redo Your W-4

You aren’t locked in for the year. You can submit a new W-4 to your employer any time, and most people should revisit it whenever their finances shift. Common triggers: getting married or divorced, having a child, buying a home, starting a second job, or a spouse leaving a job.⁹

A useful habit is running the IRS Tax Withholding Estimator once a year, ideally after your first full paycheck of the year or right after a life event. It compares projected withholding against projected liability and tells you exactly what to change. The 2026 version has been updated for the One Big Beautiful Bill provisions, so workers who filed a new W-4 recently may still find their withholding is off.

State Withholding Is a Separate Form

Form W-4 controls federal income tax only. If you work in a state with an income tax, you’ll usually complete a separate state withholding certificate. A handful of states accept the federal W-4 in place of their own, and nine states with no income tax require nothing. Your employer’s HR department should hand you the correct state form alongside the federal W-4 when you start a new job.

1
Internal Revenue Service. Form W-4 (2026) Employee’s Withholding Certificate
2
Internal Revenue Service. Tax Withholding Estimator
3
Internal Revenue Service. Child Tax Credit
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Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
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Office of the Law Revision Counsel. 26 USC 7205 – Fraudulent Withholding Exemption Certificate or Failure to Supply Information
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Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
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Internal Revenue Service. FAQs on the 2020 Form W-4
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Internal Revenue Service. Publication 15-T (2026), Federal Income Tax Withholding Methods
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Internal Revenue Service. Updated Tax Withholding Estimator Lets Millions of Taxpayers Take One, Big, Beautiful Bill Changes Into Account When Calculating Their Withholding