How to Fill Out the Employee Withholding Allowance Certificate

To fill out a W-4, work through the five numbered steps on the current IRS form: enter your name, address, Social Security number, and filing status in Step 1; use Step 2 if you hold more than one job or your spouse also works; claim dependents in Step 3; add any optional adjustments in Step 4; then sign in Step 5 and hand the form to your employer’s payroll or HR department.¹ Federal law requires you to give your employer a signed withholding certificate when you start a job.² Getting it right keeps you from either owing a surprise balance in April or handing the government an interest-free loan through overwithholding.

Step 1: Your Information and Filing Status

Step 1 asks for your full legal name, home address, and Social Security number, then your filing status. Providing false information to reduce your withholding without a reasonable basis carries a $500 civil penalty.³

The three filing status choices are:

Single or Married Filing Separately, if you’re unmarried or married but filing your own return.
Married Filing Jointly or Qualifying Surviving Spouse, if you and your spouse file jointly, or if your spouse died within the last two years and you maintain a home for a dependent child.⁴
Head of Household, if you’re unmarried and pay more than half the cost of keeping up a home for a qualifying dependent.⁵

Your filing status controls both the standard deduction your employer subtracts and the tax bracket table it uses. For 2026, the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.⁶ Choose carefully. The wrong status throws off every calculation downstream.

Step 2: Multiple Jobs or a Working Spouse

Skip Step 2 when you have one job and a non-working spouse (or no spouse). Complete it when you hold more than one job at the same time, or when you’re married filing jointly and your spouse also works. Combined household income can push you into a higher bracket than either job alone would suggest, and leaving this step blank is the most common way people end up underwithheld.⁷

You have three options, listed on the form from most precise to simplest:

The IRS Tax Withholding Estimator at irs.gov/individuals/tax-withholding-estimator. It asks about your income, deductions, and credits, then tells you what to enter. Have recent pay stubs and your last tax return handy.⁸
The Multiple Jobs Worksheet in the W-4 instructions, a paper calculation using salary-range tables. Less precise than the estimator but perfectly workable.
The Step 2(c) checkbox. Only use this when there are exactly two jobs in the household and both pay roughly the same. You must check the box on the W-4 for both jobs, or the math won’t balance.⁷

Three or more jobs, or a large pay gap between two jobs, means the checkbox will underperform. Use the estimator or the worksheet instead.

Step 3: Dependents and Credits

Step 3 lets you reduce your withholding for tax credits you expect to claim. You’re eligible if your total income is $200,000 or less, or $400,000 or less if you file jointly.⁹

Multiply the number of qualifying children under age 17 by $2,200. Multiply any other dependents by $500.¹ Other dependents include older children, dependent parents, and other qualifying relatives who don’t meet the child tax credit age rule.¹⁰ Add the two figures and enter the total. Your employer spreads that credit across the year’s paychecks, reducing each one’s withholding by a proportional amount.

Step 4: Optional Adjustments

Every line in Step 4 is optional. Most workers with a single job and the standard deduction can leave the whole section blank.

Line 4(a) is for other income that has no withholding of its own: interest, dividends, retirement distributions, rental income. Enter the annual total and your employer withholds extra from each paycheck to cover it, which saves you from making quarterly estimated payments.¹

Line 4(b) is for deductions. If you plan to itemize or claim adjustments to income that exceed your standard deduction, a worksheet in the W-4 instructions helps you calculate the difference. This line only helps if your itemized deductions actually top the standard deduction for your filing status.⁶

Line 4(c) is for extra withholding, a flat dollar amount you want taken from every paycheck on top of the calculated figure. People use it when the formula still won’t capture their full liability, when they have significant side income, or simply when they prefer a bigger refund. It’s also the standard fix if the IRS Tax Withholding Estimator says you’re running behind for the year.¹

Step 5: Sign and Submit

Sign and date the form under penalties of perjury. Hand it to your employer, not to the IRS. Most workplaces accept it through a payroll portal or HR system, and a paper copy delivered to payroll works too. Your employer must put the new withholding into effect no later than the start of the first payroll period ending on or after the 30th day after they receive it, though many process it faster and the change often shows up on your next paycheck.¹¹

Claiming Exemption from Withholding

Some workers owe zero federal income tax and can tell their employer not to withhold any. To qualify, you must have had no federal tax liability last year and expect none this year. Complete Steps 1(a) and 1(b), skip Steps 2 through 4, write “Exempt” in the space provided above Step 5, then sign and date.¹

Exempt status expires every year on February 15. If you don’t submit a new W-4 claiming exemption by that date, your employer must switch to withholding at the default single rate with no adjustments. Any tax withheld during the gap won’t be refunded by your employer; you recover it only when you file your annual return.¹¹

When to Update Your W-4

There’s no yearly requirement to resubmit unless you claimed exempt. Your form stays in effect until you replace it. Still, the IRS recommends reviewing your withholding each year and after any change in your finances.¹²

Some updates aren’t optional. If a life change reduces the withholding you’re entitled to claim (you lose a dependent, get divorced, or your spouse stops working), you must submit a new W-4 within 10 days.¹³ Specific triggers include your credits dropping by more than $500 or your deductions dropping by more than $2,300 from the amounts on your current W-4. Changes that increase your withholding entitlement, such as a new baby or a marriage, don’t carry a deadline, but updating promptly stops the overwithholding sooner.

What Happens if You Don’t Submit One

Skipping the form doesn’t mean your employer guesses. Federal rules require them to withhold as if you had checked “Single or Married Filing Separately” and left Steps 2 through 4 blank.¹⁴ That’s typically the highest withholding rate for your income level, since you get no credit for dependents, no deduction adjustments, and no recognition of a spouse’s income. Most people in this situation overwithhold for the year and wait for a refund.

Avoiding an Underpayment Penalty

Underwithholding can cost more than just the tax bill. If you owe more than $1,000 when you file, the IRS may assess a penalty on top of the balance.¹⁵

You avoid the penalty if your withholding plus any estimated payments meets either of two thresholds:

90% of your current-year tax liability, or
100% of your prior-year tax liability, whichever is less.

Higher earners face a stricter version. If your adjusted gross income last year exceeded $150,000 (or $75,000 if married filing separately), the prior-year threshold rises to 110%.¹⁵ That rule catches people whose income jumped: they withheld enough to cover last year’s bill but not 110% of it. Running the IRS Tax Withholding Estimator mid-year is the easiest way to check.

State Withholding Is Separate

Form W-4 covers federal income tax only. Most states with an income tax require their own withholding form, though a few piggyback on the federal W-4. Eight states levy no individual income tax at all. Your employer’s HR or payroll department can tell you which state form applies to you and whether you need to complete it alongside the federal one.

1
Internal Revenue Service. Form W-4 (2026) Employee’s Withholding Certificate
2
Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source
3
Office of the Law Revision Counsel. 26 USC 6682 – False Information With Respect to Withholding
4
Internal Revenue Service. Qualifying Surviving Spouse Filing Status
5
Internal Revenue Service. Filing Status
6
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
7
Internal Revenue Service. FAQs on the 2020 Form W-4
8
Internal Revenue Service. Tax Withholding Estimator
9
Internal Revenue Service. Child Tax Credit
10
Internal Revenue Service. Understanding the Credit for Other Dependents
11
Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
12
Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate
13
Internal Revenue Service. Publication 505 (2025), Tax Withholding and Estimated Tax
14
Internal Revenue Service. 2026 Publication 15-T Federal Income Tax Withholding Methods
15
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty