Form W-4, Employee’s Withholding Certificate: Steps and Exemptions

Form W-4, the Employee’s Withholding Certificate, is the one-page IRS form you hand your employer so they know how much federal income tax to hold back from each paycheck. What you write on it decides whether you get a refund next April, owe a balance, or land close to even. The current version, redesigned after the Tax Cuts and Jobs Act, drops the old “allowances” system and asks for straightforward dollar amounts instead.

Who Fills Out a W-4

Every employee has to give their employer a signed W-4 before the first paycheck.¹ Skip it and the employer is required to withhold as though you are single or married filing separately with no other adjustments. That default usually produces the largest withholding and the smallest take-home pay, so the form is worth the few minutes it takes.

Independent contractors and the self-employed do not use Form W-4. With no employer withholding on their behalf, they pay income and self-employment tax through quarterly estimated payments on Form 1040-ES.²

What the W-4 Does Not Control

The form governs federal income tax withholding only. It has no effect on the Social Security tax (6.2% of wages up to the annual wage base) or Medicare tax (1.45% of all wages) that come out of every paycheck. Those rates are set by law.

Most states with an income tax also require their own withholding form. A few piggyback on the federal W-4, but most do not. Ask your employer’s payroll department how to handle state withholding separately.

Filling Out the Five Steps

The current W-4 is organized into five steps. Steps 1 and 5 are required for everyone. Steps 2 through 4 apply only if they fit your situation. You can download the form at IRS.gov or get a copy from HR.³

Step 1: Personal Information

Enter your legal name, address, Social Security number, and filing status. Filing status sets the standard deduction the withholding formula uses. For 2026, that deduction is $16,100 for single filers and married filing separately, $32,200 for married filing jointly, and $24,150 for heads of household.⁴ Picking the wrong status can throw off your withholding for the whole year.

Your name and Social Security number must match Social Security Administration records. If a marriage, divorce, or court order changed your name, update the SSA and get a new card before you submit the W-4. Mismatches cause problems when your employer files your W-2.⁵

Step 2: Multiple Jobs or a Working Spouse

Complete Step 2 only if you hold more than one job at a time, or if you’re married filing jointly and your spouse also works. Because tax brackets are progressive, income from two or more jobs stacks and pushes part of the total into higher brackets. If neither W-4 accounts for that, you’ll likely owe at tax time.

You have three ways to handle it.⁶ The IRS Tax Withholding Estimator at irs.gov/W4App gives the most accurate result and can generate a pre-filled W-4; it’s the best choice if you or your spouse also have self-employment income on top of a W-2 job.⁷ The Multiple Jobs Worksheet included with the form instructions is a paper alternative; complete it for the highest-paying job only and put the result in Step 4(c). If any job pays over $120,000 annually or you have more than three jobs total, the IRS points you to Publication 505 or the online estimator instead. The checkbox in Step 2(c) is the simplest method: when there are only two jobs with similar pay, each of you checks the box. It is the least precise of the three.

Step 3: Claiming Dependents

Step 3 reduces withholding to reflect the child tax credit and the credit for other dependents. For 2026, enter $2,200 for each qualifying child under 17 and $500 for each other qualifying dependent.⁶ The total lands on line 3, and the reduction gets spread across your paychecks for the year.

The child tax credit starts phasing out once adjusted gross income exceeds $200,000, or $400,000 for married filing jointly.⁸ Near or above those thresholds, entering the full credit here can leave you under-withheld. The Withholding Estimator can help you settle on a more accurate number.

Step 4: Other Adjustments

Step 4 has three optional lines that give you finer control. Line 4(a) is for other income you expect during the year that won’t have taxes withheld, such as interest, dividends, or retirement distributions; adding it here increases withholding to cover the extra tax. Line 4(b) is for deductions beyond the standard deduction, including itemized deductions or adjustments like student loan interest; entries here lower withholding. Line 4(c) is a flat extra dollar amount taken from every paycheck on top of the formula’s result, and it’s also where the Multiple Jobs Worksheet total goes.

If you have one job and plan to take the standard deduction, you can leave Step 4 blank.

Step 5: Sign and Date

Your signature is required. By signing you declare under penalty of perjury that the information is true and complete.⁶ An unsigned W-4 is invalid, and the employer will treat it as if you never submitted one.

Claiming Exempt from Withholding

You can claim a full exemption from federal income tax withholding only when two things are both true: you owed zero federal income tax last year, and you expect to owe zero this year.⁶ To claim it, write “Exempt” in the space below Step 4(c), complete Steps 1 and 5, and leave the rest blank.

Exempt status expires every February 15. Miss that deadline without filing a new exempt W-4 and your employer must start withholding as single or married filing separately with no adjustments.⁹ Filing a new exempt W-4 later works going forward but does not trigger a refund of anything already withheld.

Claiming exempt when you don’t qualify is a fast way to draw IRS attention, and it also means no tax comes out of any paycheck all year, which sets up a large bill in April.

Submitting the Form and When It Takes Effect

Give the completed W-4 directly to payroll or HR. You do not send it to the IRS. The employer keeps it on file. Many companies now collect the same information through a secure online portal with immediate confirmation.

By law, the employer must begin using your new instructions no later than the first payroll period ending on or after the 30th day after receiving the form.¹⁰ Many process it faster, but the statute gives up to 30 days. Check the federal income tax line on your pay stub for the next couple of pay periods, and keep a personal copy of every W-4 you submit.

When to Update Your W-4

You don’t have to file a new W-4 every year, but you should revisit it whenever your tax picture changes. Common triggers:

Getting married or divorced
Having or adopting a child
Starting or leaving a second job
A spouse starting or stopping work
A significant change in non-wage income like investments or rental property
Buying a home and planning to itemize mortgage interest

If a life change decreases your withholding allowance mid-year, federal law requires you to submit an updated W-4 within 10 days.¹ If the change would lower your taxes (a new dependent, for example), updating is optional but in your favor.

A useful yearly check: run the IRS Tax Withholding Estimator with a recent pay stub and last year’s return in hand. It takes about 15 minutes and tells you whether you’re on track or heading for a surprise.⁷

Nonresident Aliens

If you’re a nonresident alien working in the United States, IRS Notice 1392 changes several rules:¹¹

Check “Single or Married filing separately” in Step 1(c) regardless of your actual marital status.
Enter a Social Security number. An ITIN is not accepted on the W-4.
Write “nonresident alien” or “NRA” in the space below Step 4(c) on at least one W-4.
You cannot claim exemption from withholding.
Do not use the IRS Tax Withholding Estimator, which is built for U.S. residents.
Only nonresident aliens from Canada, Mexico, South Korea, or India may be eligible to claim dependent credits in Step 3.

Do not account for a spouse’s job in Step 2 unless you personally hold more than one job. Nonresident aliens generally cannot file jointly, so a spouse’s income is irrelevant to the calculation.

Penalties and IRS Enforcement

Submit a W-4 with “no reasonable basis” that produces less withholding than the law requires and the IRS can add a $500 civil penalty on top of the taxes owed.⁹ Honest mistakes in the gray areas of the form don’t trigger it; the target is inflated dependent credits or exempt status claimed by someone who clearly owes tax.

Even without a fraudulent W-4, under-withholding can lead to an underpayment penalty when you file. You generally avoid that penalty if you owe less than $1,000 at filing, or if your withholding plus estimated payments covered at least 90% of this year’s tax or 100% of last year’s, whichever is less.¹² The prior-year safe harbor rises to 110% if your adjusted gross income last year exceeded $150,000 ($75,000 married filing separately). The IRS charges interest on underpayments at a rate that adjusts quarterly, 7% as of early 2026.¹³

When the IRS decides an employee’s withholding is far too low, it can send a “lock-in” letter to the employer setting a minimum withholding level. Once it takes effect, the employer must ignore any new W-4 that would drop withholding below that floor.¹⁴ You can still submit a W-4 that raises withholding above the lock-in amount, but you cannot lower it without IRS approval. Employers who ignore a lock-in letter become personally liable for the tax that should have been withheld. Getting out from under one means contacting the IRS directly and showing that your current W-4 entries are accurate; a new form on its own will not do it.

1
Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source
2
Internal Revenue Service. Self-Employed Individuals Tax Center
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Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate
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Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
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Internal Revenue Service. Name Changes and Social Security Number Matching Issues
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Internal Revenue Service. Form W-4, Employee’s Withholding Certificate
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Internal Revenue Service. Tax Withholding Estimator
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Internal Revenue Service. Child Tax Credit
9
Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
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Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source
11
Internal Revenue Service. Notice 1392, Supplemental Form W-4 Instructions for Nonresident Aliens
12
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
13
Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
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Internal Revenue Service. Withholding Compliance Questions and Answers