How to Fill Out Form W-4: Steps, Exemptions, and Lock-In Letters

To fill out Form W-4, enter your name, address, Social Security number, and filing status in Step 1, then complete Steps 2, 3, and 4 only if they apply to your situation (multiple jobs, dependents, or other income and deductions), sign and date Step 5, and give the finished form to your employer’s payroll or HR office. The form tells your employer how much federal income tax to withhold from each paycheck. It never goes to the IRS.

Before You Start

Download the current form from irs.gov/pub/irs-pdf/fw4.pdf, or ask payroll for a copy. It’s four pages: page one is what you fill out and sign; pages two through four are worksheets and tables you use only if they apply.

Pull together your most recent tax return, Social Security numbers for yourself and any dependents, and a recent pay stub from every job in your household. If you’re married and both of you work, sit down with the form together. You’ll get a more accurate result.

Step 1: Personal Information and Filing Status

Enter your legal name, address, and Social Security number. Then check one filing status box:

Single or Married filing separately — unmarried, divorced, legally separated, or married and filing your own return.
Married filing jointly or Qualifying surviving spouse — filing jointly with your spouse, or widowed within the past two years with a dependent child.
Head of household — unmarried and paying more than half the cost of keeping up a home for yourself and a qualifying dependent.

Your filing status sets your standard deduction and tax bracket. For 2026, the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for head of household.¹ Choosing the wrong status is the most common reason withholding ends up too low or too high.

If none of Steps 2, 3, or 4 apply to you, skip straight to Step 5. Your withholding will be based on the standard deduction for the filing status you checked.

Step 2: Multiple Jobs or a Working Spouse

Complete this step only if you hold more than one job at the same time, or you’re married filing jointly and your spouse also works. The form gives you three ways to handle it, and they produce the same result:

Use the IRS Tax Withholding Estimator at irs.gov/W4app. It’s the most accurate option, walks you through your full household income, and generates a pre-filled W-4 you can print. The tool doesn’t ask for your name, Social Security number, or bank details, and nothing you enter is saved or sent to the IRS.²
Use the Multiple Jobs Worksheet on page three. Look up an extra withholding amount in the salary tables based on your two or three highest-paying jobs, then enter the result on Step 4(c).³
Check the box on line 2c. Use this only if there are exactly two jobs in your household and both pay roughly the same. Whoever checks it on one W-4 needs to check it on the other job’s W-4 too. It’s simple but can over-withhold if the two paychecks are uneven.

Whichever option you pick, the extra withholding goes on the W-4 for the highest-paying job only. On the other job’s W-4, leave Steps 2 through 4 blank.

Step 3: Claim Dependents

This step is available only if your total income will be $200,000 or less, or $400,000 or less if married filing jointly. Multiply your qualifying children under age 17 by $2,200 and enter that on line 3(a). Multiply any other dependents by $500 and enter that on line 3(b). Add the two and write the total on line 3.³

These amounts reduce your withholding to reflect the child tax credit and credit for other dependents you’ll claim on your return. Above the income thresholds, the credits phase out, and entering figures here would leave you under-withheld.

Step 4: Other Adjustments

Step 4 is optional. Use it to fine-tune withholding for anything the earlier steps miss.

Line 4(a), other income. Enter annual income you expect to receive without withholding — interest, dividends, retirement distributions, freelance work. This increases your withholding so you’re not caught short at tax time.
Line 4(b), deductions. If you plan to itemize instead of taking the standard deduction, use the Deductions Worksheet on page four to figure the difference and enter the result here. It reduces your withholding.³
Line 4(c), extra withholding. A flat dollar amount to withhold from every paycheck on top of the calculated amount. The Multiple Jobs Worksheet result goes here, and so does any cushion you want against owing.

If listing other income on line 4(a) feels too revealing (your employer sees the form), you can leave 4(a) blank and increase 4(c) by a comparable amount instead.

Step 5: Sign and Date

Sign and date the form. Without your signature it isn’t valid. The signature line carries a perjury statement — you’re certifying the information is true and complete to the best of your knowledge.³

When to Submit a New W-4

New hires complete a W-4 before their first paycheck so payroll can run correctly.⁴ After that, certain life changes call for an updated form.

Federal regulations require you to give your employer a revised W-4 within 10 days of any change that would reduce your withholding allowances for the current year.⁵ Divorce, losing a dependent, or a spouse taking a new job that raises household income all fit that category.

Changes that would increase your allowances (marriage, a new baby, an adoption) don’t carry a mandatory deadline. Filing promptly just means you see the benefit in your paychecks now rather than as a refund later.

Common reasons to submit a new form:

Marriage or divorce
Birth or adoption of a child
You or your spouse starting or leaving a job
A large increase in non-wage income
Buying a home, if it pushes you into itemizing
A child turning 17, which ends the $2,200 child tax credit for W-4 purposes

Claiming Exempt from Withholding

If you had zero federal income tax liability last year and expect the same this year, you can claim exempt. Fill in Steps 1(a), 1(b), and 5, skip Steps 2 through 4, and write “Exempt” in the space below line 4(c).³

Zero liability doesn’t just mean you got a refund. It means the total tax on line 24 of your Form 1040 was zero (or less than the sum of certain credits on lines 27a, 28, 29, and 30), or your income was below the filing threshold.

Exempt status expires. You have to file a new W-4 claiming it by February 15 each year. Miss that date and your employer begins withholding as if you’re single with no adjustments until you file a new form.⁶ If February 15 falls on a weekend or holiday, the deadline shifts to the next business day.

Where to Turn It In

Give the completed form to your employer’s payroll or human resources office. Do not mail it to the IRS. Your employer keeps it on file and uses it to calculate withholding; the IRS can request to review it, but you don’t send it there yourself.⁷

Many employers handle this through a payroll portal where you enter your elections directly. If you’re handing over paper, use a secure channel — the form has your Social Security number on it. Keep a copy for yourself so you can spot problems on your next pay stub.

Once your employer receives a new or revised W-4, they must put it into effect no later than the start of the first payroll period ending on or after the 30th day after receipt.⁶ Often the change shows up in the very next paycheck. If it doesn’t, call payroll.

If You Don’t File One

Skipping the form doesn’t mean no withholding. Your employer is required to withhold as if you’re a single filer with no other adjustments, which typically produces the highest withholding for a given income level.⁸ You’ll get the excess back as a refund, but not until you file your return.

Penalties for False Information

Inflating credits or claiming a filing status you don’t qualify for isn’t treated as a math error. There’s a $500 civil penalty for a withholding statement filed with no reasonable basis that results in less tax being withheld.⁹

Willfully filing false information, or deliberately failing to supply information that would increase withholding, is a criminal offense. The penalty is a fine of up to $1,000, up to one year in prison, or both, on top of any taxes and interest owed.¹⁰

IRS Lock-In Letters

If the IRS decides your W-4 doesn’t support the withholding you’ve claimed, it can send your employer a “lock-in letter” (Letter 2801-C) directing them to disregard any W-4 you file that would lower your withholding below a rate the IRS specifies.¹¹ Your employer must comply. You’ll receive a copy and a window to respond before the rate takes effect. To contest it, send a revised W-4 with documentation directly to the IRS, not to your employer.

Nonresident Aliens

Nonresident aliens working in the United States use the same Form W-4 but follow supplemental instructions in IRS Notice 1392.¹² Different rules apply, including limits on claiming “Married filing jointly” and different standard deduction treatment. Skipping the notice almost guarantees incorrect withholding.

State Withholding Is a Separate Form

The W-4 covers federal income tax only. Most states with an income tax require their own withholding form, usually handed to you alongside the federal W-4 at onboarding. A few states accept the federal form for state purposes; many use their own with different filing status choices or state-specific credits. States with no income tax don’t require a state form at all. Check with your employer or your state tax agency to confirm which one applies to you.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Tax Withholding Estimator
3
Internal Revenue Service. Form W-4 – Employee’s Withholding Certificate
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Internal Revenue Service. What People New to the Workforce Need to Know About Income Tax Withholding
5
eCFR. 26 CFR 31.3402(f)(2)-1 – Furnishing of Withholding Allowance Certificates
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Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
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Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate
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Internal Revenue Service. FAQs on the 2020 Form W-4
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Office of the Law Revision Counsel. 26 USC 6682 – False Information With Respect to Withholding
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Office of the Law Revision Counsel. 26 USC 7205 – Fraudulent Withholding Exemption Certificate or Failure to Supply Information
11
Internal Revenue Service. Understanding Your Letter 2801C
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Internal Revenue Service. About Notice 1392, Supplemental Form W-4 Instructions for Nonresident Aliens