How to Fill Out Form W-4: Steps, Exemptions, and Timing

To fill out Form W-4 for 2026, complete Step 1 with your name, address, Social Security number, and filing status, sign Step 5, and add Steps 2 through 4 only if they apply to your situation. The form has five steps total, but most people with one job and a straightforward tax picture only need Steps 1 and 5. The more moving parts in your finances, whether that means a second job, a working spouse, dependents, or income outside your paycheck, the more of the middle steps you’ll need to complete.

Step 1: Personal Information and Filing Status

At the top of the form, enter your full legal name, Social Security number, and home address. The name has to match Social Security Administration records. If it doesn’t, call the SSA at 800-772-1213 and fix the mismatch before submitting the W-4, because inconsistencies can foul up your tax records later.

Then pick a filing status. Your three options on the form are:

Single or Married Filing Separately: unmarried, legally separated, or married but planning to file your own return.
Married Filing Jointly: you and your spouse will file one combined return. This status generally produces the lowest withholding per dollar earned.
Head of Household: unmarried and paying more than half the cost of keeping up a home for a qualifying dependent, such as a child or parent.

The filing status choice is the fastest way to throw off your withholding for the whole year. If head of household is in question, the test is whether you cover more than half the household’s expenses and a qualifying person lives with you for more than half the year.

Step 2: Multiple Jobs or a Working Spouse

Step 2 exists because each employer withholds as if its paycheck is your only income. If you hold two jobs, or you’re married filing jointly and your spouse also works, that assumption breaks down and too little tax comes out overall. The shortfall shows up as a balance due when you file.

You have three ways to correct for it:

The IRS Tax Withholding Estimator at irs.gov/W4App gives the most accurate result because it uses your actual pay stubs, deductions, and credits, then tells you exactly what to enter on each W-4.¹
The Multiple Jobs Worksheet on page 3 calculates an extra dollar amount to withhold each pay period. Put the result on Step 4(c) of the W-4 for your highest-paying job only.²
The Step 2(c) checkbox is the simplest option. If there are only two jobs in the household and they pay roughly the same, both W-4s check the box. Accuracy drops when the two paychecks are very different.

A Privacy-Friendly Alternative

You may not want payroll to know about a spouse’s income or a second job. The form’s instructions explicitly offer Step 4(c) as a workaround: instead of filling in Step 2 or listing outside income in Step 4(a), put a flat extra-withholding amount in Step 4(c).² Your employer sees a number, not the reason for it.

Step 3: Dependent Credits

Step 3 lowers your withholding to reflect credits you’ll claim at tax time. Use it only if your total income is $200,000 or less, or $400,000 or less for married filing jointly.²

Multiply the number of qualifying children under 17 by $2,200 and put the result on line 3(a).²
Multiply the number of other dependents (older children, elderly parents, other qualifying relatives) by $500 and put the result on line 3(b).²

Add 3(a) and 3(b) and enter the total on line 3. That amount reduces the tax pulled from each paycheck. Above the income thresholds the credit phases out by $50 for every $1,000 over, so claiming the full amount on the W-4 would leave you under-withheld.

Step 4: Other Adjustments

Three optional lines let you fine-tune what Steps 1 through 3 don’t cover.

Line 4(a): Other Income

If you expect meaningful income that arrives without withholding, enter the annual total here. This covers things like interest, dividends, rental income, and retirement distributions without withholding. Your employer spreads extra tax across your paychecks to cover it. If you’d rather keep this off payroll’s desk, skip 4(a) and use 4(c) instead.

Line 4(b): Deductions

Use line 4(b) only if you’ll itemize and your itemized total will exceed the standard deduction. The Deductions Worksheet on page 4 walks through the math. The 2026 standard deduction amounts already built into the withholding tables are:

Married filing jointly or qualifying surviving spouse: $32,200
Head of household: $24,150
Single or married filing separately: $16,100

If your itemized deductions exceed those figures, put the difference on line 4(b) to reduce withholding.³ If they don’t, leave the line blank; the tables already assume you’ll take the standard deduction.

Line 4(c): Extra Withholding

Enter any additional dollar amount you want taken out each pay period. Some people use this to build toward a refund, others use it as the privacy substitute for Steps 2 and 4(a). There’s no cap on the amount.

Part-Year Employment

If you started work partway through the year, standard withholding tables assume the same paycheck for all 12 months and often take out too much. The form’s instructions recommend using the IRS Tax Withholding Estimator to adjust rather than working the paper worksheets.²

Step 5: Sign and Date

The form is invalid without your signature. Sign, date, and hand it to payroll or submit it through your employer’s HR portal. Your employer keeps the form on file for at least four years and does not send it to the IRS unless specifically asked.⁴

Claiming Exemption From Withholding

You can claim exemption from federal income tax withholding only if you had zero federal income tax liability last year and expect zero this year.⁵ Getting a refund is not the same thing. If tax was calculated on your return and withholding covered it, you had liability and don’t qualify. This exemption usually fits students or part-time workers whose annual pay falls under the standard deduction.

To claim it on the 2026 form, check the box in the “Exempt from withholding” section and complete only Steps 1(a), 1(b), and 5. Leave every other step blank.² Social Security and Medicare taxes still come out; the exemption only covers federal income tax.

Every exemption expires on February 15. If you don’t file a new W-4 claiming exemption by then, your employer must start withholding at the default rate.⁵ Claiming exemption when you don’t qualify carries a $500 penalty per false statement.⁶

If You’re a Nonresident Alien

Standard W-4 instructions don’t apply the same way to nonresident aliens. IRS Notice 1392 sets special rules: check Single or Married Filing Separately in Step 1(c) regardless of actual marital status, skip any spouse’s job in Step 2, write “Nonresident Alien” or “NRA” below Step 4(c), do not claim exemption from withholding, and provide a Social Security number (an ITIN is not accepted on the W-4).⁷

What Happens If You Don’t Turn One In

If you start a job and never submit a W-4, federal rules require your employer to withhold as though you checked Single or Married Filing Separately with no entries in Steps 2 through 4.⁸ For a single person with one job, that default may be close enough. For a married person with dependents, it usually means far too much comes out of every paycheck, and you won’t recover the difference until you file.

When Your W-4 Takes Effect

Your first W-4 with an employer takes effect at the start of the first payroll period ending on or after the day you turn it in, so it usually hits the next paycheck. A replacement W-4 can legally take up to 30 days to apply, though most payroll systems act sooner.⁹ Check the federal income tax line on your next pay stub to confirm the change went through.

When to Submit a New W-4

A W-4 doesn’t expire on its own outside the exemption claim, but life changes can quietly make it wrong. If a change reduces the withholding you’re entitled to claim, you’re legally required to submit a new form within 10 days.¹⁰ Situations that trigger the 10-day rule include:

Filing status downgrade, such as moving from married filing jointly to single, or head of household to single, after a divorce or legal separation.
A new second job for you or your spouse.
Losing a dependent credit, whether a child ages out of the child tax credit or a dependent no longer qualifies.
Deductions dropping by more than $2,300 from what you entered on a previous W-4.

Even outside the 10-day rule, it’s worth reviewing your W-4 after getting married, having a child, buying a home, or ending up with an unexpectedly large refund or balance due. The IRS Tax Withholding Estimator is the fastest way to check whether you’re on track for the year.¹

1
Internal Revenue Service. Tax Withholding Estimator
2
IRS.gov. Form W-4 (2026)
3
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
4
Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
5
eCFR. 26 CFR 31.3402(n)-1 – Employees Incurring No Income Tax Liability
6
Office of the Law Revision Counsel. 26 USC 6682 – False Information With Respect to Withholding
7
IRS. Supplemental Form W-4 Instructions for Nonresident Aliens (Notice 1392)
8
Internal Revenue Service. Publication 15-T (2026), Federal Income Tax Withholding Methods
9
Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source
10
Internal Revenue Service. Publication 505, Tax Withholding and Estimated Tax