Form W-4 tells your employer how much federal income tax to withhold from each paycheck. The form has five steps, but most people only need to complete two of them: Step 1 (personal information) and Step 5 (your signature). Steps 2 through 4 are optional and only apply if you have multiple jobs, dependents, or other specific situations.
Step 1: Personal Information
This is one of two required sections. Fill in your full legal name, home address, and Social Security number. Then check the box for your filing status: Single or Married Filing Separately, Married Filing Jointly (or Qualifying Surviving Spouse), or Head of Household.
Your filing status matters more than it might seem. It determines the tax brackets and standard deduction your employer uses to calculate withholding. If you’re married but check “Married Filing Separately,” your employer will withhold at a higher rate than if you check “Married Filing Jointly.” Choose the status you actually plan to use when you file your tax return.
Step 2: Multiple Jobs or a Working Spouse
Skip this step entirely if you have one job and either file as single or are married with a nonworking spouse. Complete it if you hold more than one job at the same time, or if you’re married filing jointly and your spouse also works. Without this adjustment, each employer withholds as though its paycheck is your only income, which usually means too little tax is taken out overall.
You have three options for handling this step:
- Option A: IRS Tax Withholding Estimator. The online tool at irs.gov/W4app gives you the most accurate result. You’ll enter approximate pay for each job, and the tool will tell you an extra dollar amount to put in Step 4(c) on the W-4 for just one of your jobs. This option also keeps your information private from your employer since the form won’t reveal that you have other income sources.
- Option B: Multiple Jobs Worksheet. Page 3 of the W-4 includes a worksheet you can fill out by hand. Like Option A, it produces an extra withholding amount you enter in Step 4(c) on the W-4 for only one job. The other job’s W-4 stays simple.
- Option C: Check the box. If you (and your spouse) have exactly two jobs total, you can check the box in Step 2(c) on both W-4s. This tells each employer to split the standard deduction and tax brackets in half when calculating withholding. It’s the simplest method, but it can over-withhold slightly if the two jobs pay very different amounts.
If you use Option A or B, only enter the extra withholding amount on the W-4 for one job. The W-4 for your other job (or your spouse’s job) should leave Steps 2 through 4 blank.
Step 3: Claiming Dependents
This step reduces your withholding to account for the child tax credit and the credit for other dependents. It only applies if your total household income is $200,000 or less ($400,000 or less if married filing jointly).
Multiply the number of qualifying children under age 17 by $2,200 and enter that amount on line 3(a). For other dependents, such as older children, elderly parents you support, or other qualifying relatives, multiply the number by $500 and enter that on line 3(b). Add the two amounts together and write the total on line 3. Your employer will reduce your withholding by spreading that credit across your remaining paychecks for the year.
If your income exceeds those thresholds, leave Step 3 blank. The credit phases out above $200,000 ($400,000 joint), and claiming it here when you don’t qualify means you’ll owe money when you file your return.
Step 4: Other Adjustments
Step 4 has three optional lines that fine-tune your withholding. You can use any combination of them or skip the entire step.
Line 4(a): Other income. If you expect significant non-job income this year, such as interest, dividends, or retirement distributions, enter the annual total here. Your employer will factor this amount into your withholding so you don’t end up short at tax time. Don’t include income from self-employment or side gigs where you’re already making estimated tax payments.
Line 4(b): Deductions. If you plan to itemize deductions (mortgage interest, charitable contributions, state and local taxes) and your itemized total will exceed the standard deduction, you can enter the difference here. A deductions worksheet on page 3 of the form walks you through the math. The result lowers your withholding because you’re telling your employer your taxable income will be smaller than the standard deduction assumes. If you plan to take the standard deduction, leave this line blank.
Line 4(c): Extra withholding. Enter a flat dollar amount you want withheld from each paycheck on top of what the form otherwise calculates. This is useful if you’ve owed taxes in previous years and want a bigger cushion, or if you have income sources (like freelance work) that aren’t subject to withholding and you’d rather handle it through your paycheck than make quarterly estimated payments. It’s also where you’d enter the amount calculated in Step 2 if you used the online estimator or the Multiple Jobs Worksheet.
Step 5: Sign and Date
Sign and date the form. An unsigned W-4 is not valid, and your employer can’t use it. Hand the completed form to your employer’s HR or payroll department. You do not file it with the IRS yourself.
When to Submit a New W-4
You’ll fill out a W-4 when you start a new job, but you can also submit an updated form to your current employer at any time. Common reasons to update include getting married or divorced, having a child, starting a second job, or owing a large balance (or getting a large refund) when you file your tax return. Your employer is required to put the new withholding into effect by the start of the first payroll period ending 30 or more days after you submit the form.
If your situation is straightforward, a single job with no dependents and no major outside income, filling out the W-4 takes about two minutes. Complete Step 1, skip to Step 5, sign it, and you’re done. The default withholding based on your filing status and the standard deduction will handle the rest.
Claiming Exempt Status
If you had no federal income tax liability last year and expect none this year, you can write “Exempt” on the form below Step 4(c) instead of completing Steps 2 through 4. This tells your employer to withhold zero federal income tax from your paychecks. Social Security and Medicare taxes will still be withheld regardless. An exemption claim expires on February 15 of the following year, so you need to submit a new W-4 each year if you still qualify. If you claim exempt but end up owing tax, you could face an underpayment penalty when you file.