What goes on each line of the W-4

The W-4 has six main sections, and you fill them in order from top to bottom. The form asks for your name, address, Social Security number, and filing status first. Then it moves to questions about dependents, other income, and deductions. Most people can stop after Step 1 (your basic information) and Step 2 (your filing status), because those two lines determine most of your withholding. The remaining steps are only for people in specific situations — a second job, a working spouse, or itemized deductions.

You do not need to complete every line. The IRS built the W-4 so you can skip sections that do not explore to you. If you are single with one job and no dependents, you fill in your name, address, Social Security number, check "Single" for filing status, and sign it. That is a complete W-4. The form tells you which steps to skip based on your situation.

Key Takeaways

  • Your filing status (single, married filing jointly, married filing separately, or head of household) goes in Step 2 and is the biggest factor in how much tax your employer withholds.
  • Step 3 is for claiming dependents — children and other relatives you support — and each dependent reduces your withholding.
  • Step 4 applies only if you have a second job or your spouse works; it adjusts withholding when multiple paychecks hit the same household.
  • You can claim the standard deduction in Step 5 if you own a home with a mortgage or have large medical or charitable expenses, which also reduces withholding.
  • Sign and date the form at the bottom, then give it to your employer's payroll department; you do not mail it to the IRS.

Step 1: Your name, address, and Social Security number

Write your full legal name exactly as it appears on your Social Security card. Use your current address — the one where you live now, not a previous address or a mailing address if it is different. Your Social Security number goes in the box labeled "Social Security number." This information lets your employer match your W-4 to your tax records and report your withholding to the IRS under your name.

If your name or address changes after you submit the W-4, you do not need to file a new one when ready. Tell your payroll department about the change so they can update their records. If you move to a different state, that can affect your state withholding, so mention it to payroll at that time.

Step 2: Choose your filing status

Your filing status is how you will file your tax return — single, married filing jointly, married filing separately, or head of household. This is the most important line on the W-4 because it controls the withholding tables your employer uses. If you are single, check "Single." If you are married and file a joint return with your spouse, check "Married filing jointly." If you are married but file separately, check "Married filing separately." If you are unmarried and pay more than half the costs of keeping up a home for yourself and a dependent, you may be "Head of household."

Use the filing status you plan to use on your tax return in April, not your current marital status on the day you fill out the form. If you are getting married in December but will file as single for that year, use "Single." If you are getting divorced but will file as married for the year, use "Married filing jointly" (or separately, depending on your situation). Your filing status on the W-4 should match what you actually file on your return.

Step 3: Claim dependents

A dependent is someone you support financially — usually a child under 17, a child 17 or older who is a full-time student, or another relative who lives with you and earns less than a certain amount per year. For each dependent you claim, write the number in the box on Step 3. If you have no dependents, leave it blank or write zero. Each dependent you claim reduces your withholding because the IRS assumes you will take a tax credit for that person when you file your return.

Only claim dependents you actually support. If your child lives with their other parent and that parent claims them on the tax return, you should not claim them on your W-4. If you are unsure whether someone counts as your dependent, the IRS website has a tool called the Dependent Exemption Worksheet that walks you through the rules. Claiming dependents you do not support can result in too little tax being withheld, which means you will owe money when you file your return.

Step 4: Account for multiple jobs or a working spouse

Step 4 applies only if you have more than one job at the same time, or if you are married and both you and your spouse work. When two paychecks come into the same household, the withholding from each one is calculated as if it were your only income. This can result in too little tax being withheld overall. Step 4 lets you adjust for that.

If you have a second job, you can either claim fewer allowances on the W-4 for your second job, or you can ask your employer to withhold an extra flat amount from each paycheck. The form includes a worksheet to help you figure out the right adjustment. If your spouse also works, you and your spouse can use the same worksheet together to decide which of you should make the adjustment. You do not both need to adjust — usually one adjustment on one W-4 is enough.

Step 5: Claim other income and deductions

Step 5 is for people who have income that is not subject to withholding — such as interest, dividends, or self-employment income — or who plan to itemize deductions on their tax return instead of taking the standard deduction. If you own a home with a mortgage, you may itemize and claim the mortgage interest deduction. If you have large medical expenses or make significant charitable donations, you may also itemize. The form includes a worksheet to help you calculate how much to claim.

Most people take the standard deduction, which means they skip Step 5 entirely. The standard deduction is a fixed amount the IRS lets you subtract from your income before calculating tax. For 2024, the standard deduction is $14,600 for single filers and $29,200 for married couples filing jointly, though these amounts change each year. If your deductions are larger than the standard deduction, you can claim the difference in Step 5 to reduce your withholding.

Step 6: Sign and submit your W-4

Sign and date the form at the bottom. Your signature tells your employer that the information you provided is correct. Do not mail the W-4 to the IRS — give it to your employer's payroll or human resources department. They will keep it on file and use it to calculate your withholding starting with your next paycheck.

You can submit a new W-4 at any time if your situation changes — if you get married, have a child, get a second job, or realize your withholding is too high or too low. There is no limit to how many times you can update your W-4. If you want to change your withholding mid-year, submit a new form and your employer will use the new information going forward.

Common mistakes to avoid

The most common mistake is claiming too many dependents or deductions, which results in too little tax being withheld. When you file your return in April, you will owe money instead of getting a refund. The second common mistake is not updating your W-4 when your life changes — getting married, having a child, or starting a second job. Your withholding is based on the information on your current W-4, so if that information is outdated, your withholding will be wrong.

Another mistake is confusing the W-4 with the W-2. The W-4 is what you fill out when you start a job to tell your employer how much to withhold. The W-2 is what your employer sends you in January showing how much you earned and how much was withheld. You do not fill out a W-2 — your employer does. If you receive a W-2 that shows the wrong withholding amount, contact your employer's payroll department to correct it.

Frequently Asked Questions

Can I claim zero allowances to have more tax withheld?

Yes. If you want more tax withheld from each paycheck — for example, because you have a second job or expect to owe money — you can claim fewer dependents or deductions than you actually have. You can also ask your employer to withhold an extra flat amount from each paycheck. Either method will increase your withholding.

What if I do not want any tax withheld?

You can claim exemption from withholding only if you had no tax liability last year and expect to have no tax liability this year. To do this, write "Exempt" on line 4(c) of the form. However, if you are claimed as a dependent on someone else's return, you cannot claim exemption. Exemption is temporary — it expires each February, so you will need to submit a new W-4 if you want to continue claiming exemption.

Do I need to fill out a new W-4 every year?

No. Your W-4 stays in effect until you change it. However, the IRS recommends reviewing your W-4 each year, especially after major life changes or if you received a large refund or owed money on your last return. If your withholding was significantly off, submit a new W-4 to adjust it.

What if I made a mistake on my W-4?

Submit a corrected W-4 to your payroll department. Your employer will use the new form going forward. If the mistake resulted in too much or too little withholding for the year, you will settle up when you file your tax return — either by paying what you owe or receiving a refund.

Can my employer refuse to accept my W-4?

No. Your employer must accept your W-4 as long as it is filled out and signed. However, if the IRS suspects you are claiming too many allowances to avoid withholding, they can send your employer a notice requiring a different withholding amount. This is rare and usually happens only after the IRS contacts you directly.