What goes on each line of the W-4

The W-4 form has six main sections. You fill in your name, address, and Social Security number at the top. Then you move through a series of steps that adjust how much tax your employer withholds from each paycheck. The form walks you through these steps in order, and most people only need to complete steps 1 through 4.

Step 1 is your personal information: full name, address, Social Security number, and filing status (single, married filing jointly, married filing separately, or head of household). Your filing status on the W-4 should match what you plan to file on your tax return.

Step 2 is where you claim dependents — children under 17, or other relatives you support. Each dependent reduces your withholding because you will claim them on your tax return. The form tells you to enter the number of dependents and multiply by $2,000 (the current child tax credit amount), though this number can change year to year.

Step 3 accounts for other income. If you have a second job, rental income, or investment income, you report it here so your employer can withhold enough to cover all your income, not just what they pay you.

Step 4 is for tax deductions and credits that are not dependents. Most people leave this blank and claim their standard deduction on their tax return instead. You only fill this in if you have itemized deductions or other credits you want to account for now.

Key Takeaways

  • Your filing status on the W-4 must match the status you will use when you file your tax return, or your withholding will be wrong.
  • Dependents reduce your withholding because they lower your tax bill; each dependent is worth $2,000 in reduced withholding.
  • If you have a second job or other income sources, report them in Step 3 so your employer withholds enough tax across all your income.
  • Most people only need to complete Steps 1 and 2; Steps 3 and 4 are for specific situations like multiple jobs or large deductions.
  • You can change your W-4 at any time during the year if your situation changes, and your employer must process it within a reasonable time.

When to claim zero allowances versus dependents

The older version of the W-4 used "allowances" or "exemptions." The current W-4 uses dependents instead, which is simpler. If you are filling out a new W-4, ignore allowances entirely — they do not appear on the current form.

You should claim the actual number of dependents you have. If you have no dependents, you enter zero in Step 2. If you have two children, you enter two. The form then calculates the withholding reduction automatically. Do not claim dependents you do not have in order to get a bigger paycheck — you will owe the money back when you file your tax return, plus penalties and interest.

Adjusting withholding if you owe or get a refund

If you owed money when you filed your last tax return, your withholding was too low. If you got a large refund, your withholding was too high. You can adjust this on a new W-4 without waiting for next year.

To withhold more, you can enter an additional amount in Step 4(c), labeled "Other income." Write in a dollar amount — for example, $50 per paycheck — and your employer will withhold that extra amount. To withhold less, reduce the number of dependents you claim in Step 2, though this is riskier because you might end up owing again.

The safest approach is to use the IRS withholding calculator on irs.gov. You enter your income, filing status, dependents, and what you owed or refunded last year, and it tells you exactly what to enter on your W-4. This takes about ten minutes and removes the guesswork.

What happens after you submit your W-4

You give your completed W-4 to your employer's payroll or human resources department. They enter the information into their system, and your withholding changes on your next paycheck. There is no approval process — your employer is required to honor what you submit.

Keep a copy of your W-4 for your records. You do not send it to the IRS; your employer keeps it on file. If you change jobs, you will need to fill out a new W-4 for the new employer, because withholding instructions do not transfer between employers.

If you made a mistake on your W-4, you can fill out a new one at any time. Your new W-4 replaces the old one, and the new withholding takes effect on your next paycheck. There is no penalty for changing it.

Common mistakes to avoid

The most common mistake is claiming a filing status that does not match your tax return. If you are married but file as single on your W-4, your withholding will be wrong. If you are single but claim married, you will withhold too little. Check your last tax return to see what status you used.

Another mistake is not updating your W-4 when your situation changes. If you get married, have a child, or get divorced, you should fill out a new W-4. The IRS recommends doing this within 10 days of the change, though there is no legal penalty if you do not. The longer you wait, the more your withholding will be off.

A third mistake is claiming dependents you do not actually support. The IRS defines a dependent as someone you provide more than half the financial support for during the year. If you claim a dependent you do not support, you will owe taxes plus penalties when you file.

Filling out a W-4 for multiple jobs

If you have two or more jobs, your withholding across all jobs combined needs to cover your total tax bill. The problem is that each employer withholds based only on what they pay you, not on your total income.

The W-4 has a section for this: Step 3, "Other income." If you have a second job, you report the expected income from that job here. Your primary employer then withholds extra to account for the second job's income. Alternatively, you can have your second employer withhold at a higher rate by claiming fewer dependents there.

The IRS withholding calculator handles this automatically if you tell it about all your jobs. You enter each job's expected income, and it tells you what to put on each W-4 so that your combined withholding is correct.

Special situations: Self-employment, side income, and investments

If you are self-employed or have a side business, you do not have an employer to withhold taxes. You are responsible for paying estimated taxes quarterly to the IRS. Your W-4 from your main job does not account for self-employment income, so you need to calculate and pay estimated taxes separately. The IRS Form 1040-ES walks you through this.

If you have investment income, rental income, or other non-wage income, report it in Step 3 of your W-4 so your employer withholds enough. Again, the withholding calculator on irs.gov handles this if you enter all your income sources.

If you are a student or dependent claimed on someone else's tax return, you may be able to claim exemption from withholding if your income is below a certain threshold. This is rare and only applies if you had no tax liability last year and expect none this year. If this applies to you, write "Exempt" on line 4(c) of your W-4. You will still need to file a tax return if you had taxes withheld.

Frequently Asked Questions

Can I claim my spouse as a dependent on my W-4?

No. Dependents on a W-4 are children under 17 or other relatives you support. Your spouse is not a dependent, even if they do not work. Your filing status (married filing jointly or married filing separately) is what accounts for your spouse on the W-4.

What if I do not know my filing status yet?

Use the status you expect to have on December 31 of that tax year. If you are getting married in November, use married filing jointly. If you are getting divorced, use single. You can always file an amended W-4 later if your situation changes.

Do I have to fill out a W-4 if I am a contractor or freelancer?

No. Contractors fill out a W-9 instead, which tells your client your tax ID. You do not have an employer withholding taxes, so you pay estimated taxes yourself. A W-4 only applies to employees with an employer.

How often should I update my W-4?

Update it whenever your situation changes: marriage, divorce, birth of a child, change in income, or change in other jobs. You can also update it annually if your withholding was significantly off last year. There is no requirement to update it every year if nothing has changed.

What if I want to withhold extra money for taxes?

Enter the extra amount in Step 4(c), labeled "Other income." Write in a dollar amount per paycheck — for example, $25 — and your employer will withhold that in addition to the normal amount. This is useful if you have side income or investment income that is not being withheld.