What goes on each line of the W-4

The W-4 is a form you give your employer so they know how much federal income tax to take from each paycheck. The IRS redesigned it in 2020, and the current version has five main sections. You fill in your name, address, and Social Security number at the top, then work through the numbered steps that follow.

Each step asks for different information: whether you have multiple jobs, whether you have dependents, whether you claim certain tax credits, and whether you want extra money withheld. You do not need to fill every line — many people skip steps that do not explore to them. The form tells you which steps to complete based on your situation.

Key Takeaways

  • Step 1 is basic information: name, address, Social Security number, and whether you are single or married filing jointly.
  • Step 2 asks whether you have more than one job or whether your spouse works — this affects how much tax is withheld.
  • Step 3 is for dependents: children and other people you claim on your tax return, which lowers your withholding.
  • Step 4 lets you claim tax credits like the child tax credit or education credits if you expect to owe them.
  • Step 5 is optional: you can ask your employer to withhold extra money from each paycheck if you want a bigger refund.

Step 1: Personal information and filing status

At the top of the form, write your full name, home address, and nine-digit Social Security number exactly as they appear on your Social Security card. The form asks for your city, state, and ZIP code separately.

Below that, you choose your filing status: Single, Married Filing Jointly, Married Filing Separately, or Head of Household. Pick the one that matches how you will file your tax return at the end of the year. If you are married and both of you work, you each fill out your own W-4 — do not try to combine your information on one form.

Step 2: Multiple jobs or spouse income

This step matters only if you have more than one job at the same time, or if you are married and your spouse also works. If neither applies to you, leave this step blank and move to Step 3.

If you do have multiple jobs or a working spouse, the form directs you to use a worksheet or an online calculator on the IRS website. The worksheet helps you figure out how much extra tax should come out of your paychecks so you do not end up owing money in April. The calculator is faster and does the math for you — you can find it at irs.gov by searching "W-4 calculator."

Step 3: Claim dependents

A dependent is someone you support financially and claim on your tax return — usually your children, but sometimes a parent, grandchild, or other relative. For each dependent, you enter their name and age on the form. This lowers the amount of tax your employer withholds because dependents reduce your taxable income.

Only claim dependents you actually support and plan to list on your tax return. If you are not sure whether someone counts as your dependent, the IRS website has a tool called the Dependent Exemption Worksheet that walks you through the rules. Do not guess — claiming dependents you are not may have access to to can cause problems when you file your return.

Step 4: Other income and tax credits

This step is for tax credits you expect to claim, such as the Earned Income Tax Credit (EITC) or the Child and Dependent Care Credit. You enter the amount of the credit you think you will owe, and your employer withholds less money to account for it. This is optional — many people skip this step because they do not claim these credits, or because they prefer to claim them when they file their return instead.

You also use this step if you have income that is not from a job — such as interest, dividends, or self-employment income. Enter the amount you expect to earn from those sources, and your employer will adjust your withholding upward to cover the tax on that income.

Step 5: Extra withholding

Step 5 lets you ask your employer to take out more federal tax than they normally would. Some people do this if they know they will owe money in April, or if they want a larger refund. You can enter a dollar amount — for example, $50 per paycheck — and that amount will be withheld in addition to the regular calculation.

This step is entirely optional. If you do not want extra withholding, leave it blank. You can change your W-4 at any time during the year if your situation changes — for example, if you get married, have a child, or lose a job.

When to submit your W-4 and what happens next

Give the completed W-4 to your employer's payroll or human resources department. If you are starting a new job, you usually fill it out on your first day or during onboarding. Your employer is required to keep it on file and use it to calculate your withholding starting with your next paycheck.

If you change jobs, you need to fill out a new W-4 for each employer. Your old W-4 does not carry over. If your situation changes during the year — you get married, have a baby, or lose a second job — you can submit a new W-4 to your current employer at any time, and the new withholding takes effect on your next paycheck.

Common mistakes to avoid

The most common mistake is claiming too many dependents or tax credits you do not actually have. This causes too little tax to be withheld, and you end up owing money in April. The second mistake is leaving Step 2 blank when you have multiple jobs — this can result in significant underwithholding.

Another frequent error is writing the wrong Social Security number or misspelling your name. These do not affect your withholding, but they can cause problems when your employer reports your income to the IRS. Double-check that your name and number match your Social Security card exactly.

Some people also forget to update their W-4 after major life changes. If you get married, have a child, or claim a dependent for the first time, submit a new W-4 so your withholding reflects your current situation. The form is free to change, and you can do it as many times as you need.

Frequently Asked Questions

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 not sure, use Single for now — you can always submit a new W-4 later if your situation changes. Your filing status on your W-4 does not lock you in; it just tells your employer how to calculate withholding.

Do I have to fill out Step 2 if I have two jobs?

Yes, you should. Without it, your employer does not know you have another job, and both employers will withhold as if you only work for them. This usually results in too little tax being taken out overall. Use the IRS calculator or worksheet to figure out the right amount.

Can I claim my spouse as a dependent?

No. Spouses are never claimed as dependents, even if they do not work. If you are married filing jointly, your spouse's income is already part of your household, and you account for that in Step 2 instead.

What if I want a bigger tax refund?

You can enter an amount in Step 5 to have extra money withheld from each paycheck. For example, if you want an extra $100 per month withheld, enter $100 in Step 5. That money will be returned to you as part of your refund when you file your tax return.

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

No. Your W-4 stays in effect until you change it or leave the job. You only need to submit a new one if your situation changes — you get married, have a child, claim a new dependent, or want to change your withholding amount.