Starting a new job? One of the first papers you will fill out is the W-4. It looks more complicated than it is. This page walks through it, one step at a time, in plain words.
The W-4 is the form a new employee fills out so the employer knows how much federal income tax to hold back from each paycheck. That held-back money is called withholding. It goes to the IRS during the year, a little at a time, instead of all at once at tax time.
You fill one out when you start a new job. You can also hand your employer a new W-4 later, whenever your life changes — for example, if you get married, have a child, or take on a second job.
The form has five steps. That sounds like a lot. Here is the part that matters most:
Most people only have to complete Step 1 and Step 5.
Steps 2, 3, and 4 are only for people whose situation fits them. If they don't fit you, you skip them.
The IRS says only Steps 1 and 5 are required for everyone. The rest of the form is there for people who need it.
A quick map before the details. Each step below says who it is for.
About you Everyone Your name, Social Security number, address, and filing status.
More than one job Only if it fits you For people with two jobs at once, or a working spouse when filing jointly.
Dependents Only if it fits you For people with children or other dependents, if their income qualifies.
Other adjustments Optional Other income, extra deductions, or extra tax you want held back.
Sign and date Everyone Without your signature, the form does not count.
Read the two steps everyone does. Then read the middle steps only if they sound like your life.
EVERYONE DOES THIS STEP
You write down your name, your Social Security number, your address, and your filing status — that is how you file your taxes, such as Single, Married filing jointly, or Head of household.
That is all Step 1 asks for. Nothing tricky here.
ONLY IF YOU HAVE TWO JOBS, OR A WORKING SPOUSE
Do this step only if one of these is true:
Why it exists: each job on its own does not know about the other one, so too little tax can get held back if nobody adjusts for it.
The form offers three ways to handle this step. The most accurate one is the free IRS Tax Withholding Estimator online — it walks you through your own numbers and tells you what to put on the form.
If neither bullet above fits you, skip this step.
ONLY IF YOU HAVE DEPENDENTS AND YOUR INCOME QUALIFIES
This step is about the children and other dependents you support. If your income qualifies, you enter a dollar amount for each one:
You add those amounts up and put the total on the form. Filling in this step lowers how much tax is held back from each paycheck.
No dependents? Skip this step.
OPTIONAL — ONLY IF YOU WANT TO FINE-TUNE
This whole step is optional. It has three parts, and you can use any, all, or none of them:
Other income Money you expect to get that no employer holds tax back from — like interest, dividends, or a side gig. Listing it here means a little more tax is held from your paycheck to cover it.
Extra deductions If you expect deductions beyond the standard one, you can enter them here. That lowers how much is held back.
Extra withholding Any extra amount you want held back from each paycheck, on top of the normal amount. Some people do this on purpose so they are less likely to owe at tax time.
None of that fits? Leave Step 4 blank and move on.
EVERYONE DOES THIS STEP
Sign your name and write the date. That is the whole step — and it matters: an unsigned form does not count.
Then hand the form to your employer. You do not mail it to the IRS.
You may have heard older advice about “claiming 0 allowances” or “claiming 1 allowance.” That advice is dead.
The IRS removed allowances when it redesigned the W-4 in 2020. The current form has no allowances to claim anywhere on it.
So if a website, a video, or an old paper form talks about allowances, it is out of date. Put it down and use the current form instead.
Your job can still pay you — but your employer has to pick a setting for you. Without your W-4, the employer withholds as if you were Single with no other adjustments.
That setting does not know anything about your real life. For many people it means too much tax is held back from every paycheck — money you could have had during the year, coming back later as a refund instead.
Turning in the form takes a few minutes and puts you in charge of the setting. That is the better deal.
The W-4 is not a “set it and forget it forever” paper. Three simple habits keep it right:
A new W-4 replaces the old one. You can hand your employer a fresh one whenever you need to.
General information only — not tax advice.
Sources: Internal Revenue Service (IRS) — Form W-4 and the IRS Tax Withholding Estimator.
Checked November 2026.