What the form does
The IRS states the purpose in its first instruction: complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. The employer feeds your answers into the withholding tables; nothing you enter is a tax return, and the return you file the following spring reconciles whatever was withheld against the tax you actually owe. Too little withheld means a bill and possibly a penalty; too much means an interest-free loan to the government returned as a refund. The paycheck calculator shows what a given set of W-4 choices does to the take-home figure.
The five steps
| Step | What it asks | Who fills it in |
|---|---|---|
| 1 | Name, address, Social Security number, filing status: single or married filing separately; married filing jointly or qualifying surviving spouse; head of household | everyone |
| 2 | More than one job at a time, or married filing jointly with a working spouse | households with more than one income |
| 3 | Qualifying children under 17 and other dependents, as credit amounts | people with dependents whose income is $200,000 or less ($400,000 jointly) |
| 4 | (a) other income without withholding, (b) deductions beyond the standard deduction, (c) extra withholding per paycheck | anyone adjusting the result |
| 5 | Signature and date | everyone; the form is not valid unsigned |
The form's own instruction is to complete Steps 2 to 4 only if they apply to you, otherwise skip to Step 5. The filing status in Step 1 is the biggest single lever, because it selects the withholding table; the married-filing-jointly table assumes the household has one income unless Step 2 says otherwise.
Step 2: more than one income
Withholding tables assume each job is the household's only income. With two jobs, or two working spouses, each employer withholds as if its paycheck were the whole picture, and the household comes up short. The form gives three ways to correct it, and asks you to use only one:
- 2(a): the estimator at irs.gov/W4App, which the form calls the most accurate option for this step and for Steps 3 and 4, and the right choice when you or your spouse have self-employment income.
- 2(b): the Multiple Jobs Worksheet on page 3, whose result goes into Step 4(c) as extra withholding per paycheck.
- 2(c): the checkbox, if there are only two jobs in total, ticked on the W-4 for both jobs. The form says this is generally more accurate than 2(b) when pay at the lower-paying job is more than half of the pay at the higher-paying job, and 2(b) is more accurate otherwise.
Whichever you choose, the form says to complete Steps 3 and 4(b) on the W-4 for only one of the jobs, and that the result is most accurate when that is the highest-paying job.
Step 3: dependents as dollars
Step 3 applies if your total income will be $200,000 or less, or $400,000 or less if married filing jointly. Multiply the number of qualifying children under 17 by $2,200 and the number of other dependents by $500, add any other credits you expect, and enter the total. The employer spreads that amount across the year's paychecks as a reduction in withholding. The figures mirror the child tax credit and the credit for other dependents.
| Children under 17 | Other dependents | Step 3 total |
|---|---|---|
| 1 | 0 | $2,200 |
| 2 | 0 | $4,400 |
| 2 | 1 | $4,900 |
| 3 | 0 | $6,600 |
| 0 | 2 | $1,000 |
Step 4: the adjustments
- 4(a) Other income. Income with no withholding of its own, interest, dividends, retirement income, so that the job's withholding covers it. Self-employment income is the exception: the form points to the estimator, and the guide estimated quarterly taxes 2026 covers the alternative of paying it directly.
- 4(b) Deductions. Only if you expect to itemize more than the standard deduction; the Deductions Worksheet on page 3 turns the difference into a figure for this line.
- 4(c) Extra withholding. A flat dollar amount taken from every paycheck on top of the calculated withholding. It is the simplest fix for a bill, and the line the Multiple Jobs Worksheet feeds.
Step 4(c) is per paycheck, so the same yearly correction is a different line entry depending on how often you are paid. If last year ended with a $1,800 bill and nothing else changes:
| Pay frequency | Paychecks a year | Step 4(c) to cover $1,800 |
|---|---|---|
| Weekly | 52 | $35 |
| Biweekly | 26 | $69 |
| Semimonthly | 24 | $75 |
| Monthly | 12 | $150 |
The raise calculator shows what a pay change does to the yearly figure, and the salary converter turns a yearly amount into the per-paycheck figure for any schedule.
Claiming exemption
An employee who had no federal income tax liability last year and expects none this year can claim exemption from withholding by writing "Exempt" in the space the form indicates, below Step 4(c), and completing Steps 1 and 5 only. The 2026 form reminds those who do so that they will need to submit a new Form W-4 for 2027; exemption lasts one year.
When to file a new one
The IRS suggests considering a new Form W-4 each year and whenever your personal or financial situation changes. In practice the triggers are a marriage or divorce, a child, a second job or a spouse starting or stopping work, a move into self-employment on the side, and a surprise in April either way. The IRS Tax Withholding Estimator runs the whole year with your actual pay stubs and tells you what to enter; the form itself suggests using it again at the beginning of the next year to recheck. A new W-4 replaces the old one from the next payroll the employer processes, so a mid-year change only corrects the remaining paychecks.
Frequently asked questions
What is Form W-4 for?
The IRS puts it in one sentence: complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. The employer uses what you enter, your filing status, other jobs, dependents, other income and deductions, to set the withholding on each paycheck. It is not a tax return and nothing on it is final; the return in April settles the difference.
Do I have to fill out every step?
No. The form says to complete Steps 2 to 4 only if they apply to you and otherwise skip to Step 5. Step 1 (name, Social Security number, filing status) and Step 5 (signature) are the only required parts. A single person with one job, no dependents and no other income signs after Step 1 and is done.
What do I put on the W-4 if I have two jobs or my spouse works?
Step 2 handles it, and the form offers three ways: use the IRS estimator at irs.gov/W4App for the most accurate result; use the Multiple Jobs Worksheet on page 3 and enter the result in Step 4(c); or, if there are only two jobs in total, check the box in Step 2(c) on both forms. The form says the checkbox is generally more accurate when pay at the lower-paying job is more than half of the pay at the higher-paying job, and Step 2(b) is more accurate otherwise. Complete Steps 3 and 4(b) on only one of the forms, the one for the highest-paying job.
How do dependents work on the W-4?
Step 3, if your total income will be $200,000 or less, or $400,000 or less if married filing jointly: multiply the number of qualifying children under 17 by $2,200, the number of other dependents by $500, add any other credits, and enter the total. The employer reduces your withholding by that amount over the year. Two children and one other dependent is $4,900.
When should I submit a new W-4?
The IRS suggests considering a new one each year and whenever your personal or financial situation changes: marriage, a child, a second job, a spouse starting or stopping work, or a big refund or bill last April. Anyone who claimed exemption from withholding has to submit a new form each year; the 2026 form says so for 2027.
Sources
- IRS Form W-4 (2026), Employee's Withholding Certificate (PDF): the five steps, the Step 2 options and the two-jobs checkbox rule, the Step 3 amounts of $2,200 and $500 under $200,000 or $400,000 of income, Step 4 other income, deductions and extra withholding, exemption from withholding and the new form for 2027, the Multiple Jobs Worksheet
- IRS: About Form W-4 (complete it so your employer can withhold the correct federal income tax; consider a new form each year and when your situation changes; the 2026 revision)
- IRS: Tax Withholding Estimator (the online tool the form refers to as irs.gov/W4App)