Updated October 16, 2026. Quick answer: Form W-4 is the Employee’s Withholding Certificate. The form says to complete it so that your employer can withhold the correct federal income tax from your pay. The one decision is how much to adjust in Steps 2 through 4 for a second job, dependents, other income, deductions or extra withholding, or whether you qualify to claim exemption from withholding.
IRS worksheets read line by line: W-4 Multiple Jobs Worksheet and W-4 Deductions Worksheet.
More IRS forms and schedules for individual filers, read line by line: Form 8839 instructions, Form 8839 Part III employer adoption benefits and qualified adoption expenses on Form 8839.
More IRS forms for employers and business owners, read line by line: Form 940 instructions, Form 943 instructions and Form 944 instructions.
Related reading on this site: IRS Publication 505.
More IRS forms and schedules, read line by line: Form SS-5 instructions, Form 4852 substitute W-2 or 1099-R and Form 8919 uncollected social security tax.
Retirement forms read line by line: Form W-4P Step 1, Form W-4P Step 2 and Form W-4P Step 3.
Schedule 3 (Form 1040) for 2025, read line by line: Schedule 3 line 11.
Schedule 2 (Form 1040) for 2025, read line by line: Schedule 2 line 9.
Form 1040 for 2025, lines 12 to 38 read line by line: Form 1040 lines 32 and 33, Form 1040 lines 34 to 36 and Form 1040 line 38.
Form 1040 for 2025, read line by line: Form 1040 line 1a, Form 1040 line 1b and Form 1040 line 1c.
More IRS forms and schedules, read line by line: Form W-3 instructions and Form 4868 extension.
Related reading on this site: W-2 filing deadline.
The employee copy of Form W-2, read box by box: W-2 box 10, W-2 box 13 third-party sick pay and W-2 box 14.
The employee copy of Form W-2, read box by box: W-2 box 2, W-2 box 6 and W-2 box 7.
What Form W-4 is for
The form’s title is “Employee’s Withholding Certificate”. Its purpose is stated in the first lines: “Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay.” The employee hands it to the employer, and the form adds that “Your withholding is subject to review by the IRS.”
The instructions explain what is at stake in both directions. “If too little is withheld, you will generally owe tax when you file your tax return and may owe a penalty.” The other direction is also printed: “If too much is withheld, you will generally be due a refund.”
When to complete a new Form W-4
A certificate is not a one-time document. “Complete a new Form W-4 when changes to your personal or financial situation would change the entries on the form.” The instructions point to the IRS estimator for the situations where a simple form is least accurate, and the IRS publishes it as the Tax Withholding Estimator. The form’s tip begins “Consider using the estimator at www.irs.gov/W4App to determine the most accurate withholding for the rest of the year if you:” and the list that follows covers a form submitted after the start of the year, part-year work, changes in marital status, jobs or dependents, and several kinds of investment and business income.
Owners of a retirement account who also draw a paycheck sometimes want a separate calculation for the withholding on distributions, which is a different question covered on the retirement withholding calculator page.
Key numbers at a glance
The dollar figures on the form are collected here as the form prints them. The Step 3 amounts apply only below the income limit shown in the first row.
| Item | As printed on the form |
|---|---|
| Step 3 income limit | “If your total income will be $200,000 or less ($400,000 or less if married filing jointly):” |
| Qualifying children | “Multiply the number of qualifying children under age 17 by $2,200” |
| Other dependents | “Multiply the number of other dependents by $500” |
| Qualified tips (Step 4(b) worksheet) | “If your total income is less than $150,000 ($300,000 if married filing jointly), enter an estimate of your qualified tips up to $25,000” |
| Seniors (Step 4(b) worksheet) | “Seniors age 65 or older. If your total income is less than $75,000 ($150,000 if married filing jointly):” |
| Exemption deadline | “You will need to submit a new Form W-4 by February 16, 2027.” |
Step 1 and the step-by-step walk
Step 1 collects the personal information and the filing status. The form lets you complete Steps 2 through 4 only when they apply: they are optional adjustments, and Step 5 is the signature that makes the form valid. The table lists what the instructions say about each step in order.
| Step | As printed on the form |
|---|---|
| Step 1 | “Check your anticipated filing status. This will determine the standard deduction and tax rates used to compute your withholding.” |
| Step 2 | “Use this step if you (1) have more than one job at the same time, or (2) are married filing jointly and you and your spouse both work.” |
| Step 3 | “This step provides instructions for determining the amount of the child tax credit and the credit for other dependents that you may be able to claim when you file your tax return.” |
| Step 4(a) | “Enter in this step the total of your other estimated income for the year, if any.” |
| Step 4(c) | “Enter in this step any additional tax you want withheld from your pay each pay period” |
| Step 5 | “Employee’s signature (This form is not valid unless you sign it.)” |
The head of household box on the form carries a condition of its own: “Check only if you’re unmarried and pay more than half the costs of keeping up a home for yourself and a qualifying individual.” How that status works for a household that includes a parent is covered on the head of household with a parent page.
Step 2: multiple jobs or a working spouse
This step matters most for households with two paychecks. “Complete this step if you (1) hold more than one job at a time, or (2) are married filing jointly and your spouse also works.” “The correct amount of withholding depends on income earned from all of these jobs.”
The form offers three routes and says “Do only one of the following.” The instructions rank two of them: “Option (a) most accurately calculates the additional tax you need to have withheld, while option (b) does so with a little less accuracy.”
The third route is a checkbox for households with exactly two jobs in total. The instructions explain what the box does: “If the box is checked, the standard deduction and tax brackets will be cut in half for each job to calculate withholding.” The tradeoff is also printed: “This option is accurate for jobs with similar pay; otherwise, more tax than necessary may be withheld, and this extra amount of tax withheld will be larger the greater the difference in pay is between the two jobs.”
Each job gets its own certificate, and the instructions say “Submit a separate Form W-4 for each job.” Steps 3 through 4(b) are filled in on only one of the forms. “Complete Steps 3 through 4(b) on only one Form W-4.” The form adds that “Withholding will be most accurate if you do this on the Form W-4 for the highest paying job.”
The Multiple Jobs Worksheet on page 3 carries a refresh reminder: “To be accurate, submit a new Form W-4 for all other jobs if you have not updated your withholding since 2019.” Pay periods enter the worksheet as well: “For example, if that job pays weekly, enter 52; if it pays every other week, enter 26; if it pays monthly, enter 12, etc.”
Step 3: dependents and other credits
Step 3 is where children and other dependents reduce withholding. The conditions for the child tax credit are written out: “To qualify for the child tax credit, the child must be under age 17 as of December 31, must be your dependent who generally lives with you for more than half the year, and must have the required social security number.”
Other credits can be added to the same line. The instructions say “You can also include other tax credits for which you are eligible in this step, such as the foreign tax credit and the education tax credits.” The effect on the paycheck is stated plainly: “Including these credits will increase your paycheck and reduce the amount of any refund you may receive when you file your tax return.”
Computed illustration, not an IRS example: for a household under the income limit with 2 qualifying children and 1 other dependent, the computed amount is $2,200 times 2 children, which is $4,400, plus $500 for the other dependent, which is $4,900 on line 3, before any other credits.
Step 4: other income, deductions and extra withholding
Step 4 has three separate lines. Line 4(a) is for income that has no withholding of its own: “If you want tax withheld for other income you expect this year that won’t have withholding, enter the amount of other income here.” The instructions add a limit and a payoff. “You shouldn’t include income from any jobs or selfemployment.” “If you complete Step 4(a), you likely won’t have to make estimated tax payments for that income.” The estimated tax form itself is covered on the Form 1040-ES page.
Line 4(b) works the other way. “If you skip this line, your withholding will be based on the standard deduction.” The worksheet on page 4 supports it, and the instructions list who may use it: itemized deductions and the deductions for qualified tips, overtime compensation, passenger vehicle loan interest, student loan interest, IRAs and seniors.
Line 4(c) is the simplest tool. “Entering an amount here will reduce your paycheck and will either increase your refund or reduce any amount of tax that you owe when you file your tax return.”
Computed illustration, not an IRS example: for a worker paid every other week, which the form counts as 26 pay periods, the computed amount of extra withholding from entering $50 on line 4(c) is $50 times 26 pay periods, which is $1,300 over a full year.
Self-employed workers with a paycheck have a route of their own. “If you want to pay these taxes through withholding from your wages, use the estimator at www.irs.gov/W4App to figure the amount to have withheld.” The tax on that income is explained on the self-employment tax page.
Claiming exemption from withholding
The exemption has two conditions, and both must be true. “You may claim exemption from withholding for 2026 if you meet both of the following conditions: you had no federal income tax liability in 2025 and you expect to have no federal income tax liability in 2026.”
The instructions define the first condition: “You had no federal income tax liability in 2025 if (1) your total tax on line 24 on your 2025 Form 1040 or 1040-SR is zero (or less than the sum of lines 27a, 28, 29, and 30), or (2) you were not required to file a return because your income was below the filing threshold for your correct filing status.”
The cost of getting this wrong is printed: “If you claim exemption, you will have no income tax withheld from your paycheck and may owe taxes and penalties when you file your 2026 tax return.” The form then limits the rest of the certificate: “Then, complete Steps 1(a), 1(b), and 5. Do not complete any other steps.” An exemption does not carry over to the next year, since “You will need to submit a new Form W-4 by February 16, 2027.”
If the form is incomplete
The privacy notice on the form describes what follows from an incomplete certificate: “Failure to provide a properly completed form will result in your being treated as a single person with no other entries on the form”. It adds that “providing fraudulent information may subject you to penalties.” The signature block carries the declaration: “Under penalties of perjury, I declare that this certificate, to the best of my knowledge and belief, is true, correct, and complete.”
Which revision applies
The edition read for this page is Form W-4 (2026), which is the revision irs.gov served when it was read on 2026-10-16. Check the revision printed on the form you are handing to an employer, because a later revision can change the credit amounts, the worksheet thresholds and the deadline for a new certificate.
Common mistakes
- Filling in Steps 3 and 4(b) on the certificate for every job. The instructions say to complete Steps 3 through 4(b) on only one Form W-4, and withholding is most accurate on the form for the highest paying job.
- Checking the Step 2(c) box when the two jobs pay very differently. The instructions say the option is accurate for jobs with similar pay, and that otherwise more tax than necessary may be withheld.
- Treating an exemption as permanent. The instructions require both conditions to be met, say no income tax will be withheld, and say a new Form W-4 is needed by the printed February date.
Related: Form 1040-ES estimated tax, Form 2210 underpayment penalty, safe harbor estimated taxes, Form W-4V Social Security withholding, Form W-4P pension withholding, Form W-4R retirement distribution withholding, and self-employment tax explained.
Sources
- Form W-4 (2026), Employee’s Withholding Certificate: https://www.irs.gov/pub/irs-pdf/fw4.pdf
Read from the IRS documents linked above on October 16, 2026. General information, not tax advice. Your own facts decide the outcome, and a preparer, the account provider or the IRS is the right place to confirm anything consequential.