Federal W-4 Helper (Fill Form W-4 and See Your Paycheck Change)

About the Federal W-4 Helper (Fill Form W-4 and See Your Paycheck Change)

Form W-4 tells your employer how much federal income tax to withhold from each paycheck. Steps 2 to 4 are where most people go wrong: a second job or a working spouse (Step 2), children and other dependents (Step 3), and other income, deductions and extra withholding (Step 4). This helper asks plain questions, works through the form's own Multiple Jobs and Deductions Worksheets line by line, and shows what each entry does to your federal withholding per paycheck under IRS Publication 15-T.

It then fills the official 2026 Form W-4 for you to print, sign and hand to your employer, with both worksheets filled in for your records. Write your Social Security number and sign Step 5 by hand. The form is filled in your browser, and nothing you type is sent anywhere.

Step 2: more than one job

Use Step 2 if you hold more than one job at a time, or you are married filing jointly and your spouse works too. The form gives three ways: (a) the IRS Tax Withholding Estimator, the most accurate and the one to use with self-employment income; (b) the Multiple Jobs Worksheet, whose result goes in Step 4(c) of the highest paying job; or (c) with exactly two jobs in total, the box checked on both forms, which halves the standard deduction and brackets for each job. The form says (c) is generally more accurate when the lower pay is more than half of the higher pay. The worksheet’s tables stop at three jobs and at $120,000 for the lower paying job: beyond that, Publication 505 or the estimator.

Step 3: dependents

If your total income will be $200,000 or less ($400,000 or less married filing jointly), enter $2,200 for each qualifying child under 17 and $500 for each other dependent. Other credits you expect, such as education credits or the foreign tax credit, go in Step 3 at any income (Publication 505). A qualifying child must have a Social Security number valid for employment.

Step 4: other income, deductions and extra withholding

• 4(a): income not from jobs that has no withholding, such as interest, dividends and retirement income.
• 4(b): the Deductions Worksheet: qualified tips (up to $25,000) and the “and-a-half” part of overtime (up to $12,500, or $25,000 jointly) when total income is under $150,000 ($300,000 jointly); passenger vehicle loan interest up to $10,000 under $100,000 ($200,000); $6,000 for each of you aged 65 or older under $75,000 ($150,000); student loan interest, IRA and other adjustments; and itemized deductions beyond the standard deduction, or cash gifts to charity up to $1,000 ($2,000 jointly) if you take the standard deduction. A married person takes the tips, overtime and senior deductions only on a joint return. State and local taxes count up to $40,400 ($20,200 married filing separately); above $505,000 of income ($252,500) that limit is cut by 30 % of the excess, to no less than $10,000 ($5,000).
• 4(c): any extra amount you want withheld each pay period, with the Multiple Jobs Worksheet’s line 4.

Exemption from withholding

You can claim exemption only if you had no federal income tax liability last year and expect none this year. Then you check the box, fill in Steps 1(a), 1(b) and 5, and nothing else; no income tax is withheld. The exemption lasts for the year on the form, and you need a new Form W-4 to keep it for the next year.

When to use the IRS estimator instead

The form itself recommends the Tax Withholding Estimator if you start a job after the beginning of the year, work only part of the year, have changes during the year, receive dividends, capital gains, social security, bonuses or business income, or owe the Additional Medicare Tax or the Net Investment Income Tax.

Limitations

• Federal income tax only: Social Security and Medicare are fixed shares of pay, and states have their own withholding forms.
• Withholding per paycheck follows Publication 15-T’s percentage method for automated payroll (Worksheet 1A); your employer’s payroll may round a little differently.
• Self-employment income, more than three jobs, or more than one job over $120,000 need the IRS estimator or Publication 505’s tables.
• The deductions you enter are your estimates; whether you qualify for each is set out in the instructions for Schedule 1-A (Form 1040).
• It fills the 2026 Form W-4; a new form is published for each year.

Privacy

On this device; its files download once

Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot. Loads the blank Form W-4 (a file of this site) when it draws the form; what you type stays on your device.