The W-4 Form in 2026: How to Fill It Out Correctly
A plain-English walkthrough of every line on IRS Form W-4 for 2026, with examples for single filers, married couples, and multiple jobs.
What Form W-4 does
Form W-4 is the certificate you give your employer to tell them how much federal income tax to withhold from each paycheck. It does not affect FICA, state, or local tax.
The IRS redesigned it in 2020 to remove 'allowances' and replace them with plainer dollar-based inputs. The 2026 version keeps that structure.
Step 1 — Personal info and filing status
Enter your legal name, address, SSN, and filing status: Single or married filing separately, Married filing jointly (or qualifying surviving spouse), or Head of household.
Filing status alone determines the standard deduction your employer applies — $16,100, $30,000, or $22,500 for 2026.
Step 2 — Multiple jobs or working spouse
This step is where most under-withholding happens. If you work more than one job, or you're married filing jointly and your spouse also works, complete Step 2 on the higher-paying job's W-4.
You have three options: (a) use the IRS online estimator (most accurate), (b) use the Multiple Jobs Worksheet on page 3, or (c) check the box in Step 2(c) if there are only two jobs and pay is roughly similar.
Step 3 — Dependents
Multiply the number of qualifying children under 17 by $2,000 and other dependents by $500. Enter the total. This reduces annual withholding by that amount.
Only complete Step 3 on one W-4 if you have multiple jobs — otherwise the credit gets applied twice.
Step 4 — Other adjustments (optional)
Line 4a is for other annual taxable income not from jobs (interest, dividends, self-employment). Line 4b is for deductions above the standard deduction. Line 4c is any extra flat-dollar amount you want withheld each pay period.
Line 4c is the fastest way to fix chronic under-withholding — just add a fixed dollar amount per check.
Step 5 — Sign and date
Give the completed form to your employer's payroll or HR team, not the IRS. Employers must implement changes by the first pay period 30 days after receipt.
When to file a new W-4
Common triggers: marriage or divorce, birth or adoption of a child, buying a home (mortgage interest changes deductions), starting or stopping a second job or side gig, big salary changes, or receiving a large refund or bill last year.