How to Fill Out Form W-4 in 2026: Step-by-Step Guide

IRS Form W-4 (Employee's Withholding Certificate) determines exactly how much federal income tax your employer withholds from each paycheck. An accurate W-4 ensures you neither owe a large sum to the IRS at tax time nor provide the government with an interest-free loan.

Step 1: Enter Personal Information

Fill out your name, address, Social Security Number, and filing status (Single, Married Filing Jointly, or Head of Household). Your filing status sets your standard deduction baseline for withholdings.

Step 2: Multiple Jobs or Spouse Works

If you hold more than one job at a time or are married filing jointly and both spouses work, you must account for this to prevent under-withholding. You can use the IRS Tax Withholding Estimator or check box 2(c) if both jobs pay similar wages.

Step 3: Claim Dependents

If your total income is under $200,000 ($400,000 for joint filers), multiply the number of qualifying children under age 17 by $2,000 and other dependents by $500. This directly reduces your annual paycheck withholding.

Step 4: Other Adjustments

• 4(a) Other Income: Interest, dividends, or retirement income not subject to withholding.
• 4(b) Deductions: If you itemize deductions rather than taking the standard deduction.
• 4(c) Extra Withholding: Specific dollar amount you wish withheld from each paycheck.