How to Fill Out Your W-4 in 2026 (Step-by-Step)

What the W-4 actually does

When you start a job (or want to change your withholding), you submit IRS Form W-4 to your employer’s payroll department. Your employer uses it to calculate how much federal income tax to withhold from each paycheck. The form was redesigned in 2020 — the old "allowances" system is gone. The new version directly asks for dollar amounts and checkbox-style elections, which makes it more accurate but also requires more information.

The goal is to withhold roughly the right amount — close enough that you neither owe a large balance nor receive a large refund. A large refund means you gave the government an interest-free loan all year. A large balance due can result in an underpayment penalty.

Step 1: Personal Information

Enter your name, address, Social Security Number, and filing status. There are three filing status options on the W-4:

• Single or Married Filing Separately — Results in the highest withholding. Choose this if you are unmarried, or if you are married but file separately.
• Married Filing Jointly or Qualifying Surviving Spouse — Lower withholding than Single. Only choose this if you are married and plan to file jointly, AND if you or your spouse don’t have other jobs.
• Head of Household — For unmarried individuals who pay more than half the cost of keeping a home for a qualifying person (such as a child). Lower withholding than Single, higher than MFJ.

Important: If you are married and both spouses work, do NOT choose Married Filing Jointly here unless you complete Step 2. Choosing MFJ without completing Step 2 will result in under-withholding because both spouses’ incomes are stacked into higher brackets when combined on a joint return.

Step 2: Multiple Jobs or Spouse Works

Only complete this step if you have more than one job or your spouse works. Skipping it when it applies is the most common W-4 mistake.

You have three options for Step 2:

• Option (a) — IRS Tax Withholding Estimator: The most accurate method. Visit the IRS Tax Withholding Estimator at irs.gov and enter your combined household income. It will tell you exactly how to fill out the form.
• Option (b) — Multiple Jobs Worksheet (Page 3): A built-in worksheet on the back of the form. You fill it out separately from each job’s W-4. Moderately accurate.
• Option (c) — Check the Box: The simplest option. Simply check the box in Step 2(c). This tells your employer to withhold at the Single rate, which is the highest standard rate. You may slightly over-withhold, but you won’t under-withhold.

For most dual-income couples, checking the box in Step 2(c) on both spouses’ W-4s is the simplest path to adequate withholding. The IRS Estimator is more precise if you want to avoid over-withholding.

Step 3: Claim Dependents

This step is optional and reduces your withholding by accounting for the Child Tax Credit and Credit for Other Dependents. Only complete this step on the W-4 for your highest-paying job.

• Children under 17: Multiply the number of qualifying children by $2,200. (The Child Tax Credit is $2,000 per child, but the W-4 uses $2,200 to allow for phase-out adjustments.)
• Other dependents (parents, adult children, etc.): Multiply by $500.
• Add the two numbers together and enter the total in Step 3.

This reduces your withholding — your paycheck will be slightly larger each period. But it also means you’re prepaying less tax, so make sure you’re actually eligible for these credits before claiming them.

Step 4: Other Adjustments (Optional)

When to submit a new W-4

You should submit a new W-4 any time your tax situation changes materially. Common triggers:

• You got married or divorced
• You had or adopted a child
• Your spouse started or stopped working
• You took on a second job or quit a second job
• You started significant freelance or gig work
• You received a large raise or pay cut
• You received a very large refund (over-withholding) or balance due (under-withholding) last year
• You moved to a state with different income tax

There is no penalty for submitting a new W-4, and you can submit one at any time during the year — not just when you start a job. Talk to your payroll department or HR team about their process.