How to Fill Out Your W-4 in 2025

The W-4 (Employee’s Withholding Certificate) tells your employer how much federal income tax to withhold from your paycheck. Getting it right means no surprise tax bill — and no overpaying throughout the year.

The 2020+ Redesigned W-4

The IRS redesigned the W-4 in 2020, eliminating the old “allowances” system. The new form is more accurate but initially confusing. Here is what each step does.

Step-by-Step W-4 Guide

Step 1: Personal Information (Required)

Fill in your name, address, SSN, and filing status:

• Single or Married filing separately
• Married filing jointly or Qualifying surviving spouse
• Head of household

Your filing status on the W-4 determines your withholding tables. Choosing “Married filing jointly” withholds less than “Single” at the same income.

Step 2: Multiple Jobs or Spouse Works (Optional)

Complete this step if:

• You have more than one job simultaneously, OR
• You are married filing jointly and your spouse also works

Options:

• Option A: Use the IRS online estimator at IRS.gov/W4app
• Option B: Use the Multiple Jobs Worksheet (page 3 of W-4)
• Option C: Check box 2(c) if you have exactly two jobs at similar pay

If you skip Step 2 with multiple jobs, each employer will withhold as if your job is your only income — which can lead to under-withholding and a tax bill at filing.

Step 3: Claim Dependent Credits (Optional)

Multiply the number of qualifying children under 17 by $2,000, then add $500 for each other qualifying dependent.

Situation	Enter in Step 3
2 children under 17	$4,000
1 child + 1 elderly parent dependent	$2,500
No dependents	$0 (leave blank)

Step 4: Other Adjustments (Optional)

4(a) — Other income: If you have non-job income (freelance, interest, dividends) not subject to withholding, add that amount. Your employer will withhold extra to cover it.

4(b) — Deductions: If you plan to itemize or take above-the-line deductions beyond the standard deduction, use the Deductions Worksheet to reduce withholding.

4(c) — Extra withholding: Enter any additional amount per pay period you want withheld. Useful if you owe taxes each year or receive a bonus that will not have enough withheld.

Step 5: Sign and Date (Required)

Your employer cannot process the form without your signature.

How to Know If You Are Withholding the Right Amount

The IRS Tax Withholding Estimator (IRS.gov/W4app) is the best tool. Generally:

Signs you are under-withholding:

• You owe taxes every year at filing
• You have multiple jobs or a working spouse
• You have significant non-wage income
• You did not complete Step 2 with multiple jobs

Signs you are over-withholding:

• You consistently get a large refund ($2,000+)
• You have no dependents but claimed them anyway
• Your circumstances changed (child grew up, got divorced)

Avoiding Underpayment Penalties

The IRS charges an underpayment penalty if you owe more than $1,000 at tax time. The safe harbor rules let you avoid penalties if you:

1. Paid 90% of this year’s tax liability, OR
2. Paid 100% of last year’s total tax (110% if AGI was over $150,000)

Example: If you paid $18,000 in tax last year, you need at least $18,000 withheld (or paid via estimates) this year to avoid the penalty — regardless of what you owe.

Life Events That Require a New W-4

Life Event	Action Needed
Marriage	Update filing status; consider both spouses’ incomes
Divorce	Update filing status to single/HOH
New child	Add dependent in Step 3
Second job	Complete Step 2
Significant raise/bonus	Check withholding with estimator
Side business income	Add to Step 4(a)
Spouse stops/starts working	Redo Step 2

State Withholding Form

Most states have a separate withholding form (equivalent to W-4) for state income tax. Common names: DE-4 (California), IT-2104 (New York), W-4 MN (Minnesota). Submit both federal and state forms to your employer.

Use our Paycheck Calculator to verify your expected take-home after withholding.

See Also

• Federal income tax brackets 2025
• Standard deduction 2025
• How to reduce taxable income
• Child tax credit 2025