How often should I review my W-4?

Minimum: annually in January. Also review after any major life change: marriage, divorce, new baby, new job, starting freelancing, significant investment income change, or large refund/balance at prior filing.

What is the most important W-4 check every January?

Review your prior year’s refund or balance due. If the refund exceeded $2,000: identify over-withholding and correct. If you owed more than $500: identify under-withholding and correct. This single check catches most withholding issues before they repeat.

My child turned 17 this year — do I need to update my W-4?

Yes — remove $2,000 from Step 3 for the child who turned 17. The Child Tax Credit ($2,000) applies only to children under 17 at year end. A child who turns 17 during 2025 is not eligible for the $2,000 credit; they may qualify for the $500 Other Dependent Credit if claimed as a dependent.

How do I run the IRS Tax Withholding Estimator?

Go to irs.gov/W4app. Enter your filing status, estimated 2025 income from all sources, expected deductions, and dependents. The estimator shows your projected refund or balance due and recommends specific W-4 changes. The process takes 10–15 minutes for most employees.

What do I do if my employer doesn’t have my current W-4?

Submit a new W-4 to your payroll department. You can print a blank W-4 from irs.gov/w4, complete it, and submit. Your employer must implement it within one payroll period. Your current employer should always have the most recent W-4 you’ve submitted.

W-4 Annual Review Checklist: 10 Things to Verify Every January

January is the optimal time for a W-4 review — you have the prior year’s result in hand and 12 full months of paychecks ahead to benefit from any correction. This 10-item checklist takes 30 minutes and catches the most common withholding errors before they cost you money all year.

The January W-4 Review Checklist

💡When to Run This Checklist

January is ideal — before the first paycheck of the year. Also run within 30 days of any major life change (marriage, divorce, baby, new job, starting freelancing, major income change). Setting a recurring January calendar reminder ensures this never gets skipped.

January W-4 review checklist — 10 items, approximately 30 minutes

Item	Check	Action If Wrong
1. Filing status is current	Matches your expected 2025 filing status	Submit new W-4 with updated status
2. Step 2 checkbox is correct	Checked only if two+ jobs or working spouse	Uncheck if situation changed; check if new situation applies
3. Step 3 dependents are current	$2,000 per qualifying child under 17 this year	Add children born in 2024; remove children now 17+
4. Step 4a reflects all non-W-2 income	Expected investment, rental, freelance income for 2025	Update with current year’s expected income
5. Step 4b reflects current deduction plan	Excess itemized deductions above standard deduction	Update if mortgage payoff, charitable change, etc.
6. Step 4c matches your current needs	Extra withholding still needed/accurate	Remove if life change eliminated the need; adjust amount if needed
7. Prior year result was acceptable	Refund under $2,000 or balance due under $500	If not: identify cause and fix corresponding W-4 step
8. Employer has your current W-4	Last submission reflects your current situation	Submit new W-4 if your situation changed last year
9. IRS estimator result is satisfactory	Run irs.gov/W4app with 2025 expected info	Implement any W-4 changes recommended by estimator
10. You’re prepared for any 2025 income changes	Anticipated raises, bonuses, side income, investment plans	Pre-adjust Step 4c if known large income changes are coming

The most valuable items to check annually: prior year result (#7), filing status (#1), and dependents (#3). Filing status changes (marriage, divorce) are the most commonly missed. Dependents change as children age — a child who turns 17 in 2025 no longer qualifies for the $2,000 credit, requiring a W-4 update that removes $2,000 from Step 3.

Verify Your Current W-4 Settings

Run your current W-4 settings through the calculator to confirm your 2025 withholding will be accurate.

Open W-4 Calculator Calculator →

W-4 Annual Review Checklist: 10 Things to Verify Every January

The January W-4 Review Checklist

Frequently Asked Questions

Frequently Asked Questions

More W-4 Calculator Guides

How to Use a W-4 Calculator: Complete 2025 Guide

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