✓ Updated for 2025–2026

Fill out your W-4 the easy way

Answer a few simple questions. We'll tell you exactly what to write on every line of your IRS W-4 form — in plain English, in under 2 minutes.

Start the W-4 Tool →

By the Easy Guides Editorial Team

W-4 Extra Withholding Helper

The modern W-4 has no allowances. The simplest way to fine-tune your refund or avoid owing is line 4(c), extra withholding. Tell us how much more you want withheld this year and how you are paid, and we will give you the exact per-paycheck number to write on line 4(c).

Extra tax to withhold this year

A good starting point is what you owed last April. To aim for a refund, add the refund you want.

How often are you paid?

Paychecks left this year (optional)

Fewer paychecks left means a larger amount per check to reach the same total.

How to fill out each W-4 line Two jobs or a working spouse

Educational federal estimate, not tax advice. This sets extra withholding only; it does not compute your full tax. For a complete projection use the IRS Tax Withholding Estimator, then enter the suggested extra here.

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Under 2 minutes

Quick questions in plain English — no tax jargon.

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Mobile-first

Built for your phone. Fill out your W-4 from anywhere.

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Private

Nothing you enter is saved, tracked, or sent anywhere.

What the W-4 actually does

Your IRS Form W-4 tells your employer how much federal income tax to withhold from every paycheck. Fill it out well and your withholding matches what you actually owe — meaning no surprise bill in April and no giant interest-free loan to the government.

Since 2020, the W-4 no longer uses allowance numbers (0, 1, 2...). Instead, it asks for dollar amounts: how much you earn from other jobs, how many dependents you have, and whether you want any extra withheld. The new form is more accurate — but the instructions are famously confusing. That is why this site exists.

Quick answers to common W-4 questions

A W-4 is the IRS form you give your employer to tell them how much federal income tax to withhold from your paycheck. Fill it out well and your tax bill in April should be close to zero.

The modern W-4 no longer uses allowance numbers. But the concept still applies: leaving Step 3 blank maximizes withholding (like claiming 0). Adding dependents in Step 3 reduces withholding (like claiming 1 or more). Our tool walks you through exactly what to enter.

Update your W-4 whenever your tax situation changes — new job, marriage, divorce, new baby, major income change, or side hustle. You can submit a new W-4 to your employer at any time.

Too little withheld means you owe money in April and may face a penalty. Too much withheld means a refund but you gave the IRS an interest-free loan. Our tool aims for just right.

See all FAQ →

Who needs to fill out a W-4?

You fill out a W-4 whenever you start a new job as an employee. You may also need to update it when your life or finances change. Common situations:

Starting a new job — your employer is required to have a W-4 on file
Getting married or divorced — changes your filing status and optimal withholding
Having a baby or adopting — new dependents reduce your tax liability
Taking on a second job or side hustle — additional income requires additional withholding
Major income change — raise, demotion, or switching from salary to hourly
Large tax bill or big refund last year — a signal your W-4 needs adjusting

Independent contractors do not fill out a W-4 — they fill out a W-9 instead. If you're unsure which applies to you, see our W-4 vs W-9 guide.