Why wasn't any federal income tax withheld from my paycheck?

Last updated: September 8, 2026

Applies to: US W-2 employees. In most cases, independent contractors have nothing withheld from their payments, whereas Canadian T4 employees have a different set of deductions. Not sure which you are? See Am I a W-2 employee or a 1099 independent contractor? (US).

Summary: If the federal income tax line on your pay stub is zero, or much smaller than you expected, it is almost always what your own Form W-4 tells us to do rather than a payroll error. The most common cause is a figure entered in Step 3 of the W-4, Claim Dependents and Other Credits. You can check your W-4, correct it yourself, and the new figures apply to your next paycheck.

Start with your W-4, not the paycheck

Your Form W-4 is what tells us how much federal income tax to take out of each payment. Two of its steps can reduce that amount all the way to nothing:

  • Step 3 — Claim Dependents and Other Credits. Whatever you enter here is treated as tax you have already covered, so it is spread across the year and subtracted from what is withheld. A large figure here — credits claimed that do not apply, or simply a digit too many — can take your federal withholding to zero on an otherwise normal paycheck.

  • Claiming exempt. The W-4 lets you declare that you expect to owe no federal income tax for the year. If that was declared on your form, no federal income tax is withheld at all.

In both cases nothing is wrong with the paycheck — the platform is doing exactly what the form says.

Other reasons the line can be zero

  • A small amount of pay in that period. Federal withholding is worked out from your pay for the period and your W-4 settings together, so a short week can come out at or near zero even when your form is set up normally.

  • Federal income tax is only one of the lines. Social Security and Medicare (FICA) are set by federal law and are not something you elect on the W-4, so you will normally still see those coming out even when federal income tax does not. See Understanding the taxes withheld from your paycheck.

Why this matters

A zero on that line does not mean the income is untaxed. It means less was collected during the year, so more may be due when you file your annual return. The sooner you notice it, the fewer paychecks are affected — which is why it is worth checking rather than leaving it.

How to check what your W-4 actually says

  1. Log in at app.ascen.com and open your Paychecks page to see the tax lines on the stub you are asking about.

  2. Your signed federal W-4 is saved in your account as a document — download it and look at what was actually entered, starting with Step 3. If you cannot find it, email support@ascen.com and we will send you a copy of the form we hold.

How to correct it

Updating your W-4 is self-service. Go to your Paychecks page, click Update Withholdings in the upper right, then re-enter and re-sign. Full steps are in How do I fill out my US tax forms (W-4)?.

Finish it in one sitting. Starting the update reopens the withholding step as an outstanding item on your account, and an outstanding step can hold up other parts of your profile — including entering your time — until it is completed and signed.

When the change takes effect

A corrected W-4 applies going forward, to paychecks processed after you finish it — normally from the next payroll. It does not change a paycheck that has already been issued, and if your update lands after payroll has begun processing for the week, it is picked up on the following cycle. The same is true of a state withholding form.

Your year-end W-2 will show what was actually withheld across the whole year.

We cannot tell you what to put on it

We can show you what is on your W-4 and help you generate a corrected form, but we cannot give you individual tax advice or tell you which figures are right for your situation. Use the IRS Tax Withholding Estimator before you re-enter your numbers, or speak to a qualified tax professional.

Official reference: About Form W-4 (IRS)

This article is general information, not individual tax advice.