No, you do not have to fill out a new Form W-4 every year. The version already on file with your employer keeps controlling your federal income tax withholding until you replace it or a life change requires an update. The one exception is if you claim exemption from withholding; that status expires each year and has to be renewed by February 15.
Why Your Existing W-4 Keeps Working
A completed W-4 has no annual expiration date. Once payroll processes it, your employer applies that withholding for as long as you stay at the job, unless you submit a new one.1Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate Open enrollment doesn’t reset it. A new calendar year doesn’t reset it. The IRS suggests reviewing your withholding annually, but that’s guidance, not a rule you have to follow.
The same is true if your form predates the 2020 redesign. Employees who filled out a W-4 under the old allowances system and never submitted a new one are still covered by that older form. Your employer must continue calculating withholding from it and cannot force you to submit the current version. They can ask, but they have to make clear the request is optional.2Internal Revenue Service. FAQs on the 2020 Form W-4
The Exception: Claiming Exempt Status
If you claim exemption from federal income tax withholding, that claim only lasts through the calendar year you file it in. To keep the exemption going for the next year, you have to give your employer a new W-4 claiming exempt by February 15. When February 15 falls on a weekend or holiday, the deadline moves to the next business day.3Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
You qualify for exemption only if you had no federal income tax liability in the prior year and expect none in the current year.4IRS.gov. Form W-4 (2026) Employee’s Withholding Certificate Miss the February 15 renewal and your employer must start withholding as if you filed as single or married filing separately with no other adjustments. If you eventually turn in a new exempt W-4 after that date, taxes already withheld during the gap won’t come back to you until you file your annual return.
Life Events That Do Require an Update
Even though the calendar doesn’t force a new W-4, certain changes in your life do. The common thread: anything that would change what you’d write on the form.
- Marriage, divorce, or legal separation, because your filing status shifts.5Internal Revenue Service. Filing Status
- Birth or adoption of a child, or a dependent aging out of eligibility, because the child tax credit is worth up to $2,200 per qualifying child under 17 on the 2026 W-4.4IRS.gov. Form W-4 (2026) Employee’s Withholding Certificate
- Starting a second job, or a spouse starting work, because total household wages drive the tables.
- A large raise, a drop in income, or new side income that pushes you into a different bracket.
When the change would increase the tax you owe (a divorce, for example, or losing a dependent), federal regulations give you 10 days from the event to submit a new W-4 to your employer.6eCFR. 26 CFR 31.3402(f)(2)-1 – Furnishing of Withholding Allowance Certificates If the change will only affect next year rather than the current one, the deadline becomes the later of December 1 or 10 days after the change.
Changes that would lower your tax bill, such as getting married or having a child, aren’t on the same mandatory clock. You can update whenever. The reason to move quickly is practical: until you do, your employer keeps withholding at the higher rate, and you won’t see the difference until your refund.
Skipping an update after a change that increased your liability can leave you under-withheld, meaning a balance due at tax time and, potentially, underpayment penalties on top of it.
What If You Never Submitted a W-4
New hires who don’t turn in a W-4 don’t avoid withholding. The employer has to withhold as if the worker filed as single or married filing separately with no entries in steps 2 through 4.3Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate For most people that default takes more out than necessary because it ignores dependents, second-job math, and deductions. Filling out a W-4 when you start prevents the over-withholding from your first check.
When the IRS Forces a Change: Lock-In Letters
The IRS can override your W-4 on its own. If it decides you’re significantly under-withheld, it sends your employer a lock-in letter that specifies the withholding rate to be used.7Internal Revenue Service. Withholding Compliance Questions and Answers Your employer has to implement that rate no sooner than 60 days after the date on the letter, and once it’s in place they cannot lower your withholding even if you submit a new W-4 asking them to.
You get that 60-day window to push back. Send a new W-4 and a written explanation of why a different rate is correct to the IRS address on your copy of the letter, not to your employer.8Internal Revenue Service. Understanding Your Letter 2800C If the IRS agrees, it will tell your employer to adjust. If the lock-in takes effect, you can still ask the Withholding Compliance Unit to modify it later at 855-839-2235 or by fax at 855-202-8300.9Internal Revenue Service. Understanding Your Letter 2801C
Under a lock-in you can always increase withholding. A W-4 that takes more out than the letter requires must be honored. The restriction only blocks attempts to take less.
State Forms Are Separate
Form W-4 handles federal income tax only. If you work in a state that taxes income, you may need a separate state withholding certificate; some states use the federal W-4 for state purposes, but most have their own form. Check with your employer’s payroll office or your state’s tax agency to see which applies to you.