When Is a W-4 Due? New Hires, 10-Day Rule, and Exempt Status

A W-4 is due before your first paycheck at a new job, within 10 days of certain life changes that reduce the withholding you’re entitled to claim, and by February 15 each year if you want to keep claiming exempt status.¹ Outside those triggers, there is no annual filing requirement — the form stays in effect until you replace it.

Before Your First Paycheck at a New Job

Federal law requires you to give your employer a signed W-4 on or before the day you start work.² Your employer uses it to calculate federal income tax withholding starting with your very first check.³ There is no fixed calendar date; the deadline tracks your start date.

If nothing is on file when payroll runs, your employer must withhold as if you are single with no other adjustments — no dependents, no deductions, no multiple-job entries.⁴ For most workers, that default takes out more than necessary. You can turn in a form at any point after that, but the overwithheld amount only comes back when you file your annual return.

Within 10 Days of a Change That Lowers Your Allowed Withholding

Some life and financial changes reduce the withholding adjustments you can legitimately claim. When one of them happens and your current withholding will no longer cover your remaining tax bill for the year, you have 10 days to give your employer a new W-4.⁵ The clock starts on the date of the change, not when you notice it on a pay stub. The triggering events are:

Your filing status drops from married filing jointly or qualifying surviving spouse to head of household, single, or married filing separately, or from head of household to single or married filing separately.
You or your spouse start an additional job, and you previously used the Multiple Jobs Worksheet or the IRS Tax Withholding Estimator to set your withholding.
You or your spouse expect a raise of more than $10,000 in regular wages at a second or third job, and the Step 2(c) checkbox is not selected.
You no longer expect to claim a child tax credit you included on a prior W-4.
Other credits you claimed on a previous W-4 drop by more than $500.
Your deductions drop by more than $2,300 from the amount on your current W-4.
You no longer reasonably expect to qualify for exempt status.

If the change happens but your current withholding will still cover your tax liability for the rest of the year, the 10-day rule doesn’t apply, though you can still update voluntarily.⁵

One variation applies to filing status changes that cross into a new year. If your filing status changes during 2025 in a way that affects 2026 withholding — say, a divorce finalized in November — you must give your employer a new W-4 for the next year by December 1 or within 10 days of the change, whichever is later.⁵

Voluntary Updates Have No Deadline

When a change works in your favor and would reduce your withholding or increase your take-home pay, you can submit a new W-4 whenever you want. There is no deadline.⁵ Common reasons to file a voluntary update include:

Getting married and switching to married filing jointly
Having or adopting a child who qualifies for the child tax credit
Buying a home and taking on a new mortgage interest deduction
Wanting a larger refund at tax time by increasing withholding
Wanting a larger paycheck now by decreasing withholding, as long as you’ll still cover your tax bill

February 15 for Exempt Status

A claim of full exemption from federal income tax withholding expires at the end of each calendar year. To keep it in place for the new year, you must submit a fresh W-4 claiming exempt by February 15.¹ When February 15 falls on a weekend or legal holiday, the deadline moves to the next business day.

To qualify for exempt status in 2026, you must have had zero federal income tax liability in 2025 and expect zero in 2026.⁶ You had no liability in 2025 if line 24 of your Form 1040 was zero (or less than your refundable credits), or if your income was below the filing threshold for your filing status.

Miss February 15, and your employer must immediately start withholding as if you are single or married filing separately with no other adjustments.¹ You can still file a new exempt W-4 later, and your employer will apply it going forward, but any taxes withheld during the gap won’t come back through payroll. You recover them when you file your annual return.

When Your Employer Actually Applies the New Form

Turning in a new W-4 doesn’t always change your next paycheck. The IRS gives employers until the start of the first payroll period that ends on or after the 30th day after they receive your revised form.¹ A delay of one to two pay cycles is normal. On a biweekly schedule, the change may not show up for up to six weeks.

You submit the form only to your employer, not to the IRS.⁷ Many payroll departments accept electronic submission through an online portal; a paper copy also works.

Keep in mind that the W-4 only controls federal income tax withholding. Social Security, Medicare, and Additional Medicare taxes come out at fixed rates no matter what your W-4 says.⁸ Most states with an income tax use a separate state form; only a handful accept the federal W-4 for state purposes.

What Happens If You Get the Timing Wrong

Skipping a required update or filing a W-4 that understates your withholding can cost money. If you claim adjustments you aren’t entitled to without a reasonable basis, the IRS can impose a $500 civil penalty on top of any tax you still owe.⁹

Willfully providing fraudulent information, or deliberately failing to report changes that would increase your withholding, is a federal crime. A conviction can bring a fine of up to $1,000, up to one year in prison, or both.¹⁰

Even without any intent to mislead, chronic under-withholding can trigger an underpayment penalty at tax time. You generally avoid that penalty if your withholding and estimated payments cover at least 90 percent of your current year’s tax, or 100 percent of last year’s tax — 110 percent if your adjusted gross income exceeded $150,000.¹¹

1
Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
2
Office of the Law Revision Counsel. 26 U.S. Code 3402 – Income Tax Collected at Source
3
Internal Revenue Service. Hiring Employees
4
Internal Revenue Service. Withholding Compliance Questions and Answers
5
Internal Revenue Service. Publication 505 (2025), Tax Withholding and Estimated Tax
6
Internal Revenue Service. Form W-4 2026 Employee’s Withholding Certificate
7
Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate
8
Internal Revenue Service. Understanding Employment Taxes
9
Office of the Law Revision Counsel. 26 U.S. Code 6682 – False Information With Respect to Withholding
10
Office of the Law Revision Counsel. 26 U.S. Code 7205 – Fraudulent Withholding Exemption Certificate or Failure to Supply Information
11
Internal Revenue Service. Estimated Tax