Claiming exempt on a bonus check stops your employer from withholding federal income tax on that payment, but the bonus is still fully taxable — so unless you genuinely owed no federal income tax last year and expect to owe none this year, you will owe the money at filing time, and you risk a $500 civil penalty, criminal charges, or both for submitting a false W-4.
Who Actually Qualifies to Claim Exempt
Federal law sets a strict two-part test under Section 3402(n) of the Internal Revenue Code, and you must meet both parts.{1Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source}
- Your total federal income tax for the prior year was zero, or it was fully offset by refundable credits. Getting a refund because your employer over-withheld does not count. Your actual liability has to be zero.
- You reasonably expect your federal income tax for the current year to also be zero after deductions and credits.
The IRS regulation clarifies “no liability” to mean your income tax is equal to or less than your allowable credits, not counting withholding credits and certain fuel credits.{2eCFR. 26 CFR 31.3402(n)-1 – Employees Incurring No Income Tax Liability} Someone who got a $356 refund but had $839 in actual tax liability, for example, does not qualify.
Most employees earning bonuses large enough to worry about withholding will fail this test. If your regular wages alone put you in a taxable bracket, adding a bonus on top all but guarantees you will owe federal income tax for the year — which means claiming exempt is not legally available to you.
What Actually Changes on the Check
If you submit a W-4 claiming exempt and your employer processes it before paying the bonus, they stop withholding federal income tax on that check. On a $10,000 bonus, that means keeping roughly $2,200 that would otherwise be sent to the IRS under the flat 22% supplemental wage withholding rate.{3Internal Revenue Service. Publication 15 (2026), (Circular E), Employers Tax Guide}
Exempt status does not stop other payroll deductions. Your employer must still withhold Social Security tax at 6.2% on wages up to the annual cap of $184,500, and Medicare tax at 1.45% on all wages.{4Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates}{5Social Security Administration. Contribution and Benefit Base} Wages over $200,000 in a year pick up an additional 0.9% Medicare tax. State and local income taxes may continue to apply depending on where you work. Exempt is a narrow lever, and it moves only federal income tax withholding.
One more limit: if your total supplemental wages from one employer exceed $1 million in a calendar year, every dollar above $1 million is withheld at a mandatory 37%, regardless of what your W-4 says.{3Internal Revenue Service. Publication 15 (2026), (Circular E), Employers Tax Guide}
Timing Traps for the W-4
Your employer is not required to process a new W-4 the moment you submit it. Under IRS rules, they must implement a revised W-4 no later than the start of the first payroll period ending on or after the 30th day after receiving it.{6Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate} Turning in a new W-4 the day before payday may not affect that check at all.
A W-4 claiming exempt also expires. To keep exempt status into the next year, you have to submit a new W-4 by February 15 (or the next business day). The 2026 form specifies February 16, 2027, as the renewal deadline.{7Internal Revenue Service. Form W-4, Employees Withholding Certificate (2026)} If you miss it, your employer switches to withholding as if you filed a W-4 with no adjustments, which is usually higher than what you had before.
Penalties for a False Exempt Claim
If you claim exempt without meeting both parts of the eligibility test, the IRS has two separate penalty tracks.
The $500 Civil Penalty
Under 26 U.S.C. § 6682, a withholding statement that has no reasonable basis and produces too little withholding can trigger a $500 penalty per false statement.{8Office of the Law Revision Counsel. 26 USC 6682 – False Information With Respect to Withholding} This sits on top of the taxes, interest, and any other penalties you owe. The IRS does not have to prove you acted intentionally. It only has to show the claim had no reasonable basis.
Criminal Charges
For willful violations, 26 U.S.C. § 7205 allows a fine of up to $1,000, up to one year in prison, or both, on top of any other penalties.{9Office of the Law Revision Counsel. 26 USC 7205 – Fraudulent Withholding Exemption Certificate or Failure to Supply Information} The willfulness standard is a higher bar than the civil penalty. Criminal prosecution for isolated W-4 misstatements is uncommon in practice, but the statute is on the books.
Lock-In Letters
Beyond penalties, the IRS can override your W-4 outright. If it determines your withholding is too low, it sends your employer a “lock-in letter” telling them what withholding arrangement to use.{10Internal Revenue Service. Withholding Compliance Questions and Answers} Once the employer receives it, they must ignore any new W-4 you submit that would drop your withholding below the specified level. You cannot undo a lock-in letter by turning in another W-4. You need direct IRS approval. The IRS spots this kind of noncompliance by comparing employer-reported withholding against your historical filings, and patterns like flipping to exempt right before a large bonus can trigger review.
The Tax Still Comes Due
Skipping withholding does not erase the tax. When you file your Form 1040, the bonus is added to your other income to compute your total liability. If your regular-paycheck withholding did not cover the full year’s tax, you owe the difference at filing. For someone in the 22% bracket, un-withheld tax on a $10,000 bonus is roughly $2,200. In the 24% bracket, about $2,400. The full balance is due by the April filing deadline, and any amount still unpaid after that accrues interest and late-payment penalties.
Underpayment Penalty and Safe Harbors
Even before filing, you may owe an underpayment penalty. The IRS charges interest on underpaid taxes at a rate that adjusts quarterly. For the first quarter of 2026, that rate is 7%.{11Internal Revenue Service. Quarterly Interest Rates} You generally avoid the penalty if your total withholding plus estimated tax payments meets one of these thresholds:
- At least 90% of your current-year tax.
- At least 100% of last year’s total tax (110% if your prior-year adjusted gross income exceeded $150,000, or $75,000 if married filing separately).{}12Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
- A balance under $1,000 after subtracting withholding and credits.
If a mid-year bonus leaves you short, you can make estimated payments with Form 1040-ES. The penalty is figured separately for each quarterly installment period, so catching up in Q4 does not erase the shortfall from earlier quarters.{13Internal Revenue Service. Instructions for Form 2210}
The short-term cash on a bonus check rarely covers what claiming exempt actually costs: the tax you still owe at filing, quarterly interest on the shortfall, a possible underpayment penalty, and a $500 civil penalty if the IRS decides the claim had no reasonable basis. If you legitimately meet the two-part test, exempt is available. If you do not, the more useful lever is adjusting your regular W-4 or making an estimated payment to cover the extra tax the bonus generates.