Are Bonuses Included in W-2? Boxes, Withholding, and Corrections

Yes, bonuses are included on your W-2. Employers fold the gross bonus amount into your regular wages rather than listing it on its own line, so a bonus never appears as a separate item on the form. Because the IRS treats bonuses as taxable wages, the money flows into several boxes at once and shapes your federal income, Social Security, and Medicare tax totals.

Which W-2 Boxes Your Bonus Affects

Your bonus lands in the same wage boxes as your salary. Three of them do most of the work:

Box 1 (Wages, tips, other compensation) is the total of your taxable pay for the year, including salary, signing bonuses, prizes, and awards. Bonuses are classified as supplemental wages and roll into this single figure.¹
Box 3 (Social Security wages) shows the portion of your pay subject to Social Security tax. In 2026, only the first $184,500 of combined wages is taxable for that purpose, so if your salary plus bonus tops the cap, Box 3 will be lower than Box 1.²
Box 5 (Medicare wages and tips) has no earnings cap. Your full compensation, bonus included, appears here regardless of amount.³

The corresponding withholding boxes track what came out of your paychecks over the year. Box 2 holds the federal income tax withheld from both salary and bonuses. Box 4 shows the employee share of Social Security tax at 6.2%, which stops once you hit the $184,500 wage cap, even on a bonus paid late in the year. Box 6 shows Medicare tax at 1.45% on all wages, plus an extra 0.9% on any wages above $200,000 for the calendar year.⁴ If you work in a state with an income tax, the bonus is also included in Box 16, with state tax withheld in Box 17.

The types of bonuses swept into these totals cover just about every form of extra pay: signing bonuses, performance bonuses, holiday cash, and non-cash rewards like electronics or vacation packages. Non-cash bonuses are reported at fair market value — the price you would pay a third party for the item — and your employer determines that value and adds it to Box 1.⁵ The tax treatment is the same whether you get a separate bonus check or the money is baked into a regular paycheck.

How Federal Tax Gets Withheld From a Bonus

Because bonuses are supplemental wages, employers can pick between two withholding methods, and the choice explains why a bonus check often looks smaller than you expected.

Flat-Rate Method

The most common approach is a flat 22% federal income tax withholding on the bonus. Your employer ignores your W-4 and regular wages under this method and simply takes 22% off the top. If your total supplemental wages for the year exceed $1 million, the amount above $1 million is withheld at 37%, the highest individual rate.⁶

Aggregate Method

Under the aggregate method, the employer temporarily combines your bonus with your most recent regular paycheck, figures the tax as if the total were a single payment for one pay period, and then subtracts the tax already withheld from that regular pay. What remains comes out of the bonus.⁶ The result can look like a very steep tax rate on the bonus, but the calculation is just projecting your regular pay plus the bonus across the full year to estimate withholding.

Whichever method your employer uses, the number is only an estimate. Your actual tax on the bonus is settled when you file your return.

Retirement Contributions From a Bonus

If you route part of your bonus into a workplace retirement plan, that amount appears in Box 12 with a letter code identifying the plan. Traditional 401(k) deferrals use Code D, 403(b) deferrals use Code E, and governmental 457(b) deferrals use Code G. Designated Roth contributions to a 401(k) use Code AA, and Roth 403(b) contributions use Code BB.⁷

Traditional pre-tax deferrals reduce your Box 1 wages but still count as Social Security and Medicare wages in Boxes 3 and 5. Roth contributions are included in all three boxes because you pay tax on them now in exchange for tax-free withdrawals later.

Which Year Your Bonus Counts For

A bonus goes on the W-2 for the year it is paid, not the year you earned it. Hit a performance target in December 2025 and receive the payout in January 2026, and it lands on your 2026 W-2.¹ That timing affects your bracket, deduction phase-outs, and credit eligibility for the year of payment.

The IRS applies a rule called constructive receipt: income counts in the year you could have accessed it, even if you left it sitting. If your employer controls when the money is released, though — say, a bonus that does not vest until a future date — you have not received it until the restriction lifts. A deferred bonus that cannot be withdrawn until a plan matures is taxable in the year it actually becomes available.⁸

What Doesn’t Show Up on the W-2

Some workplace extras stay off the form. Small tokens of appreciation can be excluded under the de minimis fringe benefit rule when their value is low enough that tracking them would be impractical, such as a holiday turkey, occasional snacks, or a company-branded gift basket.⁹

Cash and cash equivalents never qualify for that exclusion, no matter how small the amount. A $25 gift card or a small cash holiday tip has to be included in W-2 wages, and gift certificates redeemable for general merchandise are treated the same as cash.⁹

Reimbursements for legitimate business expenses under an accountable plan, where you document the expense and return any excess, are also excluded. They are not bonuses; they are repayments for costs you fronted on the employer’s behalf.¹

When 22% Withholding Isn’t Enough

The flat 22% is only an estimate, and it can leave you short at tax time. If your total income puts you in the 24%, 32%, or higher bracket, 22% withheld on a bonus will not cover the actual tax on that money, and you will owe the gap on your return.

Two ways to close it:

Adjust your W-4. Step 4(c) lets you request additional withholding from each paycheck, and the IRS specifically recommends running its online Tax Withholding Estimator if you receive bonuses.¹⁰
Make an estimated tax payment. Send a quarterly payment directly to the IRS on Form 1040-ES to cover the difference.

One more wrinkle on Medicare tax: the Additional Medicare Tax threshold for filers is $250,000 for married filing jointly, $125,000 for married filing separately, and $200,000 for single filers and heads of household. Your employer withholds the extra 0.9% based only on the $200,000 threshold regardless of your filing status, so you may owe more or receive a credit when you file.⁴

Fixing a W-2 That’s Missing or Wrong on a Bonus

If your bonus is missing from your W-2 or the amount looks wrong, contact your employer’s payroll department first. The employer is responsible for filing a corrected Form W-2c with the Social Security Administration and giving you the updated copy.¹¹ If payroll does not respond or refuses to fix the error, contact the IRS directly for help. Do not file a return with numbers you know to be wrong; wait for the corrected form or file using figures you can verify from your pay records.

1
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3
2
Social Security Administration. Social Security Tax Limits on Your Earnings
3
Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
4
Internal Revenue Service. Topic No. 560, Additional Medicare Tax
5
Internal Revenue Service. Publication 15-B (2026), Employers Tax Guide to Fringe Benefits
6
Internal Revenue Service. Publication 15 (2026), (Circular E), Employers Tax Guide
7
Internal Revenue Service. Common Errors on Form W-2 Codes for Retirement Plans
8
eCFR. 26 CFR 1.451-2 – Constructive Receipt of Income
9
Internal Revenue Service. De Minimis Fringe Benefits
10
Internal Revenue Service. Form W-4 (2026)
11
Internal Revenue Service. About Form W-2c, Corrected Wage and Tax Statements