Your Year-End Bonus Wasn't Taxed at 35 Percent. Here's Why

Renee got her holiday bonus on December 12 last year: $4,000, the biggest single line her employer had ever paid her. When the deposit cleared two days later, it was $2,614. She stared at the number, did some quick math in her head, and figured the government had just taken almost 35 percent of her bonus in one bite.

She wasn't taxed at 35 percent, though. She was withheld at 35 percent, and most of that gap was never income tax at all. Some of it is coming back to her.

The difference between those two words, taxed and withheld, is the whole reason bonus checks look so brutal when they land. Once you see how it works, you can predict almost to the dollar what your own year-end bonus will really cost you, and in plenty of cases claw some of it back.

Withholding is a deposit, not the final bill

The money your employer pulls out of every paycheck all year is an estimate. The IRS asks employers to withhold roughly what it thinks you'll owe, and then the real number gets settled exactly once, on the tax return you file the following spring. Withhold too much across the year and you get a refund. Withhold too little and you write a check in April.

A bonus is ordinary income. It lands in Box 1 of your W-2 the same way your salary does, and it doesn't carry a special tax rate of its own. What it carries is a special withholding rate, and that is where the sticker shock comes from.

Why your employer took 22 percent off the top

The IRS files a bonus under "supplemental wages," a bucket that also holds commissions, overtime, severance, prizes, and back pay, spelled out in Publication 15, the Employer's Tax Guide. For supplemental wages, an employer is allowed to skip the regular withholding tables and apply one flat federal rate: 22 percent. Past $1 million of supplemental pay in a single calendar year, the rate on the amount above $1 million jumps to 37 percent. Both figures held for 2026, because the 2025 tax law (Public Law 119-21) made the underlying individual rates permanent.

That 22 percent has nothing to do with your tax bracket. It's a single national rate, picked because it's simple for a payroll system to apply the same way to a warehouse worker in Ohio and an attorney in Manhattan. If you happen to sit in the 22 percent bracket, it lands about right. If you don't, it's either too much or too little, and you square up the difference in the spring.

The federal 22 percent is only the first slice, though. Renee's $4,000 also had Social Security tax (6.2 percent, or $248), Medicare tax (1.45 percent, or $58), and her state's income tax (about 5 percent, or $200) taken out on top. Add it up: $880 federal, $306 for Social Security and Medicare, $200 for the state. That comes to $1,386, which is why $2,614 hit her account. Almost 35 percent gone, and only 22 of those points were federal income tax withholding.

The other way employers do it, and why some checks lose even more

Employers get a second option, and it explains the people who swear their bonus lost 40 percent.

Instead of the clean flat 22 percent, an employer can lump your bonus onto a regular paycheck and run the combined amount through the normal withholding tables tied to your W-4. This is the aggregate method. The tables assume every paycheck repeats for the whole year, so a fat one-time check looks, for a moment, like you suddenly started earning far more than you do. The software reacts by withholding at a higher rate to match that imaginary salary.

That's how a bonus can shed 30, 35, even 40 percent before it reaches you. It feels like a penalty aimed at bonuses. It's really just a math artifact of a system built for steady paychecks, and like the flat 22 percent, any over-withholding it creates comes back to you at tax time.

You usually can't pick which method your employer uses, but you can tell which one they used. Look at the pay stub for the period your bonus hit. A clean 22 percent on the federal line points to the percentage method. A bigger federal number with no obvious round percentage usually means the aggregate method annualized your check.

So did you overpay, or underpay?

This is where you find out whether a refund is quietly building or a bill is coming.

The flat 22 percent is a good guess only for people who are really in the 22 percent bracket. For 2026, a single filer sits in that bracket on taxable income from about $50,400 to $105,700, figured after the $16,100 standard deduction, per the IRS inflation adjustments for the year. Below that line, in the 10 or 12 percent bracket, a 22 percent hold is more than you owe, so the extra comes back. Above it, in the 24, 32, or 35 percent brackets, 22 percent falls short and you'll owe the gap.

Renee is a good example of the first case. Her salary put her taxable income around $41,900, squarely inside the 12 percent bracket. The real federal tax on her $4,000 bonus is about $480. Her employer held back $880, so roughly $400 is coming back to her as part of her refund. The Social Security and Medicare (that $306) is gone for good, and the state piece depends on her state's rules, but the federal over-withholding is real money returning.

The same math is starker on a bigger number. Say the bonus is $10,000 and your employer uses the flat 22 percent, so $2,200 gets withheld for federal tax no matter who you are.

If you're in that bottom band, the shrunken check is temporary and the money shows up again. If you're near the top, a bonus that felt generous can quietly set up an April bill instead. It hits people with equity compensation especially hard, since restricted stock vests get the same 22 percent default and land the same shortfall.

How to keep more of your next bonus

A few moves change the math before the money is even paid.

The biggest one is to route part of the bonus into a pre-tax account. A lot of 401(k) plans let you set a separate deferral rate for bonus pay, so you can send a slice straight into the plan before tax touches it. That shrinks the income you're taxed on, which no withholding tweak can do, and if your employer matches, you might pick up match dollars along the way. An HSA does the same job with an even friendlier tax profile if you're on a high-deductible health plan.

If you're a higher earner who now sees the 22 percent left you short, you have two tidy fixes. You can file a new W-4 and add an "extra withholding" amount on Line 4(c) for the rest of the year. Payroll withholding counts as if it were spread evenly across the whole year, so a fourth-quarter bump can repair a shortfall that built up earlier. Or you can make a direct estimated payment through IRS Direct Pay; the fourth-quarter deadline for 2026 income is January 15, 2027.

Set your expectations on the parts that never come back, too. The 22 percent federal piece is refundable when you over-withhold, but the 7.65 percent for Social Security and Medicare is a genuine tax on wage income (Social Security only up to the 2026 wage base of $184,500). No W-4 change touches that slice.

The Bottom Line

A shrunken bonus check is usually a withholding story, not a tax story, and the two have very different endings.

First, find your bracket. Take your expected taxable income (roughly your salary minus the $16,100 standard deduction if you're single, or $32,200 if you're married filing jointly) and see where it falls. Under the 22 percent line, a refund is building. At 32 percent or higher, start setting the gap aside now.

Second, pull the pay stub from the period your bonus landed and read the federal line. A clean 22 percent is the percentage method; a bigger, odd-looking number means the aggregate method annualized your check. Either way, anything over-withheld returns in the spring.

Third, if your next bonus hasn't been paid yet, ask HR if you can defer part of it into your 401(k) or HSA. That's the rare move that cuts the real bill instead of just the amount held back.

Fourth, if you're a high earner looking at a coming shortfall, file a new W-4 with extra withholding on Line 4(c), or make that January 15 estimated payment, before the underpayment grows into a penalty.