A $5,000 year-end bonus usually lands in your checking account as something closer to $3,500. Take out 22% for federal withholding and 7.65% for Social Security and Medicare and you’re at $3,517.50 before your state takes its cut. Most of us look at that, frown, and decide bonuses must be taxed at some punishing special rate. I used to think so too. There’s no such thing as a bonus tax rate, though. There’s a bonus withholding rate, which is a different animal. And depending on what you earn, that flat 22% is either quietly lending the IRS your money or setting you up for a bill in April.
If you’re one of the lucky ones with a bonus coming this December (the Bureau of Labor Statistics says only 15% of private industry workers had access to end-of-year bonuses as of March 2026, and 21% in management and professional jobs), the math below tells you which side you’re on.
The bonus tax rate is really just a withholding shortcut
Your bonus is ordinary income. It gets taxed at the same brackets as your salary, full stop. What’s different is how your employer withholds on it. Under IRS rules, employers can treat a bonus as “supplemental wages” and withhold a flat 22% for federal income tax, rising to 37% only on supplemental pay above $1 million in a year (IRS Publication 15). The other option, which some payroll systems use, is to lump the bonus in with your regular paycheck and withhold as if you earned that bigger check every pay period. That’s why one coworker’s bonus can look far more gutted than another’s.
On top of the 22%, you’ll see Social Security at 6.2% and Medicare at 1.45%, the same 7.65% that comes out of every paycheck, plus whatever your state takes. That stack is where the missing $1,482.50 goes.
Most bonus articles mention the next part in one line and move on, and I think it’s the most useful thing to know: 22% is a guess. The IRS picked it because it matches one tax bracket. If your top bracket is lower, you’re overpaying now. If it’s higher, you’re underpaying.
Where your last dollar lands decides everything
Here are the 2026 federal brackets for single filers, from IRS Revenue Procedure 2025-32 as summarized by the Tax Foundation. The 12% bracket runs from $12,401 to $50,400 of taxable income, 22% runs to $105,700, and 24% runs to $201,775. The standard deduction for a single filer is $16,100.
Add the standard deduction back and you get two dividing lines in gross pay. A single woman taking the standard deduction stays in the 12% bracket until her salary plus bonus passes $66,500 ($50,400 plus $16,100). She hits 24% once that total passes $121,800 ($105,700 plus $16,100). Below the first line, 22% withholding is too high. Between the lines, it’s about right. Above the second, it’s too low.
Those lines assume no other income and no big deductions, so treat them as a starting point, not a verdict. Married couples filing jointly have roughly double the thresholds, and a 401(k) contribution lowers your taxable income too.
Running the numbers on three bonuses
Picture three single women, all taking the standard deduction.
Sarah earns $55,000 and gets a $5,000 bonus. Her taxable income before the bonus is $55,000 minus $16,100, or $38,900. Adding the bonus takes her to $43,900, still under the $50,400 top of the 12% bracket. So the bonus really costs her 12% in federal income tax, which is $600. Her employer withholds 22%, which is $1,100. She’s overpaid by $500, and she’ll get it back as part of her refund next spring. The IRS isn’t keeping it, but it’s holding it, interest free, for about four months.
Dana earns $90,000 and gets a $5,000 bonus. Her taxable income goes from $73,900 to $78,900, solidly inside the 22% bracket. Withholding of $1,100 matches her real tax of $1,100. The flat rate was built for her.
Priya earns $210,000 and gets a $30,000 bonus. Her taxable income before the bonus is $193,900. The first $7,875 of her bonus fills out the 24% bracket up to $201,775, which costs $1,890. The remaining $22,125 lands in the 32% bracket and costs $7,080. Her real federal tax on the bonus is $8,970. Her employer withheld 22%, or $6,600. She’s short $2,370, and nobody is going to tell her until she files.
All three also paid 7.65% in Social Security and Medicare on the bonus. That part isn’t a guess, and it doesn’t come back. One exception: Social Security stops at the $184,500 wage base for 2026, so Priya’s salary already maxed it out before the bonus arrived, and she only paid the 1.45% Medicare on hers.
What to do in December, depending on which woman you are
If you’re Sarah, you don’t owe anything extra. The overpayment comes back with your refund. If you’d rather have that money now, the fix is for next year: look at your W-4 in January. You can also ask HR whether you can send part of the bonus to your 401(k), which shrinks the taxable amount before any of this math starts.
If you’re Dana, relax. The withholding fits.
If you’re Priya, act before your last paycheck of the year. The IRS says you generally avoid an underpayment penalty if you owe less than $1,000 after withholding, or if your total payments cover at least 90% of this year’s tax or 100% of last year’s, whichever is smaller (IRS, estimated taxes). Higher earners face a tougher prior-year test, so check Publication 505 or ask a tax pro. The simplest move is to file a new W-4 asking for extra withholding from your December paychecks to cover the shortfall. If you only have one or two paychecks left, ask payroll how fast a new W-4 takes effect, because some systems need a full pay cycle.
I’m not a tax professional, and your situation may have wrinkles mine doesn’t. Still, knowing the math behind the stub makes the pay conversation a lot less mysterious. If you’re also heading into review season, my notes on writing a self-assessment cover the conversation that decides how big that bonus is in the first place.
Your real bonus tax rate is your top bracket
Bonuses don’t get taxed at 22%. They get withheld at 22%, and the tax itself is whatever your top bracket is. You can find that number in a couple of minutes with last year’s return and the bracket table above. Do it before the check lands. If you’re under the $66,500 line, the gap on your pay stub is partly a refund on its way. If you’re over $121,800, part of it is a bill you can still shrink with one form in December.