How Much of My Bonus Actually Goes to Taxes — and How to Keep More
Why your bonus looks like it was taxed at 40 percent
Regular paychecks use a formula that spreads your annual tax evenly across the year, so each check has just a slice of your total tax withheld. Bonuses are different. The IRS classifies a bonus as supplemental wages, and most employers use the flat-rate method: they withhold a flat 22 percent for federal income tax on supplemental pay up to 1 million dollars (37 percent on any portion above that). There is no attempt to match the withholding to your personal bracket — the flat rate is applied to everyone the same way, which is precisely why it feels arbitrary.
On top of the 22 percent federal withholding, your bonus is also hit with the usual payroll taxes: 6.2 percent Social Security (up to the annual wage base) and 1.45 percent Medicare. Add a typical state income tax withholding of 3 to 6 percent and you land somewhere between 31 and 40 percent gone at payday. That is why a 10,000 dollar bonus so often deposits as roughly 6,200 to 6,900 dollars.
The number that actually matters: your marginal rate
Here is the part nobody tells you at the office: the 22 percent is withholding, not your tax. Withholding is a prepayment. Your true federal tax on that bonus is whatever your marginal rate is — the rate on your next dollar of income. If your salary already puts you in the 24 percent, 32 percent, or 35 percent bracket, the flat 22 percent withholding is too little and you will owe the shortfall in April. If you are in the 12 percent bracket, 22 percent was too much and the difference comes back as a refund.
Before you assume the worst, find out which bracket your bonus actually lands in. Our marginal vs effective rate calculator shows the gap between your headline bracket and what you truly pay, and tells you how much income room is left before the next bracket — the single most useful number for bonus planning.
A worked example: the 10,000 dollar bonus
Meet Dana, a single filer earning 90,000 dollars in salary who receives a 10,000 dollar year-end bonus. Here is what leaves at payday versus what she actually owes on that bonus.
| Line item | Rate | Withheld at payday |
|---|---|---|
| Federal (flat supplemental) | 22% | $2,200 |
| Social Security | 6.2% | $620 |
| Medicare | 1.45% | $145 |
| State (illustrative) | 5% | $500 |
| Total withheld | 34.65% | $3,465 |
| Bonus deposited | $6,535 |
Now the reality check. Dana's salary of 90,000 dollars minus the 15,000 dollar 2025 standard deduction leaves 75,000 dollars of taxable income, which sits in the 22 percent bracket (single). Her bonus stacks on top and is also taxed at 22 percent federally — so the 2,200 dollars withheld exactly matches her federal tax on the bonus. She gets none of the federal portion back, but she does not owe more either. Payroll and state taxes were correct too. Dana's bonus was taxed fairly; it only felt like 40 percent because a third of it vanished at once.
Change one detail and the story flips. If Dana earned 260,000 dollars, her bonus would land in the 35 percent bracket — the 22 percent flat withholding would leave her owing an extra 1,300 dollars in April. See exactly where your own bonus lands with the marginal vs effective rate reveal before you spend it.
How to keep more of your bonus (legally)
You cannot change the 22 percent withholding rate — it is set by IRS regulation for supplemental wages. But you can change how much of the bonus is taxable, and you can stop the withholding gap from surprising you:
1. Defer it into pre-tax accounts. Ask payroll to route part of the bonus into your 401(k) or HSA before taxes apply. A dollar contributed to a traditional 401(k) escapes both the 22 percent federal and your marginal tax entirely this year. An HSA dollar escapes federal, state, and the 7.65 percent payroll tax when contributed through payroll.
2. Close the withholding gap on purpose. If your bonus stacks into a bracket above 22 percent, you are under-withheld and can face an underpayment penalty. Our RSU and bonus withholding gap calculator shows the exact shortfall so you can adjust your W-4 or make an estimated payment before the penalty applies.
3. Time it around bracket edges. If your employer lets you choose the pay period, and your bonus would push you over a bracket line, splitting it across two tax years — or pairing it with a deductible contribution — can keep more dollars in the lower bracket. The bracket room figure tells you how much space you have to work with.
4. Do not overreact and end up over-withheld. The opposite mistake is just as common. If your salary keeps you in the 12 percent bracket, the 22 percent flat withholding took nearly twice the federal tax you actually owe on the bonus, and that surplus sits with the IRS interest-free until you file. Rather than celebrate the eventual refund, adjust your regular W-4 so the money reaches your paycheck sooner, where it can pay down debt or get invested during the year instead of after it.
Frequently asked questions
Is my bonus taxed at a higher rate than my salary?
No. A bonus is withheld differently — a flat 22 percent federal rate for supplemental wages under 1 million dollars — but it is taxed at the same marginal rate as the rest of your income when you file. The high withholding is a prepayment, not a higher tax.
Why did roughly 40 percent of my bonus disappear?
The 22 percent flat federal withholding stacks with 6.2 percent Social Security, 1.45 percent Medicare, and state withholding, which together can reach 31 to 40 percent. It vanishes all at once, which feels dramatic, but much of it may return as a refund if your true rate is below 22 percent.
Can I get the bonus tax back?
Partly. If your marginal tax rate is below 22 percent, the excess federal withholding is refunded when you file. Social Security and Medicare taxes are not refundable. If your rate is above 22 percent, you will owe the difference rather than get money back.
How do I avoid owing money on a large bonus?
If your bonus pushes income into a bracket above 22 percent, the flat withholding is too low. Use the withholding gap calculator to find the shortfall, then either increase withholding via a new W-4 or make a quarterly estimated payment before the IRS safe-harbor deadline to avoid an underpayment penalty.
Does contributing my bonus to a 401(k) reduce the tax?
Yes. Bonus dollars routed into a traditional 401(k) or HSA through payroll are excluded from taxable income for the year, so they escape the 22 percent federal withholding entirely. HSA payroll contributions also skip the 7.65 percent Social Security and Medicare tax.
What is the aggregate method and could it help me?
The aggregate method combines the bonus with your regular paycheck and withholds as if that total were your normal pay, which can withhold more or less than the flat 22 percent depending on your bracket. Employers choose the method; you cannot pick it, but knowing which one was used explains an unexpected deposit.
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