Your bonus letter said $5,000. The check that landed said $3,392.50. Somewhere between those two numbers, most people decide the government "taxes bonuses extra" — and once that idea takes hold, it shapes real decisions: people ask to have bonuses spread across paychecks, turn down spot awards as "not worth it after tax," or budget as if a third of every bonus is simply gone.
Here is the thing: bonuses are not taxed at a special higher rate. They are withheld at a special rate, which is a completely different claim. The difference between those two words — taxed and withheld — is worth real money to understand, because for a lot of workers the "missing" chunk of the bonus comes back at filing time. For a smaller group of high earners, the opposite happens: the bonus check looks generous and a bill arrives in April.
Let's walk through where the $1,607.50 in that opening example actually went, and which parts of it you'll see again.
Withholding is an estimate, not a verdict
When April comes, your bonus lands on your Form 1040 in the same box as your salary: wages. The IRS does not have a separate "bonus tax." Your total income for the year gets run through the ordinary bracket math, and every dollar of bonus is taxed at whatever rate applies given your total income — the same as if you had earned it as salary.
Withholding is just the pay-as-you-go estimate your employer sends in on your behalf during the year. For regular paychecks, that estimate comes from your Form W-4 and the withholding tables. For bonuses, commissions, severance, and other one-off payments, the IRS uses a different set of rules — because a one-time payment breaks the assumption the normal tables rely on, which is that this paycheck looks like all your other paychecks.
The reconciliation happens on your tax return. If your employer withheld more than your actual tax, the difference comes back as a refund. If they withheld less, you owe the gap. The bonus check is never the final answer; the 1040 is.
The two methods payroll can use
The IRS calls bonuses "supplemental wages," and Publication 15, the employer's tax guide, gives employers two ways to withhold federal income tax on them:
The flat percentage method. If the bonus is paid separately from regular wages (or identified separately on the check stub), the employer can simply withhold a flat 22% for federal income tax. No W-4 math, no tables — 22% off the top. This is the method behind almost every "why did my bonus get taxed so hard" conversation, and it's why the number 22% shows up on so many bonus stubs. One fine-print condition: the employer can only use this method if they withheld income tax from your regular wages in the current or preceding year.
The aggregate method. If the bonus is lumped into a regular paycheck without being identified separately — or if the employer just prefers it — payroll adds the bonus to that period's regular wages and runs the combined amount through the normal withholding tables, then subtracts what was already withheld on the regular wages. This method can withhold dramatically more than 22%, because of how the tables annualize (more on that in the worked examples).
Above $1 million, there is no choice. Once your supplemental wages for the calendar year pass $1 million, federal law requires the employer to withhold 37% — the top individual rate — on the excess, regardless of your W-4 and regardless of which method they'd otherwise use. The first $1 million can still be withheld at 22%; everything past it is 37%, full stop. (These rates held at 22% and 37% for 2026 because the underlying individual rate schedule was made permanent by 2025 legislation.)
Neither method changes your actual tax by a cent. They only change the size of the estimate.
FICA and state tax: the add-ons that make 22% feel like 35%
The flat 22% is only the federal income tax piece. A bonus is ordinary wages for payroll-tax purposes, so Social Security and Medicare taxes come out too:
| Withholding line | Rate | Applies to |
|---|---|---|
| Federal income tax (flat method) | 22% | The whole bonus (up to $1M/yr of supplemental wages) |
| Social Security | 6.2% | Wages up to the annual wage base ($184,500 in 2026) |
| Medicare | 1.45% | All wages, no cap |
| Additional Medicare | 0.9% | Wages above $200,000 in the calendar year |
| State income tax | varies | Per state rules; many states have their own flat supplemental rates |
Stack those up and a mid-income earner in a state with an income tax routinely sees 30–35% come off a bonus check. That's the arithmetic behind the opener: $5,000 minus $1,100 federal (22%), minus $310 Social Security (6.2%), minus $72.50 Medicare (1.45%), minus $125 state (a 2.5% flat-rate state) leaves $3,392.50.
Two things about the FICA lines are worth knowing. First, unlike the federal income tax piece, Social Security and Medicare withholding is generally final — it's not an estimate that reconciles into a refund, because payroll taxes aren't computed on your 1040 bracket. Second, the Social Security piece disappears for high earners late in the year: once your year-to-date wages cross the wage base ($184,500 for 2026, per the Social Security Administration), no more 6.2% comes out — which is why a December bonus for a $250,000 earner has a noticeably smaller FICA bite than a March bonus for a $60,000 earner.
Worked example 1: the $4,000 bonus that comes back
Maya earns $48,000 a year. After the standard deduction, her taxable income tops out in the 12% federal bracket. In November she gets a $4,000 bonus, paid as a separate check, so payroll uses the flat method:
- Federal income tax withheld: $4,000 × 22% = $880
- Social Security: $4,000 × 6.2% = $248
- Medicare: $4,000 × 1.45% = $58
Federal-only, her check shrinks by $1,186 before state tax. But what is her actual federal income tax on those bonus dollars? Her total income, bonus included, still lands in the 12% bracket, so the bonus costs her $4,000 × 12% = $480 in real federal income tax.
Withheld: $880. Owed: $480. The extra $400 isn't gone — it's sitting in her withholding account at the IRS, and it comes back when she files, either as a bigger refund or a smaller balance due. The $306 of FICA is real and stays paid, same as it would on salary. So Maya's true all-in federal cost on the bonus is $786, not the $1,186 the stub implied.
Now suppose her employer had instead used the aggregate method — folding the $4,000 into her regular $4,000 monthly check. Payroll computes withholding on an $8,000 "month," and the tables treat that as if she earns $8,000 every month: a $96,000-a-year pace. Withholding for that one check gets calculated at the marginal rates of a $96,000 earner, even though Maya will actually make $52,000. That's the aggregate method's quirk: it annualizes a one-time spike, so it typically over-withholds even harder than the flat 22% for people whose bonus is large relative to a single paycheck. The exact figure depends on her W-4 and the current-year tables, which is tedious to do by hand — running your own paycheck through NetPayKit's bonus tax calculator with both methods side by side shows the gap in seconds. Either way, the destination is identical: the 1040 trues everything up to $480.
Worked example 2: the $100,000 bonus that leaves a bill
Daniel earns a $250,000 salary and gets a $100,000 bonus in December, paid separately. His top federal rate is 35%. Payroll uses the flat method:
- Federal income tax withheld: $100,000 × 22% = $22,000
- Social Security: $0 — his year-to-date wages passed the $184,500 wage base months ago
- Medicare: $100,000 × 1.45% = $1,450
- Additional Medicare: $100,000 × 0.9% = $900 (payroll must withhold this on all wages above $200,000, and his salary alone crossed that line)
His check keeps $75,650 before state tax — a far friendlier-looking number than Maya's percentage. But the real federal income tax on those bonus dollars, at his 35% marginal rate, is roughly $35,000. Withholding covered $22,000 of it. The remaining ~$13,000 shows up as a balance due when he files — and if the gap is big enough and nothing else covers it, it can also trip the estimated-tax underpayment rules, which add interest-based penalties on top.
This is the mirror image of Maya's situation, produced by the same flat 22%: one rate applied to everyone over-collects from people below the 22% bracket and under-collects from people above it. The table version:
| Maya | Daniel | |
|---|---|---|
| Bonus | $4,000 | $100,000 |
| Federal withheld (22%) | $880 | $22,000 |
| Actual federal income tax on bonus | $480 (12%) | ~$35,000 (35%) |
| At filing | ~$400 back | ~$13,000 owed |
| Social Security on bonus | $248 | $0 (over wage base) |
| Medicare incl. surtax | $58 | $2,350 |
Same rule, opposite outcomes. Neither of them was "taxed at 22%." Nobody is.
The bracket myth inside the myth
A related fear deserves a direct answer: "my bonus pushed me into a higher bracket, so now all my income is taxed more." That's not how brackets work. US federal brackets are marginal — crossing a bracket line means only the dollars above the line are taxed at the higher rate. If a $5,000 bonus pushes the last $2,000 of your income into the 22% bracket, those $2,000 are taxed at 22% and everything below the line stays where it was. A bonus can never reduce your after-tax income. (It can shave income-tested benefits and credits at certain thresholds, which is a real but separate mechanism — that's about eligibility phase-outs, not bracket rates.)
What you actually control
You can't choose your withholding method — that's the employer's call within the IRS rules — but you're not a spectator either:
Ask payroll which method they use. It's a normal question and the answer is usually one sentence. Knowing whether your bonus will see the flat 22% or the aggregate tables tells you what the check will look like before it lands, and whether the stub number will overstate or understate your real tax.
Adjust your W-4 to steer the annual total. The W-4 doesn't change bonus withholding directly under the flat method, but it controls the estimate on every regular paycheck, which is the lever for making the year come out even. Someone like Maya, who over-withholds on every bonus, can reduce regular withholding to offset it; someone like Daniel can use Step 4(c) of the W-4 to have extra tax taken from regular pay so April holds no surprise. The IRS Tax Withholding Estimator is built for exactly this — it takes expected bonuses as an input and tells you what W-4 entries make the total land close to your actual tax.
Read the stub, not the rumor. Every deduction line on a bonus stub is either an estimate that reconciles (federal and state income tax) or a flat payroll tax you'd pay on salary anyway (FICA). Once you can sort the lines into those two buckets, the "bonuses are taxed extra" myth has nothing left to stand on.
FAQ
Are bonuses taxed at a higher rate than salary?
No. On your tax return, bonus dollars are ordinary wages taxed at your regular marginal rates. Only the withholding is different — a flat 22% federal rate (37% on amounts over $1 million per year) instead of your W-4-based rate.
Why did my bonus check lose closer to 40% than 22%?
The 22% is federal income tax only. Social Security (6.2%), Medicare (1.45%), state income tax, and any retirement or benefit deductions your employer applies to bonuses stack on top. In a higher-tax state, a mid-30s total percentage is normal.
Do I get the over-withheld amount back?
The federal and state income-tax portions reconcile on your returns — over-withholding becomes refund, under-withholding becomes balance due. FICA withholding does not reconcile that way; it's a final payroll tax, just as it is on salary.
Can I ask my employer to withhold less from my bonus?
Under the flat method, no — 22% is fixed by the IRS rules, not by your W-4. What you can adjust is withholding on your regular paychecks via a new W-4, which changes where your annual total lands.
Is the 37% rate something I choose or avoid?
Neither. It's mandatory withholding on supplemental wages above $1 million in a calendar year, applied by the employer automatically. Like the 22%, it's an estimate — the true rate is settled on your return.
Does a bonus in December work differently than one in March?
For income tax, no — the year's total is what matters. For Social Security, timing can matter a lot: if your year-to-date wages have already crossed the annual wage base ($184,500 in 2026), no 6.2% comes out of the bonus at all.
Where this leaves you
The next time a bonus stub arrives, the useful exercise takes about two minutes: separate the lines into "estimates" (federal and state income tax) and "final" (Social Security, Medicare), compare the federal line against your own top bracket, and you'll know today — not next April — whether that check over-paid or under-paid your real tax. People below the 22% bracket generally find the stub overstates the damage; people well above it find the stub flatters the check. The bonus was never taxed extra. It was estimated bluntly, and the 1040 has always been where the blunt estimate gets sharpened into the true number.
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