Why Is My Bonus Taxed So High?
It is not taxed higher. It is withheld higher, which is a different thing with a different remedy. Understanding which of the two methods your employer used tells you whether you will get money back or owe more.
Tax year 2026 · Updated 2026-08-29 · Guide
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Two methods, two very different feelings
Percentage method. The bonus is paid separately from regular wages and withheld at a flat 22% for federal income tax, rising to 37% on cumulative supplemental wages above $1,000,000 in a year. Add 7.65% FICA and a state rate and you keep roughly 65% to 70%.
Aggregate method. The bonus is added to a regular paycheck and the combined amount goes through the ordinary withholding tables. Because the percentage method annualizes, a $15,000 bonus on top of a $3,000 bi-weekly check looks like an annual salary of $468,000 and is withheld at 35%.
The second method is the source of nearly every 'my bonus was taxed at 40%' complaint. It is not a penalty, it is annualization.
What you actually owe
A bonus is ordinary income. It is taxed at your marginal rate, exactly like salary. If your marginal rate is 12%, the flat 22% over-withheld and you get the difference back. If your marginal rate is 32%, the flat 22% under-withheld and you may owe.
That second case is worth planning for. A large bonus for a high earner withheld at 22% can leave a four-figure balance in April, and if the shortfall is big enough an underpayment penalty applies. Adding to Step 4(c) of your W-4 for the rest of the year is the fix.
The parts that genuinely are extra
Social Security and Medicare apply to a bonus like any other wages. If your year-to-date wages have already passed the $184,500 base, no Social Security is withheld from the bonus at all — which makes a December bonus meaningfully more valuable than a January one for a high earner.
The Additional Medicare Tax of 0.9% starts once wages exceed $200,000, so a bonus that crosses that line has a genuinely higher marginal cost on the portion above it.
What you can actually do
Defer it into a 401(k) if your plan allows deferrals from supplemental pay. That removes it from income tax, though not from FICA, and can be a clean way to fund a large part of the annual limit in one move.
Negotiate the payment year if you expect a lower income next year. Ask whether the bonus can be paid separately rather than on a regular check, which usually triggers the more predictable 22% method.
And check the timing against the Social Security wage base if you are near it. The bonus calculator compares both methods side by side.
Frequently asked questions
Are bonuses taxed at 22%?
Withheld at 22% under the percentage method, but taxed at your ordinary marginal rate. The difference is settled when you file.
Why was 40% taken from my bonus?
The aggregate method annualized the pay period containing the bonus and withheld at the resulting high rate. The excess is refunded.
Can I put my whole bonus into my 401(k)?
If your plan allows deferrals from bonus pay and you have room under the $24,500 limit for 2026. FICA still applies to the deferred amount.
Do I get bonus tax back?
If more was withheld than your actual liability on that income, yes — as part of your refund.