A bonus is exciting until the deposit lands and a big slice appears to be missing. Bonuses are not taxed at a punishing special rate, but the way they are withheld makes them look that way. Understanding the difference between withholding and your actual tax clears up the confusion and prevents disappointment.
Supplemental wages and flat withholding
The IRS classifies bonuses as supplemental wages, which have their own withholding rules separate from your regular salary. Under the percentage method, employers withhold a flat 22 percent for federal income tax on supplemental wages up to $1 million, and 37 percent on any amount above that. This flat 22 percent is often higher or lower than your true marginal rate, which is why the check can feel over-taxed. Some employers instead use the aggregate method, lumping the bonus with your regular pay to compute withholding.
Withholding is not your final tax
The amount withheld from a bonus is a prepayment, not the actual tax you owe on it. When you file your return, the bonus is simply added to your ordinary income and taxed at your real rates. If 22 percent was withheld but your marginal rate is only 12 percent, the excess comes back as part of your refund. If your marginal rate is higher than 22 percent, you may owe the difference at filing.
FICA and state taxes still apply
Beyond federal income tax, bonuses are also subject to Social Security and Medicare, the same 7.65 percent as regular wages for most workers. States that levy income tax withhold from bonuses too, often at their own supplemental rate. Stacking federal, FICA, and state withholding is why a bonus can arrive noticeably smaller than the gross figure. None of this is a penalty; it is the same tax framework applied up front.
Planning around a bonus
You can soften the tax hit by routing part of a bonus into pre-tax accounts if your employer allows it. Contributing a bonus to a traditional 401(k) or HSA reduces the income tax owed on it, though FICA still applies. If too much was withheld, adjusting your W-4 for the rest of the year can rebalance your paychecks rather than waiting for a refund. Treat the after-tax bonus, not the gross, as the amount you can actually deploy.
Grace receives a $5,000 bonus. Her employer withholds 22 percent, or $1,100, for federal tax, plus $382.50 in FICA and some state tax, so her deposit is roughly $3,300. Because her actual marginal rate is 22 percent, the withholding closely matches her real tax, and little changes at filing.
Key takeaways
- Bonuses are supplemental wages, commonly withheld at a flat 22 percent for federal income tax.
- Flat withholding is a prepayment, and the bonus is ultimately taxed at your normal rates when you file.
- Bonuses still owe Social Security, Medicare, and any state income tax.
- Directing a bonus into a traditional 401(k) or HSA can reduce the income tax on it.
Common mistakes
- Believing bonuses face a special, higher tax rate rather than ordinary rates at filing.
- Spending the gross bonus amount before accounting for withholding.
- Forgetting that the flat 22 percent is only withholding, which is reconciled on your return.
FAQ
Why was so much taken out of my bonus?
Employers usually withhold a flat 22 percent federal rate on bonuses plus FICA and state tax, which can exceed your real marginal rate and is settled when you file.
Can I avoid tax on a bonus?
You cannot avoid it, but contributing the bonus to a pre-tax 401(k) or HSA lowers the income tax owed, though Social Security and Medicare still apply.