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Why Are Bonuses Taxed So High?

A $5,000 bonus arriving as $3,200 stings. The sting has a name — supplemental wage withholding — and a logic: the IRS wants a simple rate that collects roughly the right amount from most workers without running W-4 tables on every bonus. For many workers it overshoots, and the overshoot is refunded at filing. Here's the whole story in four steps.

Quick answer: Bonuses are withheld at a flat 22% federal (plus FICA and state) regardless of your actual bracket. If your effective rate is 15%, roughly $350 of a $5,000 bonus is over-withheld and comes back as a refund — the bonus itself is only taxed once, at your real rate.

The flat rate is a shortcut, not your tax rate

Running your bonus through the W-4 tables would withhold based on your filing status and dependents — accurate but slow. The percentage method's flat 22% approximates a middle-bracket worker. If your marginal bracket is 12%, the flat rate takes nearly double what you'll owe; at 32%, it under-withholds and April brings a bill.

FICA and state stack on top

7.65% FICA comes off every bonus dollar (unless you've passed the Social Security wage base). State withholding adds 0%–10.23%. The perceived 'tax' on a bonus is usually this stack — 30–40% — compared with perhaps 18–22% net effective withholding on your regular check.

How the money comes back

  • At filing: your W-2 adds the bonus to wages once; the tax computed on your actual bracket determines what was over-withheld.
  • Mid-year: a W-4 update can reduce withholding on later regular checks to compensate.
  • Pre-tax deflections: 401(k), HSA or FSA elections applied to the bonus shrink the taxable base before withholding runs.

When a bonus genuinely costs more tax

In a year where the bonus pushes you across a bracket threshold, the margin — only the dollars above the line — is taxed higher than it would have been alone. That's real extra tax, but it's marginal and usually small; the feeling of 'they took 40%' is almost always withholding, not liability.

Frequently Asked Questions

Can I ask my employer to withhold less on my bonus?
The flat 22% is fixed for supplemental payments — but you can claim exemption from withholding only if you had no tax liability last year and expect none this year, or adjust your W-4 for the year overall.
Does asking for the bonus in January reduce tax?
It defers withholding and liability into the next year — occasionally useful across a bracket change or the SS wage base, but the tax still applies when paid.

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