Bonuses in most places are not actually taxed at a higher rate than your regular paycheck; they just look that way because of how tax is withheld and because they’re treated as “supplemental income” for payroll purposes.

What’s really happening

  • Your annual tax is based on your total income for the year and your tax brackets, not on whether money came as salary or bonus.
  • A bonus is usually treated as regular wage income in the end-of-year calculation, so it’s taxed at the same marginal rates as your other pay.

Why bonuses feel taxed so high

  • Employers often must use a flat “supplemental” withholding rate on bonuses (commonly around 22% in the U.S. up to a certain amount, with higher rates above very large bonuses), which can be higher than the effective rate showing on your normal paycheck.
  • On top of that, Social Security and Medicare (or similar payroll taxes) are also withheld, so the bonus check you see can easily lose 25–30%+ on paper, making it feel heavily taxed.

Two main payroll methods

  • Percentage (flat) method : The bonus is run separately and a fixed rate (for example 22%) is withheld for federal income tax, plus normal payroll taxes.
  • Aggregate method : The bonus is added to a regular paycheck; the system pretends you earn that larger amount every pay period and withholds as if you’re in a higher bracket, so that one check looks harsh even though the yearly tax will be reconciled later.

What happens at tax time

  • When you file your tax return, the tax authority looks at your total income and your actual tax brackets, then compares that to what was withheld from all paychecks and bonuses combined.
  • If too much was withheld from your bonus, you usually get it back as part of your refund; if too little, you may owe a bit more, but the rate applied to the bonus is still just your normal marginal tax rate, not some special “bonus tax.”

How to keep more of your bonus

  • Ask payroll or a tax professional whether you can adjust your withholding on the bonus (where allowed) so it’s closer to your real marginal rate.
  • Consider directing part of the bonus into tax-advantaged accounts like retirement or health savings accounts (where available in your country), which can reduce the taxable portion of that income.

Information gathered from public forums or data available on the internet and portrayed here.