Every year, millions of American workers receive an annual performance bonus, retention award, or commission check, only to experience severe sticker shock upon reviewing their paycheck stub: Why was nearly 40% to 50% of my bonus deducted in taxes? Are bonuses taxed at a higher rate than regular salary?
The short answer is no: the IRS does not levy a higher statutory tax rate on bonuses. At tax filing time, a dollar of bonus income is taxed at the exact same marginal rate as a dollar of regular hourly wages.
However, the withholding rules that employers are legally required to follow on supplemental wages create the illusion of an exorbitant tax penalty.
The Statutory Supplemental Wage Withholding Rules
- Annual and quarterly performance bonuses.
- Sales commissions.
- Overtime pay and shift differentials.
- Accumulated sick leave payouts and severance pay.
- Equity compensation vesting (Restricted Stock Units - RSUs).
Employers must withhold federal income taxes on supplemental wages using one of two IRS-sanctioned methods:
- If supplemental wages exceed $1,000,000, the excess is withheld at the maximum statutory rate of 37%.
- Example: If your bi-weekly paycheck is normally $4,000 ($104,000 annual run-rate), but you receive a $20,000 bonus on the same check, the payroll engine calculates withholdings assuming you earn $24,000 every two weeks (an annualized salary of $624,000!).
- This pushes that single check into the highest 32%, 35%, and 37% tax brackets, resulting in massive overwithholding.
Why Your Bonus Check Feels So Small
Even with the flat 22% federal rate, when you add all mandatory payroll withholdings together, the total deduction percentage is significant:
| Tax Deduction Component | Statutory Rate Applied |
|---|---|
| Federal Income Tax (Supplemental Rate) | 22.00% |
| Social Security (OASDI) | 6.20% (up to $176,100 cap) |
| Medicare Tax | 1.45% (plus 0.9% if over $200k) |
| State Income Tax (e.g., California 10.23% or NY 11.7%) | 6.00% – 10.23% |
| Total Mandatory Withholding | 35.65% – 40.78% |
When local city income taxes (like New York City's 3.876%) or voluntary pre-tax 401(k) deductions (e.g., 10%) are added, take-home pay on a bonus check can easily drop to 50% or less of the gross amount.
True Tax Liability vs. Withholding: The Year-End Reconciliation
Always remember that withholding is merely an estimate, not your final tax liability.
- If your actual marginal federal tax bracket is 12%, but your bonus was withheld at 22%, the IRS will refund the 10% difference.
- Conversely, if your marginal bracket is 32% or 35%, the flat 22% supplemental withholding was actually insufficient. You will owe the difference on April 15 unless you submitted extra withholding on Form W-4 Line 4(c).
Calculate Your 2025/2026 Taxes
Put these insights into practice. See how your salary, filing status, and deductions translate into net take-home pay.