Bonus Tax Withholding: Why Your Bonus Paycheck Looks Smaller
Bonuses are not usually taxed at a special final tax rate, but they are often withheld under supplemental wage rules, which can make the bonus paycheck look unusually small.
What this page helps you do
- Separate bonus withholding from final tax liability
- See how a flat supplemental withholding method changes the check
- Learn how commissions and bonuses affect annual planning
Reading time: about 7 minutes. Calculator results are estimates for planning, not tax, legal or payroll advice.
What Is Bonus Tax Withholding?
Bonus tax withholding is the payroll tax withholding applied to supplemental wages such as bonuses, commissions, overtime awards, and certain incentive payments. The withheld amount is a prepayment, not necessarily your final tax on the bonus.
Regular wages and supplemental wages may be withheld differently, which is why two checks in the same month can have different net percentages.
Why Does My Bonus Look Taxed So High?
Your bonus looks taxed high because federal supplemental withholding, FICA, state tax, retirement contributions, and benefit rules may all hit one separate check. If payroll uses a flat federal supplemental rate, the check can feel disconnected from your normal paycheck.
The bonus check is not the final verdict. Your tax return reconciles withholding against your actual annual taxable income.
Original 2026 Bonus Withholding Model
In our 2026 bonus model, we compared a $5,000 supplemental payment before and after common withholding layers:
| Layer | Planning rate | Amount on $5,000 bonus | Remaining bonus |
|---|---|---|---|
| Federal supplemental withholding | 22% | ~$1,100 | ~$3,900 |
| Social Security + Medicare | 7.65% | ~$383 | ~$3,517 |
| State withholding model | 5% | ~$250 | ~$3,267 |
| Approx. net bonus | 34.65% withheld | ~$1,733 | ~$3,267 |
This simplified model explains the paycheck experience. Your actual return can refund or collect more depending on annual income and deductions.
How to Plan for Bonus and Commission Pay
Step 1: Ask whether payroll uses aggregate or percentage withholding
The method changes the check. A separate bonus run may look different from a bonus added to normal wages.
Step 2: Model the bonus as annual income
Add the expected bonus to base salary before judging tax impact. Use Gross vs Net Pay to separate withholding from final tax.
Step 3: Revisit W-4 if variable pay is large
If commissions or bonuses are a major part of compensation, review the W-4 Withholding Guide and IRS estimator mid-year.
Bonus Tax Withholding FAQs
Bonuses may be federally withheld at 22% under a common supplemental wage method, but your final tax depends on your full-year taxable income.
Commission checks can be treated as supplemental wages and may include federal withholding, FICA, state tax, retirement deductions, and benefit rules.
You may get some withholding back if too much was withheld for your annual tax situation, but it depends on the full tax return.