By The email says “Congratulations! Your annual bonus is $5,000.” The deposit says $3,346. Where did $1,654 go?
The short answer: your employer withheld at a flat supplemental rate, not your actual tax bracket. The long answer involves IRS rules that surprise almost every bonus recipient. Let’s decode it.
The Supplemental Withholding Rate
The IRS allows employers to withhold federal tax on bonuses (and commissions, severance, and other supplemental wages) using a flat rate instead of running them through regular tax brackets.
| Bonus Amount | Federal Withholding Rate |
|---|---|
| Under $1 million | 22% flat |
| Over $1 million | 37% flat (on the excess) |
This is a withholding rate, not your actual tax rate. Your real tax on the bonus is determined by your total annual income and brackets when you file your return.
Why the Paycheck Looks So Bad
Here’s the full stack of deductions on a $5,000 bonus for a single filer in Texas:
| Deduction | Rate | Amount |
|---|---|---|
| Federal (supplemental) | 22% | −$1,100.00 |
| Social Security | 6.2% | −$310.00 |
| Medicare | 1.45% | −$72.50 |
| Texas state tax | 0% | $0.00 |
| Net bonus | $3,517.50 |
You receive 70.4% of your bonus — 29.6% is withheld.
In a high-tax state like California:
| Deduction | Rate | Amount |
|---|---|---|
| Federal (supplemental) | 22% | −$1,100.00 |
| Social Security | 6.2% | −$310.00 |
| Medicare | 1.45% | −$72.50 |
| California supplemental (10.23%) | −$511.50 | |
| Net bonus | $3,006.00 |
In California, you receive only 60.1% of your bonus — 39.9% is withheld.
This is where the “my bonus was taxed at 40%” complaint comes from. The withholding is real — but the final tax bill may be different.
The Truth: Withholding vs Actual Tax
Here’s the critical distinction most workers miss:
Withholding is an estimate — money set aside throughout the year to cover your expected tax bill.
Actual tax is calculated once per year on your total income using progressive brackets.
Example: $85,000 salary + $5,000 bonus (single, Texas)
Total income: $90,000 Standard deduction: $16,100 Taxable income: $73,900
Actual federal tax on $73,900:
- 10% bracket ($0–$12,400): $1,240
- 12% bracket ($12,400–$50,400): $4,560
- 22% bracket ($50,400–$73,900): $5,170
- Total: $10,970
Effective rate on the bonus dollars (which are in the 22% bracket): 22%
But withholding on the bonus was also 22%. In this case, withholding was accurate.
When Withholding Over-Collects
If you earn $45,000 (12% bracket) and receive a $5,000 bonus:
- Withheld: 22% × $5,000 = $1,100
- Actual tax: 12% × $5,000 = $600
- Over-withheld: $500 → comes back as refund
When Withholding Under-Collects
If you earn $250,000 (35% bracket) and receive a $10,000 bonus:
- Withheld: 22% × $10,000 = $2,200
- Actual tax: 35% × $10,000 = $3,500
- Under-withheld: $1,300 → you owe at filing
Five Ways to Reduce Bonus Tax (Legally)
1. Increase Your 401(k) Contribution for the Bonus Period
Many employers allow you to set a separate contribution rate for bonuses. If you contribute 50% of your $5,000 bonus to 401(k):
| Without 401k | With 50% to 401k | |
|---|---|---|
| Bonus | $5,000 | $5,000 |
| 401(k) contribution | $0 | $2,500 |
| Taxable bonus | $5,000 | $2,500 |
| Federal withheld (22%) | $1,100 | $550 |
| FICA (7.65%) | $383 | $383 |
| Net received | $3,517 | $1,567 + $2,500 in 401k |
You take home less cash but $2,500 goes into your retirement account pre-tax.
2. Submit a Revised W-4 Before the Bonus
If you know your bonus date, file a new W-4 with extra deductions a week before. This reduces withholding on ALL wages including the bonus. Reverse it after the bonus pays.
Warning: This can under-withhold your regular checks. Calculate carefully.
3. Use HSA/FSA Windows
Bonuses are often eligible for HSA contributions. A $3,850 family HSA contribution (2026 limit) funded from your bonus reduces taxable income dollar-for-dollar.
4. Ask About Gross-Up
Some employers offer “grossed-up” bonuses — they calculate the tax and add it to your bonus so you net the target amount. This is common for relocation and executive bonuses but rare for regular performance bonuses.
5. Time Charitable Contributions
If you itemize, bunching charitable donations in the same year as a large bonus increases their deductible value at your (now higher) marginal rate.
Bonus vs Raise: The Total Compensation Math
A $5,000 bonus is not the same as a $5,000 raise:
| Factor | $5,000 Bonus | $5,000 Raise |
|---|---|---|
| One-time amount | $5,000 | $0 (spread across checks) |
| Annual recurring | $0 | $5,000 every year |
| 401(k) match increase | None (one-time) | Permanent increase |
| Future raises compound on it | No | Yes |
| 10-year total value | ~$5,000 | ~$50,000+ (with compounding raises) |
A raise is always worth more than an equal bonus over time because future percentage raises compound on the higher base.
Commission Earners: Different Rules
If commissions are more than 50% of your income, special withholding rules apply:
- Employers may add the commission to your regular wages and withhold on the combined total (more accurate)
- Or apply the flat 22% supplemental rate (simpler but often less accurate)
If commissions are your primary income and you consistently owe at tax time, ask your employer about method 1, or increase withholding on your W-4.
Frequently asked questions
Why is my bonus taxed at 40%?
Your bonus is probably withheld at 22% federal supplemental rate plus 7.65% FICA plus state tax. In California, New York, or Hawaii, this stack can reach 35–40%. This is withholding, not your actual rate — the difference settles when you file.
What is the supplemental withholding rate for 2026?
22% flat federal withholding for supplemental wages under $1 million, and 37% for amounts over $1 million. States have their own supplemental rates — California uses 10.23%, New York uses 9.65%, and nine states have none.
Do I get back the extra tax withheld from my bonus?
Yes, if over-withheld. Withholding is a prepayment against your actual annual tax liability. If your bonus was withheld at 22% but your marginal rate is 12%, the excess returns as a larger refund. Check your take-home pay calculation to estimate.
How can I pay less tax on my bonus?
Increase 401(k) contributions (bonuses are 401k-eligible), fund your HSA, bunch charitable donations in the same year, or submit a revised W-4 before the bonus pays. You cannot change the withholding rate, but you can reduce taxable income.
Is a bonus better than a raise?
Tax treatment is identical — both are ordinary income. Financially, a raise is superior because it compounds through future percentage increases, permanently raises your 401(k) match base, and continues every year. A bonus is one-time.
Are bonuses subject to Social Security tax?
Yes. Bonuses are wages subject to 6.2% Social Security (up to the $184,500 wage base in 2026) and 1.45% Medicare with no cap. If you have already exceeded the wage base when the bonus pays, Social Security withholding stops — a rare case where late-year bonuses net more.
How do I calculate exactly what my bonus will net?
Enter your bonus as additional income in the take-home pay calculator, or multiply your bonus by 0.70 (Texas, no state tax) to 0.60 (California) for a quick estimate. The exact number depends on your state’s supplemental rate and your year-to-date FICA wages.
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