Your bonus hit and the number on your paystub looks far smaller than you expected. Before you call payroll, understand what happened, the rules for how bonuses are taxed differ from your regular paycheck in one key way: withholding. This guide explains both IRS-approved withholding methods, the real 2026 brackets, and a dollar-by-dollar worked example.
See your exact bonus take-home in seconds, enter your salary, bonus, and state and get a full withholding breakdown.
What Kind of Income Is a Bonus?
The IRS classifies bonuses as supplemental wages, compensation paid to an employee in addition to their regular wages, alongside commissions, overtime pay, back pay, and severance.
From a tax-liability standpoint, supplemental wages are ordinary income, taxed at exactly the same marginal rates as your salary when you file your annual return. There is no special "bonus tax." The confusion arises entirely from withholding, the upfront estimate your employer takes out, which the IRS governs through two separate methods, neither of which changes what you ultimately owe.
The Flat-Rate Withholding Method: The 22% Rule
When a bonus is paid on a separate check, or is clearly identified as separate from regular wages on a combined check, employers may use the flat-rate (also called the percentage) method. For 2026, the flat supplemental withholding rate is 22% on the first $1,000,000 of supplemental wages paid to an employee in a calendar year (verify current rate at irs.gov, as Congress can adjust this figure).
The calculation is simple: multiply the bonus amount by 22%. A $10,000 bonus yields $2,200 in federal income tax withholding, no W-4 lookup, no annualization required.
What about very large bonuses? Supplemental wages above $1,000,000 per employer per calendar year are subject to a mandatory 37% withholding rate on the excess above $1 million, regardless of what W-4 elections say (source: IRS Publication 15-T, 2026). The first $1 million still follows the 22% / aggregate rules.
The Aggregate Method: Combining Bonus With Regular Pay
The aggregate method treats your bonus as additional regular wages. Your employer adds the bonus to your regular paycheck and applies the IRS withholding tables from Publication 15-T to the combined amount:
- Add the bonus to your regular gross wages for the pay period to get a combined figure.
- Annualize that combined gross (multiply by pay periods per year) and look up the withholding using IRS Publication 15-T tables and your W-4 elections.
- Subtract the withholding calculated on your regular wages alone, the difference is the withholding attributed to the bonus.
Because the annualized combined figure is much larger than your actual annual income, the aggregate method frequently pushes you into a higher bracket for the purposes of the withholding calculation, meaning more is withheld than the flat method would take, which comes back as a refund when you file.
When a bonus and regular wages cannot be separately identified on the same paycheck, the aggregate method is required by IRS rules, not optional. See our guide on how to do payroll for more on employer withholding obligations.
Flat Rate vs. Aggregate: Which Method Applies to You?
The table below summarizes when each method is used and what to expect from each:
| Factor | Flat-Rate Method (22%) | Aggregate Method |
|---|---|---|
| When it applies | Bonus paid on a separate check, or clearly identified separately on a combined check | Bonus added to regular wages without clear separation; or employer's preference |
| Federal income tax withheld | 22% of bonus amount (flat) | Varies; often higher than 22% due to annualization effect |
| Calculation complexity | Simple, one multiplication | Complex, requires IRS Pub. 15-T tables and W-4 data |
| W-4 elections used? | No | Yes |
| Likely withholding result vs. actual tax owed | Often close; may under- or over-withhold for non-22% bracket taxpayers | Frequently over-withholds, especially for mid-income earners |
| Effect on refund at filing | Depends on your actual marginal rate | Usually produces a refund; rarely under-withholds |
| Employer choice? | Yes, when bonus is separately identified | Required when bonus is lumped with regular pay; optional otherwise |
You do not get to choose the method, that is the employer's call. Check whether your bonus arrived on a separate paycheck or combined with regular wages, and ask payroll if unclear.
FICA Taxes on Bonuses
Regardless of which income tax withholding method your employer uses, bonuses are wages for FICA purposes and are subject to both Social Security and Medicare taxes. For 2026 (verify annually at ssa.gov and irs.gov):
| Tax | Employee Rate | 2026 Wage Limit |
|---|---|---|
| Social Security | 6.2% | $184,500 (verify at ssa.gov, SSA adjusts annually) |
| Medicare | 1.45% | No cap, applies to all wages |
| Additional Medicare Tax | 0.9% | Wages above $200,000 (single); $250,000 (MFJ), not inflation-adjusted |
For most employees, a $10,000 bonus in 2026 adds $620 in Social Security and $145 in Medicare for a combined FICA hit of $765. Two important nuances:
- If you have already hit the SS wage base: If your year-to-date regular wages from the same employer have already exceeded $184,500 before the bonus is paid, Social Security does not apply to the bonus, only Medicare does. This is common for high-salary employees who receive late-year bonuses.
- Additional Medicare Tax: Your employer is required to begin withholding the extra 0.9% once your wages from that employer exceed $200,000 in the calendar year. If a bonus pushes you over that threshold mid-year, withholding starts on the excess.
Your Actual Tax Rate on a Bonus: The 2026 Brackets
When you file your tax return, your bonus is stacked on top of your other income and taxed progressively through the same brackets as your salary. The table below shows the 2026 federal income tax brackets for single filers (IRS Rev. Proc. 2025-32, verify against the IRS newsroom, as brackets adjust for inflation annually):
| Rate | Taxable Income (Single Filer) |
|---|---|
| 10% | $0 – $12,400 |
| 12% | $12,401 – $50,400 |
| 22% | $50,401 – $105,700 |
| 24% | $105,701 – $201,775 |
| 32% | $201,776 – $256,225 |
| 35% | $256,226 – $640,600 |
| 37% | Over $640,600 |
The 2026 standard deduction for single filers is $16,100 (IRS Rev. Proc. 2025-32). A $75,000 salary plus a $10,000 bonus produces taxable income of $68,900, well inside the 22% bracket for a single filer. If the bonus spills across a bracket threshold, only the excess above that line is taxed at the higher rate.
Worked Example: $75,000 Salary + $10,000 Bonus
Scenario: Alex is a single filer earning $75,000 per year, paid biweekly (26 periods). In October 2026, Alex receives a $10,000 performance bonus. No pre-tax benefit deductions for simplicity. Year-to-date regular wages through October: approximately $56,250, well below the Social Security wage base.
True Tax Context First
Before looking at withholding, it helps to know what Alex actually owes on the bonus:
- Annual gross income: $75,000 + $10,000 = $85,000
- Less standard deduction: −$16,100
- Taxable income: $68,900
- Alex's marginal bracket: 22% (the 22% bracket runs to $105,700)
- The bonus does not push Alex into a higher bracket, the full $10,000 is taxed at 22%
- True federal income tax attributable to the bonus: $2,200 (exactly 22%)
Method 1: Flat-Rate Method (Bonus Paid on Separate Check)
| Item | Calculation | Amount |
|---|---|---|
| Federal income tax withheld | 22% × $10,000 | $2,200 |
| Social Security | 6.2% × $10,000 | $620 |
| Medicare | 1.45% × $10,000 | $145 |
| Total withheld | $2,965 | |
| Bonus take-home (flat method) | $7,035 |
The flat method withheld exactly $2,200 in federal income tax, which happens to be precisely what Alex owes on the bonus (22% × $10,000). No over-withholding; no under-withholding. Alex's tax situation is fully squared up, and the refund or balance due at filing is unaffected by the bonus.
Method 2: Aggregate Method (Bonus Added to Regular Paycheck)
Now assume Alex's employer adds the $10,000 bonus to the October biweekly paycheck instead of issuing a separate payment.
- Regular biweekly gross: $75,000 ÷ 26 = $2,884.62
- Combined gross this period: $2,884.62 + $10,000 = $12,884.62
- Annualized: $12,884.62 × 26 = ~$335,000, falls in the 35% bracket
- Federal withholding on the bonus portion: approximately $3,200–$3,500 (varies by W-4 setup)
- FICA is unchanged: $620 SS + $145 Medicare = $765
Strategies to Reduce the Tax Bite
You cannot make bonus income disappear, but you can reduce how much of it is taxable, provided you act before the bonus paycheck processes.
Maximize Your 401(k) Contribution
Traditional (pre-tax) 401(k) contributions reduce your federal and state taxable income dollar for dollar. If you have not yet hit the 2026 employee contribution limit of $24,500 ($32,500 if age 50–59 or 64+; $35,750 if ages 60–63 under SECURE 2.0 super catch-up, verify annually at irs.gov), ask HR to increase your deferral percentage before the bonus paycheck processes.
One important caveat: 401(k) pre-tax contributions reduce income tax but do not reduce FICA taxes (Social Security and Medicare). You will still owe FICA on the full bonus amount.
Contribute to an HSA
If you are enrolled in a qualifying high-deductible health plan, Health Savings Account contributions are triple-tax-advantaged, deductible going in, tax-free for qualified medical expenses, and tax-free in growth. The 2026 contribution limits are $4,400 for self-only coverage and $8,750 for family coverage (verify annually at irs.gov). Payroll-deducted HSA contributions are also FICA-exempt.
Defer the Bonus or Adjust Withholding
If you expect lower income next year, ask whether your employer can pay the bonus in January, this shifts it into the next tax year. After the bonus pays out, check your withholding: if the aggregate method over-withheld significantly, file a new W-4 to reduce withholding for remaining pay periods rather than waiting for a large refund.
Frequently Asked Questions
What percentage of my bonus is taken out for taxes?
At the federal level, employers typically withhold 22% (flat-rate method, if the bonus is paid separately) or a variable amount via the aggregate method. Social Security (6.2%, up to the 2026 wage base of $184,500, verify annually at ssa.gov) and Medicare (1.45%) are also withheld. State income tax adds more depending on your state. Your true tax liability is determined when you file your annual return.
Do bonuses get taxed differently than regular pay?
No, bonuses are ordinary income taxed at the same marginal rates as your regular wages. The difference is in how employers withhold taxes. The IRS allows a flat 22% withholding rate on separately paid bonuses, but this is not a special "bonus tax rate." When you file, bonus income is treated exactly the same as salary.
Is the 22% bonus tax rate always what I'll owe?
Not necessarily. The 22% flat withholding rate is an estimate. Your actual rate depends on your total taxable income. If your total income pushes some of the bonus above the 22% bracket, that portion is taxed at a higher rate. If you're in the 12% bracket, you'll likely get a refund since 22% was withheld but only 12% was owed.
Do I pay Social Security and Medicare taxes on a bonus?
Yes. Bonuses are wages under FICA, so Social Security (6.2%) applies up to the 2026 wage base of $184,500 (verify current year at ssa.gov) and Medicare (1.45%) applies to all bonus income. If you've already hit the SS wage base through your regular salary before the bonus is paid, you won't owe additional SS tax on the bonus. High earners above $200,000 (single) also owe the 0.9% Additional Medicare Tax.
Can I reduce the taxes on my bonus?
You can't avoid the tax, but you can reduce taxable income. The most effective tactic is increasing your 401(k) deferral rate before the bonus paycheck processes, contributions up to the 2026 limit of $24,500 (or $32,500 if age 50+, verify annually at irs.gov) reduce your federal and state taxable income. Maxing out an HSA ($4,400 individual / $8,750 family in 2026, verify annually) also helps. Note: 401(k) pre-tax contributions do not reduce FICA taxes.
What happens if I get a bonus over $1 million?
Supplemental wages above $1,000,000 in a calendar year must be withheld at the mandatory 37% federal rate on the excess. The first $1 million is subject to the flat 22% (or aggregate method) rules. This threshold applies per employer per calendar year.
Does my state also tax my bonus?
Almost certainly yes, if you live in a state with income tax. Most states treat bonuses as ordinary income, withholding at either a flat supplemental rate (e.g., California uses 10.23%, verify current rate with your state's department of revenue) or via the aggregate method. Nine states have no income tax (including Texas, Florida, and Nevada). Check your state's department of revenue for the current withholding rate.
Will receiving a bonus affect my tax refund?
It depends on which withholding method your employer used and your marginal rate. If the flat 22% rate was applied but your marginal rate is 12%, you'll get a larger refund. If the aggregate method over-withheld, you'll also likely get a refund. If your income is high and the bonus pushes you above the 22% bracket, you may owe additional tax when you file. Use the Paycheck Calculator at HRPayCalc to estimate the impact.
Enter your salary, bonus amount, filing status, and state to see your exact withholding breakdown, both flat-rate and approximate aggregate, in seconds.