Bonus Tax Calculator
Calculate bonus tax withholding using IRS flat 22% method vs aggregate method. See federal, FICA, state withholding, net bonus, and year-end tax true-up estimate.
For year-end true-up estimate
Gross Bonus
$10,000.00
Total Withheld
$3,988.00
Net Bonus
$6,012.00
Effective Withholding
39.9%
Withholding Breakdown (Flat 22% Method)
Method Comparison
| Method | Federal Withheld | Total Withheld | Net Bonus | Effective % |
|---|---|---|---|---|
| Flat 22% | $2,200.00 | $3,988.00 | $6,012.00 | 39.9% |
| Aggregate | $2,841.36 | $4,629.36 | $5,370.64 | 46.3% |
Year-End Tax True-Up Estimate
Withholding is just a prepayment. Your actual tax owed is your marginal rate × the bonus. The difference is refunded (or owed) at filing.
- Withheld (flat method)$3,988.00
- Estimated actual tax owed (marginal 22% + FICA + state)$3,988.00
- Estimated true-up at filing$0.00 (owe)
U.S. Bonus Tax Statistics 2026
22%
flat federal supplemental wage withholding rate for bonuses up to $1 million in 2026 (IRS Publication 15, Section 7)
$176,100
2026 Social Security wage base — bonuses paid after this YTD threshold are exempt from the 6.2% SS portion (SSA)
$2,503
average year-end bonus paid by U.S. employers in 2025 (Bureau of Labor Statistics, Employer Costs for Employee Compensation)
The Salario Bonus Tax Calculator implements both IRS withholding methods exactly as specified in Publication 15 (Circular E). The flat method is simple and predictable: 22% federal on the first $1 million, 37% above. The aggregate method combines your bonus with your regular paycheck and uses your W-4 brackets — this typically over-withholds because the spike pushes you into higher brackets. Use the calculator above to compare both and pick your election if your employer offers a choice. For full salary modeling, see our Salary Calculator, Bonus Calculator, and Net Pay Calculator.
How Bonus Tax Withholding Works
The IRS classifies bonuses, commissions, severance, retroactive pay, and certain awards as "supplemental wages." These are subject to special withholding rules in IRS Publication 15 (Circular E), which differ from regular wage withholding. Employers may use one of two methods:
| Method | How It Works | Typical Result |
|---|---|---|
| Flat Rate Method | Bonus is paid as a separate check or identified separately. Employer withholds exactly 22% federal (37% if YTD supplemental wages exceed $1M). | Predictable. Over-withholds for low brackets (10-12%), under-withholds for high brackets (32%+). |
| Aggregate Method | Bonus is added to your regular paycheck. Withholding is computed as if you earn that combined amount every pay period, using your W-4 brackets. | Almost always higher withholding — the spike temporarily treats you as a much higher earner. Refunded at filing. |
On top of federal income tax, all bonuses are subject to FICA (Social Security 6.2% up to the $176,100 wage cap, and Medicare 1.45% with no cap, plus 0.9% Additional Medicare on wages over $200,000 YTD). State tax adds 0-13% depending on your state. Total withholding for a typical $10,000 bonus in California: $2,200 federal + $620 SS + $145 Medicare + $1,023 state = $3,988 (39.9%), leaving ~$6,012 net.
Critical distinction: withholding is not your final tax. The flat 22% is a convenience number — your actual tax owed at year-end depends on your marginal rate. If your bracket is 12%, you over-paid 10% on the bonus, refunded at filing. If your bracket is 32%, you under-paid 10%, and you owe at filing.
Flat Method vs. Aggregate Method: Worked Example
Consider a $75,000/year bi-weekly worker (~$2,884/paycheck) receiving a $10,000 bonus. Their actual marginal federal rate is 22% (since the bonus pushes total income to $85,000, just over the 22% bracket cutoff of $48,475-$103,350).
| Component | Flat Method | Aggregate Method |
|---|---|---|
| Federal Income Tax Withheld | $2,200 (22% flat) | $2,800-$3,200 (annualized brackets) |
| FICA (SS 6.2% + Medicare 1.45%) | $765 | $765 |
| State (CA 10.23%) | $1,023 | $1,023 |
| Total Withheld | $3,988 | $4,588 - $4,988 |
| Net Bonus Received | $6,012 | $5,012 - $5,412 |
| Year-End True-Up | ~$0 (close to actual 22%) | +$600-$1,000 refund |
The flat method gives you more cash today; the aggregate method gives you more cash at filing. Total tax owed is identical — only the timing differs. If you prefer maximum cash now and your marginal rate is below 22%, ask payroll to use the flat method. If you prefer a forced savings mechanism, the aggregate method works.
State-Specific Bonus Tax Treatment
State income tax adds 0-13% on top of federal and FICA. Some states (CA, GA, NY, OH) have a designated supplemental wage rate distinct from regular brackets. Others (FL, TX, TN, NV, WA, AK, SD, WY, NH for wages) have no income tax, making bonuses 5-13% more valuable than the same dollar in California.
| State | Supplemental Rate | Net on $10K Bonus* |
|---|---|---|
| No-tax states (FL, TX, NV, WA, etc.) | 0% | $7,035 |
| Pennsylvania | 3.07% | $6,728 |
| Illinois | 4.95% | $6,540 |
| New York | 11.7% (NYC: 14.7%) | $5,865 ($5,565 NYC) |
| California | 10.23% | $6,012 |
| New Jersey | 10.75% | $5,960 |
| Hawaii | 11.0% | $5,935 |
* Assumes flat 22% federal + 7.65% FICA + state. Actual net varies with YTD wages and Additional Medicare. The difference between Texas and Hawaii on the same $10,000 bonus is over $1,100 in net pay.
Bonuses Above $1 Million: The Mandatory 37% Rule
Per IRS rules, supplemental wages exceeding $1 million in a single calendar year are subject to mandatory 37% federal withholding on the amount above $1 million, regardless of W-4 elections. The first $1 million can still use the 22% flat method.
Example: an executive receiving a $1,500,000 bonus has the first $1,000,000 withheld at 22% ($220,000) and the remaining $500,000 withheld at 37% ($185,000), for a total federal withholding of $405,000 (27% effective). FICA Social Security stops at $176,100 YTD wages, but Medicare 1.45% + 0.9% Additional Medicare apply to the full bonus with no cap.
This rule mainly affects executive cash bonuses, large signing bonuses in finance and tech, and equity vesting events that pay out as ordinary income. RSU vesting is treated as supplemental wage income and follows the same withholding rules.
Strategies to Reduce Bonus Tax Impact
- Maximize 401(k) on the bonus paycheck: Many employers allow you to elect a higher 401(k) contribution percentage on bonus checks. Contributing up to 100% of the bonus (subject to the $24,500 annual limit, $32,500 if 50+) defers federal and state income tax. FICA still applies.
- Top off your HSA: If you have an HSA-eligible high-deductible health plan, an HSA contribution from the bonus avoids federal, FICA, and state tax (in most states). 2026 limits: $4,400 self-only, $8,750 family, +$1,000 catch-up if 55+.
- Time the bonus to a low-income year: If you can defer the bonus into a year when you have lower expected income (sabbatical, parental leave, partial-year employment), you may save 5-15% in federal tax.
- Charitable contributions: A bonus year is a good time to bunch charitable contributions and itemize deductions. Donor-advised funds let you take the deduction now and distribute later.
- Choose flat method if your bracket is below 22%: If your true marginal rate is 10% or 12%, the aggregate method will withhold even more than 22% — the flat method gives you cash sooner. Ask payroll about your election options.
- State residency planning: If you anticipate a large bonus and have flexibility (remote work), consider establishing residency in a no-income-tax state before the bonus is paid. Document your move thoroughly to avoid state tax claims.
For broader compensation modeling — including base salary impact, raise comparisons, and total comp evaluation — see our Salary Calculator, Raise Calculator, and Net Pay Calculator. For sales-based variable comp, the Commission Calculator applies the same supplemental wage rules used here.
Frequently Asked Questions
What is the bonus tax rate in 2026?
There is no special "bonus tax rate" — bonuses are taxed at your regular income tax rates. However, the IRS requires special withholding rules for supplemental wages. Under the flat method, employers withhold 22% federal tax on bonuses up to $1 million (37% on amounts above $1M), plus 7.65% FICA and any state tax. Total flat-method withholding for most workers is ~30-40% depending on state. The withholding is reconciled against your actual marginal tax rate at year-end.
What is the difference between the flat method and the aggregate method?
The flat method (IRS Publication 15, Section 7) withholds a flat 22% federal tax on the bonus, separate from your regular paycheck. The aggregate method combines the bonus with your regular paycheck and calculates withholding as if you earn that combined amount every pay period. The aggregate method usually withholds MORE because the larger paycheck temporarily pushes you into higher brackets for withholding purposes. The excess is refunded at tax time.
Why does my bonus check feel like 40% goes to taxes?
Because typical withholding on a bonus is: 22% federal flat + 7.65% FICA + 5-10% state = 35-40% total. This is withholding, not your final tax bill. If your actual marginal rate is only 12% (income $11,925-$48,475 single), you are over-withheld and will receive a refund. If your marginal rate is 32%+ ($197,301+), you may be under-withheld on federal and owe at filing. State withholding is usually closer to your true state rate.
Can I lower the tax withholding on my bonus?
Some options: (1) Ask your employer to use the flat method instead of aggregate if your bracket is below 22%, (2) Increase your 401(k) contribution percentage on the bonus paycheck to reduce taxable income (subject to the $24,500 annual cap, $32,500 if 50+), (3) Maximize HSA contributions if eligible, (4) Time the bonus to a year with lower expected income if possible. Note: FICA still applies even on 401(k) and HSA-deferred bonus amounts.
Is the bonus tax different if I make over $1 million?
Yes. Per IRS rules, supplemental wages exceeding $1 million in a calendar year are subject to mandatory 37% federal withholding (the top marginal rate), regardless of W-4 elections. The first $1 million can still use the 22% flat method. This affects executive bonuses, large signing bonuses, and equity vest events. FICA Social Security stops applying above the $176,100 wage cap, but Medicare (1.45% + 0.9% additional over $200K) continues with no cap.
How does my state affect bonus tax withholding?
State tax adds 0-13% on top of federal and FICA. Nine states have no income tax (TX, FL, NV, WA, AK, SD, TN, WY, NH for wages). High-tax states like California (10.23% bonus rate), New Jersey (10.75%), Hawaii (11%), and Oregon (9.9%) significantly reduce net bonus. Some states (CA, GA, NY) require a flat supplemental wage rate distinct from regular tax brackets. The calculator above includes state-specific rates.
When will I get the over-withheld bonus tax back?
When you file your tax return for the year the bonus was paid. If you received a $20,000 bonus in 2026, file your 2026 federal return by April 15, 2027 and any over-withholding will be refunded (typically within 21 days of e-filing). If you want the money sooner, you can adjust your W-4 to reduce withholding on your remaining 2026 paychecks, but this requires accurate forecasting of total annual income.
Are signing bonuses taxed differently than performance bonuses?
No — the IRS treats all bonuses as supplemental wages with the same withholding rules. However, signing bonuses often come with a clawback clause requiring repayment if you leave within 1-2 years. The clawback is typically based on the gross bonus amount even though you received only the net. If you have to repay in a different tax year than you received the bonus, you may need to file an IRC Section 1341 claim of right deduction or amend the original return.