Bonus After-Tax Calculator
See what's actually withheld from your bonus versus what you truly owe on it, based on your real marginal tax bracket.
Your Bonus, After Tax
Bonus Amount You'll See in Your Paycheck
$6,535
Your employer withholds federal tax on bonuses at a flat 22% (the IRS supplemental wage rate), regardless of your actual tax bracket. Based on your real salary and bracket, you actually owe about $2,200 in federal tax on this bonus — more than the $2,200 withheld, so you'll owe about $0 more at tax filing time.
What Is the Bonus After-Tax Calculator?
A lot of people see a much smaller bonus than expected hit their bank account and conclude bonuses are taxed at some punitive special rate — they're not. What actually happens is a withholding quirk: the IRS lets employers withhold federal tax from bonuses (a type of "supplemental wage") at a flat 22% rate, regardless of your actual tax bracket, instead of running it through the normal payroll withholding tables. That flat rate is just a prepayment estimate, not your real tax bill — at filing time, the bonus is simply added to your regular income and taxed at your real marginal rate based on your total annual earnings. This calculator shows both numbers side by side: what actually gets withheld from your bonus paycheck, and what you truly owe on it.
Whether the flat 22% withholding over- or under-covers your real tax depends entirely on your income level: if your marginal tax bracket is below 22%, the withholding likely overshoots and you'll get some of it back as part of your refund; if your bracket is above 22%, the withholding falls short and you'll owe the difference when you file.
For how this fits into your broader paycheck picture, see the Take-Home Pay After Benefits Calculator.
Bonus After-Tax Calculator Formula
Federal Withheld = Bonus × 22% (37% on the portion over $1,000,000)
Actual Tax on Bonus = Tax(Salary + Bonus) − Tax(Salary Alone)
Refund or Owed = Federal Withheld − Actual Tax on Bonus
How Is the Bonus After-Tax Calculator Calculated?
The actual federal tax attributable to your bonus is found by calculating your total tax with the bonus included, then subtracting your tax on just your regular salary — the difference is what the bonus itself actually added to your tax bill, correctly reflecting that it "stacks" on top of your regular income at whatever bracket that places it in. Social Security and Medicare tax apply to the bonus exactly like regular wages, with Social Security capped once your total wages for the year (salary plus bonus) reach the annual wage base.
The 22% flat withholding rate applies to the first $1,000,000 of supplemental wages (bonuses, commissions, and similar) an employee receives in a calendar year; a 37% rate applies to any amount above that. Some employers instead use the "aggregate method" (adding the bonus to your most recent regular paycheck and withholding as if that combined amount were your normal pay), which typically withholds even more than the flat 22% method — this calculator models the more common flat-rate method.
Bonus After-Tax Calculator Example
A $70,000 salary with a $10,000 bonus (Single, 5% state): the bonus lands entirely within the same 22% bracket the salary is already in, so the flat 22% withholding ($2,200) matches the actual federal tax owed exactly — no surprise either way.
A more modest $35,000 salary with a $5,000 bonus (Single, no state tax): the person's real marginal bracket is only 12%, so the flat 22% withholding ($1,100) significantly overshoots the actual $600 owed — about $500 comes back as part of their refund.
A high earner on $250,000 salary with a $50,000 bonus (Single, 6% state) is already in the 35% bracket — the flat 22% withholding ($11,000) falls well short of the actual $16,830 owed, leaving roughly $5,830 to pay at filing time.
How to Use the Bonus After-Tax Calculator
Step 1
Enter your annual regular salary.
Step 2
Enter the bonus amount.
Step 3
Select your filing status and enter an estimated state tax rate.
Step 4
Compare what gets withheld from the bonus against what you actually owe on it.
Benefits
- Clarifies the difference between bonus withholding and actual bonus tax liability — a frequent source of confusion.
- Uses the actual 2026 federal brackets to compute what you truly owe, not just a flat-rate guess.
- Applies the correct Social Security wage-base interaction between salary already earned and the bonus.
- Shows whether you should expect a refund credit or an amount owed at filing because of this specific bonus.
- Free, instant, and runs entirely in your browser.
Common Bonus After-Tax Calculator Scenarios
Scenario 1
Understanding why a bonus paycheck looks smaller than expected.
Scenario 2
Planning whether to adjust withholding elsewhere after a large bonus.
Scenario 3
Comparing the real after-tax value of a bonus offer against a salary increase.
Scenario 4
Explaining to a coworker why bonuses aren't taxed at a special punitive rate.
Scenario 5
Estimating year-end tax impact after receiving a mid-year or year-end bonus.
Understanding Your Result
"Net Bonus in Paycheck" is what actually lands in your bank account after your employer's standard bonus withholding — federal, FICA, and an estimated state amount. "Actual Federal Tax Owed on Bonus" is what your bonus really costs you in federal tax once your whole year's income is considered, which is the number that determines whether the flat withholding over- or under-covered your real liability.
A "refund" result doesn't arrive separately just for the bonus — it shows up as part of your overall tax refund (or reduced balance due) when you file your full return, combined with all your other income, withholding, and deductions for the year.
Tips
- If you're in a tax bracket above 22%, consider setting aside extra from a bonus rather than spending the full net amount, since you'll likely owe more at filing time.
- If your bracket is below 22%, the extra withholding isn't lost — it comes back as part of your refund, but you also lose the use of that cash until you file.
- You can request your employer withhold at a higher rate on bonuses using Form W-4, if you'd rather avoid an under-withholding surprise.
- Some employers use the aggregate withholding method instead of the flat 22% rate — check your specific pay stub to see which method applies to you.
- A bonus late in the year can push your total wages past the Social Security wage base, meaning that portion of the bonus avoids the 6.2% Social Security tax specifically.
Common Mistakes
- Believing bonuses are taxed at a special, higher permanent rate rather than understanding the 22% figure is just a withholding shortcut, not your actual tax rate.
- Assuming the amount withheld from a bonus paycheck is exactly what you owe on it, rather than a rough prepayment that reconciles at filing.
- Spending an entire bonus without setting anything aside when your marginal tax bracket is well above 22%.
- Forgetting FICA tax still applies fully to bonuses, on top of federal and state income tax.
- Not accounting for how a bonus combined with regular salary can push total income into a materially higher bracket for that portion of income.
Frequently Asked Questions
Why does my bonus paycheck seem to have such a huge chunk of tax taken out?
Employers commonly withhold a flat 22% for federal tax on bonuses (the IRS supplemental wage rate), on top of standard FICA and any state tax — that combined withholding can look large, but it's a prepayment estimate, not necessarily your final tax rate on that money.
Is 22% my actual tax rate on my bonus?
Not necessarily — 22% is just the standard federal withholding rate employers commonly use for bonuses. Your true tax liability depends on your actual marginal tax bracket once the bonus is added to your regular income, which could be higher or lower than 22%.
What is the "aggregate method" for bonus withholding?
It's an alternative approach some employers use, where the bonus is added to your most recent regular paycheck and withholding is calculated as if that combined amount were your normal pay for the period, then annualized — this often results in higher withholding than the flat 22% method, especially for lower and middle earners.
Does Social Security tax apply to bonuses?
Yes, at the same 6.2% rate as regular wages, up to the annual Social Security wage base ($184,500 for 2026) — if your regular salary alone already reaches that cap, none of your bonus would be subject to additional Social Security tax.
What happens to bonuses over $1,000,000?
The portion of your total supplemental wages (bonuses, commissions, etc.) above $1,000,000 in a calendar year is withheld at 37% federal, rather than the standard 22% flat rate.
Will I get money back if my bonus was over-withheld?
Yes — any excess withholding across your entire year (not isolated to just the bonus) is reflected in your overall tax refund or reduced balance due when you file your return.
Does this calculator account for 401(k) contributions taken from my bonus?
No — if your employer also withholds a 401(k) contribution from your bonus, that would reduce the taxable amount and change these figures. This calculator assumes the full bonus amount is subject to standard withholding.
Can my employer choose either withholding method?
Yes — employers generally have discretion between the flat percentage method and the aggregate method for supplemental wages like bonuses, within IRS guidelines. Check your pay stub or ask your payroll department which method applies to you.
Does a bonus affect my tax bracket for my regular paychecks too?
No — your bracket is determined by your total annual income, not by which specific paycheck the money came from. This calculator reflects that by combining salary and bonus to find your real marginal impact.
Should I ask my employer to withhold extra from my bonus?
If you're confident your marginal tax rate is well above 22% and you'd rather not owe a lump sum at filing time, requesting additional withholding (via Form W-4) is a reasonable way to smooth that out — otherwise, many people are comfortable settling the difference when they file.
Does state tax on bonuses work the same way as federal?
Some states have their own supplemental wage withholding rules that may differ from the federal 22% approach; this calculator applies a simple flat rate estimate to the bonus for state tax rather than modeling state-specific supplemental wage rules.
Can I share my bonus after-tax result as an image?
Yes — tap Share and, on supported devices, your result is shared as a branded image card, not just a text link.
References
Important Information
This calculator provides estimates for informational purposes only and is not tax, legal, or financial advice. Uses 2026 IRS federal tax brackets and the standard 22%/37% supplemental wage withholding rates; actual employer withholding may use the aggregate method instead, producing different results. Confirm your specific situation with a qualified tax professional.
Last updated: August 2026