How to Use This Calculator
- 1
Enter Your Bonus Details
Input your gross bonus amount, annual base income, federal tax rate (default 22% supplemental rate), and any additional withholding as a fixed dollar amount or percentage.
- 2
Review Your Tax Breakdown
The calculator shows three results: estimated take-home after all taxes, total income tax withheld with effective rate, and estimated FICA taxes. The insights card breaks down federal tax, additional withholding, and your effective total rate.
Example Calculation
A software engineer with a $75,000 annual income receives a $5,000 bonus and wants to understand the net amount after federal income tax at 22% and a $200 flat additional withholding.
Bonus Amount
5,000
Annual Base Income
75,000
Federal Tax Rate
22
Additional Withholding Type
Fixed Dollar Amount ($)
Additional Withholding
200
Results
Est. Take-Home After All Taxes
$3,317.50
Total Tax Withheld (Income)
$1,300
Est. FICA Taxes
$382.50
Insights card shows federal tax of $1,100 at 22%, $200 flat additional withholding, net bonus before FICA of $3,700, and 33.
Tips
Removing Additional Withholding Saves $200
With a $5,000 bonus at 22% and no additional withholding, your take-home rises from $3,317.50 to $3,517.50. Only add extra withholding if you expect to owe at filing time.
A $10,000 Bonus Loses $2,965 to Taxes
On a $10,000 bonus at 22% with $75,000 income and no additional withholding, federal tax is $2,200 and FICA adds $765, leaving you $7,035. FICA alone costs 7.65% of each bonus dollar.
Switching to 10% Additional Withholding Costs $300 More
Changing from $200 flat to 10% additional on a $5,000 bonus increases total income tax withheld from $1,300 to $1,600 -- an extra $300. Your take-home drops from $3,317.50 to $3,017.50.
Higher Income Means Higher FICA on Large Bonuses
A $15,000 bonus with $100,000 income and $500 additional withholding yields $10,052.50 take-home. The $1,147.50 in FICA includes $930 for Social Security and $217.50 for Medicare.
The Bonus Tax Calculator estimates federal income tax, FICA contributions, and additional withholding on your bonus to show your actual take-home amount.
On a $5,000 bonus at the standard 22% supplemental rate with $200 additional withholding, total taxes come to $1,682.50 -- leaving you $3,317.50.
Bonus Tax Formulas
The calculator applies three layers of taxation to your gross bonus:
Federal Tax = Bonus Amount x (Tax Rate / 100)
Additional Withholding = Fixed $ amount OR Bonus x (Additional % / 100)
Total Income Tax = Federal Tax + Additional Withholding
FICA is calculated separately:
Social Security = min(Bonus, max(0, $168,600 - Annual Income)) x 6.2%
Medicare = Bonus x 1.45%
Additional Medicare = (Annual Income + Bonus - $200,000) x 0.9% [if applicable]
Take-Home = Bonus - Total Income Tax - FICA
For a $10,000 bonus at 22% with 5% additional withholding and $75,000 annual income: federal tax is $2,200, additional withholding is $500, FICA is $765, and take-home is $6,535.
Example: Performance Bonus Breakdown
| Input | Value |
|---|---|
| Bonus Amount | $10,000 |
| Federal Tax Rate | 22% |
| Additional Withholding | 5% of bonus |
| Annual Income | $75,000 |
| Tax Component | Amount |
|---|---|
| Federal Income Tax | $2,200 |
| Additional Withholding | $500 |
| Social Security (6.2%) | $620 |
| Medicare (1.45%) | $145 |
| Total Taxes | $3,465 |
| Take-Home | $6,535 |
The effective total tax rate on this bonus is 34.65%.
Supplemental Wage Withholding Rules
The IRS classifies bonuses as supplemental wages, with two withholding methods:
- Percentage method: Flat 22% on supplemental wages up to $1 million. Above $1 million, the mandatory rate is 37%.
- Aggregate method: Combines bonus with regular pay for the period and withholds based on the total, often resulting in higher initial withholding.
Both methods are for withholding purposes only -- your actual tax liability is determined when you file your return.
Over-withheld amounts are refunded; under-withheld amounts are owed.
Many states add their own withholding on bonuses, ranging from 0% (Florida, Texas) to over 10% (California, New York).
Frequently Asked Questions
How does the calculator determine federal tax on my bonus?
It multiplies your bonus amount by the federal tax rate. For example, a $5,000 bonus at 22% yields $1,100 in federal tax. Any additional withholding (flat dollar or percentage) is added on top: with $200 extra, total income tax withheld becomes $1,300 and effective withholding rate is 26%.
What FICA taxes apply to my bonus?
FICA includes Social Security (6.2% up to the $168,600 wage base) and Medicare (1.45%). On a $5,000 bonus with $75,000 annual income, Social Security tax is $310 and Medicare is $72.50, totaling $382.50. If your combined income exceeds $200,000, an additional 0.9% Medicare tax applies.
Why does my bonus seem taxed higher than my regular pay?
The IRS allows employers to withhold a flat 22% on supplemental wages up to $1 million, regardless of your marginal bracket. With a $5,000 bonus at 22% plus $200 additional withholding, the effective income tax rate is 26% -- plus 7.65% FICA brings total estimated taxes to 33.7%.
What is the difference between the percentage method and aggregate method?
The percentage method applies a flat 22% to the bonus separately. The aggregate method combines the bonus with regular wages for the pay period and withholds based on the combined total, often resulting in higher withholding. This calculator uses the percentage method by default.
How can I reduce the tax impact of a large bonus?
Maximize pre-tax contributions: increasing 401(k) or HSA contributions in the bonus pay period reduces taxable income. On a $10,000 bonus, redirecting $3,000 to a 401(k) means only $7,000 is subject to the 22% rate -- saving $660 in federal tax compared to the full $2,200.
What happens if supplemental wages exceed $1 million?
The IRS requires a mandatory 37% withholding rate on supplemental wages above $1 million. For example, a $50,000 bonus taxed at 37% with $1.2M annual income would have $18,500 in federal tax withheld, plus FICA, leaving roughly $31,500 before FICA deductions.