Bonus Tax Calculator
Calculate your estimated net take-home bonus pay using 2026 IRS rules. Compare Percentage and Aggregate withholding methods, and estimate your tax return refund.
Receiving a bonus is always exciting, but seeing the tax withholding on your check can be a surprise. The IRS classifies bonuses as **supplemental wages**, which are subject to different tax withholding rules than your standard paychecks. Most employers use the **Percentage Method**, applying a flat 22% federal tax withholding rate to your bonus. If your employer uses the **Aggregate Method** instead, the withholding can be even higher because it simulates a temporarily higher tax bracket. Furthermore, standard FICA payroll taxes apply, but they are limited by annual wage base caps (for 2026, Social Security taxes cease after $184,500 in total wages). Use this calculator to estimate your actual net take-home bonus, FICA tax allocations, state withholding rates, and discover if you will receive a tax refund at the end of the year.
Net Bonus Take-Home: $6,012.00
You keep 60.1% of your gross bonus. Total withholdings (federal, state, and payroll taxes) consumed $3,988.00.
Bonus & Salary Settings
$10,000.00
$3,988.00
60.1%
withholding vs. actual tax liability
Your federal withholding matches your actual tax bracket rate. No major refund or tax liability adjustments are expected.
This comparison assumes you claim the standard deduction and have no other income adjustments.
Gross Pay allocation
Bonus Withholding Statement
Estimated Pay stub| Pay Check Item | Withholding Method / Rates | Amount |
|---|---|---|
| Gross Bonus Pay | — | $10,000.00 |
| Social Security withholding | 6.2% on taxable base of $10,000.00 | −$620.00 |
| Medicare withholding | 1.45% base rate | −$145.00 |
| Federal Tax Withholding | Flat 22% rate | −$2,200.00 |
| State Tax Withholding | CA flat 10.23% rate | −$1,023.00 |
| Total Tax & Deductions | −$3,988.00 | |
| Net Bonus Take-Home Pay | Total paycheck allocation | $6,012.00 |
How Supplemental Withholding Methods Differ
Payroll departments calculate bonus withholding using one of two primary methods approved by the IRS:
1. The Percentage Method (Flat Rate)
This is the most common method. If your bonus is paid separately from your regular paycheck (or identified separately on the same paystub), your employer will apply a flat **22%** federal withholding rate.
Example: On a $5,000 bonus, exactly $1,100 is withheld for federal income tax, regardless of your standard income tax bracket.
2. The Aggregate Method (Bracket Rate)
If your employer adds the bonus to your regular paycheck, they calculate withholding by treating the total sum as your regular wages for the period. Because the system assumes you make this higher amount on every paycheck, it pushes you into a temporarily higher tax bracket, resulting in higher withholding.
Example: Adding a $5,000 bonus to a bi-weekly paycheck might withhold federal taxes as if your annual salary is $150,000 higher, inflating the tax rate.
2026 FICA Caps and Thresholds
Just like standard wages, bonuses are subject to FICA (Federal Insurance Contributions Act) payroll taxes. However, the calculation changes if you are a high-income earner:
- Social Security Tax Cap ($184,500 in 2026): Social Security (6.2%) is only paid on the first $184,500 of combined wages in a calendar year. If your regular salary is $180,000 and you receive a $10,000 bonus, only the first $4,500 of the bonus is taxed for Social Security. If your salary is already $184,500 or higher, the bonus is completely exempt from Social Security tax.
- Medicare Tax (1.45%): Standard Medicare tax has no wage cap and applies to all wages.
- Additional Medicare Tax (0.9%): An additional 0.9% tax applies to cumulative wages exceeding $200,000 for single filers or $250,000 for married couples filing jointly. The calculator models this threshold interaction dynamically based on your filing status.
Withholding Tax vs. Actual Tax Liability
One of the most important concepts to understand is that **tax withholding is not the same as your actual tax liability**.
When your employer withholds 22% federal tax on your bonus, they are simply sending a deposit to the IRS. When you file your annual tax return, the IRS adds your regular salary and your bonus together, subtracts your deductions, and calculates your final tax based on your actual progressive brackets.
💡 Tax Refund Opportunities & Deficits
- Refund Case: If your actual marginal tax rate is 12% (taxable income below $50,400 for single filers in 2026), but your employer withheld 22% from your bonus, you overpaid by 10%. You will get this 10% back as a tax refund when you file.
- Balance Due Case: If your actual marginal tax rate is 24% or higher, the flat 22% withholding was not enough. You will owe the remaining difference when you file.
State Supplemental Withholding Flat Rates
If you reside in a state with an income tax, your state also has specific withholding guidelines for supplemental wages:
| State | Supplemental Withholding Rate | Application Notes |
|---|---|---|
| California | 10.23% | A flat rate applied to bonuses and stock options. (Other supplemental wages like overtime are 6.6%). |
| New York | 11.70% | Flat supplemental state rate. Additional local city taxes (NYC/Yonkers) may apply. |
| Illinois | 4.95% | Standard state flat income tax rate, also applied to supplemental wages. |
| Texas / Florida | 0% | No state personal income tax. |
Frequently Asked Questions
Why are bonuses taxed differently than regular pay?
Under IRS rules, bonuses are classified as 'supplemental wages'. Because they are paid in addition to your regular salary, employers must withhold taxes using separate guidelines (typically a flat 22% rate) rather than standard paycheck progressive withholding. However, on your annual tax return, bonuses are taxed as ordinary income at your regular marginal rate.
What is the flat tax rate for bonuses?
For the 2026 tax year, the federal flat supplemental withholding rate is 22% on bonuses under $1 million. For the portion of supplemental wages that exceeds $1 million, the withholding rate is 37%.
What is the difference between the Percentage and Aggregate methods?
The Percentage Method applies a flat 22% federal tax withholding directly to the bonus. The Aggregate Method combines the bonus with your regular paycheck and calculates withholding based on your total earnings for that pay period. The aggregate method often results in higher withholding because it temporarily pushes you into a higher tax bracket for that check.
Is FICA tax paid on bonuses?
Yes. Standard FICA payroll taxes (6.2% Social Security and 1.45% Medicare) apply to bonuses. However, if your regular annual salary already exceeds the 2026 Social Security wage base limit of $184,500, no Social Security tax will be withheld from your bonus.
Do pre-tax deductions like 401(k) reduce the tax on my bonus?
If your employer allows it, contributing to a pre-tax traditional 401(k) or HSA from your bonus will reduce the amount of federal and state income tax withheld. However, pre-tax deductions do not reduce FICA (Social Security and Medicare) taxes.
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Official IRS Publications & Payroll Standards
Calculations are based on 2026 IRS tax tables, Social Security caps, and state withholding parameters. Consult a tax professional for detailed planning.