Calculate Federal Withholding On Bonus

Estimate how much federal income tax may be withheld from a bonus, commission, retro pay, award, or other supplemental wage. This calculator supports both the IRS percentage method and an aggregate estimate based on filing status, pay frequency, and annual wages.

How to calculate federal withholding on bonus pay

When you receive a bonus, your employer does not simply guess the tax amount. Bonus pay is usually treated as a form of supplemental wage for federal income tax withholding purposes. That category often includes bonuses, commissions, overtime paid separately, retroactive pay increases, awards, taxable fringe benefits, severance in some situations, and certain other one-time or irregular compensation items. The withholding method your employer uses can change the amount taken out of the payment, even if your final tax liability for the year ends up being different when you file your return.

The two most common approaches are the percentage method and the aggregate method. Under the percentage method, federal income tax is commonly withheld at a flat 22% rate on supplemental wages up to the applicable threshold. If supplemental wages paid to an employee exceed $1 million during the calendar year, the excess is generally subject to withholding at the highest federal income tax rate, currently 37%. Under the aggregate method, the employer combines the bonus with regular wages for the payroll period and determines withholding as though the total were a single wage payment. That can produce a higher or lower result than the 22% flat rate, depending on your pay level, filing status, pay frequency, and Form W-4 settings.

This calculator helps you estimate both pathways. If you choose the percentage method, the math is straightforward and closely tracks the standard IRS approach for many payroll systems. If you choose the aggregate estimate, the calculator annualizes income based on pay frequency and uses current tax bracket logic to estimate how much extra withholding is generated by adding the bonus to a pay period. That is useful when your bonus is paid together with your regular paycheck or when your employer prefers the aggregate method. Because payroll systems can incorporate Form W-4 details, credits, and adjustments in a more granular way, aggregate results here should be treated as an informed estimate rather than a payroll-engine exact figure.

Why the tax on your bonus can feel higher than expected

Many employees say, “My bonus was taxed at 40%.” In most cases, what they are really noticing is total withholding, not actual federal income tax owed. Several separate deductions can come out of a bonus payment:

• Federal income tax withholding
• Social Security tax, subject to the annual wage base
• Medicare tax, plus Additional Medicare Tax for higher earners where applicable
• State income tax withholding, if your state imposes one
• Retirement plan contributions or other pretax deductions
• Post-tax deductions, such as wage garnishments or benefits

This page focuses on federal income tax withholding on the bonus itself. It does not include FICA taxes or state withholding in the displayed result. That distinction matters because withholding is not the same as final tax. If too much is withheld over the course of the year, you may recover some of it as a refund when you file. If too little is withheld, you may owe additional tax at filing time.

Percentage method versus aggregate method

The percentage method is the easiest way to calculate federal withholding on bonus pay. For most bonuses under the threshold, the formula is simply:

1. Start with the gross bonus.
2. Subtract any pretax deductions that apply to the payment.
3. Apply 22% federal withholding to the taxable portion.
4. If year-to-date supplemental wages plus the current bonus exceed $1 million, apply 37% to the excess over $1 million.
5. Add any extra withholding requested on Form W-4 or through payroll.

The aggregate method is more nuanced. Payroll combines your bonus with regular wages in the current pay period, computes withholding on the total, then subtracts the withholding attributable to the regular wages alone. The difference represents the bonus-related withholding. This can lead to a result above 22% for employees whose annualized income pushes into higher tax brackets, or below 22% in lower-income situations. In practical terms, the aggregate method often feels less predictable because it depends on the timing of the payment and the details of your ongoing payroll setup.

Method	How it works	Best for	Typical employee experience
Percentage method	Applies a flat 22% federal withholding rate to most supplemental wages, with 37% on excess over $1 million.	Standalone bonus checks and straightforward payroll processing.	Easy to understand, quick to estimate, and common for one-time bonuses.
Aggregate method	Combines bonus and regular pay for the period, then computes withholding on the total amount.	Bonuses paid with regular wages or payroll systems using one blended withholding calculation.	Can create withholding above or below 22% depending on annualized income.

Federal rates and thresholds that matter

For many employees, the key number is 22%. That is the common flat withholding rate for supplemental wages paid separately from regular wages when the amount is under the high-income threshold. The second critical number is 37%, the highest federal income tax rate used when supplemental wages paid to an employee exceed $1 million during the year. The IRS treatment is not a special “bonus tax”; instead, it is a withholding rule intended to collect enough tax during the year on irregular pay.

Below is a simple reference table that captures the main federal withholding framework relevant to bonuses. These are withholding mechanics, not a complete summary of all payroll taxes or individual tax return outcomes.

Federal rule or statistic	Current figure	Why it matters for bonus withholding	Source type
Standard supplemental wage withholding rate	22%	Often used for bonuses, commissions, and other supplemental wages paid separately from regular pay.	IRS guidance
Highest mandatory withholding rate on excess supplemental wages	37%	Applies to supplemental wages over $1,000,000 in a calendar year.	IRS guidance
Threshold for mandatory highest-rate withholding	$1,000,000	Crossing this threshold changes the treatment of the excess amount.	IRS guidance
2024 standard deduction, Single	$14,600	Relevant for aggregate-style annual tax estimates.	IRS annual adjustment
2024 standard deduction, Married Filing Jointly	$29,200	Relevant for aggregate-style annual tax estimates.	IRS annual adjustment
2024 standard deduction, Head of Household	$21,900	Relevant for aggregate-style annual tax estimates.	IRS annual adjustment

Step-by-step example using the percentage method

Suppose you receive a $10,000 bonus and have no pretax deductions applied to that payment. Your employer has already withheld federal tax from your normal paychecks, and your year-to-date supplemental wages before this payment are $0. Using the percentage method, the federal withholding estimate is:

1. Gross bonus: $10,000
2. Pretax deductions: $0
3. Taxable supplemental wage: $10,000
4. Federal withholding at 22%: $2,200
5. Estimated net bonus before other taxes and deductions: $7,800

Now imagine you are an executive who has already received $995,000 in supplemental wages earlier in the year and now receives another $20,000 bonus. The first $5,000 of that payment keeps total supplemental wages at $1,000,000, so that portion may still be withheld at 22%, while the remaining $15,000 above the threshold is withheld at 37%. That means the withholding would be $1,100 on the first part and $5,550 on the excess, for a total estimated federal withholding of $6,650 before any extra withholding requests.

How the aggregate estimate works in this calculator

The aggregate estimate on this page is designed to be practical for employees who want a better approximation than simply multiplying the bonus by 22%. It uses your annual regular wages, filing status, and pay frequency to derive regular pay per period. Then it computes annualized federal tax on regular wages alone and annualized federal tax on regular wages plus the bonus allocated to the current pay period. The difference between those two per-period withholding amounts is treated as the bonus-related withholding estimate.

This method is especially useful when:

• Your bonus is paid on the same check as your normal salary or hourly wages.
• Your payroll department uses a combined withholding calculation.
• You want to see how your filing status changes the estimated withholding.
• You suspect the 22% flat rate may understate or overstate what payroll will actually withhold.

However, several payroll-specific details can change the final number, including your Form W-4 configuration, dependents, extra withholding elections, prior-period adjustments, pretax deductions, and whether your employer uses exact IRS percentage tables at the payroll frequency level. For that reason, aggregate estimates are very useful planning tools, but they should not be treated as a substitute for your pay stub or your employer’s payroll engine.

What counts as a bonus for withholding purposes

In payroll language, many payments that do not look like a “bonus” can still be handled as supplemental wages. Examples include sales commissions, sign-on incentives, retention bonuses, referral awards, profit-sharing distributions treated as wages, and retroactive salary increases. If these payments are taxable wages reported on Form W-2, the federal withholding rules discussed here may apply. The exact classification depends on the facts and the way the employer processes payroll.

Common mistakes when estimating bonus withholding

• Confusing withholding with actual tax. A bonus may have 22% withheld federally, but your final tax rate on that income could be lower or higher depending on your full-year return.
• Ignoring pretax deductions. If you contribute part of the bonus to a 401(k) or HSA through payroll, the taxable amount for federal withholding may be reduced.
• Forgetting FICA taxes. Federal income tax withholding is only one piece of what reduces the net payment.
• Assuming all bonuses are taxed the same way. The withholding method can vary by employer payroll setup.
• Missing the $1 million threshold rule. High earners may see a significant jump in withholding once supplemental wages exceed that level.

How to use this calculator effectively

Start by entering the gross bonus amount and any year-to-date supplemental wages already paid earlier in the year. Add any pretax deductions that will be taken from this bonus. If you know your employer uses the flat supplemental rate, choose the percentage method. If the bonus will be paid with your regular paycheck or you want a more nuanced estimate, choose the aggregate method and provide annual regular wages, filing status, and pay frequency. If you have asked payroll to withhold an additional fixed dollar amount, enter that in the extra withholding field.

After you calculate, compare the estimated federal withholding with your upcoming pay stub. If the amount differs, the most likely reasons are additional payroll adjustments, W-4 settings, state taxes, or FICA treatment. The chart on this page helps visualize the split between gross bonus, federal withholding, and estimated net amount so you can budget more confidently.

Authoritative federal sources

For official details, review current IRS publications and withholding guidance. Helpful sources include the IRS Publication 15, Employer’s Tax Guide, the IRS Tax Withholding Estimator, and payroll tax references hosted by educational institutions such as the Cornell Law School Legal Information Institute for the Internal Revenue Code. If your bonus is large or your payroll circumstances are complex, consider checking with a CPA, EA, or your employer’s payroll department.

Bottom line

To calculate federal withholding on bonus pay, you first need to know whether your employer is using the percentage method or the aggregate method. For most common bonus checks paid separately, 22% of the taxable amount is the baseline estimate, subject to a 37% rate on supplemental wages above $1 million in a calendar year. For bonuses paid with regular wages, the aggregate method can produce different results based on annualized income and filing status. Use the calculator above as a planning tool, then confirm the final amount with your pay statement and current IRS guidance.

This calculator provides an educational estimate of federal income tax withholding on a bonus. It does not include Social Security, Medicare, state taxes, local taxes, or every Form W-4 adjustment. For official payroll treatment, consult your employer and the IRS.