Bonus Tax Calculator

You just saw a $10,000 year-end bonus hit your payroll, but the deposit in your bank account is only $6,700. The missing $3,300 went to federal withholding, FICA taxes, and possibly state taxes. Understanding exactly how much will be deducted from a bonus before you receive it lets you plan major purchases or debt payments with confidence – and a bonus tax calculator does precisely that.

How Bonuses Are Taxed

Bonuses fall into a special category the IRS calls supplemental wages. Employers can choose between two withholding methods: the percentage method and the aggregate method. Neither alters your final tax bill, but each affects how much is taken out right away.

• Percentage method – A flat 22% federal withholding rate applies to bonuses up to $1 million. Any amount above $1 million is withheld at 37%. This method is straightforward and does not consider your regular salary.
• Aggregate method – The bonus is added to your most recent regular paycheck, and withholding is calculated on the combined amount using the standard IRS tables. This often pushes a portion of your income into a higher withholding bracket for that single pay period.

Many payroll systems default to the percentage method for standalone bonuses, but employers may switch methods from one bonus to the next.

The calculator above lets you enter your bonus amount, select a withholding method, and, if you choose the aggregate method, input your typical gross pay. After you provide your state and any pretax deductions, it instantly computes federal, FICA, state, and net bonus amounts.

Federal Tax Withholding on Bonuses

Federal withholding uses the flat 22% rate for supplemental wages below $1 million. Once your cumulative supplemental wages for the year cross the $1 million mark, the rate jumps to 37% on the excess. If you receive a $1.3 million bonus, for example, the first $1 million is subject to 22%, while the remaining $300,000 is subject to 37%.

The aggregate method, on the other hand, relies on your Form W-4 details and the IRS wage-bracket tables. Because the combined sum artificially inflates your income for that pay period, you may see a higher effective withholding rate – often between 24% and 35% – even if your annual bracket is lower.

FICA Taxes: Social Security and Medicare

Bonuses are not exempt from payroll taxes. Two additional deductions come out before you receive your net pay:

• Social Security – 6.2% on gross wages up to the annual wage base limit ($176,100 for 2026). If your year-to-date earnings already exceed the limit, no further Social Security is withheld.
• Medicare – 1.45% on all wages, with no upper limit. High earners pay an additional 0.9% Medicare surtax on wages above $200,000 (single) or $250,000 (married filing jointly).

For a $20,000 bonus early in the year, expect $1,240 in Social Security tax and $290 in Medicare tax, plus possibly the extra Medicare surtax if your total compensation already exceeds the threshold.

State Taxes on Bonuses

State withholding rules vary widely. Some states, such as Texas, Florida, and Washington, have no income tax, so only federal and FICA taxes apply. Others use a flat rate – Massachusetts at 5% or Indiana at 3.15% – while states with progressive brackets, like California and New York, may push your bonus into a higher marginal rate.

The calculator accounts for state-specific supplemental withholding rules where applicable. Selecting the correct state ensures your net estimate is as accurate as possible.

How to Calculate Your Net Bonus

Follow these steps to manually estimate your take-home bonus, or simply use the calculator above for instant results:

1. Determine the federal withholding based on the method your employer uses. If it is the percentage method, multiply the bonus by 0.22 (or 0.37 for amounts over $1 million).
2. Subtract Social Security at 6.2% on the full bonus, as long as your annual total is under the wage base limit; otherwise, apply 0%.
3. Subtract Medicare at 1.45% on the entire bonus, plus the additional 0.9% surtax if applicable.
4. Subtract state income tax using the flat rate or the appropriate bracket for your total period income.
5. The remaining amount is your net bonus.

For example, a California resident with a $15,000 bonus under the flat 22% method would lose $3,300 federal, $930 Social Security, $217.50 Medicare, and approximately $1,155 state withholding – leaving about **$9,397.50**.

Why Withholding on Bonuses Looks So High

A 22% or 37% federal withholding rate often exceeds most workers’ effective tax rate. That is because the U.S. tax system is progressive: your average liability is usually lower than your top marginal bracket. The flat withholding method simply uses a predetermined rate without accounting for your personal deductions, credits, or filing status.

Over-withholding from bonuses is common. When you file your annual return, the IRS reconciles the total tax paid with your actual liability. If too much was held back, you receive a refund – the government does not keep the extra money. You can also adjust your regular paycheck withholdings after a bonus-heavy month to smooth cash flow.

This calculator provides estimates and is for informational purposes only. Federal and state tax rules change frequently; always confirm the latest withholding rates and consult a qualified tax professional for advice specific to your situation.