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Bonus Tax Calculator: See How Much of Your Bonus You Will Actually Keep

Use our Bonus Tax Calculator to estimate how much tax will be withheld from your year-end, performance, or signing bonus in 2025. Compare flat-rate vs. aggregate method and see how Uncle Kam clients reduce that number with smarter strategy.

Start the Calculator

How it works

Illustration of a person entering a 'Bonus Amount' of $10,000 into a calculator.

Enter Your Bonus Amount

Provide your expected bonus amount—whether it’s already received or anticipated this year.

Select Flat-Rate or Aggregate Method

Choose how your employer withholds taxes (or let us estimate it for you).

Illustration of a person at a laptop choosing between two bonus tax calculation methods: 'Flat-Rate' and 'Aggregate Method'.
Illustration of a person looking at a laptop that shows their 'After-Tax Bonus' is $7,800.

Review Your After-Tax Bonus

See how much you’ll keep and how your bonus will be taxed—before it lands in your account.

Frequently Asked Questions

It’s currently 22% federally for bonuses under $1 million. This calculator uses the latest IRS guidance for your estimate.

It’s when your employer adds your bonus to your regular paycheck and withholds taxes based on your combined total income. This often results in higher withholding than flat-rate.

Yes—with proper planning. Contributions to a Solo 401(k), DB plan, or timing strategies can all reduce your taxable income.

Book a call with our team and we’ll help you plan how to time or structure your bonus for maximum after-tax value.

More frequently asked questions

Don’t Let Your Bonus Disappear to Taxes.

Let’s make your next bonus work harder. We’ll help you reduce the tax hit and reinvest it into long-term savings.

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