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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 2026. Compare flat-rate vs. aggregate method and see how Uncle Kam clients reduce that number with smarter strategy.
Start the Calculator

How it works

1. Enter Your Bonus Amount

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

2. Select Flat-Rate or Aggregate Method

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

3. Review Your After-Tax Bonus

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

Need Professional Tax Help?

Review your results with a tax professional to confirm whether an S-Corp is the right move for your business. If the numbers show potential savings, the next step is validating them with an expert. A personalized review can help confirm whether these estimates apply to your specific situation.
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Why Use This Calculator?

Decide when to receive a bonus based on your tax bracket
Compare flat-rate (22%) vs. aggregate (regular pay rate) taxation
Plan how to invest, contribute, or defer your bonus strategically
Avoid overpaying or under-withholding at year-end
Estimate how much tax will be withheld from your 2026 bonus

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