Bonus Calculator
Estimate the tax on a bonus payment and your net amount after tax.
Net bonus after tax
฿85,000
Taxed at your marginal rate of 15.0%
- Tax on bonus
- ฿15,000
- Net bonus
- ฿85,000
How this is calculated
This calculates your tax with and without the bonus added to your net taxable income, using Thailand’s progressive tax brackets, and takes the difference as the tax attributable to the bonus specifically — the marginal-tax method used to price the real cost of a one-off payment.
Related guides & tools
- 2026 Thai income tax brackets and rate table — why a bonus can push part of your income into a higher band
- How Thai income tax works for foreigners — how Thai income tax applies to foreign employees
Frequently asked questions
Why is the tax rate on my bonus higher than my usual marginal rate?
A bonus is taxed at the marginal rate that applies once it's stacked on top of your existing annual income — since Thailand uses progressive tax brackets, adding a lump sum on top of your regular income often pushes some or all of it into a higher bracket than your average rate.
Where do I find my net taxable income before the bonus?
Use the Thai Personal Income Tax Calculator with your regular annual income (excluding the bonus) — its result includes a net taxable income figure you can enter here.