Thailand Income Tax Calculator
Estimate income tax in Thailand across a tax-free allowance and two rate bands, with effective and marginal rates.
About Thailand Income Tax Calculator
Progressive systems tax each slice of income at its own rate rather than applying one rate to the whole amount. That is why the effective rate is always below the marginal rate — only the last slice is taxed at the top rate you reach. Indicative bands for Thailand. Confusing the marginal rate with the effective rate leads people to believe a pay rise leaves them worse off, which progressive banding never does.
Formula
Thailand Income Tax
Tax = (band 1 income × basic rate) + (income above the threshold × higher rate)
- allowance
- Income taxed at zero per cent
- threshold
- Income level where the higher rate begins
Worked example
With the default values below, Thailand Income Tax Calculator returns Total Income Tax of THB 73,710.00. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Annual taxable incomeminimum 0 THB
- 630,000 THB
- Tax-free allowanceminimum 0 THB
- 138,600 THB
- Basic rateaccepts 0–100 %
- 15 %
- Income where the higher rate startsminimum 0 THB
- 724,500 THB
- Higher rateaccepts 0–100 %
- 30 %
Results
- Total Income Tax
- THB 73,710.00
- Income After Tax
- THB 556,290.00
- Effective Tax Rate
- 11.70%
- Marginal Rate on the Next Unit Earned
- 15.0%
- Monthly Income After Tax
- THB 46,357.50
Step by step
- 1Values used
- 2Thailand Income Tax
- 3Total Income Tax= 73,710.00
- 4Income After Tax= 556,290.00
- 5Effective Tax Rate= 11.70
- 6Marginal Rate on the Next Unit Earned= 15.0
- 7Monthly Income After Tax= 46,357.50
Assumptions and limits
- The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation or fees or charges into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Thailand Income Tax calculated?
Tax = (band 1 income × basic rate) + (income above the threshold × higher rate) Progressive systems tax each slice of income at its own rate rather than applying one rate to the whole amount. That is why the effective rate is always below the marginal rate — only the last slice is taxed at the top rate you reach.
Why does Thailand Income Tax matter?
Indicative bands for Thailand. Confusing the marginal rate with the effective rate leads people to believe a pay rise leaves them worse off, which progressive banding never does.
What values do I need to enter?
This calculator takes 5 inputs: Annual taxable income, Tax-free allowance, Basic rate, Income where the higher rate starts, Higher rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.
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Thailand specifics
- Currency
- ฿ THBThai Baht
- Region
- Asia
- Country code
- TH
- Amounts look like
- THB 1,234,567.89
- Dates look like
- Mar 9, 2026
- Units
- metricWeek starts Sunday
Results on this page are expressed in THB (Thai Baht). Figures are estimates for general planning — confirm current rates and thresholds with the relevant Thailand authority before relying on them.