Corporate Tax Calculator
The Corporate Tax Calculator estimates an income, tax or statutory-cost estimate for the figures entered from the income, employment or business status, relevant period, allowances and current thresholds shown on the page. Replace the example values with your own corporate tax figures and recalculate after changing an assumption. Treat it as a planning estimate and independently verify the current rule or provider terms.
[updated year 2026]
Calculate corporate tax on net profits for companies and SMEs
Corporate tax.
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The actual tax rate.
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Net profit after tax
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❓ Frequently Asked Questions
What is the corporate tax rate in Thailand?
General company pay corporate tax 20% of net profit SME capital not exceeding 5 million baht revenue not exceeding 30 million baht pay tax step 15-20%
How do SMEs qualify for special tax rates?
SME Profit not exceeding 300,000 baht Taxable 0% Profit 300,001-3,000,000 baht Taxable 15% Profit exceeding 3,000,000 baht Taxable 20%
How is net profit calculated?
Net profit = revenue - taxable expenses. Some expenses are deductible as 1.5 or 2, such as R&D training fees.
When do you file your corporate tax?
File Form 50 within 150 days after the end of the accounting period (normally 31 May for the accounting year ending 31 December) and Form 51 half-year within 31 August
English calculator guide
How to use the Corporate Tax Calculator
Use this page to test a specific corporate tax scenario. Enter your own values in the calculator above, review the units beside each field, and recalculate after changing an assumption. The result updates the corporate tax estimate instead of relying on a generic example.
- Build a baseline corporate tax case with figures that match your situation.
- Run a second corporate tax case after changing the rate, period, quantity or other key assumption.
- Record the difference between the two corporate tax results and the input responsible for it.
Inputs for the corporate tax estimate
For this corporate tax calculation, check the income, employment or business status, relevant period, allowances and current thresholds shown on the page. The result is designed to show an income, tax or statutory-cost estimate for the figures entered, not a guaranteed provider price or official decision.
How the corporate tax result is calculated
The calculator applies the displayed statutory rates, thresholds and allowances to the figures you enter. Reusing the same corporate tax inputs will produce the same estimate, which makes the page suitable for controlled scenario comparisons.
Checks for a corporate tax decision
Check the effective date and confirm current rules with the relevant Thai authority or a qualified adviser. For corporate tax, Use the result as a commercial planning estimate. Confirm supplier prices, payment-provider fees, taxes, minimum charges and contract terms before setting a price or budget. Because this calculation can affect an important financial, legal or health decision, independently verify the inputs and current rules before relying on the result.
- Language QA
- Terminology, numeric values and calculator controls checked
- Calculator scope
- Tax and statutory rate
- Last English review
- 26 July 2026