The Stamp Duty Calculator estimates a general arithmetic estimate for your scenario from the quantities, rates, period, units and other assumptions requested on the page. Replace the example values with your own stamp duty figures and recalculate after changing an assumption. Use it to compare scenarios, then verify any current rate or fee before acting.
Calculate stamp duty according to document type, lease agreement, loan agreement, share certificate and other instruments. According to the Revenue Code
Select instrument type
Calculation results
Document type-
Contract value-
Stamp duty payable-
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What is Stamp Duty?
Stamp duty is a tax levied by the government on certain legal acts that must be in writing. According to the list of stamp duty rates at the end of Section 6 of the Revenue Code.
Important stamp duty rates
Instrument type
rate
Land/real estate lease agreement
1 baht / 1,000 baht
loan contract
1 baht / 2,000 baht
Share certificate / debenture certificate
1 baht / 1,000 baht
contract for work
1 baht / 1,000 baht
Share transfer form
1 baht / 1,000 baht
Formula used for calculation
Stamp duty = contract value × duty rate
Rate 0.5%−1% Depends on the type of contract, such as a pawn contract, sales contract, share certificate, contract for making goods.
Calculation example
Example 1: Property pawn contract, value 500,000 baht
Contract value = 500,000 baht
Duty rate = 1% (pawn contract)
revenue stamp = 500,000 × 1% = 5,000 baht
Example 2: Contract for work, value 200,000 baht
Contract value = 200,000 baht
Duty rate = 1 baht / 1,000 baht = 0.1%
revenue stamp = 200,000 × 0.1% = 200 baht
summarize
Making various contracts, such as pawning or buying and selling, requires affixing stamps and paying duties. According to the law on stamp duty Failure to pay duties may render the contract legally invalid.
Stamp duty is a duty according to the Revenue Code, Section 6, collected from the making of certain types of documents or instruments, such as lease agreements, loan contracts, share certificates. The stamp must be affixed or the duty must be paid within 15 days after making the document.
How is stamp duty calculated on a rental contract?
Lease contract stamp duty = Rent for the entire contract period ÷ 1,000 (rounded up) × 1 baht Example: Rent 10,000 baht/month contract 1 year = 120,000 baht ÷ 1,000 = 120 baht
Instruments not affixed with stamp duty cannot be used as evidence in a civil case. until duties and penalties are paid There is also a fine not exceeding 500 baht or 5 times the unpaid duty.
Check before using results
Summary before deciding
This calculation result is suitable for preliminary planning. Actual figures should be checked from documents or official sources before making important decisions.
The calculation is based on the information you enter on this page.
Special cases may require additional information.
It is recommended to record or compare the results with the related tools below.
Disclaimer: Calculation results are only estimates. It does not constitute tax or legal advice. Please consult a tax professional for your specific circumstances.
English calculator guide
How to use the Stamp Duty Calculator
Use this page to test a specific stamp duty 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 stamp duty estimate instead of relying on a generic example.
Build a baseline stamp duty case with figures that match your situation.
Run a second stamp duty case after changing the rate, period, quantity or other key assumption.
Record the difference between the two stamp duty results and the input responsible for it.
Inputs for the stamp duty estimate
For this stamp duty calculation, check the quantities, rates, period, units and other assumptions requested on the page. The result is designed to show a general arithmetic estimate for your scenario, not a guaranteed provider price or official decision.
How the stamp duty result is calculated
The calculator applies the displayed inputs to the stated arithmetic relationship. Reusing the same stamp duty inputs will produce the same estimate, which makes the page suitable for controlled scenario comparisons.
Checks for a stamp duty decision
Confirm any current rate, threshold or provider rule that could change the final amount. For stamp duty, Treat the result as an estimate for planning. Tax rules, eligibility and deduction limits can depend on the tax year and your evidence, so compare the result with current Revenue Department guidance or a qualified adviser. Recheck the entered values and units if the result looks unexpected.
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Review formula structure, test cases, data sources, effective dates, and risk language accordingly.How to check our · There is no claim that an outside professional reviewed it. Unless the page directly states the name and qualifications. This content is therefore not individual advice.
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