Thailand has double tax agreements (DTAs) in force with more than 60 countries, including the US, UK, most of the EU, Australia, Japan, China, Singapore, and India. These treaties generally follow the OECD Model Convention, providing tie-breaker rules for dual tax residency, reduced withholding tax rates on cross-border dividends/interest/royalties, and mechanisms (exemption or foreign tax credit) to relieve double taxation. Since the 2024 change to how Thailand taxes remitted foreign income, DTAs have become more actively relevant for expats and LTR-adjacent residents seeking to claim treaty-based relief or confirm which country has primary taxing rights on specific income streams.
For residents with income taxed both at source abroad and in Thailand on remittance, the applicable DTA can determine whether a foreign tax credit or exemption is available, directly affecting the total tax bill.
Key Facts
Thailand has DTAs in force with 60+ jurisdictions, including the US, UK, Germany, France, Australia, Japan, China, Singapore, and India.
Most Thai DTAs follow the OECD Model, with reduced withholding rates typically in the 10-15% range for dividends, interest, and royalties (varies by treaty).
Relief from double taxation is generally via the credit method (Thailand or the treaty partner grants a credit for tax paid in the other country) rather than blanket exemption.
A Certificate of Residence issued by the Thai Revenue Department is typically required to claim treaty benefits abroad.
Treaty tie-breaker tests (permanent home, center of vital interests, habitual abode, nationality) resolve cases where an individual is tax resident in both Thailand and a treaty partner under domestic law.
Steps
Identify the relevant treaty — Check whether Thailand has a DTA in force with the country where the other-source income arises or where dual residency may apply.
Obtain a Certificate of Residence — Apply to the Revenue Department for a Certificate of Residence to substantiate Thai tax residency when claiming treaty relief with a foreign tax authority.
Claim foreign tax credit or exemption — File the annual PIT/CIT return claiming the treaty-based credit for foreign tax already paid on the same income, supported by foreign tax payment evidence.
Required Documents
Certificate of Residence from the Thai Revenue Department
Foreign tax payment certificates/receipts
Relevant DTA text and applicable article reference
Common Mistakes
Assuming a DTA automatically eliminates tax in one country — most Thai DTAs use the credit method, so tax is still owed but offset, not simply waived.
Not applying early enough for a Certificate of Residence, which some foreign tax authorities require before granting withholding tax relief at source.
Overlooking that not every country has a DTA with Thailand — always confirm one is actually in force before relying on treaty relief.