Double-tax agreements: how treaties interact with Thailand's remittance tax

Thailand has built a wide network of bilateral double tax agreements since its first with Sweden in 1963; the Revenue Department publishes each treaty text on its site. They cover income taxes only — personal income tax, corporate income tax and petroleum income tax — never VAT or specific business tax. Each treaty allocates taxing rights between Thailand and the partner state and eliminates double taxation by one of two methods: exemption (the residence country stands back from income taxed at source) or, for individuals remitting foreign income, credit (the residence country taxes the income but deducts the foreign tax already paid).

The credit method is exactly how treaties mesh with the post-2024 remittance rules. The Revenue Department's official Q&A on Por 161/162 confirms there is no double taxation: a Thai tax resident who remits foreign income that was already taxed abroad may credit that foreign tax against the Thai tax due in the year of remittance, under the treaty with the country concerned. Thailand's treaties use the ordinary-credit mechanism, which in each treaty's elimination-of-double-taxation article generally limits the credit to the Thai tax attributable to that income — check the article in your own treaty.

The folklore correction: a DTA does not make foreign income invisible to Thailand. 'It was already taxed at home' usually means a credit, not an exemption — you generally still declare the remitted income. Whether a pension escapes Thai tax entirely depends on the specific article of your country's treaty (treaty pension articles differ: many follow the OECD pattern — government-service pensions taxable only by the paying state, private pensions in the residence state — but some, notably the 1981 UK/Thailand Convention, contain no private-pension article at all), so read your own treaty rather than extrapolating from another nationality's forum post.