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Thailand Tax
Thailand has tax treaties with 61 countries. Here's what they actually do, and the paperwork that turns a treaty from a theoretical right into real money saved.
A double taxation agreement, or DTA, is a treaty between two countries that settles which one gets to tax a given piece of income, and provides a mechanism so the same money isn't taxed twice. Thailand currently has DTAs in force with 61 countries, including the UK, the US, Australia, Canada and Singapore.
Thailand grants a foreign tax credit equal to the lesser of two figures: the tax you actually paid on that income abroad, or the tax Thailand would have charged on the same income under its own rules. The credit reduces your Thai tax bill by that amount — it doesn't refund tax paid overseas, and it doesn't automatically mean zero tax is due in Thailand.
Each DTA is its own document, and different income types — pensions, dividends, rental income, employment income — are often treated differently within the same treaty. There is no single universal answer; the specific treaty with your specific country governs.
Issued by your home country's own tax authority (HMRC in the UK, the IRS in the US), confirming you're tax resident there for the relevant year.
On your Thai return, report the foreign income you remitted and the tax you've already paid on it at source.
Filed alongside form PND.90, these formally claim the treaty relief rather than leaving it to be assumed.
US citizens specifically: a "savings clause" in the US–Thailand treaty means Americans generally can't rely on the Thai DTA the way most other nationalities can. US citizens typically need to use US-side mechanisms — the Foreign Tax Credit or the Foreign Earned Income Exclusion — to avoid double taxation instead. This is worth raising specifically with a tax adviser familiar with US expat rules.
Worth doing
Request your Certificate of Residence from your home tax authority well before you need it — some issue it within days, others take weeks. Don't leave this until you're filling in a Thai tax return under deadline pressure.
This page explains general principles as understood in mid-2026 and is not personalised tax advice. The terms of your specific treaty govern your situation — always confirm with a qualified Thai tax professional before relying on treaty relief.