Thailand Tax Residency for Foreigners

You are a Thai tax resident in any calendar year in which you spend 180 days or more inside Thailand. Days are counted by physical presence — any part of a day counts, including arrival and departure days. The threshold applies per year independently: you can be a resident one year and not the next based on how long you stayed. The 180-day rule is purely about days, not about visa type or work permit status — a tourist on multiple TR visas, a retiree on a Non-O, and an LTR-visa holder are all treated identically for residency purposes.

Thai-source income (salary from a Thai employer, profits from a Thai business, rental income from Thai property) is always taxable in Thailand, regardless of residency. For tax residents, foreign-source income — overseas salary, freelance fees, dividends, capital gains, pension — becomes taxable when it is remitted (transferred) into Thailand in the same calendar year it was earned. The pre-2024 interpretation allowed you to remit foreign income in a subsequent year tax-free; that loophole is closed. Income earned BEFORE 1 January 2024 and held abroad remains exempt when remitted under transitional rules. Income earned and kept abroad without remittance is not taxed in Thailand at all.

Thailand has tax treaties with around 60 countries including the US, UK, Australia, Canada, Germany, France, Japan, and most of the EU. Treaties typically prevent double taxation by either exempting income in one country or allowing credit for tax paid elsewhere. The treaty does not automatically eliminate Thai tax — you must claim relief, usually by providing a residency certificate and proof of foreign tax paid. American citizens face additional complexity because the US taxes citizens on worldwide income regardless of residency; Thai tax paid is usually creditable against US tax via Form 1116 but the interaction is non-trivial.

Thai personal income tax is progressive: 0% on the first 150,000 THB, then 5% / 10% / 15% / 20% / 25% / 30% / 35% on subsequent brackets. The top 35% rate kicks in above 5,000,000 THB. Annual returns (PND 90 or PND 91) are filed between January and March for the previous calendar year, online via the e-Filing portal or in person at the Revenue Department. Residents must obtain a Tax ID (TIN) before filing — application is at any Revenue Department area office with a passport and proof of address.

Most retirees living on pension remitted from abroad now technically have a Thai filing obligation if they spend 180+ days in country. Most digital nomads using foreign-source freelance income remitted in the same year do too. Many people in this position have not yet been pursued by the Revenue Department — enforcement against individual foreign retirees has historically been minimal — but the legal position changed in 2024, and the prudent course is to consult a Thai tax adviser, obtain a TIN, and file. The LTR visa carries an explicit foreign-income tax exemption that bypasses this issue entirely for qualifying holders.

Crypto disposals are taxed as capital gains at the regular progressive rates if the disposal occurs while you are a Thai tax resident. Crypto remitted into Thai bank accounts as fiat is treated as foreign-source income. There is no separate flat-rate crypto tax; capital gains are pooled with other income. Sale of foreign shares follows the same rule. Sale of Thai-listed shares through a SET broker is exempt from capital gains tax at the individual level — a structural benefit of investing through Thai brokerages.