Thailand’s tax rules for foreign residents changed in a real way at the start of 2024, and the confusion hasn’t fully settled since. This guide covers the two things that actually matter for most expats and long-stay visitors: whether you count as a Thai tax resident, and what that means for money you bring in from abroad.
This is general information, not tax advice. Thai tax rules on foreign income are actively evolving, parts of what’s described below are settled law, and at least one significant change is still a proposal, not yet in force. Your situation, income type, home country, visa, how long you’ve been remitting money, changes the analysis. Talk to a Thai tax professional or a firm that specializes in expat tax before you file a return or make a decision about when to remit funds.
How does the 180-day tax residency rule work?
Spend 180 days or more in Thailand in a calendar year and you’re a Thai tax resident for that year. It’s a straightforward day count, based on physical presence, tracked against your immigration entry and exit stamps, not your visa type, intent, or where your “real” home is. The days don’t need to run consecutively, Thailand adds up every day you’re in the country across the year. Cross 180 and Thailand can tax you as a resident, both on Thailand-sourced income and, since 2024, on foreign-sourced income you remit into the country. Stay under 180 days and you’re a non-resident, generally only taxed on income sourced in Thailand.
What are Thailand’s income tax rates?
Thailand taxes net income on eight progressive brackets from 0% to 35%, and both residents and non-residents pay the same rate table on assessable income, resident status changes what counts as assessable (see below), not the rate table itself.
| Net taxable income (THB) | Tax rate |
|---|---|
| 0 - 150,000 | 0% (exempt) |
| 150,001 - 300,000 | 5% |
| 300,001 - 500,000 | 10% |
| 500,001 - 750,000 | 15% |
| 750,001 - 1,000,000 | 20% |
| 1,000,001 - 2,000,000 | 25% |
| 2,000,001 - 5,000,000 | 30% |
| Over 5,000,000 | 35% |
Rates apply to net taxable income after allowances and deductions, not gross income. Personal and other allowances reduce the taxable base before these brackets apply. ฿34 = US$1 (July 2026). Source: Thailand Revenue Department rate schedule, unchanged for 2026.
What changed with foreign income in 2024?
Foreign-sourced income a Thai tax resident remits into Thailand is now assessable no matter what year it was earned, closing a long-standing loophole. Before 2024, a well-known workaround let you earn income abroad one year and remit it to Thailand the following year, tax-free, since the old rule only taxed foreign income remitted in the same year it was earned. Revenue Department Order Por 161/2566, effective 1 January 2024, closed that gap by reinterpreting the relevant section of the Revenue Code. A follow-up order, Por 162/2566, clarified the transition: income or savings that existed before 1 January 2024 are not caught by the new rule when you remit them later, provided you can document that the money was there before the cutoff, typically a bank statement or account balance dated 31 December 2023, plus supporting evidence like foreign tax filings for that income.
In practice, this means a US-based investment gain or a UK pension payment earned in 2025 and brought into Thailand in 2025 or 2026 is assessable Thai income if you’re a tax resident that year. The same income, if it existed as savings sitting in an account before 1 January 2024, is generally not.
Is there an exemption for income remitted quickly?
There’s a proposal on the table, and it’s important not to confuse it with current law. The Thai Revenue Department has drafted a measure that would exempt foreign-sourced income from Thai tax if it’s remitted within the same calendar year it’s earned, or the year after, effectively restoring something close to the pre-2024 system. As of mid-2026, this remains a draft. It still needs Cabinet approval and review by the Council of State before it can take effect as a ministerial regulation, and its expected start date has already slipped past earlier projections floated in the Thai press. Treat it as not currently in effect. If you’re planning around the possibility that it passes, build in a fallback in case it doesn’t, and check the Revenue Department’s official announcements (or ask a tax professional) for its live status before you rely on it for anything.
Can a double tax agreement reduce what I owe?
Thailand has double tax agreements (DTAs) with 61 countries, including the US, UK, Australia, Canada, and most of Europe and Asia. If you’re a tax resident of one of these countries and you’ve already paid tax there on the same income, a DTA typically lets you claim a foreign tax credit against your Thai liability, reducing or, in some cases, eliminating double taxation on that income. The details depend entirely on the specific treaty text and the type of income, pensions, dividends, and business income are often treated differently, so a DTA doesn’t blanket-exempt you, it’s a credit mechanism you apply for. DTAs also don’t cover Thailand’s VAT or Specific Business Tax. If a meaningful amount of foreign income is involved, get a professional to walk through your specific treaty rather than assuming it works a particular way.
Does the LTR visa exempt foreign income from Thai tax?
If you hold an LTR (Long-Term Resident) visa under the Wealthy Global Citizen, Wealthy Pensioner, or Work-from-Thailand Professional categories, foreign-sourced income you remit to Thailand can be exempt from Thai personal income tax, one of the visa’s stated incentives, administered jointly by Thailand’s Board of Investment and the Revenue Department, subject to their specific conditions. It’s a real and meaningful benefit if you already qualify for the visa on its other criteria (income, assets, or professional requirements), but it doesn’t touch Thai-sourced income, salary from a Thai employer, Thai rental income, and similar are still taxed at the standard progressive rates regardless of your visa status. If you’re weighing visa options more broadly, our guides to the DTV visa and the retirement visa cover the non-tax side of eligibility and renewal.
When do you need to register for tax and file a return?
If you have assessable income for the year, whether Thai-sourced or remitted foreign income as a tax resident, you generally need a Tax Identification Number (TIN) from your local Revenue Office before you can file anything. Personal income tax returns are due by 31 March of the following year on paper, with roughly an extra week if you file online through the Revenue Department’s e-filing system. Getting a TIN takes some lead time and typically means an in-person visit with your passport and proof of address, so it’s not a same-day errand if the deadline is close. If you’ve just opened a Thai bank account or started receiving remittances regularly, it’s worth checking your filing obligation early rather than at the end of March.
What’s the practical enforcement reality?
Since 2024, Thai banks and immigration have shared more data with the Revenue Department than before, and the general direction of travel is toward tighter compliance, not looser. That said, enforcement on individual foreign remittances remains uneven in practice, plenty of long-term expats haven’t seen scrutiny of specific transfers, and plenty of others have been asked questions. Neither experience tells you what to expect. Treat the rules as real and applicable to you if you’re a tax resident remitting foreign income, not as something to gamble against based on anecdotes from other expats.
The honest take
This isn’t a guide you should use to decide what to do with your own money. The 180-day residency test is simple and well-established. What counts as assessable foreign income, and when, is genuinely in flux: Por 161/2566 and Por 162/2566 are real, current law, but the proposed same-year/following-year exemption is not law yet, no matter how confidently some threads and forum posts present it as settled. Getting this wrong, either overpaying out of excess caution or underpaying because you assumed a proposal was already in force, has real cost. If you’re a tax resident remitting meaningful foreign income, get a consultation with a Thai tax professional who works with expats specifically. It’s a modest cost against the risk of a wrong assumption.
Sources
- Thailand Revenue Department: Personal Income Tax (English site): official rate schedule and assessable income rules
- Thailand Revenue Department, Order Por 161/2566 and Order Por 162/2566 on the taxation of foreign-sourced income remitted by residents, effective 1 January 2024.
- Thailand Revenue Department: Double Tax Agreement (DTA) (English site): official list of DTA countries and treaty texts
- Reporting and legal analysis on the 2024 foreign-income remittance rule change and the 2025-2026 draft exemption proposal, including Forvis Mazars, HLB Thailand, Nishimura & Asahi, and Mahanakorn Partners.
- Thailand Board of Investment: LTR Visa (official program site): LTR visa program terms, including the foreign-sourced income tax exemption for Wealthy Global Citizen, Wealthy Pensioner, and Work-from-Thailand Professional categories.
- Thailand Revenue Department, Tax Identification Number registration and personal income tax filing deadlines (31 March paper filing, extended e-filing window), per the Revenue Department’s Personal Income Tax page above.