Thailand Tax Residency Rules
Thailand's tax residency threshold is 180 days — not the 183-day standard used by most countries. Spend 180 or more days in a calendar year and worldwide income becomes taxable in Thailand. A 2024 Revenue Department ruling also eliminated the prior-year exemption for foreign-sourced income remitted into Thailand, a change that affects many long-stay visitors and digital nomads.
| Residency threshold | 180 days in a calendar year |
| Counting window | Jan 1 – Dec 31 (calendar year — not rolling). Days need not be consecutive. |
| Rule type | Day-count — any purpose counts (tourism, business, transit) |
| Complexity | Medium — straightforward threshold, but 2024 remittance change adds complexity |
| Tax year | Jan 1 – Dec 31 |
| Special regimes | LTR (Long-Term Resident) visa — visa category with some tax benefits; 180-day test still applies for standard residents |
| Non-resident rate | 15% withholding on Thai-source income (employment, dividends); only Thai-source income is taxable |
| Schengen area | No |
| Treaty network | Moderate — bilateral tax treaties with 60+ countries |
| Official source | Revenue Department of Thailand (rd.go.th) ↗ |
The 180-day test
Under Section 41 of the Thai Revenue Code, an individual who is present in Thailand for 180 days or more in a calendar year is a Thai tax resident and is subject to tax on worldwide income. The calendar year runs January 1 to December 31 — the window resets each year.
Days do not need to be consecutive. A person who spends 90 days in Thailand from January through March, leaves, and returns for another 90 days in October has accumulated 180 days and is a tax resident for that calendar year. Arrival and departure days each count as a full day of presence.
Unlike Germany's habitual abode test or the UK's Statutory Residence Test, Thailand's threshold is purely quantitative. The purpose of your presence — whether tourism, remote work, business meetings, or transit — is irrelevant for the day-count.
180 days, not 183. Thailand's threshold is lower than the 183-day standard used by Spain, France, Germany, Mexico, Brazil, and most other countries. A person planning a long stay in Asia who uses Thailand as their primary base may cross the residency threshold earlier than expected — particularly if they modelled their stay on the more common 183-day rule.
The 2024 foreign income rule change
For many years, Thailand operated a territorial-adjacent rule for foreign income: income earned abroad and brought into Thailand in a different tax year from when it was earned was not subject to Thai tax. This made Thailand attractive for individuals who could time the remittance of their foreign income across year boundaries.
Revenue Department Order P.162/2566 eliminated this exemption effective January 1, 2024. Under the new rules, all foreign-sourced income remitted to Thailand by a Thai tax resident is taxable in Thailand, regardless of the year in which it was originally earned. Income earned in 2019 and remitted to Thailand in 2024 is now taxable in Thailand in the 2024 tax year.
The critical distinction that remains: income that is never remitted to Thailand is still outside the Thai tax base. Thailand taxes on a remittance basis — if the money never enters Thailand, it is not taxed. But once money is transferred to a Thai bank account or otherwise brought into Thailand, it is taxable income for that year, regardless of when it was earned.
The practical implication for long-stay visitors: if you spend 180+ days in Thailand and transfer funds from abroad to cover living expenses, those transfers may constitute taxable income under the new rules. The Revenue Department has issued guidance clarifying that transfers of savings accumulated before January 1, 2024 are still exempt, but post-2024 earnings remitted to Thailand are fully taxable.
Thailand's treatment of foreign income under its tax treaties may modify these rules. Under a treaty, employment income earned and taxed in another country may be exempt from or creditable against Thai tax. Whether a specific income type is treaty-protected depends on the treaty and the source country.
What to track
- Calendar year day count — the most important number. Track entry and exit dates carefully. The threshold is 180, not 183.
- Income remittances — any transfer of funds to Thailand from abroad may constitute taxable income under the post-2024 rules. Keep records of transfer dates, amounts, and the source of the funds (pre-2024 savings vs. post-2024 earnings).
- Visa status — tourist visas, non-immigrant visas, and LTR visas each have different entry and stay limits. Your visa type does not change the 180-day tax residency threshold, but it affects how long you can remain in Thailand without a visa run.
- Thai tax filings — if you become a resident in a given year, a PND 90 or PND 91 return is due by March 31 of the following year. Filing obligations persist even if no Thai tax is ultimately owed.
Track your Thailand days
Monitor your calendar-year accumulation against the 180-day threshold alongside other countries.
Frequently asked questions
What is the 180-day threshold in Thailand?
Under Section 41 of the Revenue Code, 180 days or more in a calendar year makes you a Thai tax resident subject to tax on worldwide income. Days need not be consecutive and any purpose of visit counts. Both arrival and departure days are counted in full.
Does Thailand count both arrival and departure days?
Yes. Both the day you arrive and the day you depart count as full days of Thai presence toward the 180-day threshold. Any partial day in Thailand is treated as a complete day.
What changed about foreign income in Thailand in 2024?
Revenue Department Order P.162/2566 (effective January 1, 2024) eliminated the year-offset exemption. Previously, foreign income earned in year A and remitted to Thailand in year B was exempt from Thai tax. As of 2024, any foreign-sourced income remitted to Thailand by a tax resident is taxable in the year of remittance, regardless of when it was earned. Income never brought into Thailand remains outside the Thai tax base.
Do I need to file a Thai tax return if I am a resident?
Yes. Thai tax residents must file a PND 90 (for income from multiple sources) or PND 91 (for employment income only) by March 31 of the following year. The filing obligation exists even if all income is foreign-sourced and no Thai tax is owed after applying treaty credits.
What is the LTR visa and does it affect tax residency?
The Long-Term Resident visa is a 10-year visa category for wealthy individuals, pensioners, and remote workers. It does not override the 180-day residency test. However, specific LTR sub-categories (Wealthy Global Citizen, Wealthy Pensioner) include an exemption for foreign-sourced income not remitted to Thailand. The Work-from-Thailand Professional category is reported to offer a flat 17% rate on Thai-source employment income. LTR benefits are category-specific and require separate verification.
Does Thailand tax non-residents on Thai-sourced income?
Yes. Non-residents — present fewer than 180 days in a calendar year — are taxed only on Thai-sourced income (not worldwide income). Thai-source income for non-residents is subject to withholding tax at 15% for most income types. Non-residents generally do not need to file a return if all Thai-source income has been withheld correctly at source.
Related guides and tools
Tracking Thailand alongside other countries?
Elcano monitors your Thai calendar-year day count alongside every other jurisdiction — free, no signup required. The 180-day threshold (not 183) is built in.
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This page is for informational purposes only and does not constitute tax or legal advice. Thai tax residency rules and the treatment of foreign-sourced income have been subject to significant regulatory change; verify current rules with the Revenue Department of Thailand (rd.go.th) and consult a qualified Thai tax advisor for your specific situation.