Reviewed by ThaiLawOnline, a licensed Thai law firm practising in Thailand since 2006. Thai lawyer of record: Wichuda Atthamethakon, LL.M., Thai Bar Licence 3149/2556.
Last updated on September 5, 2026
A tax resident of Thailand (ผู้มีถิ่นที่อยู่ในประเทศไทยเพื่อการเสียภาษี, in practice tax residency or Thai tax resident) is any individual who is present in Thailand for 180 days or more in a calendar year, under Section 41 of the Revenue Code. The test is arithmetic: no visa type, work permit, home or intention is needed, and a retiree on a Non-O extension is caught just as an employee is. Residency matters because a resident is taxable on foreign-sourced income brought into Thailand, and since 1 January 2024 that includes income earned in earlier years.
Table of Contents
How the 180-day rule works
Counting days. The year is the calendar year, 1 January to 31 December, and the 180 days need not be consecutive: someone who spends 100 days in Thailand in the spring and 80 in the autumn is resident for the whole year. The passport stamps are the evidence, and residency is decided year by year.
What residency changes. Everyone, resident or not, pays Thai tax on income from a Thai source, such as a Thai salary or Thai rental income. A resident is in addition taxable on income from a foreign source that is remitted into Thailand. Under Departmental Instruction Por. 161/2566, in force since 1 January 2024, that income is assessable in the year it is brought in whatever year it was earned; under Por. 162/2566, income earned before 1 January 2024 stays outside the net whenever it is remitted. The condition is residency in the year the income arose.
What a resident foreigner has to do
A resident with assessable income above the filing threshold (60,000 baht for a single person, or 120,000 baht where the only income is employment income) must obtain a tax identification number and file a personal income tax return for the calendar year between 1 January and 31 March of the following year. Rates are progressive, from an exempt first band up to a top marginal rate of 35%. Foreign tax paid on the same income can usually be credited under a double tax agreement, but the credit must be claimed with evidence.
The common mistake is to assume that money spent from a foreign card or withdrawn at an ATM is not remitted. Money brought in by any route is remitted; the question is only whether it is post-2023 income or pre-2024 savings, which is why records of each transfer matter. The exemption discussed since 2025, for income remitted in the year earned or the year after, had not been published in the Royal Gazette as at 4 September 2026 and has no legal effect.
Tax residency is not immigration residency
The term is confused with three others. Permanent residency is an immigration status granted by the Ministry of Interior and has nothing to do with the 180 days. A tabien baan or a pink ID card proves address, not tax status. And holding a long-term visa does not by itself make anyone a tax resident: the LTR visa holder who spends 200 days in Thailand is resident under Section 41, although some LTR categories carry an exemption for remitted foreign income by Royal Decree.
A person can be resident in two countries at once. Domestic Thai law has no tie-breaker; the treaty with the other country does, and the Revenue Department issues a certificate of residence (form R.O. 22) to residents who must prove their status abroad.
Frequently asked questions
How many days makes you a tax resident in Thailand?
180 days or more in a calendar year, counted cumulatively from the passport stamps. Visa type is irrelevant: a retiree, a digital nomad on a DTV and a Thai employee are all tested the same way. The count restarts every 1 January.
Does a tax resident of Thailand pay tax on foreign income?
Yes, on foreign-sourced income remitted into Thailand, if the person was resident in the year the income arose. Since 1 January 2024 it no longer matters that the money was earned in an earlier year, but income earned before 2024 remains exempt, and tax paid abroad can generally be credited under a double tax agreement.
Do I need to file a Thai tax return if I stay less than 180 days?
Only for Thai-sourced income, such as a salary or rent earned in Thailand, above the filing threshold. A non-resident is not taxed on foreign income brought into the country. Staying under 180 days in a given year is therefore the simplest way to keep foreign remittances outside Thai tax for that year.
See also: Foreign-sourced income, Double tax agreement, Tax identification number, foreign income remittance tax in 2026 and personal income tax in Thailand.
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