Expat Tax Residency in Thailand

Thailand operates a straightforward residency test under Section 41 of the Revenue Code: 180 days of physical presence in a calendar year makes you a tax resident. From 2024, a landmark rule change extended Thai taxation to foreign-source income remitted into the country, closing a long-standing deferral route. Understanding both the residency threshold and the remittance rules is the starting point for any expat managing income across borders.

When are you a tax resident of Thailand?

A person is a Thai tax resident when they are present in Thailand for an aggregate period exceeding 180 days in any calendar year (1 January through 31 December), as established by Section 41 of the Revenue Code and confirmed by the Thai Revenue Department official English guidance [1]. Days of presence need not be consecutive; the test accumulates all days within the same tax year regardless of purpose, visa category, or immigration status. Each calendar year is evaluated independently. Non-residents are subject to Thai personal income tax (PIT) only on income sourced within Thailand. Residents face PIT on Thai-source income and, from 1 January 2024 onwards, on foreign-source income remitted into Thailand under the revised framework established by Departmental Instructions Por. 161/2566 and Por. 162/2566 [1][2].

How did Thailand's foreign-income rule change in 2024?

Prior to 2024, a long-standing interpretation of Section 41 Paragraph 2 of the Revenue Code meant that foreign-source income earned in one calendar year and remitted to Thailand in a later year was not assessable. Thai tax residents could defer remittance indefinitely to defer Thai PIT on offshore earnings. Departmental Instruction Por. 161/2566, effective from 1 January 2024, eliminated that deferral. Under the revised interpretation confirmed by KPMG Thailand and multiple Thai tax practices, any foreign-source income earned on or after 1 January 2024 and remitted to Thailand in the same or any subsequent year is assessable income in the year of remittance [3]. The companion order Por. 162/2566 provides transitional protection: foreign-source income earned before 1 January 2024 remains subject to the prior same-year-remittance rule and is not assessable if remitted after 2023, provided the taxpayer can document the pre-2024 earning date through bank records or equivalent evidence [3].

How is foreign income remitted to Thailand taxed?

Foreign-source income that is assessable under the revised remittance framework is included in the taxpayer's total net assessable income for the year of remittance and taxed at the same progressive PIT rates that apply to Thai-source income. The taxpayer declares the remitted amount on the annual PIT return (Form PND 90 for multi-source income or PND 91 for employment income) filed by 31 March following the tax year. Thailand's network of over 60 double taxation agreements, including treaties with the United States, United Kingdom, Japan, Germany, Singapore, and Australia, may reduce or eliminate Thai tax where the source country has primary taxation rights or where a foreign tax credit can be claimed. Long-Term Resident (LTR) visa holders in the Wealthy Global Citizen, Wealthy Pensioner, and Work-from-Thailand Professional categories hold a statutory exemption under Royal Decree No. 743 and are not subject to Thai PIT on foreign-source income remitted to Thailand even if they meet the 180-day residency test [2]. For country-level context see Thailand country overview and consider consulting a qualified cross-border tax professional before filing.

What are the personal income tax rates in Thailand?

Thai PIT follows eight progressive bands under Section 48 of the Revenue Code, applied to net assessable income after deductions and allowances. Employment income qualifies for a standard deduction of 50 percent of gross income, capped at THB 100,000. The personal allowance is THB 60,000 per filer. The progressive bands as published by the Thai Revenue Department and cross-checked against PwC Worldwide Tax Summaries are [1][4]:

The chart below illustrates how the effective marginal rate steps across the eight brackets.

The top marginal rate of 35 percent applies to net assessable income above THB 5,000,000. A qualified tax professional can advise on which deductions and allowances apply to a given filing situation.