Thailand’s tax rules, effective from 2024, have had a far-reaching impact on foreign residents and long-term visa holders. From the definition of tax residency to the scope of personal income tax, and even the personal allowances and deductions available, every change to Thai tax law affects individuals and businesses living and working in the country. This article breaks down the latest 2026 Thailand tax rules, including the worldwide-income filing requirements for tax residents, the specific tax treatment for different visa holders, and how double tax agreements (DTAs) apply, to help you get on top of the essentials of Thai tax compliance. Details follow below.
Definition of Thai Tax Residency and Scope of Taxation
The Thai Revenue Department’s Order No. Por.161/2566, issued on September 15, 2023, provides that from January 1, 2024, Thai tax residents must pay personal income tax on foreign-sourced income from employment, business, or property, regardless of when it is remitted into Thailand. Previously, tax only applied to foreign-sourced income remitted into Thailand within the same tax year it was earned.
Order Por.162/2566, issued around the same time, confirms that foreign-sourced income earned before January 1, 2024 is not subject to the new rules, regardless of when it is remitted into Thailand.
Under the new order, anyone who has stayed in Thailand for a cumulative total of 180 days or more in a calendar year is treated as a Thai tax resident. These individuals must declare and pay tax on their worldwide income under Thai law.
The following case examples illustrate how this works:
Case 1: Ms. Wang’s Full-Year Stay
Ms. Wang entered Thailand on January 5, 2024 and left on December 28, without leaving the country in between. She spent 358 days in Thailand for the year — well beyond the 180-day threshold — so Ms. Wang is treated as a Thai tax resident for 2024 and must declare her worldwide income.
Case 2: Mr. Li’s Split Stay
Mr. Li first entered Thailand from March 1 to June 15, 2024, staying 106 days, then returned from September 1 to December 20, staying a further 111 days, for a total of 217 days for the year. Because his cumulative stay in 2024 reaches 180 days or more, Mr. Li is classified as a Thai tax resident and must pay tax on his worldwide income as required by law.
Case 3: Ms. Chen’s Short Visits
Ms. Chen made two short visits to Thailand in 2024: April 1 to May 30 (60 days) and November 1 to December 15 (45 days), for a total of 105 days for the year. Because her cumulative stay falls short of 180 days, Ms. Chen is not a Thai tax resident and only needs to pay tax on income sourced in Thailand.
Exceptions
Certain foreign-sourced income can qualify for special treatment: if tax has already been paid on it in the country where it was earned, a tax credit may be claimed under the relevant double tax agreement (DTA).
Certain qualifying income — for example, inheritance or maintenance/gift income not exceeding THB 20,000,000 — may qualify for tax exemption.
Filing Requirements for Long-Term Visa Holders
Under Thailand’s current tax rules, filing requirements differ by type of long-term visa holder:
O-A retirement visa, Thailand Elite visa, and Destination Thailand Visa (DTV) holders:
- If you stay in Thailand for 180 days or more in a calendar year, you are treated as a Thai tax resident.
- As a tax resident, foreign-sourced income remitted into Thailand from January 1, 2024 onward is taxable.
- Foreign-sourced income that is not remitted into Thailand is not taxable.
Long-Term Resident (LTR) visa holders:
- Highly-Skilled Professionals qualify for a preferential 17% personal income tax rate on employment income from employers in targeted industries (such as technology, healthcare, and science).
- Wealthy Global Citizens, Wealthy Pensioners, and Work-from-Thailand Professionals are exempt from tax on foreign-sourced income that is remitted into Thailand, under Royal Decree No. 743, subject to Revenue Department conditions.
How Thai Tax Law Defines Income
Thai tax law divides assessable income into eight categories:
- Wages and salary: base salary and bonuses under an employment contract, among others;
- Service and agency fees: for example, consulting fees and brokerage fees;
- Royalties: covering patents, copyrights, trademarks, and similar rights;
- Interest and dividends: bank deposit interest and dividend income;
- Rental income: income from leasing real or movable property;
- Professional service income: income from professional work such as lawyers and doctors;
- Contracting income: income from contract work or project engagements;
- Business and other income: including business operating income and gains from transferring equity.
Personal Income Tax Rates
2026 uses a progressive tax rate structure, as follows:
| Income Bracket (THB) | Tax Rate |
|---|---|
| 0 – 150,000 | 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% |
| 5,000,001 and above | 35% |
Filing Process and Methods for Foreigners in Thailand
Filing Deadlines
- Paper filing: by March 31 each year
- Online filing: by April 8 each year
Filing Methods
In-person filing
- Taxpayers living in Bangkok can file at one of Bangkok’s 30 area or district Revenue Offices;
- Taxpayers living in the provinces file at the relevant provincial or district Revenue Office;
- Filing uses Form P.N.D. 90 or P.N.D. 91.
Online filing
- Log in at the Revenue Department’s website (www.rd.go.th) or use the RD Smart mobile app;
- Select the P.N.D. 90 or P.N.D. 91 filing service;
- First-time users need to register an account;
- Enter details of income, deductions, and other required information;
- Confirm the information and submit — the system automatically calculates the tax due.
Notes
- Foreigners must apply for a Tax Identification Number and taxpayer card within 60 days of earning income;
- Staying 180 days or more is treated as tax residency, requiring worldwide income to be declared;
- Staying less than 180 days means only Thailand-sourced income is taxable;
- Various deductions can be claimed, such as personal/spouse/child allowances, insurance premiums, and retirement contributions;
- Online filing is recommended, as it can extend the filing deadline and makes electronic payment more convenient.
Allowances and Deductions
Foreigners in Thailand are entitled to similar personal allowances and deductions. Under Thai tax law, the main allowances and deductions include:
Personal Allowance and Family Deductions
- Personal allowance: THB 60,000 per person;
- Spousal allowance (if the spouse has no income): THB 60,000;
- Child deduction: THB 30,000 per child;
- Second and subsequent children born from 2018 onward: THB 60,000 per child.
Insurance-Related Deductions
- Life insurance premium deduction: up to THB 100,000;
- Health insurance premium deduction: up to THB 25,000.
Retirement and Savings-Related Deductions
- Retirement Mutual Fund (RMF) contributions: up to 30% of assessable income, capped at THB 500,000;
- Super Savings Fund (SSF) investment: up to 30% of assessable income, capped at THB 200,000;
- Provident Fund (PVD) contributions: up to 15% of income, capped at THB 500,000.
Other Deductions
- Mortgage interest deduction: up to THB 100,000;
- Social Security Fund contributions: the actual amount paid;
- Charitable donations: up to 10% of income remaining after the standard deduction and allowances.
Please note: some deductions are subject to combined caps. For example, the combined deduction for life insurance and health insurance may not exceed THB 100,000. Retirement- and savings-related deductions combined are also capped at THB 500,000.
These allowances and deductions apply to tax residents in Thailand, including qualifying foreigners. Non-residents, however, may only be able to claim these benefits against Thailand-sourced income.
Further reading: 2026 summary of deductions and exemptions available to individual taxpayers in Thailand.
Double Tax Agreements (DTAs)
Thailand has signed double tax agreements with more than 60 countries and territories, including:
- Hong Kong–Thailand DTA: withholding tax rate of 10% on dividends, and 15% on interest and royalties;
- Taiwan–Thailand DTA: withholding tax rate of 10% on dividends, interest, and royalties;
- China–Thailand DTA: withholding tax rate of 15% on dividends (10% if the shareholding is 25% or more), 10% on interest, and 15% on royalties.
DTA benefit application process: taxpayers need to provide a certificate of tax residency or other relevant documents to apply the preferential rate. Disputes can be resolved through the Mutual Agreement Procedure (MAP).
Countries with Double Tax Agreements (DTAs)
Thailand currently has double tax agreements with more than 60 countries and territories, including: Armenia, Australia, Austria, Bangladesh, Bahrain, Belgium, Bulgaria, Canada, China, Cyprus, the Czech Republic, Denmark, Finland, France, Germany, Hong Kong, Hungary, India, Indonesia, Israel, Italy, Japan, South Korea, Laos, Luxembourg, Malaysia, Mauritius, Nepal, the Netherlands, New Zealand, Norway, Oman, Pakistan, the Philippines, Poland, Romania, Singapore, Slovenia, South Africa, Spain, Sri Lanka, Sweden, Switzerland, Taiwan, Turkey, Ukraine, the United Arab Emirates, the United Kingdom of Great Britain and Northern Ireland, the United States of America, Uzbekistan, and Vietnam.
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