Thailand – Taxation

How does the tax system in Thailand work?

Thailand operates a unified national tax structure — there are no state or regional income taxes of any kind. All matters relating to personal income tax fall under the authority of the Thai Revenue Department (TRD), a body that sits within the Ministry of Finance. This contrasts with federal systems such as those in the United States or Germany, where taxpayers may face simultaneous obligations at both national and sub-national levels. In Thailand, a single national framework governs everything related to personal income tax.

Thai tax law follows a progressive structure, whereby higher levels of income attract higher rates. Both residents and non-residents are liable for tax on assessable income arising from employment or business activities conducted within Thailand, regardless of where payment is actually received. The most consequential question for anyone relocating to Thailand is whether they qualify as a tax resident, since that status determines whether overseas income also falls within scope.

Tax residency is conferred on any person who spends an aggregate of 180 days or more in Thailand during a single tax year, which runs on a calendar basis. Even a partial day within the country is treated as a complete day for this purpose. Crucially, residency is governed solely by physical presence as set out in Section 41 of the Revenue Code — visa category, employment status, and domicile registration are all irrelevant to this determination.

Tax residents are liable for tax on income from all sources worldwide, while non-residents face tax liability only on income generated within Thailand. This distinction carries significant practical consequences for anyone planning an extended stay. Unlike pay-as-you-earn arrangements common in other countries, where an employer deducts tax at source, Thailand requires individuals to assess their own liability and submit an annual return.

Amendments to the Revenue Code that came into effect in January 2024 have considerably changed how foreign income is treated for Thai residents. Under the revised rules, Thai taxpayers who receive assessable income from overseas employment, business activities, or foreign-situated assets must pay Thai tax on that income when it is brought into Thailand. Under the old rules, only foreign income transferred to Thailand within the same calendar year it was earned was taxable. This is a fundamental shift that anyone contemplating a move to Thailand needs to fully understand in advance.

The taxability of income depends on where the underlying work, activity, or asset is situated — not on the location of the bank account receiving the payment. Prospective residents are encouraged to monitor the Revenue Department’s official website for up-to-date guidance, as this area of the law is continuing to develop.

Does Thailand have double taxation agreements, and how do they affect expats?

Thailand has concluded double tax treaties with 61 countries, with the precise mechanism for eliminating double taxation varying from one agreement to another. These treaties exist to prevent the same income from being fully taxed by two separate jurisdictions. For anyone receiving money from abroad — whether in the form of a salary, pension, dividends, or rental income — establishing whether a relevant treaty is in place is among the most important steps in preparing a move to Thailand.

These treaties give taxpayers the ability to claim credits or exemptions where income has been subject to tax in both Thailand and another country. Whether relief is available depends on the individual’s residency status and the precise terms of the applicable bilateral agreement. In practice, even where income has already been taxed in your country of origin, it may still need to be declared in Thailand — though the treaty will generally allow foreign tax paid to be offset against any resulting Thai liability.

To illustrate, consider a pension paid by a foreign government that has already been taxed at source. A relevant DTA may exempt that pension from Thai tax entirely, even when the funds are transferred to Thailand. The details, however, vary considerably between treaties. German statutory and government service pensions, for example, are taxable only in Germany under the applicable DTA, and Thailand has no taxing rights over that income regardless of where it is remitted. Pensions from other countries may be treated quite differently — it is always necessary to examine the specific treaty text.

Taxpayers who wish to avoid double taxation, or who need to establish Thai tax residency for use with foreign authorities, can request forms RO.21 and RO.22 from the Thai Revenue Department. These documents serve as official confirmation of Thai tax payment and can be submitted to overseas tax agencies or financial institutions to support treaty relief claims in other jurisdictions where tax obligations also exist.

Thailand’s complete list of double taxation agreements is available on the Thai Revenue Department’s website. Given the complexity of how individual treaties interact with Thailand’s evolving domestic rules, consulting a tax professional with international expertise before transferring significant sums into Thailand is strongly recommended.

What taxes do expats need to pay in Thailand?

Compared with many other countries, Thailand’s tax system for individuals is relatively straightforward — there is no wealth tax and no standalone capital gains tax. That said, several taxes are relevant to expatriates living in the country. The table below provides an overview of the most important ones.

Personal Income Tax

Thailand’s personal income tax operates on a progressive scale from 0% to 35%. The initial THB 150,000 of income is entirely exempt. The next THB 150,000 attracts a 5% rate, the following THB 200,000 is taxed at 10%, and rates continue rising in comparable increments up to 35% on income exceeding THB 5 million. As of 2025, these bands are still in effect — the Revenue Department should be consulted regularly, as thresholds may be adjusted over time.

A filing obligation generally arises when annual income exceeds THB 120,000 for a single taxpayer, or THB 220,000 for a married taxpayer. These relatively low thresholds mean that many expatriates are required to submit annual returns even in circumstances where tax has already been deducted at source throughout the year.

Once residency is established, expatriates must determine which of their income sources falls within Thailand’s definition of assessable income. Employment earnings, bonuses, housing allowances, director fees, consulting income, rental receipts, and investment returns may all be subject to tax where they are connected to economic activity in Thailand. The key factor is typically where the income-generating activity occurs, rather than where the receiving bank account is located.

Capital Gains

Profits from the disposal of shares are generally included in personal income tax assessments. However, gains arising from the sale of securities listed on the Stock Exchange of Thailand are exempt. Gains from the sale of real property are subject to personal income tax, with a standard allowance available based on the period of ownership. There is no separate capital gains tax regime — such gains are instead incorporated into personal income tax as assessable income.

Inheritance and Gift Tax

Thailand introduced an inheritance tax in 2016. Assets passing to direct descendants or ascendants are taxed at 5% on the portion above THB 100 million, while other beneficiaries are subject to a 10% rate on amounts exceeding that threshold. Gifts received from parents or spouses above THB 20 million in a single tax year, or gifts from any other person exceeding THB 10 million, attract a gift tax rate of 5%. These thresholds are high enough that most expatriates will not be affected, but those with substantial assets should seek specialist advice and confirm current figures with the Revenue Department.

Property Tax

Thailand’s Land and Building Tax is levied on owners of land, buildings, and condominiums, with rates varying according to whether the property is used for residential, agricultural, commercial, or other purposes, and administered by local authorities. A reduced rate applies to principal residences. Foreign residents who own condominiums in their own name are subject to identical land and building tax obligations as Thai nationals.

Social Security

Thailand’s social security system functions in a manner broadly comparable to national insurance contributions elsewhere, but for most expatriates it applies only to those holding valid work permits and employed by companies registered in Thailand. Contributions are calculated at 5% of monthly salary, subject to a relatively modest ceiling — current caps can be confirmed with the Social Security Office. Self-employed individuals and retirees are generally not required to make social security contributions.

Cryptocurrency and Digital Assets

Under Revenue Code Amendment No. 19, profits derived from trading cryptocurrency or other digital assets are treated as assessable income and are subject to standard personal income tax rates. This applies to gains from both Thai sources and foreign sources that are remitted to Thailand.

Are there any tax breaks or special regimes for expats in Thailand?

Thailand does not offer a general non-domicile framework or a broadly available remittance-basis arrangement comparable to Portugal’s former NHR scheme or Italy’s flat-tax option for new arrivals. Nevertheless, two meaningful preferential mechanisms exist for certain categories of foreign resident: the Long-Term Resident (LTR) Visa tax exemption, and a range of deductions and allowances accessible to all taxpayers.

The Long-Term Resident (LTR) Visa

Thailand’s Long-Term Resident visa programme launched on 1 September 2022 and is designed to draw high-potential foreign nationals to the country through a combination of tax and non-tax incentives. One of the principal tax benefits available to LTR visa holders is an income tax exemption under Royal Decree No. 743, issued under the Revenue Code. This exemption covers income from employment, overseas business activities, or foreign-situated property that is brought into Thailand.

Three categories of LTR Visa holder are eligible for this exemption: Wealthy Global Citizens, Wealthy Pensioners, and Work-from-Thailand Professionals. The LTR Visa is the only visa type that explicitly provides a 0% effective rate on foreign-sourced income remitted to Thailand for qualifying wealthy pensioners and remote professionals. This makes it a particularly powerful planning instrument for those who qualify — especially retirees transferring pension or investment income and remote workers whose employer is based abroad.

Highly Skilled Professionals working in industries targeted by the Board of Investment benefit from a preferential flat income tax rate of 17%, substantially below the standard progressive ceiling. This predictable rate simplifies financial planning and is designed to attract specialist expertise into Thailand’s priority sectors. Applicants must work for eligible organisations and comply with filing requirements under the BOI framework to qualify.

The Thai government has relaxed several LTR Visa requirements to broaden the programme’s appeal. Notable changes include the removal of a minimum income requirement for Wealthy Global Citizens, eased or eliminated work experience thresholds for certain Highly Skilled Professionals, and a reduced employer revenue threshold for Work-from-Thailand Professionals. Dependent eligibility has also been expanded to include parents and same-sex spouses. Full eligibility criteria and application procedures are managed by the Board of Investment (BOI).

Deductions and Allowances for All Taxpayers

All taxpayers may deduct 50% of their employment income from their assessable income, up to a ceiling of THB 100,000, though business-related expenses cannot be separately claimed against this deduction. Personal allowances include THB 60,000 for the taxpayer and the same amount for a non-earning spouse, plus THB 30,000 per child with an additional allowance for children born from 2018 onwards.

Contributions to approved organisations — including educational, healthcare, religious, and charitable institutions — are deductible up to 10% of income after other deductions have been applied. Certain categories of donation, such as those benefiting education or healthcare projects, may qualify for a double deduction, though the combined total remains capped at 10% of income. Life insurance premiums are deductible up to THB 100,000, provided the policy runs for a minimum of ten years and the insurer is registered in Thailand. All figures are as of 2025 and should be confirmed with the Revenue Department each year.

Pre-2024 Income Protection

The revised Thai tax rules do not apply retrospectively to foreign income generated before 1 January 2024, meaning funds earned and deposited offshore prior to 31 December 2023 remain outside the scope of Thai tax under current guidance. However, taxpayers must be in a position to demonstrate both the origin and the date of those funds if queried. This is a significant planning consideration for anyone with accumulated pre-2024 savings.

How and when do expats file a tax return in Thailand?

The Thai tax year runs from 1 January to 31 December. Returns covering the preceding tax year are generally due by 31 March, with an extended deadline of 8 April available for those filing electronically, or later where a formal extension has been granted. The e-filing extension is a practical advantage for those who prefer to manage their tax affairs digitally.

The step-by-step process for filing a personal income tax return in Thailand is as follows:

1. Determine your residency status. Count the total number of days spent in Thailand over the calendar year. Anyone present in Thailand for 180 days or more during a calendar year is a Thai tax resident for that year. Even a partial day counts as a full day. Non-residents are only required to file for Thai-sourced income that exceeds the applicable threshold.
2. Obtain a Tax Identification Number (TIN). Before a personal income tax return can be submitted, individuals earning taxable income in Thailand must hold a Thai Tax Identification Number. This is issued by the Thai Revenue Department and is commonly arranged at the start of employment or when submitting the first return.
3. Gather your income documentation. Assemble records covering all assessable income — both Thai-sourced and foreign income remitted to Thailand — together with bank statements, payslips, and any relevant certificates from foreign tax authorities relating to DTA claims.
4. Calculate your assessable income. Taxable income is derived by reducing total assessable income by all applicable deductions and personal allowances before applying the progressive tax rates to the resulting figure.
5. Choose the correct return form. Taxpayers whose income consists solely of employment earnings generally file Por Ngor Dor 91 (PND 91). Those with additional income streams — such as consulting fees, rental receipts, or investment returns — must instead use Por Ngor Dor 90 (PND 90).
6. File online or in person. Returns may be submitted electronically via the Revenue Department’s e-filing portal, which includes an English-language interface, though the translation quality may vary. Alternatively, returns can be filed in person at the relevant local Revenue Department office.
7. Pay any tax due. Any outstanding liability must be settled by the filing date. Where tax has been withheld by a Thai employer during the year, this amount is credited against the final assessment. Overpayments may be reclaimed as a refund.
8. Retain all documentation. The Revenue Department may examine up to five years of historical records during an audit, or up to ten years where evasion is suspected. Bank statements, remittance records, and documentation supporting all declared income should be retained throughout this period.

Failure to file, underreporting income, or providing false information may attract penalties under Sections 39–42 of the Revenue Code, including financial surcharges, fines, and audit proceedings. Given the potential consequences, professional support is common among expatriates. Current deadlines, forms, and access to the e-filing system are all available through the Revenue Department’s official portal.

What are the tax implications of leaving Thailand?

Thailand does not currently impose a formal exit tax on unrealised gains when a person ceases to be a tax resident — there is no equivalent of the exit taxation regimes found in certain European countries. Nonetheless, departing Thailand carries meaningful tax obligations that must not be disregarded.

Since Thai tax residency is assessed on a calendar-year basis, the consequences of departure depend on timing. If you leave Thailand during the year and your total presence for that calendar year amounts to fewer than 180 days, you will not be regarded as a tax resident for that year. However, if you depart after having already been in Thailand for 180 or more days, you remain a tax resident for the full calendar year and must submit a return covering all assessable income for that period.

Income earned during a year in which you do not meet the residency threshold is not taxable on remittance, because the residency condition was never satisfied. Thoughtful planning around the timing of departure — combined with careful management of when foreign income is transferred — can therefore make a material difference to your tax position. Professional advice should be sought well before any planned departure date.

Where you have previously been filing Thai tax returns, the obligation continues for every year in which you met the 180-day threshold, even after you have physically left the country. Thailand has no formal deregistration procedure comparable to filing a departure return in Canada or notifying the UK’s HMRC of a change of tax residence. Residency simply ceases to apply in any subsequent year where the day-count threshold is not reached.

Ongoing obligations may persist after you leave if you continue to hold income-producing assets in Thailand — such as rental property or Thai-source investments. Rental income from Thai property remains subject to Thai tax regardless of whether the property owner is a resident, and non-residents remain liable for personal income tax on all Thai-sourced income. Retaining Thai assets after departing the country does not relieve the obligation to file for income they generate.

Thailand joined the Common Reporting Standard (CRS) and Automatic Exchange of Information (AEOI) frameworks, and from September 2023 the Thai Revenue Department has been able to receive financial data from other CRS-affiliated revenue authorities. Both incoming and departing tax residents should therefore expect a high degree of financial transparency between jurisdictions. Anyone leaving Thailand with unresolved tax obligations should resolve these before departure to avoid future complications.

Practical tips for managing taxes as an expat in Thailand

• Begin tracking your days in Thailand from the moment you arrive. The 180-day threshold is the sole determinant of tax residency, and any fraction of a day counts as a whole day. Use a dedicated calendar, spreadsheet, or travel-tracking app to log entries and exits, and hold onto passport stamps or flight records as supporting evidence.
• Keep pre-2024 funds clearly segregated. Maintaining separate bank accounts for funds accumulated before 2024, retaining year-end account statements, and labelling international transfers clearly will all support any future exemption claim. Should the Revenue Department query the origins of money brought into Thailand, this documentation will be essential.
• Read the double taxation agreement between Thailand and your home country before transferring money. Thailand’s full list of DTAs is available on the Revenue Department’s website. Understanding which country holds taxing rights over each category of your income before you remit can prevent unnecessary double taxation and reduce filing complexity.
• Register for a Tax Identification Number promptly. Even where your tax liability is negligible, many advisors recommend obtaining a TIN and submitting a nil or low-value return to establish a clean compliance record with the Revenue Department. This can prove valuable if your circumstances change in subsequent years.
• Assess whether the LTR Visa suits your income profile. LTR visa holders qualifying under the relevant category are exempt from Thai income tax on foreign-sourced income remitted to Thailand, making it a legitimate route to tax efficiency for eligible retirees, investors, and remote workers. Compare the entry requirements carefully against your specific income sources before applying.
• Take the CRS reporting environment seriously. More than 120 countries participate in the Common Reporting Standard, through which foreign account balances are automatically shared with Thai tax authorities on an annual basis. The assumption that offshore income will go unnoticed is increasingly difficult to sustain given the sophistication of current reporting infrastructure.
• Engage a tax professional with specific cross-border expertise. The interaction between Thai domestic rules and international tax law is complex and continuing to evolve. Expatriates are strongly advised to work with advisors experienced in both Thai and international taxation to ensure filings across all relevant jurisdictions are coordinated and fully compliant. The cost of expert guidance is almost invariably less than the cost of penalties, errors, or missed treaty relief.
• Think carefully before completing major asset disposals. Gains on property sales and share disposals are incorporated into assessable income for personal income tax purposes. Timing a disposal in a year when your total Thai assessable income is lower — or in a year when you are not a Thai tax resident — can considerably reduce your overall liability. Always take specific advice before finalising significant transactions.

Frequently asked questions

Am I a tax resident in Thailand if I retire there?

Spending 180 days or more in Thailand in a calendar year is what makes you a Thai tax resident for that year — holding a retirement visa does not automatically confer that status. Residency is determined entirely by the number of days you are physically present in Thailand within a given calendar year. Those who divide their time between Thailand and one or more other countries may not reach the threshold in every year.

Is my foreign pension taxable in Thailand?

In most cases, transferring your pension to Thailand will expose it to personal income tax, subject to two principal exceptions: the pension accrued before 2024, or a double taxation agreement between Thailand and your home country provides that the pension — typically one paid by a government — is taxable only in the country of origin. Private pension income derived from investment returns is more likely to be taxable if remitted. It is advisable to keep thorough pension records in the event of a query from the Revenue Department.

Does Thailand tax worldwide income?

Thailand taxes both residents and non-residents on assessable income arising from employment or business conducted within Thailand. For residents, foreign income earned from 1 January 2024 onwards becomes taxable in Thailand when it is remitted, whether in the same or a later tax year. Foreign income that remains offshore and is never brought into Thailand is currently not subject to Thai tax, though this position could change if proposed legislation introducing a worldwide income basis is enacted.

When is the deadline for filing a Thai personal income tax return?

Returns for a given tax year must generally be lodged by 31 March of the following year, with an extended deadline of 8 April available to those filing electronically, subject to any further extension the Revenue Department may announce. For instance, returns covering the 2025 calendar year would ordinarily be due by 31 March 2026. The current deadline should always be verified on the Revenue Department’s website, as extensions are occasionally granted.

Can I file my Thai tax return online?

Yes. The Thai Revenue Department’s e-filing portal accepts online submissions and provides an English-language interface, though the quality of translation can sometimes be inconsistent. Taxpayers with several different income streams may find it challenging to allocate figures to the correct categories without assistance. Filing in person at your local Revenue Department office remains a viable alternative, particularly where tax affairs are more involved.

What happens if I miss the tax filing deadline?

Late submission or the provision of incorrect information can result in escalating financial penalties. Deliberately providing false information may lead to more serious legal consequences. Penalties under Sections 39–42 of the Revenue Code include fines, surcharges, and the possibility of audit proceedings. If you discover that you have missed a filing deadline, the best course of action is to submit the return and pay any outstanding tax as quickly as possible in order to limit the accumulation of additional charges.

Is there capital gains tax in Thailand?

Thailand does not operate a standalone capital gains tax. Gains from asset disposals are instead treated as assessable income and included in the personal income tax calculation at the standard progressive rates. Profits from selling securities listed on the Stock Exchange of Thailand are exempt from tax. Gains from the disposal of real property and unlisted shares are generally taxable. Foreign capital gains remitted to Thailand by tax residents in respect of income earned from 2024 onwards are also potentially assessable.

Does using a foreign credit card in Thailand trigger a tax liability?

Under current guidance, there is no legal requirement to file a Thai tax return solely on the basis of using an international credit card for expenditure in Thailand and repaying the balance from overseas funds. However, ATM withdrawals and purchases made with foreign cards in Thailand may in some circumstances be characterised as remittances and should be treated with care. The legal position on this point has not been fully settled and may be clarified by future Revenue Department guidance. Anyone relying on this method for a significant portion of their living costs should seek specialist advice.