If you live, work, invest or retire in Thailand, one of the most important tax questions is also one of the most basic: What income can Thailand actually tax?
The answer is not simply everything you receive worldwide. It is also not determined just by where your money is paid or where your bank account is located.
Thailand’s personal income tax rules look first at what the money represents, then at the type and source of the income. Tax residence, exemptions, Double Tax Agreements and, for foreign source income, remittance can then affect the final position.
For most expats, the clearest approach is therefore to look at each source of income separately.
Key Points
- Thailand’s Revenue Code divides assessable income into eight categories under Section 40.
- Thai source income can fall within Thai tax whether or not you are Thai tax resident.
- Where your income is paid does not by itself determine whether it is Thai source or foreign source. If you perform the work in Thailand, the salary can be Thai source even if your employer is overseas and the money is paid into a foreign bank account.
- Foreign source income follows additional rules concerning the year the income was derived, Thai tax residence and whether the income is brought into Thailand.
- Not every transfer into Thailand is income. Savings, capital, loans, gifts, inheritances and asset sale proceeds can require different treatment.
- Assessable income, taxable income and tax payable are different concepts. Expenses, deductions, allowances, exemptions, withholding tax, Double Tax Agreements and foreign tax credits can all affect the final result.
First Identify What the Money Represents
Before deciding whether money is taxable, establish what it represents.
Money you receive or transfer might be:
- Salary or employment income
- Pension income
- Dividends or interest
- Rental income
- Business or consultancy income
- An investment gain
- Existing savings or capital
- Proceeds from selling an asset
- A loan or repayment of a loan
- A gift
- An inheritance
Those amounts can have very different tax consequences.
Suppose THB 2 million arrives in a Thai bank account.
That fact alone is not enough to decide the tax treatment.
The money might be current pension income. It might be savings accumulated years earlier. It could be the proceeds from selling shares, repayment of a loan or an inheritance.
Even sale proceeds need to be analysed carefully. If an investment bought for THB 1.5 million is later sold for THB 2 million, the fact that THB 2 million was received does not automatically mean THB 2 million is income. The original capital, any gain, the nature of the asset and other relevant rules all need to be considered.
The first principle is therefore simple:
Do not classify money by the fact that it moved. Establish what the money actually represents.
What Does ‘Assessable Income’ Mean?
Thai tax law uses the term assessable income.
Section 39 of the Revenue Code defines assessable income broadly and can include income received in money, property or another benefit capable of being given a monetary value. Section 40 then divides assessable income into eight categories.
However, assessable income does not necessarily mean the whole amount will be taxed or that additional tax will be payable.
It is useful to distinguish between:
- Assessable income — income that falls within the Thai personal income tax system
- Taxable income — the amount remaining after relevant exemptions, expenses, deductions and allowances
- Tax payable — the final tax due after the calculation and any available withholding tax or tax credits
An amount can therefore be assessable income while exemptions, allowable expenses, deductions, personal allowances, withholding tax, Double Tax Agreements or foreign tax credits reduce the amount ultimately payable.
Identifying assessable income is the first stage of the tax calculation, not the final answer.
The Eight Categories of Assessable Income Under Section 40
Section 40 divides assessable income into eight broad categories.The category matters because different types of income can receive different treatment for expenses, exemptions, withholding and calculation of tax.
For an expat, however, identifying the Section 40 category is only part of the analysis.
The next major question is where the income arises.
Is the Income Thai Source or Foreign Source?
Section 41 of the Revenue Code distinguishes between income connected with Thailand and relevant income arising abroad.
Thai Source Income
Income can be Thai source where it results from work performed in Thailand, business carried on in Thailand or property situated in Thailand.
Common examples include:
- Salary for duties performed in Thailand
- Consultancy work carried out in Thailand
- Rent from a Thai condominium
- Income from a business carried on in Thailand
- Income from relevant Thai assets or property
Thai source income can fall within Thai personal income tax even where the recipient is not Thai tax resident.
Foreign Source Income
Foreign source income can include income arising from work, business, property or investments outside Thailand.
Common examples include:
- Salary relating to employment duties performed abroad, although the full Section 41 source test and wider circumstances must also be considered
- Rent from overseas property
- Overseas pensions
- Foreign dividends and interest
- Relevant gains from overseas investments
- Income from business activity carried on abroad
Foreign source income then requires an additional analysis involving tax residence and remittance.
Where the Money Is Paid Does Not Decide Its Source
One of the most common misunderstandings is that income paid overseas must be foreign source.
That is not necessarily the case.
If you live in Thailand and perform employment duties here for a British, Australian or American company, the fact that your employer is overseas and your salary is paid into an overseas bank account does not by itself make the remuneration foreign source.
Section 41 brings income from employment or business carried on in Thailand within the Thai tax system whether that income is paid in Thailand or elsewhere.
Where duties are divided between countries, or the income is connected with the business of an employer in Thailand, the source analysis can become more complicated. An applicable Double Tax Agreement may also affect the result.
Foreign Source Income Has an Additional Test
Once income has been identified as foreign source assessable income, additional rules apply.
The Revenue Department’s current interpretation is set out principally in Departmental Instruction Por.161/2566, as amended by Por.162/2566.
For income derived from 1 January 2024 onwards, the current framework focuses on two central questions:
- Were you Thai tax resident in the calendar year in which the foreign income was derived?
- Was that foreign income brought into Thailand in the year it was derived or in a later year?
An individual is generally Thai tax resident for a calendar year if they spend an aggregate of 180 days or more in Thailand during that year.
The Revenue Department’s current Foreign Tax Credit Calculation Tool manual sets out this resident year and remittance framework.
Income derived before 1 January 2024 receives different treatment under Por.162/2566.
Our guide to Understanding Assessable Foreign-Sourced Income in Thailand explains the next stage in detail, including pre-2024 income, non-resident years, remittances, mixed accounts, tracing and evidence.
When Foreign-Source Income Can Enter the Thai Tax Calculation
This article is concerned mainly with identifying and classifying the income.
Our guide to Understanding Assessable Foreign-Sourced Income in Thailand explains the next stage in detail, including pre-2024 income, non-resident years, remittances, mixed accounts, tracing and evidence.
Proposed Change to the Remittance Rules
The Revenue Department has proposed an exemption for qualifying foreign income brought into Thailand in the year it is derived or the following year.
As at 31 August 2026, this proposal has not become law.
The current rules described above therefore continue to apply. Anyone planning a substantial foreign income remittance should check the rules in force at the time of the transfer rather than relying on the proposed exemption.
How Common Expat Income Is Classified
The principles become clearer when applied to the income sources expats commonly receive.
Salary and Employment Income
Salary, wages, bonuses and employment benefits generally fall within Section 40(1).
Where the duties are performed is an important part of the source analysis, but it is not the only factor Section 41 can make relevant.
Salary attributable to work performed in Thailand can be Thai source even where:
- The employer is overseas
- The contract is governed by foreign law
- Salary is paid overseas
- The money remains in an overseas bank account
Where duties are performed abroad, the income may be foreign source, but the full Section 41 source test still needs to be considered, including whether the income arises from the business of an employer in Thailand.
If duties are performed partly in Thailand and partly overseas, an allocation may be required.
Remote Working
Remote working can cause particular confusion.
Working online does not mean the work takes place wherever the client, employer or computer server is located.
If you are physically in Thailand performing the work, there can be Thai source income consequences.
Someone living in Thailand while working remotely for an overseas employer should therefore not assume that all salary is foreign source merely because payment comes from abroad.
Pensions
Pensions are expressly included within Section 40(1), but not every pension has the same overall tax treatment.
It can be useful to distinguish between:
- State or social security pensions
- Government service pensions
- Occupational pensions
- Private pensions
- Annuities and other retirement arrangements
An overseas pension will commonly be foreign source, but an applicable Double Tax Agreement can affect which country has the right to tax it and whether relief is available.
Government service pensions in particular can receive different treaty treatment from private pensions.
Pension income should therefore be classified first, then the relevant treaty and foreign income rules considered separately.
Dividends and Interest
Interest and dividends generally fall within Section 40(4).
For overseas investments, the questions can include:
- Where the income originates
- When it was derived
- Whether the recipient was Thai tax resident that year
- Whether the income was brought into Thailand
- Whether foreign tax has already been paid
- Whether a DTA affects the outcome
Investment Gains
Thailand does not apply one standalone capital gains tax regime to every disposal by an individual.
Certain gains instead fall within the personal income tax rules according to the nature of the asset and transaction. Section 40(4), for example, includes specified gains arising from transfers of shares and other financial interests.
Qualifying gains from securities sold on the Stock Exchange of Thailand can be exempt from personal income tax, while gains from other investments may receive different treatment.
It is also important not to confuse sale proceeds with income or gain. The full amount received may include the return of the investor’s original capital as well as an assessable amount.
However, the taxable amount is not always calculated simply as sale proceeds less original cost. Different rules can apply depending on the asset. Thai immovable property, for example, has specific statutory valuation and tax calculation rules.
Rental Income
Rent from property situated in Thailand is generally Thai source income.
Rent from property situated overseas is generally foreign source income.
An expat receiving rent from a UK, Australian or other overseas property may therefore have to consider both the foreign income rules in Thailand and tax in the country where the property is situated.
Business, Freelance and Consultancy Income
The location of the client does not by itself determine the source.
The nature of the work, where it is performed and where the underlying business activity takes place can all matter.
This is particularly relevant to consultants, freelancers and online business owners who live and work from Thailand while being paid by overseas clients.
Cryptocurrency and Digital Assets
Cryptocurrency and digital assets can produce several different types of income or gains.
These can include:
- Gains on disposal
- Mining income
- Staking rewards
- Lending returns
- Business income
- Other digital asset rewards
Thailand currently provides a specific personal income tax exemption under Ministerial Regulation No. 399 for qualifying gains above cost arising from transfers of cryptocurrency or digital tokens through a digital asset exchange, broker or dealer licensed under Thailand’s digital asset business law.
The exemption applies to qualifying gains arising from transfers between 1 January 2025 and 31 December 2029.
This does not create a general exemption for all cryptocurrency income or activity. Mining, staking, lending, DeFi activity and transactions that do not meet the statutory conditions can require separate analysis.
Our guide to the Thailand crypto tax exemption for 2025–2029 explains who qualifies, which transactions are covered and the conditions that apply.
Money Brought Into Thailand Is Not Always Income
Some amounts brought into Thailand may represent existing capital or other receipts rather than current income. Common examples include savings, loans, asset sale proceeds, gifts and inheritances.
Existing Savings and Capital
Savings or capital accumulated in earlier periods are not treated as new income merely because they are moved between bank accounts or transferred to Thailand.
The difficulty is often proving what a later transfer actually represents.
That tracing question is dealt with in detail in our foreign sourced income guide.
Loans and Loan Repayments
Borrowed money and genuine repayment of capital lent are not the same thing as earnings.
The underlying transaction and supporting evidence matter.
Asset Sale Proceeds
The proceeds from an asset sale can contain more than one component.
For example, they may include:
- Original invested capital
- An assessable gain
- Amounts receiving a specific exemption
The whole bank receipt should therefore not automatically be labelled income.
Gifts
Thailand has specific personal income tax exemptions for qualifying gifts.
Under Section 42, qualifying maintenance, support and gifts from an ascendant, descendant or spouse can be exempt up to THB 20 million in a tax year.
For other persons, the THB 10 million exemption is narrower. It can apply to qualifying maintenance or support for moral purposes, and to qualifying gifts received at ceremonies or on occasions recognised by custom and tradition.
For amounts falling above the relevant exemption, the Revenue Code provides a 5% elective tax treatment in specified cases.
However:
Calling a transfer a ‘gift’ does not necessarily make it a gift for tax purposes.
The actual nature of the transaction, relationship between the parties and statutory conditions need to support that treatment.
Inheritances
Amounts received by inheritance are generally exempt from ordinary personal income tax under Section 42.
Thailand has a separate Inheritance Tax Act. Generally, inheritance tax can apply to the value received above THB 100 million from each deceased person, with a 5% rate for ascendants and descendants and a 10% rate for other taxable heirs. A legal spouse is exempt.
Exemptions and Special Tax Treatment
Even where income falls within Section 40, another rule may exempt it or change how it is taxed.
One important example for expats is Thailand’s Long-Term Resident visa regime.
Royal Decree No. 743 provides a foreign income exemption for qualifying foreigners in the Wealthy Global Citizen, Wealthy Pensioner and Work-from-Thailand Professional categories where the statutory conditions are satisfied.
The Highly Skilled Professional category has different tax treatment and can qualify for a 17% personal income tax rate on specified Thai employment income, subject to the relevant conditions.
Other income can benefit from its own statutory exemptions, such as the current qualifying digital asset exemption.
The important point is:
First identify the income correctly. Then check whether a specific exemption or special rule changes the result.
What If the Same Income Is Taxed Overseas?
Cross-border income can potentially fall within the tax systems of more than one country.
Thailand currently has Double Tax Agreements with over 60 countries, according to the Revenue Department’s current Foreign Tax Credit Calculation Tool manual.
Depending on the treaty and income involved, a DTA may:
- Allocate or restrict taxing rights
- Provide an exemption
- Allow relief through a foreign tax credit
Foreign tax already paid does not automatically create a credit in Thailand.
The Revenue Department’s current foreign tax credit process requires the treaty position, source country, type of income, tax paid and applicable Thai credit limit to be considered.
Our guide to How Double Tax Agreements and Foreign Tax Credits Work in Thailand explains this in detail.
Does Having Assessable Income Mean You Need to File?
The requirement to file a Thai tax return is separate from the amount of tax ultimately payable.
Section 56 sets different general thresholds depending on the taxpayer’s circumstances and the type of income.
For an unmarried taxpayer, the general threshold is more than THB 60,000 of assessable income, rising to more than THB 120,000 where the income consists only of Section 40(1) income.
For a married taxpayer, the corresponding general thresholds are more than THB 120,000, or more than THB 220,000 where the income consists only of Section 40(1) income.
Expenses, allowances, withholding tax or foreign tax credits can result in little or no additional tax being payable, even when a filing obligation still exists.
See Do I Need to File a Thai Tax Return? A Guide for Expats for the detailed filing rules.
A Simple Framework for Checking Each Income Source
If you receive several forms of income, do not start by asking:
‘Am I taxable in Thailand?’
Take each source separately and ask:
- What does the money represent?
- Is it income rather than capital or another type of receipt?
- Which Section 40 category applies?
- Is the income Thai source or foreign source?
- If it is foreign source, what residence and remittance rules apply?
- Is there an exemption or special tax treatment?
- Does a Double Tax Agreement or foreign tax credit affect the result?
- Does the income create a filing obligation?
This approach is especially important where you have pensions, investments, property income, business income or money coming from several countries.
Need Help Understanding Your Thai Tax Position?
Thai tax can become complicated when you have income, assets or tax obligations in more than one country.
Expat Tax Thailand specialises in helping expats understand how the Thai tax rules apply to their wider financial position. We can review your revenue sources, identify where Thai tax may apply and consider any relevant exemptions, Double Tax Agreements or foreign tax credits.
If you are unsure how your income should be treated in Thailand, book a free call with our team to get clrity on your Thai tax position.
