Last updated: September 2026 to reflect current TRD guidance on foreign-sourced income.
If you live in Thailand but receive money from overseas, you may be wondering whether bringing that money into Thailand creates a Thai tax liability.
Sometimes it can. Sometimes it does not.
Thailand’s treatment of foreign-sourced income changed after the Revenue Department issued a new interpretation in September 2023. The revised treatment applies from 1 January 2024 and makes the timing of income, Thai tax residence and remittances particularly important.
That does not mean every transfer from overseas is taxable.
You first need to establish what the money represents, which Thai tax year any foreign income relates to, whether you were Thai tax resident in that year and whether the income was brought into Thailand.
This guide explains how the current foreign-income rules work, including pre-2024 income, income from non-resident years, remittances, mixed accounts and the records you may need.
If you are not yet sure whether your money is income, capital or something else, our guide to What Income Is Taxable in Thailand? explains that first step.
What Does ‘Derived’ Mean?
The Revenue Department uses the term ‘derived’ when referring to the tax year in which income is treated as arising for tax purposes.
We use that term throughout this guide because not every type of income is naturally described as being ‘earned’. Salary may be earned, while pensions, dividends, interest and investment gains arise in different ways.
The year income was derived matters because it helps determine whether you were Thai tax resident in that year and whether the current foreign-income rules apply.
Key Points
- Thailand’s personal income tax year runs from 1 January to 31 December.
- Foreign income is considered based on the year it was derived. If you were Thai tax resident in that year, the income can fall within the current foreign-income rules.
- The income must also be brought into Thailand before it enters the Thai tax calculation under the current remittance rules.
- The revised treatment applies to relevant foreign income derived from 1 January 2024 onwards.
- Foreign income derived before 1 January 2024 is not caught by the revised post-2024 remittance treatment.
- Foreign income derived during a year when you were not Thai tax resident is not brought within the current rule simply because you later become resident in Thailand.
- The year the income is derived and the year you bring it into Thailand can be different.
- A transfer from overseas does not tell you whether the money is income, savings, capital or a mixture.
- Mixed accounts can contain money from different years with different tax treatment, making records and tracing particularly important.
- Exemptions, Double Tax Agreements and foreign tax credits can still change the final amount of Thai tax payable.
What Counts as Foreign-Sourced Income?
Before applying the foreign-income remittance rules, first ask a more basic question:
Is the money actually foreign income?
Money transferred from overseas is not automatically foreign-sourced income.
It could represent:
- Income earned overseas
- Existing savings or capital
- Repayment of a loan
- An inheritance
- Proceeds from selling an investment
- A mixture of several different types of money
If it is income, the next question is where that income arose. For example, salary paid into a UK bank account is not necessarily foreign-sourced income.
If you performed the work while physically in Thailand, the salary can be Thai-source income even though your employer and bank account are overseas.
The rules in this guide apply specifically to assessable income arising outside Thailand.
If you are unsure how your money should be classified, start with our broader guide to assessable income, Section 40 and the difference between Thai-source and foreign-source income.
How Thailand Taxes Foreign-Sourced Income
Thailand’s current treatment of foreign-sourced income is based on Section 41 of the Revenue Code together with Revenue Department Instructions Por.161/2566 and Por.162/2566.
For most readers, the practical rule can be reduced to two main questions.
1. Were You a Thai Tax Resident When the Income Was Derived?
Thailand uses the calendar year for personal income tax.
You are generally Thai tax resident for a calendar year if you spend an aggregate of 180 days or more in Thailand during that year.
For the foreign-income rules, the important question is whether you were Thai tax resident in the year the income was derived.
So, if the foreign income was derived in 2025, you need to establish whether you were Thai tax resident in 2025.
2. Was That Foreign Income Brought into Thailand?
If you were Thai tax resident in the year the foreign income was derived, the next question is whether that income was brought into Thailand.
The remittance can happen in the same year or in a later year.
For example, if foreign income was derived in 2025 and you brought it into Thailand in 2026:
- Your 2025 tax residence matters because that is the year the income was derived
- 2026 is the year the remitted income enters the Thai tax calculation
The year the income was derived and the year it was remitted therefore do not have to be the same.
Why 1 January 2024 Matters
The date 1 January 2024 is the main dividing line under the current foreign-income rules.
Income Derived Before 1 January 2024
Revenue Department Instruction Por.162/2566 is an official Revenue Department instruction that clarifies how the foreign income rules apply.
It provides that the revised treatment introduced by Por.161/2566 does not apply to foreign assessable income derived before 1 January 2024.
In practical terms, qualifying income from before 2024 is not brought within the current post-2024 remittance rules simply because you transfer it to Thailand later.
For example, you may have earned employment income overseas in 2022 and 2023 and kept the resulting savings abroad.
Bringing some of those funds into Thailand in 2026 does not make that historic income subject to the post-2024 remittance treatment.
However, you may need records showing when the underlying income was derived.
Bank statements, payslips, pension records or investment statements can help support the position that the funds relate to income derived before 1 January 2024.
Income Derived From 1 January 2024 Onwards
For foreign income derived from 1 January 2024 onwards, the key questions are:
- Were you Thai tax resident in the year the income was derived?
- Was that income brought into Thailand?
If both conditions apply, the income is generally included in the Thai tax calculation under the current rules.
Which Tax Year Does the Income Relate To?
The Revenue Department uses the term ‘derived’ to describe the tax year to which income relates.
In practical terms, you need to establish which Thai tax year the income relates to.
For some income, this is relatively straightforward. Examples include:
- Monthly pension payments received during the year
- Salary earned during the year
- Rental income received during the year
- Interest credited during the year
- A gain made when an investment is sold
Other situations can be more complicated, including:
- Dividends
- Deferred remuneration
- Business profits
- Instalment payments
- Complex investments
- Some digital-asset transactions
The year the income was derived can affect its Thai tax treatment. It can determine whether the income falls before or after 1 January 2024 and whether you were Thai tax resident in that year.
If the correct year is unclear, you may need to look at the type of income and the documents showing when it was received or became due.
Why Your Tax Residence in That Year Matters
Your Thai tax residence can change from one year to the next. This matters because the current foreign-income rules look at whether you were a Thai tax resident in the year the income was derived.
If you were a Thai tax resident that year, the income can fall within the remittance rules when you bring it into Thailand.
If you were not a Thai tax resident that year, the income is not brought within the current remittance rule simply because you later move to Thailand and transfer the money here.
For example, if you earned income in Australia in 2024 while not a Thai tax resident, becoming a Thai tax resident in 2025 does not change the treatment of that 2024 income.
Moving to Thailand During the Year
Thailand looks at tax residence for the whole calendar year.
If you spend 180 days or more in Thailand during that year, you are generally treated as Thai tax resident for that year.
This means the date you move to Thailand can matter. Arriving earlier or later in the year may affect whether you reach the 180-day threshold and, in turn, how foreign income derived during that year is treated.
For someone planning a move to Thailand, the timing of arrival can therefore be an important part of legitimate tax planning.
This does not change the treatment of Thai-source income, which can still be taxable in Thailand even if you are not Thai tax resident.
See our Thailand Tax Residency Rules guide for the full residence rules.
How Thailand’s Foreign Income Remittance Rule Works
Foreign income and bringing that income into Thailand are separate events.
If qualifying foreign income remains overseas, it does not enter the Thai tax calculation under the current remittance rules.
If the income is later brought into Thailand, Por.161/2566 provides that it is included in the Thai tax calculation for the year in which it is brought in.
That still does not mean you will necessarily pay additional Thai tax.
The result can be affected by:
- Exemptions
- Deductions and allowances
- Double Tax Agreements
- Foreign tax credits
- Thai tax already withheld or paid
So there is an important difference between income being included in the Thai tax calculation and additional Thai tax actually being payable.
What Counts as a Remittance?
A transfer from an overseas bank account into a Thai bank account is the clearest example of money being brought into Thailand.
The Revenue Department’s foreign-income declaration and Foreign Tax Credit Calculation Tool manual require taxpayers to identify foreign income remitted into Thailand, with bank statements and transfer records used as supporting evidence.
The more difficult question is usually not whether the money moved, but what the money represented.
Other methods of bringing foreign funds into Thailand, such as card spending, ATM withdrawals and cash, can be less straightforward.
Foreign Cards and ATM Withdrawals
Published Revenue Department guidance does not clearly state that every foreign card payment or ATM withdrawal is a remittance.
However, using a foreign debit card in Thailand or withdrawing cash from an overseas account can bring foreign funds into use here.
Expat Tax Thailand therefore recommends a conservative approach: do not assume that cards or ATM withdrawals avoid the remittance rules.
Where significant amounts are involved, keep records showing how the spending was funded and what the underlying money represented.
Cash Brought into Thailand
Physical cash can also raise a remittance question.
Again, what matters is what the cash represents.
Cash from pre-2024 savings is not the same as current foreign income derived during a Thai resident year.
Cryptocurrency and Digital Assets
Crypto can be moved, sold or converted in several different ways, and those events do not all have the same tax effect.
For example, moving crypto between wallets is not the same as selling it for fiat currency and bringing the proceeds into Thailand.
Thailand also currently provides a specific exemption under Ministerial Regulation No. 399 for qualifying gains on transfers of cryptocurrency or digital tokens through licensed Thai digital asset operators between 1 January 2025 and 31 December 2029.
An offshore transaction does not qualify for this exemption simply because the proceeds are later brought into Thailand. The exemption does not cover every type of crypto income or activity.
See our guides to cryptocurrency tax in Thailand and the Thailand crypto tax exemption for 2025–2029 for the detailed rules.
What Exactly Did You Bring Into Thailand?
Once money has been transferred to Thailand, the tax question is not simply how much arrived. You also need to establish what the money represented.
The same overseas account can contain money with very different Thai tax treatment.
If, for example, USD 50,000 is transferred from an overseas account into Thailand, the Thai bank statement shows the amount received. It does not show whether that money represented:
- Pre-2024 savings
- Pension income
- Dividends or interest
- Rental income
- Investment sale proceeds
- Original investment capital
- Income from a Thai resident year
- Income from a non-resident year
Those distinctions can affect whether the transfer falls within the current foreign-income rules and how much, if any, enters the Thai tax calculation.
Income or Existing Capital?
If, for example, an overseas account already contains THB 3 million of capital and later receives THB 500,000 of foreign income, a subsequent transfer of THB 1 million to Thailand raises an important question: What did that THB 1 million represent?
It could be existing capital, foreign income or a mixture of both.
The answer depends on the history of the account and the records available. It cannot be determined simply from the amount transferred to Thailand.
Sale Proceeds or Gain?
If, for example, you bought overseas shares for THB 2 million and later sold them for THB 2.6 million, the full THB 2.6 million is not necessarily income.
Part of the amount represents your original investment and part may represent an assessable gain.
Before considering any later transfer to Thailand, those amounts need to be distinguished.
Money From Different Years
An overseas account can contain money from several different tax years, and those amounts may not all receive the same Thai tax treatment.
For example, the account might contain:
- Income derived before 2024
- Income derived while you were not Thai tax resident
- Income derived in a later year when you were Thai tax resident
Keeping all that money in the same account does not mean its tax treatment is the same.
If you later transfer money from the account to Thailand, you may need records showing which year’s funds were transferred.
Joint, Spousal and Third-Party Accounts
Where money comes from a joint account, a spouse’s account or another person’s account, you also need to establish who the money belongs to.
That can mean looking at:
- Who owned the funds
- Whose income produced them
- What the transfer represented
- What records support that position
This matters because a transfer into your Thai account is not automatically treated as your income simply because you received the money.
The Revenue Department’s foreign-income declaration also distinguishes between income belonging to the taxpayer and income belonging to a spouse.
Mixed Accounts, Tracing and Evidence
Mixed accounts can be one of the most difficult areas in practice.
If, for example, an overseas account contains:
- THB 2 million of savings accumulated before 2024
- THB 400,000 of pension income received in 2024
- THB 250,000 of dividends received in 2025
- THB 1 million of original investment capital
- THB 200,000 of investment gain
You then transfer THB 1.5 million to Thailand.
The important question is not:
How much did you transfer?
It is:
Which funds did the transfer represent?
That question can only be answered by examining the account history and available evidence.
Good Records Come First
Where possible, use actual records to show what the transfer represents.
Useful evidence can include:
- Bank statements
- Clear opening balances
- Pension statements
- Dividend and interest statements
- Brokerage records
- Sale documents
- Payslips
- Foreign tax returns
- Dates of receipts and transfers
The stronger the records, the less need there is to rely on assumptions.
How FIFO Can Help With Mixed Funds
You may see references to first in, first out, or FIFO, when mixed accounts are discussed.
FIFO assumes that the oldest money in an account is withdrawn first.
It can be used as a practical way of dealing with commingled funds where different types or years of money are held in the same account.
Where the records clearly show which funds were transferred, those records should guide the analysis.
If a substantial tax position depends on how mixed funds are allocated, the account history and supporting records should be reviewed carefully.
Why Keeping Funds Separate Helps
Where practical, keeping historic capital, pre-2024 income and later foreign income in separate accounts or clearly identifiable pools can make future remittances much easier to explain and evidence.
It can also make it much easier to show what a later transfer to Thailand represents.
Converting Foreign Income into Thai Baht
Foreign income must be converted into Thai baht for the Thai tax calculation.
The Revenue Department’s November 2025 Foreign Tax Credit Calculation Tool manual allows you to use either:
- The relevant commercial bank buying rate on the date the income is brought into Thailand
- The average buying rate announced by the Bank of Thailand
This matters when income is derived in one year but brought into Thailand later, because the baht value used for the Thai tax calculation may differ from its value when the income was originally derived.
If foreign tax has already been paid on the same income, separate rules apply when calculating any foreign tax credit.
See How Double Tax Agreements and Foreign Tax Credits Work in Thailand for the detailed rules.
How the Foreign-Income Rules Apply in Practice
The following examples show how the current rules can produce different outcomes depending on when the income was derived, your Thai tax residence in that year and what money was later brought into Thailand.
Example 1: Pre-2024 Savings Brought into Thailand Later
- Income derived: Before 1 January 2024
- Thai tax residence: Not relevant to the revised post-2024 treatment
- Remittance: Funds brought into Thailand later
- Result: The revised post-2024 remittance treatment does not apply
- Key evidence: Records showing when the underlying income was derived
Example 2: Bringing Income From a Non-Resident Year Into Thailand
- Income derived: Foreign employment income in 2024
- Thai tax residence: The individual was not Thai tax resident in 2024
- Later position: They moved to Thailand and became Thai tax resident in 2025
- Remittance: Some of the 2024 funds were later brought into Thailand
- Result: The current remittance rule does not apply to that 2024 income
The important year is 2024, when the income was derived. Becoming Thai tax resident in a later year does not change the treatment of income derived during a non-resident year.
Example 3: Bringing Income from a Resident Year into Thailand Later
- Income derived: Foreign pension income received in 2025
- Thai tax residence: The individual was Thai tax resident in 2025
- Remittance: Part of the 2025 pension income was brought into Thailand in 2026
- Result: The income is generally included in the Thai tax calculation under the current remittance rules
- Further considerations: The final result may still depend on the type of pension, any applicable Double Tax Agreement, exemptions and foreign tax credits
The key point is that the income can be brought into Thailand in a later year. The relevant residence test still looks at the year the income was derived.
Example 4: Bringing Money from a Mixed Overseas Account into Thailand
- Account contains: THB 1.5 million of pre-2024 savings, THB 300,000 of post-2024 pension income and THB 200,000 of dividends from a later resident year
- Remittance: THB 1 million is transferred to Thailand
- Problem: The Thai bank statement shows how much arrived but not which part of the overseas account was transferred
- Result: The account history and supporting records are needed to establish what the remittance represents
The key point is that money held in the same account can have different tax treatment. The amount transferred alone does not show which funds were brought into Thailand.
What Else Can Change the Tax Result?
Even where foreign income falls within the current remittance rules, that does not necessarily mean additional Thai tax will be payable.
Double Tax Agreements and Foreign Tax Credits
A Double Tax Agreement can affect which country has the right to tax particular income.
If the same income is properly taxed overseas and in Thailand, a foreign tax credit may reduce the Thai tax payable.
Thailand currently has DTAs with over 60 countries. Foreign tax credits are calculated separately by country and income type and are limited to the Thai tax attributable to the relevant foreign income.
See How Double Tax Agreements and Foreign Tax Credits Work in Thailand for the detailed rules.
Special Exemptions
Some taxpayers qualify for exemptions that change the normal foreign-income rules.
A key example is Thailand’s Long-Term Resident visa regime.
Under Royal Decree No. 743, qualifying holders in the following categories can qualify for a foreign-income exemption:
- Wealthy Global Citizen
- Wealthy Pensioner
- Work-from-Thailand Professional
The Highly Skilled Professional category has different tax treatment.
If you hold an LTR visa, check your specific category before applying the ordinary foreign-income rules.
Could the Foreign-Income Rules Change?
Yes. Thailand has considered more than one possible change to the taxation of foreign income.
One proposal would make the current remittance rules more favourable by exempting qualifying foreign income brought into Thailand in the year it is derived or the following year.
A separate proposal has considered moving Thailand towards a worldwide-income basis for Thai tax residents, under which overseas income could be taxable even if it is not brought into Thailand.
Neither proposal has replaced the current rules.
As of 7 September 2026, the existing Section 41 framework and Revenue Department Instructions Por.161/2566 and Por.162/2566 continue to apply.
Anyone making significant decisions about foreign income or remittances should therefore check the rules in force at the time rather than assume either proposed change will take effect.
Before Bringing Significant Foreign Funds into Thailand
Before transferring a substantial amount, work through these questions:
- What does the money represent?
- Is any part of it foreign-source assessable income?
- Which Thai tax year does that income relate to?
- Were you a Thai tax resident in that year?
- Was any of the income derived before 1 January 2024?
- Does the account contain money from several years or sources?
- How much represents income rather than existing capital?
- Who owns the funds?
- What records support the treatment?
- Which exchange rate should be used?
- Does an exemption apply?
- Does a DTA or foreign tax credit affect the result?
- Have the rules changed since you last reviewed the position?
Working through these questions before making a substantial transfer is usually much easier than trying to reconstruct the history of a mixed account afterwards.
Need Help Reviewing Foreign Income or a Remittance?
Foreign-income tax can be complex to work through, especially where different years, income sources or mixed accounts are involved.
We have helped thousands of expats understand their Thai tax position. Book a free support call to get the clarity you need.
