Thailand Tax on Foreign Income: The 2024 Rule Change Explained

The rule that allowed foreign income to be brought into Thailand tax-free as long as it was earned in a different year from the year it arrived is gone. It has been gone since 1 January 2024. Despite this, it continues to be described as a viable strategy in some expat communities and even some professional guides. This article sets the record straight, explains who is protected and who is not, and gives you the tools to assess your own position.

What Changed in 2024 The Old Rule vs The New Rule

The cross-year strategy now definitively obsolete

Until 2023, Thai tax law stated that foreign-source income was assessable for Thai personal income tax only if it was remitted to Thailand in the same tax year it was earned. This gave rise to a straightforward planning strategy: earn income in year 1, leave it in an overseas account, and transfer it to Thailand in year 2. Under the old interpretation, the year-2 transfer was not assessable because the income had been earned in year 1.

This was not an exploit or a loophole. It was the standard reading of the law by many qualified Thai tax advisers, and it was never challenged by the Revenue Department. It was widely practised by tens of thousands of foreign residents in Thailand.

Revenue Department Ruling Por 161/2566 what it says

In September 2023, the Thai Revenue Department issued Ruling Por 161/2566. The ruling stated, unambiguously, that foreign-source income remitted to Thailand by a Thai tax resident is assessable in the year of remittance, regardless of when the income was earned. This took effect on 1 January 2024.

The cross-year strategy stopped working on that date. Income earned in 2023 and remitted in 2024 is assessable in 2024. Income earned in 2024 and remitted in 2025 is assessable in 2025. The year of earning is irrelevant. Only the year of remittance counts.

What the ruling did NOT change

• Pre-2024 savings: Money accumulated in overseas accounts before 31 December 2023 can still be remitted to Thailand without triggering Thai PIT, even in 2025 or 2026. The ruling applies to income earned from 1 January 2024 onwards. Demonstrating that funds are pre-2024 savings requires clear documentation see the practical steps section below.
• The residency threshold: You must still spend 180 or more days in Thailand in a calendar year to be a Thai tax resident. The ruling only affects what tax residents owe on their foreign income it did not change who qualifies as a tax resident.
• Treaty-protected income: Income types covered by a double tax agreement between Thailand and your home country remain protected under the terms of that treaty.
• LTR visa exemptions: Royal Decree 743, enacted in 2023 alongside the LTR visa framework, specifically exempts qualifying LTR holders from Thai PIT on foreign-source income. The ruling does not override a Royal Decree.

What Types of Foreign Income Are Now Assessable

For a Thai tax resident who is not protected by a treaty or by Royal Decree 743, the following types of foreign income are assessable Thai PIT when remitted to Thailand from 2024 onwards:

The key trigger throughout is remittance the act of transferring money into Thailand or using overseas income to pay Thai expenses. Income that stays offshore is not currently assessed.

Pension Income UK, US, and Australian Retirees

Pension income is where the 2024 rule change has the most practical impact on foreign residents in Thailand. The position differs significantly by nationality and pension type.

US Social Security The Unresolved Question

This is the question that worries most American retirees in Thailand, and the honest answer is: the position is not settled.

The US-Thailand tax treaty does not contain a dedicated Social Security article. Several other US bilateral treaties for example, the US-Germany treaty explicitly address Social Security and provide protection from double taxation. The US-Thailand treaty does not. In the absence of explicit treaty language, US Social Security benefits received by a Thai tax resident and remitted to Thailand could be treated as assessable pension income under standard Thai domestic rules.

In practice, many US retirees in Thailand have continued to receive and remit Social Security without facing Thai tax assessment. This reflects enforcement practice and enforcement capacity not a legal exemption. The Revenue Department has not published specific guidance on how Social Security should be treated.

Foreign Investment Income: Dividends, Interest, and Capital Gains

Dividends from foreign-listed shares remitted to Thailand are assessable as Thai personal income. Interest earned on overseas savings accounts and transferred to Thailand is assessable. Capital gains from the sale of foreign assets shares, investment funds, property outside Thailand realised and remitted to Thailand are assessable as ordinary income at the progressive PIT rates (Thailand does not have a separate capital gains tax).

Treaty relief may be available for specific income types. For example, the UK-Thailand DTA contains provisions on dividends that may limit Thai tax on UK-source dividend income. Checking the specific treaty article applicable to your income type determines what relief, if any, is available. See the full double tax treaty guide.

Overseas Rental Income

Rental income earned from property outside Thailand and remitted to Thailand is assessable from 2024 onwards. The allowable deduction is 30% of gross rental receipts as a standard deduction (actual expenses cannot be claimed as an alternative). The net amount is added to your other assessable income and taxed at the progressive rates.

If your home country also taxes your overseas rental income, a double tax treaty may provide relief. Without a treaty, you may face taxation in both countries on the same income, though a foreign tax credit Thai tax paid offsetting your home country liability, or vice versa may be available under Thai domestic rules or your home country's rules.

Who Is Protected: The LTR Exemption and Tax Treaties

LTR Visa holders Royal Decree 743

Three of the four LTR visa categories receive a legally codified exemption from Thai PIT on foreign-source income under Royal Decree 743 (2023). This exemption was specifically designed to apply even as the 2024 foreign income rules took effect it was issued in the same policy context.

For retirees with significant overseas income who meet the Wealthy Pensioner threshold (USD 80,000/year or USD 40,000/year with a USD 250,000 Thai investment), the LTR visa is not just an immigration document it is a meaningful financial planning tool. The overseas income exemption can represent a substantial annual saving compared to the standard PIT liability on the same income.

Double tax treaties how they protect you

Thailand has comprehensive double tax agreements with more than 60 countries, including the UK, Australia, Germany, France, Singapore, and Japan. These treaties allocate taxing rights between the two countries for specific income types. Where a treaty gives exclusive taxing rights to your home country on a particular income type, Thailand cannot also tax that income.

Treaties are not automatic. To claim treaty protection in Thailand you typically need to file a Thai PIT return declaring the income, reference the specific treaty article, and obtain a Certificate of Residence from your home country's tax authority. The process requires professional assistance in most cases. See the full treaty guide, including specifics for US and UK readers.

Practical Steps to Assess Your Own Exposure

1. Determine your residency status. Count your days in Thailand for the relevant tax year (1 January to 31 December). If under 180 days, you are a non-resident foreign income is not assessable and you can stop here. If 180 days or more, continue.
2. List all foreign income received in the year. Employment income, pension distributions, investment returns, rental income, business profits. Separate income earned before 1 January 2024 (pre-ruling savings) from income earned from that date onwards.
3. Identify what was remitted to Thailand. Bank transfers to Thai accounts, foreign card spending on Thai expenses, overseas income used to pay Thai obligations directly. This is your potentially assessable pool.
4. Check your LTR visa category. If you hold an LTR WFT, WGC, or Wealthy Pensioner visa, Royal Decree 743 exempts your overseas income. Confirm which category you hold the HSP category does not have this exemption.
5. Check for treaty protection. Does your country have a DTA with Thailand? Does the relevant treaty article cover the income types you remitted? Check the specific article, not a general summary. The UK-Thailand DTA, for example, protects government pensions but not private pensions or the state pension.
6. Calculate your assessable income and estimate PIT. Apply the 30% deduction to rental income. Apply the standard personal allowance (60,000 THB) and employment deduction (50% capped at 100,000 THB) where relevant. Use the free tax calculator to estimate your liability under the progressive bands.
7. Get professional advice if your situation is complex. Multiple income types from multiple countries, US dual-filing obligations, large crypto positions, significant capital gains any of these makes professional advice worth the cost. The risk of under-reporting assessable income is a Thai tax offence regardless of whether it is detected.

Common Misconceptions Still Circulating in 2026

A few claims about Thailand's foreign income tax continue to circulate in expat forums despite being incorrect. Setting the record straight:

• "You can still bring in old savings tax-free." Correct but only for savings accumulated before 31 December 2023. Income earned from January 2024 onwards is not "old savings" no matter how long it sits in an overseas account before being transferred.
• "Thailand doesn't enforce foreign income rules on expats." Enforcement has been limited to date, but enforcement capacity is increasing, particularly through reporting obligations on Thai financial institutions and SEC-licensed exchanges. Absence of enforcement is not legal protection.
• "My LTR visa means I never pay any Thai tax." Incorrect. The overseas income exemption under RD 743 applies to foreign-source income for three LTR categories. Thai-source income, local investment returns, and income types outside the exemption are still assessable.
• "Using a foreign credit card in Thailand isn't remittance." Unresolved. This position is not confirmed by the Revenue Department and carries risk for significant amounts. Conservative treatment is to regard foreign card spending on Thai expenses as remittance.