Thai Tax Residency and Foreign Income: The 180-Day Rule

Published 1 October 2026 · By the Visit-Thailand editorial team · Editor: Terje Moy

You become a Thai tax resident if you spend 180 days or more in Thailand in a calendar year. Since 1 January 2024, a resident who brings foreign income into Thailand must normally include it in that year's Thai tax return, if the income was earned in 2024 or later in a year when they were resident (law in force in October 2026).

This change, made by two Revenue Department instructions in 2023, matters to remote workers, DTV holders and retirees who move pensions or investment income into Thailand. Before 2024, foreign income brought in during a later year than it was earned was in practice not taxed. That practice has been cancelled.

This page explains what the Revenue Department's own documents say, with its own examples. It is not tax advice. Tax treaties, pension rules and your home country's tax law all affect the result, so check your own case with a qualified tax adviser before you move money.

The 180-day test, with the Revenue Department's examples

The Revenue Code defines a resident as a person who is in Thailand for 180 days or more in total during the calendar year, whether in one continuous stay or several shorter ones. Nationality makes no difference. The Revenue Department's question-and-answer document gives examples that settle the most common doubts:

• Someone in Thailand every day of 2024 (366 days) is resident for 2024.
• Someone in Thailand for parts of 2024 adding up to 184 days is resident.
• Someone in Thailand for 179 days in total is not resident.
• Someone who stays 250 days in a row, with 100 days falling in 2024 and 150 in 2025, is resident in neither year, because each calendar year is counted separately.

That last example is useful for planning. The test resets on 1 January, so where your days fall matters as much as how many there are. Keep your own record of entry and exit dates, for example from the stamps in your passport.

The visa you hold does not change the test. A DTV holder who uses a 180-day entry plus an extension will usually pass 180 days in a year, and so will most people on a retirement extension. Visitors on the 30-day visa exemption rarely get close.

What changed in 2024: Instructions Por. 161 and Por. 162

Section 41 of the Revenue Code has long said that a Thai resident with income from work, business or assets abroad must pay tax when that income is brought into Thailand. For years, the Revenue Department applied this only to income brought in during the same year it was earned. Money earned in one year and transferred the next was, in practice, outside Thai tax.

Departmental Instruction Por. 161/2566, signed on 15 September 2023, ended that. It says a resident who brings foreign income into Thailand in any tax year must include it in that year's personal income tax, for income brought in from 1 January 2024. It cancels all earlier rulings and practices that conflict with it.

A second instruction, Por. 162/2566, signed on 20 November 2023, added a protection: the new rule does not apply to income that arose before 1 January 2024. Savings built from income earned up to the end of 2023 can therefore be brought in without being caught by Por. 161.

The two conditions that must both be met

The Revenue Department's Q&A sums up the rule as two conditions. You owe Thai tax on foreign income only if:

1. the income arose on or after 1 January 2024, in a tax year in which you were in Thailand for 180 days or more; and
2. you bring that income into Thailand, in the same year or any later year.

If both apply, the income is added to your taxable income for the year in which you bring it in. The Department's own example: a person in Thailand for 200 days in 2024 earns rent from a property abroad that year, and transfers the rent to a Thai bank account in 2025. The rent is taxable in Thailand in 2025.

The reverse is just as important. The Q&A states that someone who was not resident in the year the income arose does not pay Thai tax on it, even if they bring it in later. Its example is a Thai national who lived and worked in China from 2007 and moved home in 2024 with the savings: those savings came from years when she was not resident, so they are not taxed.

What counts as "bringing income into Thailand"

The Revenue Department defines it broadly: bringing income in "by any method", giving as examples a bank transfer, an online transfer, or carrying the money into the country yourself. Its example is a resident who sends 200,000 baht to a foreign bank, earns 10,000 baht interest, and then transfers the interest to a Thai account. The interest has been brought in and is taxable.

Several details in the Q&A help with planning:

• Capital is not income. Money you sent abroad and bring back is not taxed again; only the gain, interest or new income is.
• You assess the split yourself. When an amount mixes capital and profit, the taxpayer decides from the facts which part is income, so keep records that show where each transfer came from.
• Unrealized gains are not taxed. A rise in the value of foreign shares you have not sold is not income. A gain becomes income when you sell.
• The exchange rate is the rate on the day the money is brought in.

The Q&A does not spell out how spending with a foreign card or withdrawing cash from a foreign account at a Thai ATM is treated. Given the "any method" wording, ask your adviser before you assume these fall outside the rule. Our older articles on using ATMs in Thailand and exchanging money cover the practical side of moving cash.

Double taxation and the foreign tax credit

Income that has already been taxed abroad can still be taxable in Thailand when brought in, but the Revenue Department says this does not have to mean double taxation. A Thai tax resident can use tax paid abroad as a credit against Thai tax where a double taxation agreement allows it. In November 2025 the Department published a Thai-language guide to an online tool that helps individuals calculate this foreign tax credit.

Thailand has many tax treaties, and their terms differ, particularly for pensions and government service income. The UK government, for example, notes that the UK has a double taxation agreement with Thailand and tells British residents to contact the Thai Revenue Department about relief. Read the treaty between Thailand and your country, or ask an adviser who knows both systems.

What nomads, DTV holders and retirees should check

Remote workers and freelancers. If you live on income earned abroad and spend 180 days a year in Thailand, money you transfer in for living costs may be taxable. Consider how many days you spend in Thailand each calendar year, which accounts your transfers come from, and whether your home country still taxes you. Our older article on working as a digital nomad in Thailand covers the lifestyle; this is the part it does not.

Retirees. The retirement visa requires you to bring money into a Thai bank. Pensions are income; savings from before 2024, or from years you were not resident, are treated differently. Keep separate accounts and records if you can, so you can show which money you are transferring.

LTR visa holders. The Board of Investment lists "tax exemption for overseas income" as an LTR privilege, which is a real difference from the DTV and retirement visas. See our guide to the Long-Term Resident visa.

A Thai bank account is part of everyday life for most long-stay residents; our guide to opening a bank account in Thailand covers what banks ask for.

To add up your days per calendar year, use our tax residency day counter.

Frequently asked questions

How many days in Thailand make me a tax resident?

180 days or more in one calendar year, from 1 January to 31 December. Days from separate stays are added together. The count restarts each year, so a long stay that spans New Year may leave you below 180 days in both years.

Is foreign income earned before 2024 taxed when I bring it to Thailand?

No. Revenue Department Instruction Por. 162/2566 says the new rule does not apply to income that arose before 1 January 2024. Income from years when you were not a Thai tax resident is also not taxed when brought in, according to the Department's Q&A.

Does Thailand tax my worldwide income?

Not in the sense many headlines suggest. Under the rule in force in October 2026, a resident is taxed on foreign income only when it is brought into Thailand, and only if it arose in 2024 or later in a year of residence. Income kept abroad is not caught by this rule.

Do DTV holders pay Thai tax on foreign income?

The DTV has no published tax exemption, so the normal rule applies. A DTV holder who spends 180 days or more in Thailand in a year, and brings in foreign income earned while resident, should expect it to be taxable. A tax adviser can confirm how your treaty applies.

Has Thailand changed the remittance rule again?

Proposals to exempt income brought in during the year it is earned or the following year have been reported, but as of October 2026 none has been put into force. Instruction Por. 161/2566 still applies. Check the Revenue Department's site for any newer instruction.

Sources

• Revenue Department – Departmental Instruction Por. 161/2566 (Thai, signed 15 September 2023) (checked October 2026)
• Revenue Department – Departmental Instruction Por. 162/2566 (Thai, signed 20 November 2023) (checked October 2026)
• Revenue Department, Legal Affairs Division – Questions and answers on section 41 paragraph 2 (Thai) (checked October 2026)
• Revenue Department – English home page (checked October 2026)
• UK Foreign, Commonwealth & Development Office – Living in Thailand (tax section) (checked October 2026)
• Board of Investment – LTR visa privileges (checked October 2026)