Thai Tax Residency and the 180-Day Rule: What Foreigners Actually Owe

The 180-day test, precisely#

Section 41 of the Revenue Code defines a resident as any person present in Thailand for a period or periods aggregating 180 days or more in a tax year. The Thai tax year is the calendar year: 1 January to 31 December. Nothing else enters the test.

That last point does more work than people expect. There is no centre-of-vital-interests test, no permanent-home tiebreaker in domestic law, no requirement that you hold any particular visa, and no requirement that you have a Thai address, a Thai bank account or a work permit. A tourist on back-to-back visa exemptions who happens to accumulate 181 days is a Thai tax resident. An LTR holder who spends 179 days here is not. The days do not need to be consecutive, and partial days generally count — the practical measure is your entry and exit stamps.

The counter resets on 1 January. This is the single most useful fact for anyone planning around the rule: someone who arrives in September and leaves the following June has spent nine months in Thailand without ever becoming resident in either year.

What changed in 2024, and where it stands now#

Until the end of 2023, Thailand operated one of the most generous remittance regimes in Asia. Foreign income was taxable only if brought into Thailand in the same calendar year it was earned. Everyone with an offshore account simply waited until January, remitted last year's earnings, and paid nothing. This was not a loophole in the pejorative sense — it was the plain reading of Section 41, and the Revenue Department knew it.

In September and November 2023 the Revenue Department issued two Departmental Instructions, Paw 161/2566 and Paw 162/2566, that reinterpreted the section. From 1 January 2024, foreign-source income derived by a Thai tax resident is assessable in the year it is remitted into Thailand, whenever it was earned. The one-year wait no longer helps.

Paw 162 then added the crucial transitional rule: income earned before 1 January 2024 is not caught, no matter when it is brought in. Money that was already sitting in your accounts on 31 December 2023 can be remitted tax-free in 2026, 2030 or 2040. The practical consequence is that your most valuable tax asset is documentation — a dated statement establishing the balance of each offshore account on 31 December 2023, kept somewhere you will still find it in a decade.

One subtlety catches people out. Assessability attaches at the moment the income arises, if you were resident in that year. If you were a Thai tax resident in 2025 and earned foreign income then, that income remains assessable when you eventually remit it — even if you remit it in a year when you are not resident. Conversely, income earned in a year when you were not a Thai tax resident is generally outside the net entirely.

What counts as assessable foreign income#

Section 40 of the Revenue Code lists eight categories of assessable income. Applied to a typical foreign resident, the ones that bite are:

• Salary and employment income from a foreign employer, including remote work performed while sitting in Thailand.
• Professional and freelance fees, consultancy income and business profits from a foreign trade.
• Rental income from property abroad.
• Dividends and interest, including from foreign brokerage and bank accounts.
• Realised capital gains on foreign shares and funds. Thailand does not have a separate capital gains tax for individuals — gains are simply assessable income taxed at the ordinary rates.
• Pensions, though the treatment varies sharply by country and by pension type, and this is exactly where a double tax agreement usually decides the answer.

Three things are not assessable income and are routinely confused with it. A transfer of your own pre-2024 capital is not income. A genuine gift within the statutory gift allowances is not employment income, though the gift rules are narrower than the internet believes. And borrowed money — a drawdown on a foreign credit facility — is not income, which is why some advisers discuss loan-based structures. Treat any structure that depends on characterisation rather than substance with suspicion, and never adopt one without a written opinion.

Note also what the remittance rule does not cover: income from work physically performed in Thailand is Thai-source income and is taxable whether or not it is ever remitted, regardless of your residency status and regardless of where your employer or client sits. Remote workers frequently miss this distinction. See our guide to the DTV visa for how that interacts with the permission-to-work question.

The rates, deductions and allowances#

Those bands apply to net income, which is the number that matters. Employment income attracts a standard expense deduction of 50%, capped at ฿100,000. On top of that sit personal allowances: ฿60,000 for yourself, ฿60,000 for a non-earning spouse, ฿30,000 per child (a further ฿30,000 for a second or subsequent child born from 2018), ฿30,000 per dependent parent aged 60 or over, and deductions for life and health insurance premiums, provident fund and Social Security contributions, and mortgage interest.

The effect is that the first tranche of remitted income is often taxed far more lightly than the headline 35% suggests. A single person remitting ฿1,200,000 of foreign pension income, after allowances, typically lands well inside the 10–15% bands. That is a materially different conversation from the one usually had in expat Facebook groups.

Double tax agreements#

Thailand has double tax agreements in force with 61 countries, including the United Kingdom, the United States, Australia, Canada, Germany, France, Japan and Singapore. A DTA does two things. It allocates taxing rights over particular categories of income between the two states, and where both may tax, it provides a credit mechanism so the same income is not taxed twice over.

The allocation rules are where the real answers live, and they are not uniform. Government service pensions are usually taxable only in the paying state. Private and occupational pensions are frequently taxable only in the state of residence — which, if that is Thailand, means Thailand gets them. US Social Security is treated differently again, and US citizens remain subject to US federal filing on worldwide income regardless of where they live, so the DTA governs credits rather than exemption. Do not generalise from another nationality's outcome to your own.

Where a credit is available, it is a credit for foreign tax paid, not a blanket exemption, and the Revenue Department expects evidence: a foreign assessment or withholding certificate, translated if it is not in English. Claiming a credit you cannot document is the most common reason a straightforward filing turns into a query.

Getting a TIN and filing#

Who is exempt, and who thinks they are#

LTR visa holders have a genuine statutory exemption. Royal Decree No. 743 exempts foreign-source income remitted into Thailand by holders in the Wealthy Global Citizen, Wealthy Pensioner and Work-from-Thailand Professional categories. Highly-Skilled Professionals get something different — a flat 17% rate on Thai-source employment income, subject to BOI endorsement of the employer — and do not get the remittance exemption. This is the only broadly-available visa-linked tax benefit in the system.

DTV holders have no such exemption. The Destination Thailand Visa is a permission to stay, not a tax status, and a DTV holder who crosses 180 days is a tax resident on exactly the same terms as anyone else. The same is true of retirement extensions, marriage extensions and Thailand Privilege membership: none of them alters Section 41.

Diplomats, certain UN and international-organisation staff, and people covered by specific treaty provisions have narrow exemptions that are worth checking if they apply to you and irrelevant if they do not.

Common questions#