Is Thailand's threshold 180 days or 183 days?

180 days. Thailand is one of the countries that does not use the more common 183-day figure, and the difference catches people out who assume the general rule applies. The days are counted within a calendar year, 1 January to 31 December, and they do not need to be consecutive.

Does Thailand tax my worldwide income?

Not currently. Thailand taxes residents on a remittance basis, meaning foreign income becomes assessable when it is brought into Thailand. Foreign income that stays outside Thailand is not subject to Thai personal income tax under the rules in force. This is a meaningful distinction from countries that tax residents on worldwide income whether or not it is remitted.

Is the same-year remittance exemption now law?

No. A proposal would exempt foreign income remitted in the year it is earned or the following year, and it has been widely reported as though it were settled. As of mid-2026 it had not been published in the Royal Gazette and so is not law. Until it is, the rule in force since January 2024 is the one that applies. Verify the current position before relying on it.

Do I have to file a Thai tax return if I am resident?

Residency and filing are separate questions. Whether you need to file depends on whether you have assessable income in Thailand, which for many foreign residents turns on what they remitted during the year. Because the answer depends on your own income mix, this is the point to speak to a Thai tax professional rather than rely on a general guide.

How do I know how many days I have spent in Thailand?

Stang counts your days per country automatically from where your expenses happen — no GPS and no manual check-ins. Because the record is a side effect of logging what you spend, it still exists in December, which is more than can be said for most spreadsheets. Stays is available on the Stang iPhone app.

Thailand tax residency, explained for foreigners

Thailand has become one of the most-discussed tax jurisdictions among people who live between countries, partly because the rules genuinely changed in 2024 and partly because a great deal of what circulates about them is out of date or was never right.

Here is the position as things actually stand.

When do you become a Thai tax resident?

You are a Thai tax resident if you are in Thailand for 180 days or more within a calendar year (1 January to 31 December).

Three details matter:

It is 180, not 183. Thailand does not use the more common figure, and people who assume the 183-day rule applies can be over the line while believing they are under it.
The days do not need to be consecutive. They are totalled across the year.
A part day generally counts as a full day, so arrival and departure days both count.

Residency is decided year by year. Being resident in 2025 does not make you resident in 2026.

What does being a Thai tax resident actually mean?

This is where most of the confusion sits. Thailand does not currently tax residents on worldwide income. It taxes on a remittance basis: foreign income becomes assessable when you bring it into Thailand.

Put plainly:

Foreign income you remit to Thailand — potentially taxable.
Foreign income you leave outside Thailand — not taxed under the current rules.

That distinction is the whole game, and it is why the 2024 change mattered so much.

What changed on 1 January 2024?

Before 2024, foreign income was only taxable if you remitted it in the same calendar year you earned it. Earn in one year, bring the money in the next, and it fell outside the Thai net entirely. That was a well-known and entirely legal piece of timing.

From 1 January 2024 that timing rule was removed. Foreign-sourced income remitted to Thailand by a Thai tax resident is assessable regardless of the year it was earned.

One important carve-out survives: income earned before 1 January 2024 is not caught by the new rule. Savings accumulated before that date can generally still be remitted without falling under it — which is precisely why being able to demonstrate when income was earned became suddenly valuable.

Is the same-year exemption law yet?

No — and this is the most commonly mis-stated point about Thai tax right now.

There is a proposal that would exempt foreign income remitted in the year it is earned or the immediately following year, which would restore something close to the pre-2024 position and is intended to encourage people to bring money in. It has been reported extensively, often in language suggesting it is already in force.

As of mid-2026 it had not been published in the Royal Gazette, which means it is not law. A Thai tax measure of this kind requires Cabinet approval, Council of State review, and Royal Gazette publication before it takes effect.

Until that happens, the rule that governs your remittances is the one in force since January 2024. If you are planning around the exemption, confirm its current status first — this is a live area and it may well have moved since this page was written.

What should you actually do about it?

Nothing here is a substitute for advice on your own situation, but the practical groundwork is consistent regardless of how the proposal lands:

Know your day count during the year, not after it. 180 days is a threshold you can still act on in September and cannot act on in January.
Know when income was earned, not just when it moved. The pre-2024 carve-out and any future year-based exemption both turn on dates you may need to evidence.
Keep the two questions separate. How many days you were present, and what you remitted, are different records answering different questions.

On the first, Stays in Stang derives your day count per country from your ordinary expense log — no GPS, no check-ins — so the number is available while the year is still running.

This is general information, not tax advice, and Thai rules in this area are moving. The position described here reflects the rules as understood in August 2026. Thai personal tax depends on your visa status, income sources, and any applicable double tax treaty, and LTR visa holders in particular are treated differently. Speak to a Thai tax professional before making decisions.