Do expats pay tax in Thailand? The residency & foreign-income guide.

First, are you a tax resident? The 180-day rule

Everything in Thai personal tax starts with one question: are you a tax resident? The test is purely about time in the country, not your visa or nationality.

• 180 days or more physically present in Thailand within a calendar year (1 January–31 December) makes you a tax resident for that year. The days are totalled across the whole year — they don’t need to be consecutive.
• Under 180 days and you’re a non-resident: generally taxed only on income from work or business physically carried out in Thailand, or from Thai sources such as a Thai property.
• The count is yours to prove. If you’re anywhere near the threshold, keep your own log of entries and exits — passport stamps and boarding passes — rather than relying on memory.

Why it matters: residency is the switch that brings your remitted foreign income into the Thai net, but it’s also what lets you claim personal allowances and treaty relief. Residency is a tax concept — it’s separate from your visa, your housing strategy, and the immigration paperwork like the TM30 and 90-day report.

What income Thailand can tax — source vs remittance

Two ideas decide what’s in scope: where the income arises (its source) and, for foreign income, whether you bring it in (remittance).

• Thai-source income is always in scope if you’re here to earn it — salary for work performed in Thailand, profit from a Thai business, and income from Thai assets such as a condo you let out. There’s no day-count escape for income that genuinely arises in Thailand.
• Foreign-source income — an overseas salary, pension, dividends, rent on a property abroad, investment gains — only enters the Thai net for a tax resident when it is remitted (brought) into Thailand.
• Money never brought in and kept entirely offshore is generally outside the Thai net — though your home country may still tax it, which is where treaties come in (section 4).

This source-vs-remittance split is exactly why expats plan around when and how they move money into Thailand — and why the 2024 change below matters so much.

The 2024 change everyone is asking about

This is the headline. For decades, foreign income escaped Thai tax unless you remitted it in the same year you earned it — so income parked abroad and brought in a later year fell through the gap.

• From 1 January 2024, the Revenue Department reinterpreted the rule: for a Thai tax resident, foreign-source income remitted into Thailand is assessable in the year it’s brought in, regardless of which year it was earned. The old “remit it next year and it’s free” timing trick no longer works.
• Earned and kept abroad (never remitted) is still generally outside scope — the change is about money you bring into Thailand, not a worldwide tax on everything you own offshore.
• Pre-2024 savings have been treated more leniently — broadly, funds you already held before the change are not meant to be caught simply for being moved in later. The detail matters, so document what you held and when.
• This is an evolving area still being clarified through guidance. Treat anything you read (here included) as orientation, and get current individual advice before remitting significant sums.

Practical takeaway: if you’re a 180-day resident planning to move a large amount into Thailand — say, to buy a condo under the foreign-currency remittance rule — understand the tax treatment before the transfer, not after.

Double-tax treaties — not paying twice

The fear most expats have — “will I be taxed in both countries?” — is usually softened by a double-tax agreement (DTA). Thailand has treaties with many countries.

• A treaty allocates taxing rights — deciding which country taxes a given type of income (employment, pensions, dividends, property), and how.
• Where both countries can tax, the treaty typically gives a credit for tax already paid abroad against the Thai liability on the same income — so you’re not paying the full amount twice.
• Relief is usually claimed, not automatic. You may still need to file in Thailand and show proof of the foreign tax paid to get the credit.
• The outcome depends on the specific treaty and income type — a US pension, a UK rental, and Australian dividends can all be treated differently.

Keep certificates of foreign tax paid and have a professional read the relevant treaty before assuming an exemption. Treaties reduce double taxation; they rarely make a filing obligation disappear entirely.

How the tax itself is structured

Thai personal income tax looks familiar to anyone from a Western system:

• It’s progressive — a tax-free band at the bottom, then rising rates on each higher slice of income, up to a top marginal rate of 35% on the highest earnings.
• You get personal allowances and deductions (for yourself, a spouse and children, and certain insurance and qualifying investments) that lower the taxable amount before the rates apply.
• Tax is on net assessable income after those allowances — not on your gross.

Because the exact bands, allowances and any treaty relief depend entirely on your numbers and change over time, treat any single percentage with caution. Work out your actual liability from the Revenue Department’s current schedule or with an accountant rather than a rule of thumb — and remember Thai personal tax is separate from the one-off taxes you pay at the Land Office when you buy.

Tax that touches your rent or property

Because BAANLYY is about housing, here’s where tax meets your home:

• Renting (as a tenant): you don’t pay income tax on rent you pay — but make sure the lease bills metered utilities at actual cost, a point covered in our tenant-rights guide.
• Letting a Thai condo (as a landlord): rental income is Thai-source and assessable here whether you’re resident or not. In some cases a percentage is withheld and credited to you, and you can deduct allowable expenses. Keep clean records of rent and costs.
• Buying: the big tax events happen on transfer day at the Land Office — transfer fee, plus either Specific Business Tax or stamp duty and a withholding tax. Those are walked through in the buying-process guide and estimated in the purchase-cost calculator.
• Bringing the money in: the foreign-currency you remit to buy (the FET) intersects with the 2024 remitted-income rules — plan the tax treatment before you transfer, not after.

For terms like FET, withholding tax, Specific Business Tax and Chanote, our property glossary defines them in plain English.

Getting a tax ID and filing

If you have assessable income in Thailand, you’re in the filing system:

• Get a Tax Identification Number (TIN) at a local Revenue Department office — or via your employer, who runs payroll withholding for you.
• Employees have tax withheld monthly and reconcile it on the annual return; people with foreign or rental income usually have to file actively.
• The annual personal return is filed after year-end — the paper deadline falls around the end of March, with a short extension for online filing through the Revenue Department’s e-filing system.
• Keep the paperwork: payslips, withholding certificates, proof of foreign tax paid, and records of what you remitted and when. File even when you expect a refund.

Deadlines and procedures change, so confirm current dates with the Revenue Department or your accountant. If your situation is anything beyond a simple salary, our tax & accounting directory explains how to choose an expat tax adviser — and what to ask before you hire one.

Mistakes that cost expats money or sleep

Frequently asked

Sources & References

• The Revenue Department, Thailand
• Bank of Thailand

Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.