Do I Owe Thai Tax? A Plain-English Guide for Expats and Remote Workers

Checked as of 4 October 2026. Exchange rate: ฿33.5 = $1. Each rule below carries its source and date.

Since 1 January 2024, foreign income you bring into Thailand can be taxed here. The fix everyone quotes, the one that would make it tax-free if you bring it in within a year, still isn't law.

So start with one question. Are you in Thailand 180 days or more in a calendar year?

If not, Thailand taxes only your Thai-source income, and most of this guide doesn't apply to you. If yes, there's a second question: which money are you moving? Savings you already had, or income you've earned since 2024. Thailand cares which.

Most of what's online says either "Thailand taxes everything you bring in now" or "the exemption passed." Both are wrong. This guide sticks to what's written down, with dates, and flags what's unsettled.

The short version

Am I a Thai tax resident?

It's a day count. The Revenue Code (section 41, as quoted by KPMG) makes you resident if you're in Thailand "for a period or periods aggregating 180 days or more" in a tax year. The tax year is the calendar year.

Three things follow:

• Trips add up. The days don't need to be in a row. Four months in spring plus three in autumn makes you resident.
• The count resets on 1 January.
• Your visa doesn't change it. DTV, retirement, Thailand Privilege, tourist, visa-exempt: every day counts the same.

The LTR is the one exception, and even it doesn't change residency. Three of its four categories are simply exempt on foreign income they bring in. More below.

Two points are unsettled:

• "180 or more" vs "more than 180." The Revenue Department's own English page says "more than 180 days." That page was last updated in March 2024 and is out of date in other places too. The Code, per KPMG, PwC and Mazars, says 180 or more. Use 180 or more.
• How arrival and departure days count. I found no official English rule. Practitioners commonly count any part day in Thailand as a full day. That's practice, not law. If you're close to 180, don't plan around a day or two either way.

Non-residents pay Thai tax only on Thai-source income.

Not sure how much of the year you'll spend here? Start with which kind of expat you are.

What's taxable now

The 2024 change: Por. 161/2566

Before 2024, the Revenue Department taxed foreign income only if you brought it in the same year you earned it. Bring it in the next year: no Thai tax.

On 15 September 2023, the Revenue Department issued Departmental Instruction Por. 161/2566. From 1 January 2024, a resident's foreign income is taxable in the tax year it's brought into Thailand, whatever year it was earned. Salary, business income, rent, dividends, interest, gains: every category of assessable income is caught.

Since 2024, "I'll bring it in next year" stopped being a tax strategy.

What's grandfathered: Por. 162/2566

On 20 November 2023, Por. 162/2566 said the new rule doesn't apply to foreign income earned before 1 January 2024. Pre-2024 income and savings stay outside it, whenever you bring them in.

What else isn't income

• Savings from non-resident years. The Revenue Department's September 2023 Q&A, as summarised by Mazars, says money earned while you weren't resident can be brought in tax-free.
• Principal. Capital isn't income. For bonds, the Q&A says only the interest is taxable, not the principal. Gains, interest, dividends and wages earned since 2024 are income.

So your money sorts into buckets:

Your savings from before 2024 aren't the problem. Your paycheck from last month might be.

Unsettled: which year do you have to be resident?

Advisers read the rule as catching income that was earned on or after 1 January 2024, in a year you were resident, and brought into Thailand that year or later. KPMG ties the test to residency in the year the income was earned.

The other reading comes from the wording. Section 41 speaks of "a resident … in the tax year," which can point to the year you bring the money in. On that reading, you'd also have to be resident in the year of the transfer.

No ruling settles it, and advisers state the test differently. The safe working rule: if you were resident when you earned it, assume it's taxable when you bring it in. Don't count on a year spent mostly abroad as a window to move money in tax-free.

Remote work done here: a grey area

You sit in Bangkok and work for a US company. Is that foreign income? Not necessarily. Section 41's first paragraph, as advisers quote it, taxes income from work performed in Thailand "whether paid in or outside Thailand." On that reading, it's Thai-source income, taxable whether or not you bring it in. No Revenue Department ruling addresses remote workers. Advisers disagree. I'll stop there. (The visa side of remote work is in the DTV guide.)

The proposed fix: where it actually stands

What's proposed: foreign income brought in during the calendar year it's earned, or the year after, would be exempt. Income brought in later would stay taxable at 5–35%. It's expected to take the form of a ministerial regulation or Royal Decree.

Where it stands, as of 4 October 2026:

• Drafted by the Revenue Department in 2025.
• Not approved by Cabinet.
• Still needs Council of State review and publication in the Royal Gazette.
• Not in the Royal Gazette as of 27 September 2026 (ThaiLawOnline's tracker). A search on 4 October 2026 found no Cabinet resolution or Ministry of Finance announcement adopting it.
• Practitioners say it stalled when Parliament was dissolved before the February 2026 election.

What isn't known: whether it would cover income from 2024 and 2025, exactly what "the following year" means, or what conditions come with it. No final text exists. I won't guess when, or whether, it passes.

For money you move in 2026, Por. 161/2566 applies, unchanged. Plan for the law you have.

Rates and allowances

Thailand taxes net income on a progressive scale. Rates for tax year 2026, per PwC (reviewed 24 August 2026):

The allowances most expats will meet (PwC, 2026):

• Personal allowance: ฿60,000. A spouse with no income adds ฿60,000. Each child, ฿30,000.
• Employment income: a 50% expense deduction, capped at ฿100,000.
• Age 65 and over: up to ฿190,000 of assessable income is exempt, claimed on the PND 90/91 (Revenue Department PND 90 guide). Advisers say it applies to assessable income generally, which would include foreign pension income you bring in. No Revenue Department ruling confirms that.

There's no general retiree break. A retirement visa carries no tax concession. A retiree who stays 180 days or more is resident like anyone else, and pension income earned since 2024 and brought in is assessable unless a treaty assigns it to another country. Pre-2024 savings aren't caught. Retiring in Thailand: the visa options

One warning. The Revenue Department's English income-tax page still shows a ฿30,000 personal allowance and a 35% rate starting above ฿4 million. Those figures are years out of date. Don't use them.

Americans: you file in both countries

The US–Thailand tax treaty, signed in Bangkok on 26 November 1996, doesn't get Americans out of US tax. Article 1(2), the saving clause, lets each country tax its own citizens "as if the Convention had not come into effect."

So the US taxes your worldwide income, wherever you live, and Thailand taxes what its residency and remittance rules catch.

• Relief comes through foreign tax credits (Article 25, which the saving clause leaves intact, plus each country's own law). The Revenue Department's Q&A confirms treaty credits can be used against Thai tax.

The treaty decides who gets credit, not who gets skipped.

US Social Security is the clean answer. Article 20(2) says social security benefits paid by one country to a resident of the other "or a citizen of the United States shall be taxable only in the first-mentioned State." So US Social Security paid to a Thai resident is taxed only by the US. That article is on the saving clause's exception list, so it holds.

Private pensions are less clean. Article 20(1) assigns them to the country where you live. But it isn't on the exception list, so the US can still tax its citizens on them. 401(k)s and IRAs are adviser territory.

One question worth asking: if you use the Foreign Earned Income Exclusion ($130,000 for 2025, $132,900 for 2026), there may be no US tax on that income to credit against Thai tax. That's an inference, not a verified rule. Ask.

Which country credits which tax depends on the type of income and its source. Hand that part to a cross-border adviser who prepares both US and Thai returns. Not American? Thailand's treaties differ. Read yours.

For the wider money picture, see earn in dollars, live in baht.

LTR holders

The LTR is the only visa with a tax break, and not every holder gets the same one. Royal Decree 743 (2022) and Revenue Department Notification 427 set it out; the Revenue Department's February 2026 presentation lists the same three exempt categories.

Three limits on the exemption:

• It covers foreign income only. Thai-source income is taxed normally.
• It lapses in any year you stop meeting the LTR conditions.
• The decree's English text speaks of income "derived in the previous tax year … and brought into Thailand." The Revenue Department's 2026 presentation states the exemption without that qualifier. How it applies to your income is a question for an adviser.

The 17% rate is Highly-Skilled Professionals only, and only on qualifying employment income in Thailand. Not all income. Not all LTR holders. The full category rules are in the LTR guide.

Practical steps

1. Get a tax ID

Register in person at the Area Revenue Office for your registered address, on form L.P. 10.1, with your passport, visa and proof of address. It's free. Practitioner guides say there's no online application for foreigners, and advisers say the law requires registration within 60 days of first having assessable income. Neither point is checked against the Code.

2. File on time

• PND 90: mixed income, including foreign, business and investment income. Most people with foreign income file this one.
• PND 91: employment income only.
• Deadline: 31 March of the following year on paper. E-filing usually gets about a week more (PwC gives 8 April), but that extension is renewed by time-limited notices. Check rd.go.th for the current year.

3. Keep the buckets separate

The Revenue Department hasn't published rules on how to prove money is savings and not income (Mazars), or how mixed accounts are treated. What advisers recommend:

• Keep pre-2024 savings and post-2024 income in separate foreign accounts.
• Keep your year-end 2023 statements.
• Bring money in from the savings account, and keep the paper trail.

Keep two buckets: money you had before 2024, and money you earned after. Thailand cares which one you spend.

4. Know what late costs

Late payment carries a 1.5% surcharge a month, part months included, capped at the tax due (Revenue Code section 27). Fines are separate. Guides quoting a "200% penalty" or compounding interest contradict the Code's text.

5. Know what's visible

• Thai banks have collected a tax-residency self-certification when you open an account since 1 January 2023, under the Common Reporting Standard (CRS). Thailand also receives CRS data from partner countries. Opening a Thai bank account
• Money moved to meet a visa's financial test (฿800,000 for a retirement visa, ฿500,000 for the DTV) is visa evidence, not a tax event. Immigration doesn't assess tax. But it's still money brought into Thailand, and whether it's taxable depends on which bucket it came from.
• Enforcement is anecdotal. Advisers describe light enforcement in the first filing cycles and more focus in 2026. That's commentary, not data. I found no Revenue Department statistics on expat audits.

Common mistakes

1. Treating the same-year/next-year exemption as law. It's a draft.
2. Thinking your visa sets your tax status. The day count does.
3. Treating every transfer as taxable, or none. It depends on the bucket.
4. Assuming a US return covers Thailand, or the reverse.
5. Mixing savings and new income with no records.
6. Assuming every LTR holder pays 17%, or that Highly-Skilled Professionals get the exemption.
7. Assuming remote work done here is foreign income. Advisers disagree.
8. Counting on a year abroad to bring money in tax-free. Unsettled.

Before you go

This is information, not tax advice: get a cross-border tax adviser who handles both countries, and know these rules were checked as of October 2026.