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Thai Tax Residence & DTA Relief for Expatriates
180-day rule, 2024 remittance changes, DTA credits with 60+ countries, and Certificate of Residence filings.
Quick Answer
Thai tax residence = 180+ days per calendar year. From 2024, remitted foreign income is taxable (Por.161/2566), but DTAs give foreign-tax credits with 60+ jurisdictions. Planning + filing from THB 15,000.
FAQ
- When am I a Thai tax resident?
- You are a Thai tax resident if you are physically present in Thailand for 180 days or more in a calendar year (Revenue Code Sec. 41). Residents are taxed on Thai-source income and, from 2024 onward, foreign-source income remitted to Thailand.
- How do DTAs (Double Tax Agreements) help?
- Thailand has DTAs with 60+ countries (US, UK, Australia, Japan, Germany, Singapore, etc.). DTAs prevent double taxation via foreign tax credits, tie-breaker rules for dual residents, and reduced withholding rates on dividends/interest/royalties. We prepare Certificates of Residence (COR) and tax-credit claims.
- What changed in 2024 for remitted foreign income?
- Revenue Department Order Por.161/2566 (effective 1 Jan 2024) taxes foreign-source income of Thai tax residents when remitted to Thailand in the same or subsequent year — reversing the old "remit next year to avoid tax" rule. Planning: pre-2024 savings remitted are exempt; DTA credits still apply.
- Rates?
- Tax residence analysis + planning memo THB 15,000–35,000. Certificate of Residence (COR) filing THB 8,000. Full DTA relief filing with foreign tax credit claim THB 25,000–75,000. Annual expatriate tax return (PND.90/91) THB 12,000–40,000.
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How Thai tax residence is determined
An individual is a Thai tax resident for a calendar year if present in Thailand for 180 days or more in that year. The days do not need to be consecutive and there is no intent test: the count governs. Residence status is decided year by year, so a person can be resident in one year and non-resident in the next while living the same way.
Residence matters because it changes what Thailand taxes. A non-resident is taxed on Thai-sourced income only. A resident is taxed on Thai-sourced income and, in addition, on foreign-sourced income that is brought into Thailand. Departmental Instruction Por 161/2566, effective for income from 1 January 2024, removed the long-standing practice under which foreign income remitted in a later calendar year escaped tax. Foreign income earned while resident is now assessable when remitted, whichever year that occurs.
What a treaty can and cannot do
| Question | Domestic law answer | What a DTA can change |
|---|---|---|
| Am I resident? | 180-day count | Tie-breaker rules allocate residence where both states claim it |
| Is my salary taxable here? | Taxable if the work is performed in Thailand | Short-stay exemption where the day, employer and permanent-establishment tests are all met |
| Is my foreign pension taxable? | Assessable if remitted while resident | Many treaties allocate government-service pensions to the paying state only |
| Is my dividend taxed twice? | Thai tax on the remittance | Reduced withholding at source plus foreign tax credit relief in Thailand |
| Is my rental income abroad taxable? | Assessable on remittance | Immovable property income is usually taxable where the property sits, with credit relief |
Building a claim that survives review
- Fix the residence position: Reconstruct the day count from entry and exit stamps and boarding passes for each calendar year in scope.
- Characterise each income stream: Employment, pension, dividend, interest, royalty and property income sit in different treaty articles with different outcomes.
- Trace the remittance: Identify which funds entered Thailand and what they represent. Capital held before 2024 and pre-existing savings are a different case from current-year income.
- Obtain the foreign certificate: A residence certificate from the other state, or proof of tax paid, is what supports credit relief at filing.
- File on the correct form: PND 90 or 91 by the statutory deadline, with the credit claim and supporting schedules attached rather than left for an enquiry.
The Thai certificate of residence for treaty use
Where the other state is the one applying the treaty, it will usually require a Thai certificate of residence issued by the Revenue Department, sometimes with a separate certificate of tax payment. The Department issues these on application supported by evidence of presence and, where relevant, of Thai tax paid. Foreign payers frequently insist on the certificate before applying a reduced withholding rate, so the certificate should be requested before the payment date, not after the tax has already been withheld at the full rate.
Common mistakes and how we avoid them
More questions we are asked
- Does 180 days mean a rolling twelve months?
- No. It is the calendar year, 1 January to 31 December.
- Is money I saved before 2024 taxed when I bring it in?
- Income earned before 2024, and capital that is not income at all, is treated differently from post-2024 foreign income. The difficulty is evidential, which is why account segregation matters.
- Do I need to file if all my income is abroad and nothing is remitted?
- A resident with no assessable Thai income and no remittance may have no liability, but filing positions differ by fact pattern and a nil return is often the safer record.
- Can a treaty stop Thailand taxing my remittance entirely?
- Sometimes, for specific categories such as certain government pensions. More often it reduces double taxation through credit relief rather than removing the charge.
- How long does a residence certificate take?
- Plan several weeks from a complete application, longer if presence evidence has to be assembled from passport stamps.
Frequently asked questions
- Can a foreigner own 100% of a Thai company?
- Generally no for activities listed in the Foreign Business Act, where majority foreign ownership requires a Foreign Business Licence, a BOI promotion, or treaty rights such as the US–Thailand Treaty of Amity. Manufacturing and certain export activities are largely open, and BOI-promoted activities can permit full foreign ownership together with land-holding and visa privileges, so the right structure depends on the specific activity.
- What is the minimum registered capital for a Thai company?
- There is no general statutory minimum for a Thai-majority company, but practical thresholds apply: THB 2 million of paid-up registered capital per foreign work permit, or THB 1 million if the foreigner is married to a Thai national, and THB 3 million per foreign shareholder for a Foreign Business Licence. Capital should therefore be planned around the visa and work-permit outcome you need, not the incorporation minimum.
- How long does company registration take?
- Registration at the Department of Business Development can be completed within one to three working days once the name reservation, shareholder documents and company objectives are ready, and the VAT registration and social security registration follow afterwards. The realistic end-to-end timeline including bank account opening is two to six weeks, with the bank account usually being the slowest step for foreign directors.
- What ongoing accounting obligations does a Thai company have?
- Every Thai company must keep statutory accounts, file monthly withholding tax (PND 1, 3, 53) and VAT (PP 30) returns by the middle of the following month, file the half-year corporate income tax return (PND 51) and the annual return (PND 50), and have its financial statements audited by a Thai CPA and filed with the DBD each year. Dormant companies are not exempt — nil returns and an audited statement are still required.