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The Revenue Department issues a Thailand Tax Residency Certificate — often abbreviated TRC, and officially called a Certificate of Residence — to confirm that you were a Thai tax resident for one specific calendar year. You need it abroad when a bank, pension provider, broker or tax office asks you to prove Thai residency before it applies a double tax treaty. The Revenue Department issues it only for a year you have already completed: you must have spent 180 days or more in Thailand that year and filed a Thai tax return for it. From Phuket, you apply with form ร.อ.01 at Regional Revenue Office 11 in Surat Thani.
In short
- It's an English-language certificate from the Revenue Department, confirming your Thai tax residency for one stated year and one named treaty country.
- You qualify only if you spent 180 days or more in Thailand that year (Revenue Code section 41) and filed a Thai tax return for it.
- The certificate covers a completed year only — you cannot get one in advance.
- You apply with form ร.อ.01 and its residence attachment, RO.22, at your Regional Revenue Office; for Phuket that's Region 11 in Surat Thani.
- Ask your regional office about the fee, the processing time and whether online filing is available.
Why you need a tax residency certificate
A tax residency certificate matters the moment a foreign bank, pension provider, broker or tax authority asks you to prove, in writing, that you are a Thai tax resident before it will apply a double tax treaty. Thailand has such treaties with 59 countries, and the Revenue Department issues the certificate for one treaty country at a time — you name the country on the application, and the certificate speaks only to that relationship.
Whether you qualify at all turns on the 180-day rule: the certificate is available only for a calendar year in which you were a Thai tax resident. If your year was split between two countries, our case on a resident in two countries: splitting the income shows a typical way this gets worked out.
Who qualifies: 180 days and a tax return
Under section 41 of the Revenue Code, you are a Thai tax resident for a calendar year if you spend 180 days or more in Thailand during it. That is the test for residency itself — your nationality and visa type make no difference. Getting the certificate also requires a Thai return filed for that year, as the next paragraph explains.
The second condition comes from the Revenue Department's own practice rather than from the Revenue Code directly: every regional office's published document list for the certificate begins with a copy of your filed PND 90 or PND 91 return and the receipt for the tax paid. In effect, the certificate is available only for a year you have already filed for, and you apply after that year's return has been filed. We suggest checking both things before you request a certificate: how many days you actually spent in Thailand in the year in question, and whether that year's return has been filed. If you paid no tax for that year, the Revenue Department has not published how that case is handled. If you filed late, check with your regional office in advance how that affects the application. Our team raises both points with the regional office before advising you to apply.
Filing itself is covered in our guide to filing PND 90 or 91; it's worth getting that right first, since the certificate depends on it.
Documents: entry–exit record and return
| Document | Who asks for it | Note |
|---|---|---|
| Copy of your filed PND 90/91 (PND 95 at some offices) and the tax receipt | Every Regional Revenue Office | Confirms the year's return was filed |
| Form ร.อ.01 with the residence attachment RO.22 | Every Regional Revenue Office | Names the treaty country and the tax year |
| Entry–exit record from the Immigration Bureau's Immigration Technology Center | Some regional offices | Confirms the days you spent in Thailand; ask your own office if it's required |
| Evidence of worldwide income and of money brought into Thailand | Bangkok Region 1, since July 2026 | Not reported at other regions yet |
| Power of attorney, if someone applies on your behalf | Offices that accept a representative | Carries its own stamp duty |
Bringing money into Thailand is a separate question from the certificate itself; if you're also working out what counts as taxable remittance, see our guide to Thailand's foreign income tax.
Where to apply in Phuket and how long it takes
The certificate is issued by the Regional Revenue Office for your tax domicile — not by whichever branch happens to be closest. For Phuket residents, that is Regional Revenue Office 11 in Surat Thani, which the Phuket Area Revenue Office falls under. We suggest confirming the fee, the processing time and whether online filing is available directly with Region 11, rather than assuming it will be ready before a foreign deadline.
What depends on your office, and what the Revenue Department hasn't published
A few practical points are left to each office's own practice rather than settled by a published rule. It isn't clear whether Phuket residents can file through the Phuket Area Revenue Office itself or need to go to Surat Thani in person, or whether the application can be posted. The Revenue Department hasn't said whether a certificate is available for a year with no return filed or no tax due. How arrival and departure days are counted toward the 180-day test isn't published either, which matters if your total is close to the line. And if a foreign authority asks you to use its own residence form rather than the standard certificate, check with your Regional Revenue Office in advance whether it can sign that form.
Using it in the UK, US or Russia
United Kingdom. The UK–Thailand double tax convention has been in force since 20 November 1981. Confirm with your UK payer or with HMRC which document they will accept as proof of Thai residence before you apply.
United States. The US–Thailand treaty, in force since 15 December 1997, carries a saving clause: US citizens stay taxable in the US on their worldwide income regardless of Thai residency. A Thai certificate helps only where the treaty's own text grants relief — the saving clause overrides it for everything else, and the usual remedy for a US citizen is the US foreign tax credit, not the Thai certificate.
Russia. The Russia–Thailand treaty has been in force since 15 January 2009 and applies from 1 January 2010; Thailand is not among the states where Russia suspended treaty benefits in 2023. Where the treaty exempts or reduces Russian tax on a specific item of income, a Russian tax agent — a bank, broker or employer — may ask a non-resident for an official confirmation of residence issued by the foreign competent authority, together with a notarised Russian translation, before it refunds the amount of tax that was over-withheld at the non-resident rate (Tax Code of the Russian Federation, Article 232(6)-(7)). Russian tax residence is a separate, 183-day test over any 12 consecutive months (Article 207), so it's worth checking your Russian residency status alongside your Thai one.
What to do next
Before you apply for a certificate, we suggest checking two things: how many days you spent in Thailand in the year the certificate needs to cover, and whether that year's Thai return has been filed. Our team can review both, prepare a PND 90 or 91 filing if one is still outstanding, and put together the supporting documents your Regional Revenue Office is likely to ask for, in English and Thai. For a wider look at Thai tax rules for foreigners, start there if you're not yet sure what you owe.
Send us the certificate request you received and the tax year it covers, and we'll tell you whether your days and your filing are in order. We reply within 24 hours and agree the cost with you before we start any work. The Revenue Department makes the final decision on every certificate; we help you get the application right, not promise its outcome.
