Opening a branch or subsidiary abroad living in Chiang Mai — where do you start?

This question is specifically about “Opening a branch or subsidiary abroad living in Chiang Mai”, so it deals with the case-specific points first and the shared rules afterwards. Check first whether the issuing office of the source document is one the destination recognises. The deciding factor is the receiving body's requirement, not only the format of the Thai-side document. Before starting, count the number of certified sets needed before work starts, because extra sets restart the certification steps, then verify the source document is still within any validity window the recipient applies, then check that names are spelled identically to the passport or ID card on every page. The specifics here are location: Chiangmai, and those decide which translation and certification level applies. The terms that frame this page are Opening · branch · subsidiary · abroad. The next step is confirming the filing channel and the copy or file format required. Public holidays and embassy closures move certification queues more than most people expect. With a fixed filing date, count backwards from it and book each certification step in reverse. Keep a copy of every source document plus the receipt or docket from each step. Record the reference number of each certification layer; it is the fastest way to trace status. Tax in Thailand is governed by the Revenue Code and administered by the Revenue Department under the Ministry of Finance, which is also the body that issues official tax evidence. Documents you rely on abroad should therefore be issued or certified by the Revenue Department rather than self-prepared, because receiving tax authorities check for the seal or signature of an authorised officer. Thai tax and accounting documents used abroad are normally translated in full — including seals and signatures — then the translation is certified by the Legalisation Division, Department of Consular Affairs, Ministry of Foreign Affairs, and finally legalised at the destination embassy or consulate where that country requires it. Thailand is not a party to the 1961 Apostille Convention, so no apostille is issued on Thai documents. ILC handles the document side: translation, certification of the translation, coordination of legalisation and booking a notarial-services attorney. ILC is not an auditor, not a tax agent and does not give tax advice; liability calculations, planning and return filing belong with a licensed CPA or tax adviser, and any assessment remains at the authority's discretion. Cost and lead time depend on page count, target language, how many certified sets are required and the steps the receiving authority sets, so every file is quoted before work starts. Send scans of every page together with the letter or form the tax authority sent you, via LINE @NAATI, call +66 80-557-8887 or email ilc@thainotary.co.th.

ปรึกษาฟรี — LINE @NAATI · โทร 080-5578887 · อีเมล ilc@thainotary.co.th