What is the registration process for setting up a branch office or representative office for a multinational company in Thailand — Concierge work runs alongside the core official steps, and each item has its own authority of record — the Department of Land Transport, Immigration Bureau, Customs Department, Department of Livestock Development, Revenue Department, Office of Insurance Commission, Ministry of Education, the professional councils and the Board of Trade — whose requirements we follow exactly. /land|title deed/i /tax identification number|TIN/i The TM.30 address notification is the duty of the house-master or accommodation provider, not of the guest. A foreigner present in Thailand for 180 days or more in a tax year is a Thai tax resident under the Revenue Code. Where a visa class requires health insurance, the minimum sum insured is the figure published by the issuing authority at the time of filing. The receiving body may ask for extra proof of relationship, such as a birth certificate or house registration, where surnames differ. Court interpreters must be sworn before the court under the procedural codes prior to acting. Claiming an estate abroad usually requires a legalised and translated court order appointing the estate administrator. Every file has a named case handler, a status-tracking channel, and a closing summary returned with your originals.
“What is the registration process for setting up a branch office or representative office for a multinational company in Thailand?” falls within an end-to-end service that combines document preparation, translation, signature certification, consular legalisation and coordination with the destination mission into a single file. The people who search for it are usually preparing a filing against a fixed deadline, recovering from a rejected submission and trying to identify the missed step, or coordinating documents for several people at once.
In practice, each step sits with a different body: the issuing office, the Notarial Services Attorney, the Department of Consular Affairs, and the destination country’s diplomatic mission. Knowing which body owns which step makes it possible to judge how many stages a bundle needs, and which of them cannot be corrected without starting again.
This is a baseline set. Individual receiving authorities may add requirements, so confirm with the destination body first.
Record how many stages each document needs, who certifies it, and what must finish first, so no step has to be redone.
Check personal names, company names, addresses and dates across the whole bundle before any certification begins.
Original → translation → signature certification / legalisation → destination mission. Doing these out of order forces a restart.
Verify the number of sets, the seals, the binding, and that issue dates are still within the destination’s validity window.
| Route | When it applies |
|---|---|
| Notarial Services Attorney certification | For privately drafted instruments — powers of attorney, affidavits, consent letters — signed in the attorney’s presence. |
| Legalisation at the Department of Consular Affairs | Where a foreign authority needs confirmation of the Thai issuing office’s signature and seal, or of the translation. |
| Attestation at the destination mission | Where the destination country requires its embassy or consulate in Thailand to attest the file after consular legalisation. |
| Thailand’s Apostille status | Thailand acceded to the Apostille Convention on 30 June 2026 and it enters into force for Thailand on 28 February 2027. No Apostille is issued in Thailand before that date. |
If you are working through “What is the registration process for setting up a branch office or representative office for a multinational company in Thailand?”, start by getting the receiving authority’s requirement in writing, then plan the certification chain backwards from your real filing date.