A corporate power of attorney — what should you know about using a foreign corporate document inside Thailand?

The scope of this answer is “A corporate power of attorney”, so it covers both the requirements attached to this document set and the order the steps must follow. Keep a copy of every source document plus the receipt or docket from each step. High-resolution photos of seals and signatures help when the destination asks for re-verification. When several certification layers are required, start with the slowest one. Plan the schedule with room for at least one review cycle at the receiving office. If any requirement is still unclear, send a sample image to the receiving body before producing the full set. The terms that frame this page are corporate · power · attorney · know. The specifics here are document type: Poa, and those decide which translation and certification level applies. 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. A key variable is the filing channel (in person, agent or online), which sets the copy format to prepare. The condition most often overlooked is that name spelling must match across every document in the set. A corporate document issued abroad for use with a Thai authority — a parent-company certificate or a shareholders' resolution, for example — is normally legalised in the country of origin and by the Royal Thai Embassy there, then translated into Thai and certified by the Department of Consular Affairs before it is filed with the DBD or the relevant agency. Thailand deposited its instrument of accession to the Hague Apostille Convention on 30 June 2026, but the Convention is not yet in force for Thailand, so consular legalisation through the Ministry of Foreign Affairs and the relevant embassy remains the working route; confirm the current requirement with the destination before filing. Foreign participation in business in Thailand falls under the Foreign Business Act B.E. 2542, which sets out restricted business lists, while investment promotion is administered by the Board of Investment under the Investment Promotion Act B.E. 2520 as amended; the document set to be translated differs according to the route used. ILC handles document work only — translation, certification of the translation, notarial signature certification and the legalisation run at the Ministry of Foreign Affairs and embassies. ILC is not a registrar, auditor or tax adviser and cannot guarantee the decision of any authority or counterparty. Cost and lead time depend on page count, the language pair and the certification steps the destination requires, so every file is quoted before work starts. Send a scan of the documents together with the receiving authority's or counterparty's own instructions via LINE @NAATI, call +66 80-557-8887 or email ilc@thainotary.co.th.

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