A VAT registration certificate (Por Por 20) — what should you know about using a foreign corporate document inside Thailand?

The matter being asked about is “A VAT registration certificate (Por Por 20)”, so it deals with the case-specific points first and the shared rules afterwards. When several certification layers are required, start with the slowest one. With a fixed filing date, count backwards from it and book each certification step in reverse. Record the reference number of each certification layer; it is the fastest way to trace status. High-resolution photos of seals and signatures help when the destination asks for re-verification. After certification, scan the full set before it leaves your hands. The specifics here are document type: Vat, and those decide which translation and certification level applies. The terms that frame this page are registration · certificate · know · using. What changes the timeline most here is whether the source documents are complete on day one. The point to fix before starting is the real deadline, so the steps can be scheduled backwards from it. Before starting, make sure document numbers, issue dates and issuing-office names match across the set, then keep a digital copy of every page, including seals and signatures, then plan the timeline so certification finishes before the real filing deadline. 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.

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