An investor from South Korea certifying under the Thai-US Treaty of Amity — how should the supporting documents be translated and certified?

The scope of this answer is “An investor from South Korea certifying under the Thai-US Treaty of Amity”, so it separates what is specific to this file from the standard certification chain. The terms that frame this page are investor · South · Korea · certifying. The specifics here are destination: Kr, and those decide which translation and certification level applies. Before starting, ask in advance which category of certified translator the destination accepts, then plan the timeline so certification finishes before the real filing deadline, then keep a digital copy of every page, including seals and signatures. A key variable is the filing channel (in person, agent or online), which sets the copy format to prepare. The point to fix before starting is the real deadline, so the steps can be scheduled backwards from it. Attach a document index to the bundle so nothing is lost during review. If the receiving body confirmed its requirements by email, keep that message with the file. Documents with a short validity window should be produced as close to the filing date as possible. Public holidays and embassy closures move certification queues more than most people expect. After certification, scan the full set before it leaves your hands. Foreign documents used in a work permit or incorporation file — degrees, experience letters, the parent company's certificate of incorporation, powers of attorney and passports — must be translated into Thai or English as the office requires and certified along the correct chain: certification in the country of origin, then embassy or Department of Consular Affairs legalisation as applicable. Business activity by foreigners is restricted by the Foreign Business Act B.E. 2542 (1999), which sorts activities into Lists 1, 2 and 3; a Foreign Business Licence or Foreign Business Certificate from the DBD is required where the Act applies, while US nationals may instead certify under the Treaty of Amity. Thailand deposited its instrument of accession to the Apostille Convention on 30 June 2026, but the Convention is not yet in force for Thailand, so embassy and Department of Consular Affairs legalisation remains the working route. Cost and lead time depend on page count, language pair and the certification steps the receiving authority requires, so every file is quoted before work starts. Send the checklist you were given, the applicant's nationality and the office you will file with 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