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

The subject of this page is “An investor from Singapore certifying under the Thai-US Treaty of Amity”, so it deals with the case-specific points first and the shared rules afterwards. Plan the schedule with room for at least one review cycle at the receiving office. Leave buffer time in case a translation has to be amended or a source document re-issued. Note who signed each certification and on what date for later reference. Attach a document index to the bundle so nothing is lost during review. After certification, scan the full set before it leaves your hands. The specifics here are destination: Sg, and those decide which translation and certification level applies. The terms that frame this page are investor · Singapore · certifying · under. The common failure in this group of cases is a translation that does not match the certification type required. The deciding factor is the receiving body's requirement, not only the format of the Thai-side document. 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 verify the source document is still within any validity window the recipient applies. 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