| Foreign birth, marriage or divorce record | The civil registrar or court of the issuing country | Authenticated up the origin-country chain, then legalised by the Royal Thai Embassy there. Before 28 Feb 2027 an Apostille is not yet usable with Thai authorities. | Translated into Thai after the stamps are complete, then the translation is legalised at the Department of Consular Affairs. | The immigration office for the area, or the district office when the record is used for a registry act. | Reversing the order is the most common cause of a bounce — translating before the stamps usually means translating again. |
| Foreign degree certificate and transcript | The awarding institution | The institution issues an official copy which then passes the origin-country authenticating body and the Royal Thai Embassy. | Translated into Thai where the Department of Employment or the receiving body requires it. | The Department of Employment or the provincial employment office, filed through the employer. | The field of study must line up with the job title in the contract, otherwise the file draws further questions. |
| Employment contract and employer letters | The Thai employer or the overseas parent company | Thai company papers are filed as certified copies under company seal; overseas company papers run the origin-country chain. | Translated into Thai when the source is not in Thai. | The Department of Employment, and immigration at the extension stage. | The salary in the contract must match what the visa file and the tax papers state. |
| Financial evidence: statements, pensions and income | The bank or the pension-paying body | A Thai bank issues an original balance-confirmation letter; a foreign statement runs the origin-country chain. | Translated into Thai or English as the receiving body directs. | Immigration, or the body assessing eligibility such as the BOI for LTR. | Freshness matters more than the amount — an old confirmation letter is often asked for again on the filing day. |
| Police certificate issued abroad | The national police or criminal-records body of that country | Authenticated in the origin country, then legalised by the Royal Thai Embassy. | Translated into Thai, carrying over every result code and every seal. | Whichever body asked for it — commonly the Department of Employment or a sector licensing body. | The acceptable age is set by the receiving body, not the issuer — ask before ordering it. |
| Medical certificate for a work permit | A physician licensed to practise in Thailand | Issued in Thailand, so no foreign authentication chain applies. | Normally issued in Thai already, so no translation is needed. | The Department of Employment together with the employer bundle. | The form and the conditions it must address are set by the authority and can change — check the current form before the appointment. |
| TM.30 residence notification and TM.47 90-day report | Filed by the house-master, owner, possessor or manager of the residence; the TM.47 is filed by the foreigner. | No legalisation, but proof of the right to the residence is attached — typically the house registration and the house-master's ID. | A translation is attached when the lease is in a foreign language. | The local immigration office or the Immigration Bureau's online notification system. | This duty sits with the person in control of the residence, not the tenant, and failure to notify carries a penalty under the Immigration Act. |
| Thai documents sent to a foreign mission | The district office, Department of Provincial Administration, or the Thai body that issued the record. | Obtain a certified extract from the issuing body, then legalise the translation at the Department of Consular Affairs. | Translated into the language the destination mission requires — usually English. | The destination embassy or consulate in Bangkok. | Some missions require consular legalisation first and some do not want it — check that mission's rule before starting. |