Affidavit of Single Status — Template, Signing and Certification in Thailand

A document of this kind is accepted or refused on four elements: the identity of the person making it, the scope of what is authorised or declared, the period during which it applies, and the manner in which it is signed. If any of the four is ambiguous, the receiving officer has no basis to act on it and will return it.

Identity means the full name exactly as written in the passport or the Thai identity card, the document number, and the address as registered. Scope means an enumerated list of acts rather than a general phrase; authorities in Thailand and abroad routinely refuse open-ended authority. Period means an explicit start date and either an end date or a defined completing event. Manner of signing means a wet signature by the person named, made in the presence of the certifying attorney where certification is required.

This document normally requires notarial certification. In Thailand the certification is performed by a lawyer registered as a Notarial Services Attorney with the Lawyers Council of Thailand under Royal Patronage; the signatory must appear in person with the original identity document, because the attorney certifies that the signature was made in their presence.

A Thai document destined for use abroad normally passes through four controlled stages. First, the original is verified against the issuing register — a civil registry extract from a district office (amphoe), an academic record from the university registrar, or a corporate record from the Department of Business Development. Second, the document is translated by a translator whose signature the Ministry of Foreign Affairs recognises, with the translator's declaration attached to the translation.

Third, where the receiving party requires a notarial act, the signature, the copy or the declaration is certified by a Notarial Services Attorney registered with the Lawyers Council of Thailand under Royal Patronage. Thailand has no civil-law notary profession; the Notarial Services Attorney is the statutory equivalent, and foreign authorities that ask for a "notary public" accept this certification. Fourth, the Legalization Division of the Department of Consular Affairs, Ministry of Foreign Affairs, legalizes the document, and the destination embassy attests it when its own rules still require attestation.

Thailand deposited its instrument of accession to the HCCH Convention of 5 October 1961 Abolishing the Requirement of Legalisation for Foreign Public Documents on 30 June 2026, and the Convention enters into force for Thailand on 28 February 2027. Until that date the traditional chain — certified translation, notarial certification, Ministry of Foreign Affairs legalization and, where required, embassy attestation — remains the operative route.

Replace every placeholder; do not leave a blank field, and do not strike out a clause by hand. A handwritten deletion turns a clean document into one that a certifying attorney must annotate, and an annotated document invites questions at the receiving end. If a clause does not apply, remove it before printing and renumber the remaining clauses.

Print single-sided on A4, sign each page in the margin as well as at the signature block, and keep the pagination visible ("page 1 of 3"). Where the document will be used abroad, prepare the Thai and English versions as a single bilingual instrument or as two versions signed on the same date, so the certifying attorney can certify both together.

Attach the supporting documents the recipient will ask for: a copy of the identity document of the signatory, and — for corporate signatories — a current company affidavit and the certified list of authorised directors. Those attachments are certified with the main document, not afterwards.

Every file is checked against the written requirement of the receiving authority before work starts: the exact document list, the accepted translation language, whether a certified copy or the original is required, and whether the authority accepts a scanned advance copy. Rejections abroad are almost never caused by translation quality; they are caused by a missing link in the chain, an expired supporting document, or a name spelled differently from the passport.

Names are therefore transliterated exactly as they appear in the machine-readable zone of the passport, dates are rendered in the calendar the receiving authority uses (Gregorian for all foreign submissions, with the Buddhist-era original retained in brackets where the source shows it), and every certified translation keeps the layout of the source so that a reviewer can compare the two side by side.

For a document-by-document assessment and a written quotation, contact our coordinators by phone 083-249-4999, LINE @NYCLI or email nyclegal@ilc.ltd. We confirm the requirements of the receiving authority before any file is opened, so nothing is translated or certified unnecessarily.