A declaration or certificate of heirship — what should you know about willform-related requirements?

This question is specifically about “A declaration or certificate of heirship”, so the answer below starts with what this case actually needs before setting out the general rules. Estate work has to close the family chain: household records, marriage records and the death certificate. The deceased's and heirs' names must be spelled identically throughout; if not, add evidence they are the same person. When several certification layers are required, start with the slowest one. Plan the schedule with room for at least one review cycle at the receiving office. Record the reference number of each certification layer; it is the fastest way to trace status. If the receiving body confirmed its requirements by email, keep that message with the file. The deciding factor is the receiving body's requirement, not only the format of the Thai-side document. A key variable is the filing channel (in person, agent or online), which sets the copy format to prepare. Before starting, confirm with the receiving body whether it wants an original, a certified copy or a certified translation, then check that names are spelled identically to the passport or ID card on every page, then verify the source document is still within any validity window the recipient applies. The specifics here are document type: Heirdeclare, and those decide which translation and certification level applies. The terms that frame this page are declaration · certificate · heirship · know. The next step is confirming the filing channel and the copy or file format required. The Civil and Commercial Code recognises several forms of will in sections 1655 to 1663: the ordinary written will with two witnesses, the holograph will written entirely in the testator's own hand, the will made as a public document before the district officer, the secret-document will and the oral will in exceptional circumstances. Each form has its own signature, date and witness conditions. A document provider neither drafts a will nor certifies its validity; its role is to render the text completely and literally so the receiving party can read and verify it. Succession in Thailand is governed by the Civil and Commercial Code, Book VI on Succession, which sets out the classes of statutory heirs and their shares from section 1629 onwards, with the lawful spouse inheriting alongside the statutory heirs in the order fixed by law. Translations must therefore reproduce names, dates of birth, identification numbers and registered relationships identically across every document, because the receiving authority uses exactly those details to establish heirship. ILC handles documents only — translation, certified translation, arranging notarial-attorney certification and running legalisation at the Department of Consular Affairs and embassies. It is not a law firm, does not draft wills as legal counsel, does not act as estate administrator, does not pursue claims on a policyholder's behalf and guarantees no decision by any court, registrar or insurer. Cost and lead time depend on page count, target language, how many certified sets are needed and the steps the receiving authority requires, so every file is quoted before work starts. Send scans of every page together with the written requirements from the court, bank, insurer or receiving authority 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