Cross-Border Documents — Notarisation, Legalisation, Apostille and Certified Translation

In principle yes; a Thai court can consider a foreign will. However the document must be fully translated and legalised, and its validity must be proved under the applicable law by reference to the Act on Conflict of Laws B.E. 2481, which makes the case slower and more expensive. Foreigners with Thai assets therefore commonly make a separate Thai will covering only Thai-situs property.

Yes. Thai law does not require a will to be in Thai, but a Thai translation is required when it is filed with a court or government office. In practice a bilingual document is preferred, with a clause stating which language version prevails if the texts differ, to reduce the scope for dispute in court.

Currently in three steps: notarisation by a notary public in the country of origin; legalisation by that country's foreign ministry or by the Royal Thai Embassy; then translation into Thai and certification of the translation at the Legalisation Division of the Department of Consular Affairs. Thai courts and Land Offices accept the document as evidence only after that chain is complete.

Thailand has acceded to the Apostille Convention (HCCH 1961) and it enters into force for Thailand on 28 February 2027. From then, public documents from other contracting states will need a single Apostille certificate instead of two-tier legalisation, which will materially shorten the process for documents such as death certificates and foreign court orders. A Thai translation will still be required by the receiving authority.

They can grant a power of attorney, signed before a consular officer at a Royal Thai Embassy or Consulate-General, or before a notary public followed by legalisation. Written consents of heirs for the administrator petition can be authenticated the same way. For Land Office matters the prescribed forms Tor Dor 21 or Or Chor 21 must be used depending on the asset type.

No. Thailand does not automatically enforce foreign court judgments, so a Grant of Probate or Letters of Administration is only supporting evidence. Heirs must still petition a Thai court for the appointment of an estate administrator in respect of assets located in Thailand.

Make a separate Thai will for Thai assets with a clearly stated scope; keep a complete inventory of assets and title documents with copies held by your legal adviser; name a substitute administrator; have foreign marriage and birth certificates translated and legalised in advance; and review the will after every marriage, divorce, birth or significant purchase.

Thailand has no non-court probate route, so banks and the Land Department require a court order appointing an estate administrator before transferring assets — even where a valid will exists. An uncontested petition filed in the court of the deceased's domicile typically takes 45–75 days, after which roughly 30 more days pass before the order becomes final and a certified copy with a finality certificate can be issued for use.

Yes, via a power of attorney to Thai counsel. A POA signed abroad must be notarised or executed before a Thai embassy officer, then legalised through the full chain (Apostille for Hague member states, Thai embassy legalisation otherwise), translated into Thai and certified by the Department of Consular Affairs before filing. Some courts also accept heir testimony by video conference instead of travel.

Legalise the original in the issuing country first (Apostille or Thai embassy legalisation), then translate it into Thai and have the translation certified by the Legalisation Division of the Department of Consular Affairs. Where the deceased was a Thai national, also report the death to the Thai embassy so a Thai death certificate is issued and the name is removed from the house registration — this materially smooths bank and Land Department steps.

It is valid in form if it complies with the law of the place of execution or the testator's national law under the Conflict of Laws Act B.E. 2481. In practice it must still be legalised abroad, translated into Thai, certified by the Department of Consular Affairs and accepted by the Thai court in the administrator petition. That path takes considerably longer than a locally executed Thai will and carries translation-interpretation risk.

Run three workstreams in parallel in week one. First, obtain multiple legalised sets of the death certificate for overseas use. Second, have all heirs sign consent letters and powers of attorney at once while together, or notarise them separately in their own countries. Third, obtain certified Thai civil-registration records evidencing family relationships. Working in parallel typically saves three to five weeks against a sequential approach.

Heirs abroad may appoint a lawyer or trusted person by power of attorney, but the document must be signed before a Thai consular officer at an embassy or consulate, or before a local notary and then legalised in sequence. Prepare the passport, proof of heirship such as a birth or marriage certificate, and the death certificate; the power of attorney should be drafted in wording the court and Land Department accept, signed with certification, translated and certified, then the original sent to Thailand. Powers drafted too broadly are frequently refused by courts and registrars, so have the litigating lawyer draft it before signature.

It can, if it complies with the formal requirements of the country where it was made or with Thai form requirements, since the Thai court examines formal validity and intention — but in practice it must be translated and legalised before use. Prepare the original will or a court-certified copy, the death certificate, certified translations, proof of heirship, and evidence of the Thai assets; certify in the country of execution, legalise at a Thai embassy or the Department of Consular Affairs, translate, then petition the Thai court for an administrator. Dispositions of Thai immovable property may conflict with Thai law and be unenforceable, so make a separate Thai will for Thai assets.

We combine the adviser and the executor-support role: we map the heirs and the asset schedule across every country, identify which assets need a court order and which can transfer directly, draft the administrator petition, file it and follow the hearing schedule, liaise with banks and the Land Department once the order issues, produce translations and legalisation for heirs abroad, and compute and file inheritance tax. Send us the death certificate, house registration, proof of heirship, and the assets you know of. Tax deadlines and the disposal period for a foreign heir's land run in parallel, so start the consultation as soon as possible after the death.