Dix décisions de la Cour suprême thaïlandaise que tout étranger rédigeant un testament devrait connaître.

Révisé par ThaiLawOnline, un cabinet d'avocats thaïlandais agréé exerçant en Thaïlande depuis 2006. Avocate thaïlandaise en charge du dossier : Wichuda Atthamethakon, LL.M., licence du barreau thaïlandais 3149/2556.

Dernière mise à jour le 5 septembre 2026

We analyzed more than 75 Cour suprême of Thailand (ศาลฎีกา) decisions on wills and succession from our full-text database of Thai case law, from 1936 to 2025. Most of them matter only to lawyers. These ten matter to toi. Each one is a real family’s story, and each one ends in a rule that can save, or sink, your domaine plan in Thailand.

Vous découvrez le sujet ? Commencez par notre Guide complet pour rédiger un testament en Thaïlande (à partir de 3 900 THB, bilingue). Pour en savoir plus sur ce qui se passe après la mort, voir : successions en Thaïlande.

Comment lire les citations : “Dika 7200/2540” means Supreme Court decision no. 7200 of Buddhist Era 2540, subtract 543 for the Western year (1997). Thailand is a civil-law country, so these rulings are not formally binding precedent, but every Thai court follows them in practice.

1. Yes, your foreign heirs can inherit Thai land, Dika 7200/2540 (1997)

The single most misunderstood point in expat estate planning. A Chinese national willed part of a land plot to his foreign nephew; the widow argued that leaving Thai land to a foreigner is void. The Supreme Court disagreed: the Code foncier does not absolutely prohibit foreign ownership. The foreign heir hérite du terrain, and must then either obtain permission or sell it within the statutory disposal period under Article 94 du Code foncier (en pratique, de 180 jours à un an).

The rule: never write your foreign family out of Thai property. They inherit first, sell later, and a good will plans that window, for example by pairing the cadeau with a registered Usufruit pour le conjoint survivant.

2. Your unmarried Thai partner inherits nothing, Dika 2102/2551 (2008)

A man lived for years with his partner without registering the marriage. He typed a will leaving her his house, land and guns. After his death, his mother took everything. The typed document could not be a holographic will (Article 1657 requires the testator‘s handwriting throughout), and the two witnesses had signed cinq ans après the testator, so it was void under Article 1705. Without a valid will, an unregistered partner is not an heir at all: property acquired during an unregistered union is not biens matrimoniaux.

The rule: if your marriage is not registered at the district office, your partner’s only protection is a properly executed will. This is the most common, and most preventable, disaster we see among expats.

3. Everyone signs together, in one sitting, Dika 997/2549 (2006)

A will circulated for signatures: the testator signed, then it traveled to each witness separately, the doctor-witness testified the testator was not even present when he signed. Void. Article 1656 exige que le testateur signe devant les deux témoins simultanément, Les témoins authentifient alors la signature. Or, conformément à la décision Dika 11034/2553, un testament nul pour ce motif ne peut jamais être rétabli ultérieurement.

La règle : une pièce, une cérémonie, tous les participants présents, tous signataires. D’après notre analyse de plus de 75 litiges, cette formalité a entraîné l’annulation de plus de testaments que la falsification.

4. Your beneficiary’s spouse must not witness, Dika 4001/2545 (2002)

Le testament d'un couple de personnes âgées a été signé en présence du mari de l'un des bénéficiaires. Article 1653, a witness, ou le conjoint d'un témoin, cannot take under the will: the gift to that beneficiary was struck out, though the rest of the will survived. (Merely being present in the room is harmless, Dika 5404/2533, but signing is fatal.)

La règle : les témoins doivent être majeurs, ne rien recevoir au titre du testament et ne pas être mariés à une personne qui en reçoit. Choisissez des voisins ou des collègues, jamais des membres de la famille de vos héritiers.

5. You cannot cancel a will by letter, Dika 6981/2545 (2002)

The day before he died, a man signed a letter confirming his first will and “cancelling” two later ones. The Supreme Court held the letter legally worthless: a will can be revoked only by the methods the Code prescribes, chiefly a new will, or intentional destruction of the old document. However clear the letter, however sound his mind, it revoked nothing.

The rule: to change your Thai will, make a new Thai will, and open it with an express clause revoking all earlier wills. Without that clause, an old will survives wherever it does not directly conflict with the new one (Dika 2832-2833/2558).

6. Couples: make two mirror wills, never one joint will, Dika 1243/2563 (2020)

A husband and wife made one joint will forbidding either spouse from changing it after the other’s death. After the husband died, the widow made a new will anyway, cutting out one son. The Supreme Court upheld her: no clause can take away a person’s freedom to revoke their own will; the “irrevocability” promise was one testator’s stipulation about another person’s property, and void.

The rule: joint wills promise a permanence Thai law refuses to enforce. We draft separate mirror wills for couples, two documents, same day, reciprocal terms (blessed by Dika 7057/2554).

7. Married? You can only give away your half, Dika 899-900/2509 (1966)

A husband willed specific marital assets in full to his chosen beneficiary, his wife even thumbprinted the will as a “consenting witness.” The Court was unmoved: a married testator disposes only of his own share of the marital property (สินสมรส), and a spouse’s signature on the will surrenders nothing. The gift operated pro rata over his share only.

The rule: for a foreigner married to a Thai (or vice versa), the will covers only your 50% of marital assets. That is why we always ask about the marriage, the prenuptial, and both spouses’ wills together, see our guide des contrats prénuptiaux.

8. A doctor’s certificate can save your will, Dika 6522/2561 (2018)

Les enfants ont contesté le testament de leur mère, car celle-ci avait reçu un diagnostic de maladie psychiatrique quelques mois après l'avoir signé. Le tribunal a refusé : la capacité de la mère est évaluée. seulement au moment de l'exécution (Article 1654), and a doctor’s certificate of sound mind issued 17 days before the will was treated as decisive. The will stood.

La règle : si vous avez plus de 65 ans, êtes gravement malade ou prévoyez une dispute familiale, faites établir un certificat médical attestant de votre intégrité mentale, daté de la semaine même de la signature. Cela coûte quelques centaines de bahts et a déjà permis de gagner des procès.

9. Deathbed wills controlled by a beneficiary get destroyed, Dika 574-575/2567 (2024)

Four days after being taken from hospital into the home of a family she had been in litigation against, an 89-year-old widow with terminal cancer and dementia-like confusion thumbprinted a will leaving everything to her caretaker, who then petitioned to have her declared incompetent, and later bought a house for a witness’s daughter. The Supreme Court voided the will: she could neither resist nor understand the document, so she never made a will at all. In the criminal mirror-image, Dika 4337/2565 (2022), procuring a dementia patient’s thumbprint on a prepared will brought condamnations pour faux en écriture.

The rule: plan while healthy. A will signed in the last weeks of life, arranged by the person who benefits from it, is presumptively doomed, and possibly a crime.

10. The DIY handwritten will that survived, Dika 4044/2567 (2024)

A man filled a pre-printed will form with nearly three pages of handwritten dispositions, dated and signed it. The lower courts voided it; the Supreme Court reversed: because every operative word, date, dispositions, signature, was in his own hand, it qualified as a holographic will under Section 1657, printed frame notwithstanding. Contrast Dika 1223/2551, where an army general’s form will failed: with one defective witness, his handwritten fragments (names and blanks) meant nothing on their own.

The rule: a fully handwritten, dated, signed will is a legitimate emergency option that needs no witnesses at all (Dika 8018/2547), but one typed word in the operative text, or one witnessing slip on a form, and it dies. For anything you care about, execute a witnessed or district-office will properly.

New for 2026: your foreign marriage makes you an heir, Dika 170/2569 (2026)

A couple married in Florida in 1990. When the husband died in Thailand, a relative argued the widow was no spouse at all because the marriage had never been registered at a Thai district office. The Supreme Court (black case no. พ.630/2568, on appeal from the Cour d'appel Region 6) disagreed: under Section 1459 paragraph 1 of the Civil and Commercial Code and Section 20 of the Conflict of Laws Act B.E. 2481, a marriage validly celebrated abroad is valid in Thailand, no Thai registration or re-registration required, and the widow inherited as a statutory heir. To prove the 35-year-old marriage, the court accepted just three documents: the foreign marriage record, an authentication from the issuing office (the Clerk of Court of Miami-Dade County), and a certified Thai translation. In the same case the deceased’s district-office will had already been held void, for failing the formalities of Section 1658 and therefore void under Section 1705, but that was decided by the Court of First Instance and not appealed, so it was final before the Supreme Court and the Supreme Court never ruled on it. One more reminder that even an “official” will can die on formalities.

The rule: a marriage validly celebrated where it took place is valid in Thailand and makes the surviving spouse a statutory heir, without Thai registration. Keep your foreign marriage record, an authentication and a certified translation on file. Read our full analysis of Dika 170/2569 on foreign marriages and inheritance.

New for 2026: your executor cannot keep the estate, and the one-year deadline will not protect them, Dika 284/2569 (2026)

A man died in 1993 leaving land to seven heirs. The court appointed one of the heirs as estate administrator. Instead of distributing the land, she registered it in her own name, gave it to a relative, and the relative gave it to another heir, who subdivided the plot and sold part of it for 3,000,000 baht. When the other heirs sued, decades after the death, the defendant pleaded Article 1754 of the Civil and Commercial Code: an heir must bring an inheritance claim within one year of the death (or of learning of it), and never more than ten years after the death.

The Supreme Court (published July 2026) rejected the defence. Under Article 1748, an heir in possession of estate property that has not yet been distributed can demand partition even after the one-year period has run. An administrator who registers estate land in her own name and passes it on by gift has not completed the administration; the land remains undistributed estate property, held for all the heirs (Sections 1719 and 1784). The Court ordered the remaining land back into the estate and made the defendant return 2,500,000 baht, five sixths of the sale price. It declined to strip him of his own share under Section 1605 (exclusion of an heir who misappropriates estate property), a sanction the Court applies narrowly.

The rule: choose your executor as carefully as your heirs. An executor who treats estate property as their own gains no shelter from the one-year rule, and every relative who received the property as a gift has to give it back. If you are an heir living abroad and the paperwork has gone quiet, check the title deed at the Land Office; discovering the problem years later is not necessarily fatal. Read our full analysis of Dika 284/2569 on inheritance claims after one year.

Les nouvelles règles de 2026 concernant les testaments en Thaïlande

Un nouveau règlement ministériel, publié au Journal officiel en janvier 2026 et entrant en vigueur 24 mars 2026, replaced the 1960-era rules on wills made at district offices (อำเภอ). It does not change who inherits, the Civil and Commercial Code still governs, but it standardizes procedure nationwide:

• Formulaires officiels. Les bureaux de district utilisent désormais des formulaires standardisés du Département de l'administration provinciale (DOPA) pour les testaments officiels, les testaments secrets et les testaments oraux d'urgence.
• Contrôle des capacités. Officials must verify that the testator is of legal age, of sound mind, and acting voluntarily without coercion, a written trail that makes the amphore will even harder to attack (recall Dika 1518/2561: the challenger already bears the burden of proof).
• Enregistrement et scellement. Every will is entered in official ledgers with a registration number, sealed and cross-referenced, ending decades of inconsistent local practice.
• Frais réduits. Les frais officiels s'élèvent à 250 bahts, ce qui fait du bureau de district le service de testament supervisé par des professionnels le moins cher de Thaïlande.
• Déshéritage et renoncement. Il existe désormais des procédures formelles pour enregistrer une déshéritation, sa révocation et la renonciation à un héritage auprès du bureau de district.

Since 24 March 2026, we recommend the official-document will more often than before, especially for elderly testators, usually alongside a bilingual lawyer-drafted will covering the details district forms cannot handle (foreign assets, disposal windows for land passing to foreign heirs, digital assets, executor powers).

Planning to use a trust? Thai law says no, Section 1686

Les clients originaires de pays de common law nous demandent constamment d'inclure une fiducie testamentaire dans leur testament thaïlandais. Le droit thaïlandais est clair : en vertu de la loi thaïlandaise, Article 1686 Selon le Code civil et commercial, une fiducie créée directement ou indirectement par testament n'a aucun effet.. The only exception, capital-market trusts under the Trust for Transactions in Capital Market Act B.E. 2550 (2007), is for REITs and securitization, not families.

Ce qui fonctionne à la place : une fiducie étrangère pour votre non-thaïlandais assets (never for Thai land, there is no way to register trustee title here), a Thai will for Thai assets, a registered usufruct or right of habitation for a surviving spouse, a foundation (มูลนิธิ) for charitable aims under Sections 1676-1677, et un “ contrôleur des biens ” (ผู้ปกครองทรัพย์) en vertu de l'article 1686 et suivants. pour les héritiers mineurs. Analyse complète : fiducies en Thaïlande via des juridictions étrangères.

Avant d'acheter un testament thaïlandais, vérifiez cinq points.

Internet propose de nombreux modèles de testaments thaïlandais. Avant de confier votre succession à l'un d'eux, posez-vous les questions suivantes :

1. Le nom d'un avocat thaïlandais agréé y figure-t-il ? Les litiges relatifs aux testaments se déroulent en Thaïlande, devant des juges thaïlandais et selon la jurisprudence thaïlandaise. Un rédacteur qui ne peut comparaître devant un tribunal thaïlandais ne peut garantir la validité du document.
2. Le rédacteur est-il physiquement en Thaïlande ? Execution is where wills die (see rules 3, 4 and 9 above). Someone must be able to supervise the signing ceremony, or fix it when the amphur asks questions.
3. Est-ce conforme à la réglementation de 2026 ? Un modèle mis à jour pour la dernière fois il y a des années ne connaît rien aux formulaires DOPA, à l'option d'amphur à 250 bahts ni à la déshéritation enregistrée.
4. Cite-t-il des décisions de justice réelles ? Chaque avertissement sur cette page est accompagné d'un numéro Dika vérifiable. Si un fournisseur ne peut pas vous fournir de jurisprudence, il s'agit de suppositions.
5. Qui conserve le testament, et qui existera encore à votre mort ? A will nobody can find is a will that never existed. We store clients’ wills and our firm has operated in Thailand since 2006, more than 300 wills drafted, none invalidated by a court.

Notre service bilingue de rédaction de testament (3 900 THB) is drafted by Thai lawyers against the case law above, or Veuillez nous envoyer votre testament actuel. et nous la comparerons à ces dix décisions.

Les instruments juridiques sous-jacents à cet article

Every citation above can be checked against the primary sources we maintain, built and updated by our own lawyers:

• Le Code civil et commercial thaïlandais en anglais, including Livre VI : Succession et les principales dispositions testamentaires Article 1656, Article 1657 ET Article 1658
• Le code foncier thaïlandais, for the foreign-heir disposal rules in Sections 93-94
• Notre collection de décisions de la Cour suprême, curated Dika rulings in English
• Our will drafting service, un testament thaïlandais bilingue rédigé par un avocat thaïlandais
• Que se passe-t-il si vous décédez sans testament en Thaïlande ?
• Glossaire juridique thaïlandais et le Bibliothèque juridique thaïlandaise
• Notre assistant juridique IA, entraînés sur la même base de données de lois et de décisions que celle utilisée pour cette analyse

Foire aux questions

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Authors: Sebastien H. Brousseau, LL.B., B.Sc. (managing Thai law firms since 2006) and Wichuda Atthamethakon, LL.M., Thai lawyer and notarial services attorney. Case digests are based on the full Thai texts of the cited decisions in ThaiLawOnline’s database of Supreme Court judgments (1920-2026). This article is information, not legal advice. Last updated August 2026; new decisions added as published.