{"id":2979,"date":"2026-07-22T23:01:11","date_gmt":"2026-07-22T16:01:11","guid":{"rendered":"https:\/\/www.thailawonline.com\/last-will-in-thailand\/supreme-court-decisions-last-will-thailand\/"},"modified":"2026-07-22T23:14:11","modified_gmt":"2026-07-22T16:14:11","slug":"supreme-court-decisions-last-will-thailand","status":"publish","type":"page","link":"https:\/\/www.thailawonline.com\/fr\/last-will-in-thailand\/supreme-court-decisions-last-will-thailand\/","title":{"rendered":"Dix d\u00e9cisions de la Cour supr\u00eame tha\u00eflandaise que tout \u00e9tranger r\u00e9digeant un testament devrait conna\u00eetre."},"content":{"rendered":"

We analyzed more than 75 Supreme Court of Thailand (\u0e28\u0e32\u0e25\u0e0e\u0e35\u0e01\u0e32) decisions on wills and succession from our full-text database of Thai case law \u2014 from 1936 to 2025. Most of them matter only to lawyers. These ten matter to you<\/strong>. Each one is a real family’s story, and each one ends in a rule that can save \u2014 or sink \u2014 your estate plan in Thailand.<\/em><\/p>\n

New to the subject? Start with our complete guide to making a last will in Thailand<\/a> (from 3,900 THB, bilingual). For what happens after death, see probate in Thailand<\/a>.<\/p>\n

How to read the citations:<\/strong> “Dika 7200\/2540” means Supreme Court decision no. 7200 of Buddhist Era 2540 \u2014 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.<\/p>\n

1. Yes, your foreign heirs can inherit Thai land \u2014 Dika 7200\/2540 (1997)<\/h2>\n

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 Land Code does not absolutely prohibit foreign ownership. The foreign heir inherits the land<\/strong> \u2014 and must then either obtain permission or sell it within the statutory disposal period under Section 94 of the Land Code<\/a> (in practice 180 days to one year).<\/p>\n

The rule: never write your foreign family out of Thai property. They inherit first, sell later \u2014 and a good will plans that window, for example by pairing the gift with a registered usufruct<\/a> for a surviving spouse.<\/strong><\/p>\n

2. Your unmarried Thai partner inherits nothing \u2014 Dika 2102\/2551 (2008)<\/h2>\n

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 (Section 1657<\/a> requires the testator’s handwriting throughout), and the two witnesses had signed five years after<\/strong> the testator \u2014 so it was void under Section 1705<\/a>. Without a valid will, an unregistered partner is not an heir at all: property acquired during an unregistered union is not marital property.<\/p>\n

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 \u2014 and most preventable \u2014 disaster we see among expats.<\/strong><\/p>\n

3. Everyone signs together, in one sitting \u2014 Dika 997\/2549 (2006)<\/h2>\n

A will circulated for signatures: the testator signed, then it traveled to each witness separately \u2014 the doctor-witness testified the testator was not even present when he signed. Void. Section 1656<\/a> demands the testator sign before both witnesses simultaneously<\/em>, and the witnesses certify the signature then and there. And per Dika 11034\/2553, a will void for this reason can never be “confirmed” back to life afterwards.<\/p>\n

The rule: one room, one ceremony, everyone present, everyone signs. In our analysis of 75+ disputes, this formality killed more wills than forgery ever did.<\/strong><\/p>\n

4. Your beneficiary’s spouse must not witness \u2014 Dika 4001\/2545 (2002)<\/h2>\n

An elderly couple’s will was witnessed by the husband of one beneficiary. Under Section 1653<\/a>, a witness \u2014 or the spouse of a witness<\/em> \u2014 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 \u2014 Dika 5404\/2533 \u2014 but signing is fatal.)<\/p>\n

The rule: witnesses must be adults who take nothing under the will and are married to no one who does. Use neighbors or colleagues, never family of your heirs.<\/strong><\/p>\n

5. You cannot cancel a will by letter \u2014 Dika 6981\/2545 (2002)<\/h2>\n

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 \u2014 chiefly a new will, or intentional destruction of the old document. However clear the letter, however sound his mind, it revoked nothing.<\/p>\n

The rule: to change your Thai will, make a new Thai will \u2014 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).<\/strong><\/p>\n

6. Couples: make two mirror wills, never one joint will \u2014 Dika 1243\/2563 (2020)<\/h2>\n

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 \u2014 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.<\/p>\n

The rule: joint wills promise a permanence Thai law refuses to enforce. We draft separate mirror wills for couples \u2014 two documents, same day, reciprocal terms (blessed by Dika 7057\/2554).<\/strong><\/p>\n

7. Married? You can only give away your half \u2014 Dika 899-900\/2509 (1966)<\/h2>\n

A husband willed specific marital assets in full to his chosen beneficiary \u2014 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 (\u0e2a\u0e34\u0e19\u0e2a\u0e21\u0e23\u0e2a), and a spouse’s signature on the will surrenders nothing. The gift operated pro rata over his share only.<\/p>\n

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 \u2014 see our prenuptial agreement guide<\/a>.<\/strong><\/p>\n

8. A doctor’s certificate can save your will \u2014 Dika 6522\/2561 (2018)<\/h2>\n

Children attacked their mother’s will because she was diagnosed with a psychiatric illness months after signing. The Court refused: capacity is judged only at the moment of execution<\/em> (Section 1654<\/a>) \u2014 and a doctor’s certificate of sound mind issued 17 days before the will was treated as decisive. The will stood.<\/p>\n

The rule: if you are over 65, seriously ill, or expect a family fight, get a doctor’s certificate of sound mind dated the same week you sign. It costs a few hundred baht and has won real cases.<\/strong><\/p>\n

9. Deathbed wills controlled by a beneficiary get destroyed \u2014 Dika 574-575\/2567 (2024)<\/h2>\n

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 \u2014 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 criminal forgery convictions<\/strong>.<\/p>\n

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 \u2014 and possibly a crime.<\/strong><\/p>\n

10. The DIY handwritten will that survived \u2014 Dika 4044\/2567 (2024)<\/h2>\n

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 \u2014 date, dispositions, signature \u2014 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.<\/p>\n

The rule: a fully handwritten, dated, signed will is a legitimate emergency option that needs no witnesses at all (Dika 8018\/2547) \u2014 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.<\/strong><\/p>\n

The new 2026 rules for wills in Thailand<\/h2>\n

A new Ministerial Regulation, published in the Government Gazette in January 2026 and effective 24 March 2026<\/strong>, replaced the 1960-era rules on wills made at district offices (\u0e2d\u0e33\u0e40\u0e20\u0e2d). It does not change who inherits \u2014 the Civil and Commercial Code still governs \u2014 but it standardizes procedure nationwide:<\/p>\n