Conditions
The whole text, the date and the signature must be in the testator's own handwriting. Typed, computer-printed or third-party-written text is not allowed; parts not handwritten may invalidate the will.
A holographic will (section 1657) must be entirely handwritten, dated and signed by the testator. No witnesses are needed, but it cannot be typed, and any alteration must be handwritten and signed.

A holographic will (section 1657) must be entirely handwritten, dated and signed by the testator. No witnesses are needed, but it cannot be typed, and any alteration must be handwritten and signed.
This form is simple but more open to disputes over handwriting and clarity. This page explains the conditions and how to reduce risk. General information under Book VI of the Thai Civil and Commercial Code; not legal advice on your situation.
The whole text, the date and the signature must be in the testator's own handwriting. Typed, computer-printed or third-party-written text is not allowed; parts not handwritten may invalidate the will.
Erasures, additions or corrections must be handwritten and signed by the testator. For extensive changes, rewrite the entire will.
Identify assets with verifiable details such as title deed, condominium unit, bank and account number, and beneficiaries by full name and ID. Avoid vague wording like "everything to my children" without naming each child and share.
Name an executor and an alternate to reduce disputes over who petitions the court. An executor must not be a minor, of unsound mind or bankrupt.
Tell someone you trust where the original is kept; a will that cannot be found is ineffective in practice. Copies help as reference but the court examines the original.
With significant assets, several heirs or expected challenges, a district-office public-document will or a witnessed ordinary will may better withstand authenticity disputes.




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