มาตรา 150 — Acts contrary to public order or good morals are void

Firm annotation

Section 150 is the most frequently cited 'nullity' provision in Thai contract litigation. Courts regularly invoke it to strike down: (a) sham land transactions designed to evade the foreigner-ownership prohibition under the Land Code; (b) loan agreements with criminal interest rates; (c) employment terms that contract out of mandatory labour protections; and (d) prenuptial provisions inconsistent with §1465. Once a court declares an act void under §150 the parties are restored to the position they would have occupied had the act never been made, subject to restitution under §391.