This research discusses the regulation of marriage agreements in Indonesian contract law Marriage contracts in Indonesia have undergone flexible developments following the Constitutional Court Decision Number 69/PUU-XIII/2015, but in practice, they are often misused to deviate from the sacred nature of marriage for certain motives. This research aims to identify the regulation of prenuptial agreements based on contract law in Indonesia and to analyze the considerations of the Kebumen District Court judges in deciding the annulment of prenuptial agreements thru the study of Decision Number 10/Pdt.G/2022/PN. Kbm. The research method used is normative juridical with a library approach to qualitatively analyze primary and secondary legal materials. The research results show that the agreement on the separation of property in marriage is valid and binding on the parties like the law, as long as it meets the valid requirements of Article 1320 of the Civil Code, the Marriage Law, and the Compilation of Islamic Law. However, regarding Decision Number 10/Pdt.G/2022/PN. Kbm, the Panel of Judges rightly declared the marriage agreement null and void by law because its content violated the objective valid requirements (lawful cause). The limitation of the biological relationship between husband and wife and the use of the marriage bond merely as a business formality are deemed to clearly violate moral norms, public order, and undermine the fundamental purpose of marriage as mandated in Law Number 1 of 1974, which has been amended by Law Number 16 of 2019.
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