This study analyzes the implementation of wasiat wajibah for non-Muslim heirs under Article 209 of the Compilation of Islamic Law (Kompilasi Hukum Islam) in Indonesia. The issue of inheritance involving religious differences remains a complex legal problem within Indonesian Islamic inheritance law because classical Islamic jurisprudence generally prohibits inheritance between Muslims and non-Muslims. Nevertheless, judicial practice in Indonesia has demonstrated the expansion of wasiat wajibah through several Supreme Court decisions granting mandatory bequests to non-Muslim family members. This research employs normative juridical legal research using statutory, conceptual, and case approaches. The legal materials consist of statutory regulations, judicial decisions, books, and scholarly journal articles related to Islamic inheritance law and wasiat wajibah. The results of this study show that Indonesian Religious Courts and the Supreme Court have adopted progressive legal interpretations of Article 209 KHI through legal discovery (rechtsvinding) and substantive justice approaches. The implementation of wasiat wajibah for non-Muslim heirs reflects efforts to harmonize Islamic legal principles with humanitarian values, social justice, and the pluralistic character of Indonesian society. However, the absence of explicit regulation regarding non-Muslim heirs within Article 209 KHI potentially creates legal uncertainty and inconsistent judicial interpretations. Therefore, clearer legal reform is necessary to strengthen legal certainty concerning inheritance disputes involving religious differences in Indonesia
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