The practice of deputy ministers concurrently holding positions as commissioners of State-Owned Enterprises (SOEs) has long constituted an unresolved constitutional issue in Indonesian positive law. Article 23 of Law Number 39 of 2008 on State Ministries only prohibits concurrent office-holding for ministers, thereby creating a legal gap that has been exploited systematically. This study aims to analyze the legal considerations of judges, the legal implications, and the siyasah dusturiyah perspective on Constitutional Court Decision Number 128/PUU-XXIII/2025 concerning the prohibition of concurrent office-holding for ministers and deputy ministers. The method employed is normative juridical research utilizing a statute approach and case approach, with descriptive-prescriptive qualitative analysis. The findings reveal three principal conclusions: first, the Constitutional Court constructed its legal reasoning upon the principles of equality before the law, legal certainty, and good governance, employing conditional constitutional interpretation to extend the normative scope of Article 23 to deputy ministers; second, the decision carries erga omnes effect, producing significant normative-legislative, executive-institutional, and constitutional jurisprudential implications, including the obligation to relinquish concurrent positions within a two-year grace period; third, the siyasah dusturiyah perspective affirms the prohibition through the principles of amanah, 'adl, al-wizārah, and maslahah mursalah, all of which are substantively convergent with the decision's ratio decidendi. This study concludes that the prohibition on concurrent office-holding is not merely a formal legal obligation, but an ethical and moral imperative intrinsic to the nature of trustworthy leadership in both Islamic governance and modern constitutionalism.