<![CDATA[Government procurement of goods and services, as the largest instrument of state expenditure, must be imbued with divine values in accordance with Article 29 of the 1945 Constitution of the Republic of Indonesia, which in the context of Indonesia's Muslim majority population contains the potential for the integration of shariah principles. However, empirical reality demonstrates delayed contractor payments that disrupt cash flow and project continuity, as evidenced by the Waskita Karya case of 2023. This study aims to analyze the historical evolution of shariah principle influence in the Indonesian government procurement system and the extent to which its implementation provides legal certainty of payment for contractors. The research employs a normative legal research method with historical, statutory, and conceptual approaches, analyzing hierarchical regulations from the 1945 Constitution to implementing regulations using the theories of Savigny (historical jurisprudence), Radbruch (the purpose of law), and maqashid syariah (hifdz al-mal). The results demonstrate shariah evolution through four periods: the pre-regulation era (1973 to 1999, shariah vacuum), the reform era (2000 to 2007, independent regulation), SBSN integration (2008 to 2017, Law No. 19/2008), and expansion (2018 to the present, Government Regulation No. 16/2023). Substantive implementation is present through the State Treasury Law No. 1/2004, Ministry of Finance Regulation No. 145/2017 (advance payment), and Government Regulation No. 22/2020 (14-day limit), yet remains empirically problematic due to bureaucratic obstacles and weak enforcement. The study concludes that the pattern of gradual shariah penetration has succeeded in the financing domain (SBSN), but remains partial in the procedural domain. The recommendations include explicit codification of shariah contractual principles and late-payment sanctions for comprehensive legal certainty]]>
