<![CDATA[The financial sustainability of private Islamic senior secondary schools in Indonesia represents a strategic challenge that has received limited scholarly attention through systematic financial sustainability frameworks. This study aims to diagnose the sustainability of financing, analyze the orientation of educational investment, and evaluate budgeting practices through the lens of Islamic Education Management (IEM) at Madrasah Aliyah Mathla'ul Anwar Pameuntasan, Bandung Regency. A qualitative approach with a single case study design was employed; data were gathered through semi-structured interviews with three key informants guided by a structured interview protocol encompassing four thematic domains, field observation, and documentary analysis of e-RKAM data for fiscal year 2025, analyzed using the Miles–Huberman–Saldana interactive model supplemented by Herfindahl–Hirschman Index (HHI) calculations. Findings indicate: (1) revenue concentration formally reaches HHI = 1.0 with a 0% operating margin and no financial reserves, signaling a financially vulnerable condition; (2) a critical investment allocation distortion exists between physical infrastructure (19.6%) and teacher professional development (0.5%); and (3) the institution partially fulfills the amanah and shaffafiyyah principles but remains deficient in the maslahah and istimrar dimensions. Two testable propositions are advanced, and this study contributes an integrative, e-RKAM-based diagnostic framework for private Islamic secondary schools within an IEM context.]]>
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