<![CDATA[This study examines the informal credit practice known as bon — a trust-based deferred payment system — that is widely practiced in Madurese-owned grocery stores (Warung Madura) operating across Indonesian urban areas. Despite the well-documented Islamic consciousness of Madurese traders, particularly their deliberate avoidance of bank interest on religious grounds (Hidayat et al., 2023), no prior research has systematically analyzed the bon system through the lens of fiqh muamalah. This study addresses that gap by employing a qualitative descriptive approach with a normative-empirical design, combining in-depth interviews, participatory observation, and documentation with comparative fiqh analysis grounded in classical Islamic jurisprudence and Fatwa DSN-MUI No. 19/DSN-MUI/IV/2001 on Al-Qardh. The findings identify three typologies of bon practice. The first two typologies — characterized by uniform pricing between cash and credit purchases, voluntary tenor, and the absence of any financial surcharge — substantively fulfill the rukun and conditions of qard hasan and are consistent with the maqashid al-shariah principle of hifzh al-mal (wealth preservation). The third typology, however — wherein a hidden price markup is applied to bon customers relative to cash buyers — constitutes riba nasi'ah under fiqh muamalah, regardless of whether the practitioner is aware of its prohibited nature. This finding reveals a critical paradox: traders who consciously reject institutional riba simultaneously operate a functionally equivalent mechanism at the micro-transaction level, indicating a gap between formal-institutional and substantive-jurisprudential Islamic consciousness. The study proposes a five-element shariah-compliant bon model as a practical recommendation for traders and policymakers developing informal Islamic microfinance frameworks in Indonesia.]]>
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