Rab al-Maal

Rab al-Maal (Arabic: رب المال, literally 'owner of capital') is the capital provider or silent investor in a Mudarabah contract who supplies the entire investment capital while the Mudarib (managing partner) contributes expertise and management. The Rab al-Maal shares in profits according to the pre-agreed ratio and bears all financial losses in proportion to their capital — the Mudarib loses only time and effort. The Rab al-Maal does not participate in day-to-day management; their role is purely passive investment. They may, however, impose legitimate conditions on the Mudarib (such as restrictions on asset types or geographic scope). In modern Islamic banking, retail depositors placing funds in investment accounts act as Rab al-Maal, with the bank as Mudarib. In Islamic fund structures, unit-holders are Rab al-Maal. The Rab al-Maal's liability is strictly limited to the contributed capital — they cannot be held personally liable for the Mudarib's business debts beyond the invested amount.