Mudarabah

A mudarabah has two sides. The rab-ul-mal (capital provider) puts up the money and has no say in day-to-day management. The mudarib (working partner) runs the venture, trades with the capital, or manages the investment, and contributes no cash of their own, only effort and expertise. Before the venture starts, both sides agree on a profit-split ratio, say 60/40 or 70/30. If the venture makes money, profit is divided according to that ratio. If the venture loses money and the mudarib managed it honestly and within the agreed scope, the capital provider absorbs the full financial loss; the mudarib simply loses the time and effort invested. This asymmetry is deliberate: since the mudarib has no capital at risk, the structure would collapse into an interest-free loan with unlimited downside for the working partner if losses were shared too.

Mudarabah is often confused with musharakah, a related but distinct Islamic partnership contract. In a musharakah, all partners contribute capital (even in unequal amounts) and typically all can participate in management. Profit is split by agreement, but losses are shared strictly in proportion to each partner's capital contribution. Mudarabah is narrower: only one side puts up money, and only that side bears loss. Islamic banks use both structures. A bank's investment or savings account is frequently built as a mudarabah, where depositors are the rab-ul-mal and the bank is the mudarib investing the pooled deposits, and returns to depositors vary with the bank's actual investment performance rather than being fixed like conventional interest.

Mudarabah is the conceptual ancestor of why owning shares in a company can be halal even though lending it money at interest is not. When you buy a stock, you are not lending the company cash and demanding a fixed return regardless of outcome. You become a part-owner, and your return (dividends, share price appreciation) rises and falls with the company's actual performance, the same profit-and-loss logic that underlies mudarabah. That is a core reason equity ownership is treated differently from interest-bearing debt in Islamic finance: risk-sharing is permitted, and often encouraged, while guaranteed, risk-free returns on money lent are not.

Beyond bank deposit accounts, mudarabah structures appear inside sukuk (mudarabah sukuk represent a stake in a mudarabah venture rather than a debt claim), in some Islamic private equity and venture capital arrangements, and in historical Islamic commercial law as the model for financing a merchant's trading expedition with someone else's capital. It remains one of the two or three foundational contracts, alongside murabaha and ijara, that Islamic financial institutions use to build products that avoid interest while still channeling capital to productive use.