Ottoman cash waqfs reframed lending as charity

Traditional Islamic charitable endowments (waqf) tied up capital permanently in a specific piece of land or a building, generating income only from renting that fixed asset; land isn't liquid, can't be redeployed as needs shift, and produces only whatever a specific property happens to earn. Meanwhile Islamic law's ban on riba (interest) made it legally fraught to simply lend money out for profit, the obvious way to make a pool of cash productive and self-sustaining.

Sultan Süleyman's jurists needed both to fund growing charitable needs, schools, hospitals, poor relief, and to do it without an endowment that either sat inert in bricks and mortar or ran afoul of usury law the moment it tried to earn a return on cash. In 1548, a formal decree lifted the earlier prohibition on endowing cash itself, but only by carefully framing the return borrowers paid as istirbah (profit-share) rather than riba, a semantic and legal distinction Ottoman scholars debated for centuries afterward.

Endowed cash itself, relent it to borrowers, and reframed the return as profit-share, not interest, so the capital stayed liquid and could grow by reinvesting surplus.

Structuring the endowment as a revolving loan fund, with surplus beyond operating costs added back to capital each year rather than distributed, meant a cash waqf's lending pool could grow over time r

The mechanism depends on borrowers actually repaying reliably enough that the revolving fund's capital base doesn't erode through defaults, since a loan-based endowment carries genuine credit risk a r

Any organization that needs to fund an ongoing mission perpetually, rather than off a one-time gift, should consider structuring the endowment itself as a revolving loan fund whose returns are reinves

By 1767, Bursa's cash waqfs served roughly 6,648 borrowers a year, about 10 percent of the city's population of 60,000, injecting nearly half a million grus of credit annually into the local economy, close to ten times the state's own tax revenue from the city's silk-cloth press. Of the endowments in Murat Çizakça's full census, roughly 20 percent operated for over a century, and 81 percent of those long-lived waqfs had grown their capital base through reinvested profit or additional donations rather than merely preserving the original endowment.