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The most famous rule in Islamic finance is the ban on usury. In economic terms, this means lender and borrowers are forbidden from charging or paying interest or riba. Sharia-compliant banks don’t issue interest-based loans. — So here is the loop hole:
The obvious question then becomes: how do Islamic banks make money? Instead of lending money to their clients at a profit, they buy the underlying product—the house, the car, the refrigerator—and then lease it or re-sell it on installment to the client for a fixed price typically higher than the initial market value. The key notion here is risk sharing—the banks make a profit on the transaction as a reward for the risk they took with the customer. Instead of thriving off of interest rates, Islamic banks use their customers’ money to acquire assets such as property or businesses and profit when the loan is successfully repaid. —Either way the lender extracts the profits from the borrower without calling it usury, it is the same deal in the end.