Musharakah Mutanaqisah

Musharakah mutanaqisah (Arabic for "diminishing partnership") is an Islamic finance structure in which a financier and a customer jointly buy and co-own an asset, most often a home. The customer uses the whole asset, pays rent to the financier for the portion the financier owns, and buys that portion back in installments until the customer owns the asset outright and the partnership ends.

It is one of the main alternatives to a conventional mortgage in Islamic banking. Instead of lending money at interest, which would be riba, the bank earns rent on an asset it genuinely part-owns, and the customer's equity increases with each purchase of the bank's units.

The structure combines three elements, each of which must be documented separately so that one contract is not made a condition of another in a way that Sharia scholars would reject:

1. Partnership in ownership. The bank and the customer buy the asset together, each contributing part of the price. This is a co-ownership form of musharakah. The bank's share is divided into units.
2. Lease. The bank leases its share to the customer under an ijarah contract, and the customer pays rent for using it. As the bank's share shrinks, so does the rent.
3. Promise to purchase. The customer gives a unilateral promise (wa'd) to buy the bank's units over an agreed schedule.

Each monthly payment therefore has two parts: rent on the bank's remaining share, and the price of one or more units. Classical scholars and modern standard-setters, including AAOIFI, have debated the pricing of those units. Some hold that units should be sold at market value at the time of each sale, while others permit a price agreed at the outset; practice varies by institution and jurisdiction.

A customer wants a house costing 300,000 and contributes 60,000. The bank contributes 240,000, divided into 240 units of 1,000 each. In the first month the customer pays rent on the bank's 80 percent share plus the price of one unit. Once one unit has been bought, the bank owns 239 units and the next month's rent is calculated on that smaller share. After all 240 units have been purchased, the customer owns 100 percent of the house. If rent were 1,200 per month at the start, it would fall steadily over the term as the bank's stake fell.

Diminishing partnership is widely used for home financing in Malaysia, Pakistan, the Gulf states and the United Kingdom, and also for vehicles, equipment and business property. In the UK, tax rules were changed in the early 2000s so that such "alternative property finance" is not charged property transfer tax twice merely because ownership passes in stages. Similar issues of tax neutrality arise in other countries that host Islamic home finance.

Because the bank is a genuine co-owner, Sharia standards expect it to bear the risks that come with ownership, such as major structural maintenance and insurance of its share, which is often arranged through takaful. The customer usually bears day-to-day maintenance as the user. If the property is destroyed or its value falls, the loss should be shared according to ownership, though contract terms and practice vary. If the customer defaults, the bank may sell the property, and proceeds are divided according to each party's share at that time.

Critics argue that the payment schedule often mirrors a conventional amortizing mortgage, and that rent is frequently benchmarked to interest-rate indices, making the product economically similar to an interest-bearing loan. Supporters reply that the legal relationship is different: the bank owns real property, earns rent rather than interest, and shares ownership risk. Weaknesses in how the separate contracts are linked can create Sharia non-compliance risk, which the bank's Sharia supervisory board is expected to manage. The structure is distinct from a simple murabaha, in which the bank sells the whole asset at a fixed marked-up price, and from mudarabah, in which only one party supplies capital.