The Three Structures

The conventional mortgage — for reference

To see why the three Islamic structures try to be different, look at the conventional mortgage first.

The bank lends money. The customer buys the house. The customer repays the loan plus interest. The bank never owns the house at any point — only the lien on it.

Where the riba lives: the interest payment. The bank charges compensation for the time-value of money, not for any economic activity, risk, or service. The Qurʾān 2:275 — “God has permitted trade and forbidden riba” — is given precisely as the response to those who said “trade is just like riba.”

The three Islamic structures all attempt to replace this with a return that traces to real economic activity (a sale, a lease, a partnership). Whether they actually do depends on the contract.

Structure 1 — Murābaḥah · cost-plus sale

The most widespread Islamic finance product globally — and the most criticized.

How it should work (the ideal)

The financier purchases the asset from the seller for its market price. The financier then sells the asset to the customer at a marked-up price — payable in installments over time. The markup is the financier's return; it is justified by the fact that the financier briefly owned the asset and bore the risk of that ownership.

Classical Murābaḥah was a routine trader-to-trader contract in the pre-modern Muslim world — a goldsmith would Murābaḥah inventory to a smaller jeweller, retain ownership during the transit period, and bear the risks of that period.

This is also the structure behind a halal car purchase, not just a house: a genuine Murābaḥah on a vehicle means the financier actually buys the car, owns it (and its risk) for a real moment, then sells it to you at a disclosed markup over instalments. A conventional car loan — or a dealer "finance" rate — skips that ownership and simply charges for time, which is the same riba as a conventional mortgage in miniature. The test below applies identically whether the asset is a home or a car. (Full car-finance deep dive →)

How it actually works (the contemporary critique)

Modern bank Murābaḥah typically holds the asset for seconds — sometimes in pure legal fiction, with two contracts executed in the same office in the same minute. The financier bears no real ownership risk. The markup is calibrated to interest-rate benchmarks (LIBOR, the local bank rate, etc.). The default mechanism penalizes time-value of money. The customer experience is identical to a conventional mortgage.

Structure 2 — Ijārah · lease ending in ownership

Structurally cleaner than Murābaḥah. The risk of ownership is harder to engineer away.

How it should work

The financier purchases the asset outright and owns it for the duration of the contract. The customer occupies the asset and pays rent for the use of it — rent is compensation for use of a productive asset, which is permissible (every classical madhab affirms it). At the end of the lease term, ownership transfers to the customer. This full form is called Ijārah Muntahiyah bi-Tamlīk (IMBT) — “a lease ending in ownership.”

The critical question

The structure stays clean if and only if three things hold:

1. Rent is calibrated to the rental market, not to interest rates. A real lessor sets rent based on what the property could earn on the rental market — not what the financier would have earned in interest.
2. The financier bears structural maintenance and depreciation risk. A real owner is responsible for the roof, the foundation, the plumbing failure. If the customer is contractually responsible for everything from day one, the financier is not really an owner.
3. Default does not trigger loan-style acceleration. A real lease, on customer default, ends the lease — the financier recovers the asset and any unpaid rent, and the customer's accumulated equity-buy-back amounts are returned (less any actual lessor losses). A disguised loan accelerates the full remaining "rent" as a debt.

Structure 3 — Mushārakah · partnership

The closest modern echo of the Prophetic ﷺ commercial model. Risk genuinely shared.

Diminishing Mushārakah — the contemporary home-finance form

The financier and the customer jointly purchase the asset — say 80/20 ownership. While the financier holds its share, the customer pays rent on that share (for the use of it). Each month, in addition to rent, the customer buys a portion of the financier's share. The rent decreases proportionally as the customer's share grows. At the end, the customer owns 100%.

This is Mushārakah Mutanāqiṣah Muntahiyah bi-Tamlīk — diminishing partnership ending in ownership — and it is the structure Hejaz Australia, Guidance Residential (US), and Al Rayan / Gatehouse (UK) all market.

Classical Mushārakah — the original

For comparison: the classical Mushārakah was a real business partnership. Two parties contribute capital (and possibly labour) to a joint venture, share profits per agreed ratio, and share losses in proportion to their capital contributions. There is no fixed return; returns track the actual economic outcomes of the venture.

Where Diminishing Mushārakah becomes ḥaram

The contemporary form preserves the shape of Mushārakah while engineering its substance toward a fixed-return loan. Five red flags:

1. Rent calibration to interest rates. A real partner's compensation tracks the value of what they own, not what they would have earned in a debt market.
2. Customer alone bears loss if the property's market value falls. A real partner shares loss in proportion to capital. If the customer is contractually obligated to make the financier whole regardless of the asset's actual worth, the partnership is fictional.
3. Customer bears all maintenance and risk during the partnership. A real partner contributes its share of upkeep.
4. The "promise to purchase" the financier's share is binding from day one. The classical view: a binding pre-commitment to buy partnership shares at predetermined prices makes the partnership functionally a debt contract.
5. Default mechanics that crystallize the full balance. A real partner's exit is at then-current asset value; a disguised loan demands the full nominal repayment.

When a partnership's return is fixed in advance and the customer is made whole regardless of outcome, the relationship quietly stops being a partnership and becomes a loan. The diagram below shows why that crossing matters — it is the moment reward is kept while the matching risk is shed.

The full comparison

How each structure measures against the conventional mortgage across the structural properties that determine permissibility:

The bottom row is the one that matters most. In principle, the three Islamic structures are clean. As commonly implemented in Australia, the UK, the US, and Europe — only the structurally cleanest (Ijārah) reliably passes; the others are contested or actively rejected by most independent scholars.

The international landscape

Where each structure is actually offered.

Implementation quality varies dramatically by jurisdiction. The same structure can be clean in one country and ḥiyal-risk in another, depending on the specific provider's contract terms, the local shariah-board composition, and regulatory pressure to keep the economic outcome identical to a conventional mortgage.

United States

MurābaḥahḤiyal-risk implementationLARIBA (declining); University Islamic Financial (limited)

IjārahContested implementationGuidance Residential (large), University Bank, Ijara Loans

MushārakahContested implementationGuidance Residential markets Mushārakah Mutanāqiṣah; debated by US scholars

United Kingdom

MurābaḥahḤiyal-risk implementationAl Rayan Bank (renamed from IBB); Gatehouse Bank

IjārahContested implementationAl Rayan Home Purchase Plan (Ijārah + Mushārakah hybrid)

MushārakahContested implementationGatehouse Bank; StrideUp (newer)

European Union

MurābaḥahNot commonly offeredLimited; mostly via Türkiye/UAE bank subsidiaries

IjārahNot commonly offeredLimited

MushārakahNot commonly offeredLimited; KT Bank (Germany) operates Murābaḥah

Australia

MurābaḥahḤiyal-risk implementationMCCA (since 1989); ICFAL

IjārahContested implementationAmanah Islamic Finance; MCCA Ijārah variant

MushārakahContested implementationHejaz Diminishing Mushārakah (largest by marketing)

Generally cleanContested implementationḤiyal-risk implementationNot commonly offered

What a perfect implementation would look like

If a Western Islamic home-finance product were genuinely compliant, the contract would have all of the following:

For Murābaḥah

1. The financier holds the property for a documented period — minimum hours, ideally days — during which they bear the risk of damage, theft, defects, and adverse market movement.
2. The markup is set as a sale margin, with reference to the property type and market — not indexed to any interest benchmark.
3. Late payments are channelled to a designated charity rather than to the financier's revenue.
4. Default triggers a renegotiation or asset return — not loan-style acceleration of the full markup.

For Ijārah

1. Monthly statements separately itemize rent (decreasing as the financier's share shrinks) and equity buy-back.
2. The financier is contractually responsible for structural maintenance — roof, plumbing, foundation, major systems — and bears insurance cost.
3. Rent is calibrated to the rental market with documented comparables.
4. Default ends the lease and returns the asset, with the customer's equity-buy-back portion returned less actual lessor losses.

For Diminishing Mushārakah

1. The sale price of the financier's share at any future point is the then-current market value — not a pre-fixed price.
2. Losses from market depreciation are shared in proportion to ownership.
3. Maintenance obligations are proportional to ownership share.
4. The promise to purchase the financier's share is non-binding at execution and reset to market value each transaction.

What this section is asking you to take away

Three things:

1. The structure type alone tells you nothing. A Murābaḥah can be cleaner than a Mushārakah depending on the actual contract. Marketing labels are not verdicts.
2. The contract is the verdict. Every conclusion about permissibility traces to specific contract clauses — rent calibration, maintenance allocation, default mechanism, sale price predetermination.
3. In every Western jurisdiction surveyed, the dominant implementations of all three structures are contested. This is not pessimism — it is what the structural audit reveals. A buyer in Sydney, London, or Houston who reads only the marketing is making a decision the contract does not actually support.

The next section, The Honest Audit, applies these criteria to each provider in turn — market by market.