Is a UK Home Purchase Plan Still a Partnership When the Price Falls? AAOIFI Clause 5/4 and the 70,950 Pounds That Changes Sides: A Sharia Analysis for Muslim Investors (2026)

Author: Zaid Alissa, CTO and Halal Finance Researcher | Published: September 2026 | Updated: September 2026

London house prices fell for eleven months in a row. The average London property cost 550,037 pounds in July 2026, which is 3.3 percent less than a year earlier. The UK average moved the other way and rose 1.4 percent to 273,000 pounds. Most British Muslims who buy with a home purchase plan, a UK Islamic home finance contract, never think about that gap. The gap matters on one day only: the day the house sells for less than the buyer paid.

That day is the subject of this article, and the marketing never covers it. A provider sells a diminishing musharaka as a partnership. Partners share losses. So the two owners sell the house at a loss. Does the bank take its share of that loss, as a partner does? Or does the bank take its money back first?

An earlier article on Islamic mortgages in the UK covers the structures, the providers and the rental benchmark debate. This article does not repeat any of that. This article covers the downside case, because the downside is where the word partnership gets tested.

What a Home Purchase Plan Does to the Title Deeds

Start with who owns what, because the fiqh answer follows the ownership.

HM Land Registry Practice Guide 69, last updated on 9 September 2019, gives three ways to register a diminishing musharaka. The registry transfers legal title to the bank, to the bank and the customer together, or to a third party trustee. The registered owner then holds the property on trust. The two sides split the beneficial interest, which is the right to the value of the property, in proportion to what each side paid. A Form A restriction on the register protects the growing share of the customer.

The lease to own version works differently. The bank owns the reversion, the customer holds a lease, and a notice on the register protects the promise to sell the reversion.

Gatehouse Bank states the formula plainly in its handbook for conveyancers. The bank divides its payment on completion by the purchase price and multiplies the result by one hundred. That result is the opening share of the bank. Each regular acquisition payment raises the share of the customer and lowers the share of the bank by the same amount.

Read the formula again and note what it uses. It uses the purchase price. It never uses the current value of the property.

The share of the customer grows against a fixed number set on the day of completion. The remaining share of the bank therefore stays measurable in original pounds. Nobody notices this in a rising market. In a falling market this is the whole argument.

The Property Question

A real co-ownership exists here, and this article states that before it criticises anything. The bank sits on the title. The register records the beneficial interest of the customer. Two parties own one asset. A conventional loan works differently, because there the borrower owns the house and the lender owns only a security interest.

British tax law treats the arrangement as real ownership. Section 71A of the Finance Act 2003 exempts the later transactions in an alternative property finance arrangement. The customer therefore pays stamp duty once instead of at every stage. The Finance Act 2005 inserted section 71A, and the Finance Acts 2006 and 2011 and the Scotland Act 2012 amended it. Gatehouse cites section 71A(3) for the rule that the second transaction is exempt if the first one complied. The customer pays on the first transfer from the seller to the bank, and the later stages are exempt.

On a 550,000 pound purchase at the current rates for England and Northern Ireland, that single charge is 17,500 pounds. Three bands produce it.

Nothing on the first 125,000 pounds.
2 percent on the 125,000 pounds up to 250,000 pounds, which is 2,500 pounds.
5 percent on the remaining 300,000 pounds, which is 15,000 pounds.

Add the three bands: 0 plus 2,500 plus 15,000 is 17,500 pounds. Without section 71A the same buyer pays a second charge when the share of the bank comes back. Parliament granted that relief because Parliament accepted that the bank really bought the house.

The ownership is therefore not a fiction. The open question is whether it carries the consequences of ownership.

The Riba Question

Riba means interest, or any guaranteed increase on the money one party puts in. AAOIFI Shari'ah Standard No. 12, Sharikah (Musharakah) and Modern Corporations, issued on 16 May 2002, governs this structure. Three of its clauses decide the question.

Clause 3/1/4/1 sets the rule for every partnership: "All partners in a Sharikah contract maintain the assets of the Sharikah on a trust basis. Therefore, no one is liable except in cases of misconduct, negligence or breach of contract. It is not permitted to stipulate that a partner in a Sharikah contract guarantees the capital of another partner."

Clause 5/4 applies that rule to the diminishing form: "The loss, if any, shall be borne periodically by the parties in accordance with the participation ratio of each partner as the equity stake of one partner decreases and the stake of the other partner increases."

Clause 5/7 closes the obvious way around it: "It is permissible for one of the partners to give a binding promise that entitles the other partner to acquire, on the basis of a sale contract, his equity share gradually, according to the market value or a price agreed at the time of acquisition. However, it is not permitted to stipulate that the equity share be acquired at their original or face value, as this would constitute a guarantee of the value of the equity shares of one partner (the Institution) by the other partner", which the standard states is prohibited.

Read clause 5/7 slowly. It does not call a purchase at face value weak or inferior. It calls a purchase at face value a capital guarantee, and it sends the prohibition straight back to clause 3/1/4/1.

The appendix to the standard repeats the point. A promise to buy partnership assets at face value "constitutes a guarantee of the capital", which the standard prohibits, and a promise to buy at market value "does not constitute a guarantee of capital". One partner cannot guarantee the capital of another, and an acquisition at face value is such a guarantee. An acquisition schedule written in original pounds is therefore the thing the clause names.

The same boundary separates a sukuk from a bond, as an earlier article on this site sets out. The AAOIFI screening framework applies that boundary to listed companies.

Where the Loss Actually Goes

Now put numbers on the question. Take a London flat at 550,000 pounds, close to the July 2026 London average of 550,037 pounds. The example assumes three things. The deposit is 10 percent. The share of the customer on the day of sale is 14 percent. The value falls by 15 percent.

A deposit of 10 percent is 0.10 times 550,000, which is 55,000 pounds. The bank pays the rest, 550,000 minus 55,000, which is 495,000 pounds. On the day of sale the customer holds 14 percent and the bank holds 86 percent, because 1 minus 0.14 is 0.86.

The outstanding payment of the bank at face value is 0.86 times 550,000, which is 473,000 pounds. The total payment of the customer at face value is 0.14 times 550,000, which is 77,000 pounds. A fall of 15 percent gives a sale value of 550,000 times 0.85, which is 467,500 pounds. The total loss is 550,000 minus 467,500, which is 82,500 pounds.

Clause 5/4 splits that loss by share. The bank bears 0.86 times 82,500, which is 70,950 pounds. The customer bears 0.14 times 82,500, which is 11,550 pounds. The two add back: 70,950 plus 11,550 is 82,500 pounds.

The sale proceeds divide the same way. The bank receives 0.86 times 467,500, which is 402,050 pounds, and 473,000 minus 402,050 is 70,950 pounds, the loss of the bank. The customer receives 0.14 times 467,500, which is 65,450 pounds, and 77,000 minus 65,450 is 11,550 pounds, the loss of the customer. Under clause 5/4 the customer walks away from a falling market with 65,450 pounds in hand.

A sale shortfall runs the arithmetic the other way. MCOB 13 of the FCA Handbook carries the title "Payment difficulties and repossessions: regulated mortgage contracts and home purchase plans", so home purchase plans sit in the title and not in a footnote. The chapter uses the term sale shortfall. It means proceeds of sale that are less than the amount due under the regulated mortgage contract or home purchase plan.

Four provisions govern what the firm does next. MCOB 13.6.1R tells the firm to obtain the best price reasonably payable, "taking account of factors such as market conditions as well as the continuing increase in the amount owed by the customer". MCOB 13.6.3R tells the firm to give the customer the shortfall amount after the sale, and to say that another company can pursue it. MCOB 13.6.4R gives the firm six years to notify an intention to recover, or five years under Scottish law. MCOB 13.6.5G states only that a firm is not obliged to recover it.

Treat the amount due as the outstanding payment of the bank at face value. The shortfall is then 473,000 minus 467,500, which is 5,500 pounds. The customer receives nothing and owes 5,500 pounds.

Compare the two outcomes. The customer moves from a receipt of 65,450 pounds to a debt of 5,500 pounds, a swing of 70,950 pounds. That is the exact figure clause 5/4 assigns to the bank.

The match is not an accident of these inputs. Write the share of the customer as s, the purchase price as P and the sale value as V. Under clause 5/4 the customer receives s times V. The shortfall is (1 minus s) times P, less V.

Add the two. The sum simplifies to (1 minus s) times (P minus V). That is the share of the loss clause 5/4 gives the bank, for every s, every P and every V. Whatever the bank does not bear, the customer bears, pound for pound.

State the limit of the finding. MCOB 13.6 does not create that liability. It is a conduct rule that governs how a firm behaves once a shortfall exists, and the contract creates the liability itself.

The rulebook does establish one thing. The regulator drafted it on the assumption that a customer with a home purchase plan can owe money after the sale. Gatehouse sets out the acquisition mechanics in detail in its published handbook and says nothing about who bears a loss. That silence is the finding.

The Gharar Question

Gharar means uncertainty severe enough to turn a contract into a gamble on an unknown outcome. A home purchase plan is not gharar in the classical sense. The buyer knows the price, the shares and the schedule, and the register records who owns what.

The uncertainty here is ordinary rather than classical. A buyer who signs a partnership document cannot tell what happens if the asset falls in value. The document gives the acquisition formula and stops there. Scholars can argue about whether that rises to a Shari'ah defect. Nobody can argue that it counts as full disclosure.

The Maysir Question

Maysir means gambling. Maysir does not arise here. Nobody stakes money on a contingent event to move value from one side to the other. A person who buys a house to live in makes a real transaction in a real asset. The objection in this article runs the opposite way to a gambling objection. One party sits outside the risk of the asset, and nobody manufactured any risk.

Property is a legitimate asset class for a Muslim, as the comparison of halal asset classes sets out. To test the rest of your portfolio against the same standard, use the stock screener for listed equities. The crypto screener applies the equivalent tests to digital assets.

Where Scholars Differ

Named authorities disagree here, and this article keeps both sides intact.

Darul Ifta Birmingham published a ruling on the Al Rayan Bank housing scheme on 8 November 2017, checked and approved by Mufti Mohammed Tosir Miah. The ruling names four approving scholars. They are Mufti Faraz Adam al-Mahmudi, Sheikh Dr Abdul Sattar Abu Ghuddah, Sheikh Nizam Muhammad Saleh Yaqoobi and Mufti Abdul Qadir Barkatulla. On their view, a Muslim can follow that approval and use the bank. The same ruling records the contrary opinion of Hafizurrahman Fatehmahomed of Darul Iftaa Netherlands, approved by Mufti Ebrahim Desai: "Combining these transactions in a single transaction is impermissible and combining them together by making each one of them a condition to the other is also impermissible." Darul Ifta Birmingham reached its own conclusion: avoid the scheme, although it is better than a conventional bank.

Akmal Ullah wrote in MuslimMatters on 26 August 2025 and set out the same risk objection. That article names the camps on the diminishing musharaka model itself. Dr Abdul Sattar Abu Ghuddah, Dr Nizam Yaqubi and the scholar the article calls Mufti Faraz Ahmed permit the model, and Dr al-Haddad opposes it.

The same article covers a second and different question: whether a conventional interest bearing mortgage is permissible at all. On that question the European Council for Fatwa and Research permits one owner occupied home, and the late Dr Yusuf al-Qaradawi supported that permission. Dr Salah al-Sawi of AMJA published a detailed rebuttal of it. These are two debates, not one, and the names do not carry from one to the other.

The permitting camp has a serious answer, and it comes from the same standard. Clause 3/1/4/2 provides that "It is permissible for a partner in a Sharikah contract to stipulate that another partner provides a personal guarantee or a mortgage to cover cases of misconduct, negligence or breach of contract." A customer who stops making acquisition payments breaches the contract. On that reading, recourse after a default is security for a breach, which the clause permits, and not a guarantee of capital at all.

The counter argument separates the two cases. A shortfall that follows a customer walking away is a breach, and clause 3/1/4/2 covers it. A shortfall that follows eleven months of falling London prices is neither misconduct nor negligence nor breach by anyone. Clause 3/1/4/1 states that no partner is liable for it. A contract that gives the bank the same recourse in both cases no longer separates them, and that separation is what the clause requires.

Qualified scholars hold both readings. This article does not settle the question.

What Remains Impermissible

Two more clauses of the same standard speak directly to features of the UK products, and neither one is ambiguous on its face.

Clause 5/3 states: "It is not permitted to stipulate that one partner should bear all the cost of insurance or maintenance on the ground that he will eventually own the subject matter of the partnership." Clause 5/9 adds that where one partner leases the share of the other, "each partner will remain responsible for the periodical maintenance of his share on a timely basis." Home purchase plans in the UK put the insurance and repair cost on the occupier, and the MuslimMatters analysis records the same point. The eventual ownership argument is the exact reasoning that clause 5/3 rejects by name.

The earlier post on these products reaches this subject through Standard No. 9 and records that Sharia boards in the UK generally accept the arrangement because the customer occupies the property. Both statements are true. Clause 5/3 says what it says, and the boards made a judgement against it rather than a reading of it. That distinction is worth keeping in view.

Clause 5/1 requires the promise to buy and the partnership to stay independent. The buying partner "is allowed to give only a promise to buy", that promise "should be independent of the partnership contract", and "It is not permitted that one contract be entered into as a condition for concluding the other." This is the point the Darul Iftaa Netherlands opinion makes. No UK provider offers the co-ownership on its own in its published documents, without the acquisition undertaking attached, and the objection therefore holds.

Surah Al-Baqarah 2:279 states the symmetry underneath all of this:

فَإِن لَّمۡ تَفۡعَلُواْ فَأۡذَنُواْ بِحَرۡبٖ مِّنَ ٱللَّهِ وَرَسُولِهِۦۖ وَإِن تُبۡتُمۡ فَلَكُمۡ رُءُوسُ أَمۡوَٰلِكُمۡ لَا تَظۡلِمُونَ وَلَا تُظۡلَمُونَ

"And if you do not, then be informed of a war [against you] from Allah and His Messenger. But if you repent, you may have your principal - [thus] you do no wrong, nor are you wronged." (Surah Al-Baqarah 2:279, Saheeh International)

The verse returns the principal of the creditor only after he gives up the increase, and it closes on a symmetry: neither party is wronged. One structure returns the principal of the financier in full out of an asset that fell in value. The occupier absorbs the entire fall. That asymmetry is what the closing words name.

Practical Guidance

Before you sign, ask the provider these four questions in writing, and keep the answers.

Ask who bears a loss on a sale below the finance amount, and ask where the documents say so. If the answer points to a clause that makes you liable for the full outstanding acquisition amount, you now know the real risk profile. If no clause covers it, ask for that answer in writing too.

Ask whether the provider calculates your acquisition payment on the original purchase price or on the current value. The honest answer is the original purchase price. Clause 5/7 is the reason the answer matters.

Ask who insures the property, who repairs it, and whose name goes on the policy. Clause 5/3 is the reason the answer matters.

Ask whether the co-ownership agreement depends on the acquisition undertaking. Clause 5/1 is the reason the answer matters.

Three further points go beyond the documents.

Your deposit is your loss buffer, and nothing else protects you. The size of the deposit is therefore a Shari'ah risk decision as much as a financial one.
Read the early settlement terms. Al Rayan Bank applies an early settlement premium to rental rates selected after 1 October 2025. A structure built on gradual acquisition has no good reason to penalise an early buyout.
The Financial Services Compensation Scheme protects deposits held with an Islamic bank in the UK. It does not protect the equity you build in a house. The guide to Islamic banking covers that distinction.

This article is educational analysis. It is not a fatwa, financial advice or an endorsement of any provider. Read the Shari'ah board certification of each provider and consult a qualified scholar before you commit.

Conclusion

A home purchase plan in the UK is a real co-ownership on the register and in the tax code. Parliament granted it relief from a second stamp duty charge because Parliament accepted that the bank really bought the house.

No UK provider demonstrates in its published documents that this ownership carries the downside of ownership. Clause 5/4 of AAOIFI Standard No. 12 states that the parties bear the loss in proportion to their shares. Clause 5/7 states that an acquisition fixed at original value is a capital guarantee, and clause 3/1/4/1 prohibits it.

The FCA rulebook runs on the assumption that a customer with a home purchase plan can owe money after the house is gone. In the worked example above the difference between the two worlds is 70,950 pounds. That is the exact amount clause 5/4 assigns to the bank.

Eleven months of falling London prices is not a crisis. It is a reminder that markets move both ways, and that a partnership tested only on the way up is not tested. Ask the shortfall question before you sign, not afterwards.

Frequently Asked Questions

1. If my home purchase plan property sells for less than the share of the bank, do I still owe the bank money?

The FCA rulebook allows for that outcome. MCOB 13.6 defines a sale shortfall. It is proceeds of sale that are less than the amount due under a regulated mortgage contract or home purchase plan. It gives the firm six years to notify an intention to recover the shortfall, or five years under Scottish law. Whether your own provider pursues you depends on your contract, because MCOB 13.6.5G states that a firm is not required to recover a shortfall. Ask your provider in writing and get the clause reference.

2. Does AAOIFI require the bank to share the loss?

Clause 5/4 of Shari'ah Standard No. 12 states that the parties bear the loss in accordance with the participation ratio of each partner. The ratio adjusts as the shares change. That is one sentence and it is unambiguous on its face. The contested part is whether recourse after a customer default falls under that clause or under clause 3/1/4/2. Clause 3/1/4/2 permits security against a breach of contract.

3. Why does it matter that the provider calculates my payments on the purchase price?

Clause 5/7 states that acquiring the equity share of a partner at original or face value guarantees the capital of that partner. Clause 3/1/4/1 prohibits one partner from guaranteeing the capital of another. An acquisition schedule written in original pounds does not move when the property falls in value. That fixed quality is what a guarantee means in practice.

4. Do I pay stamp duty twice on an Islamic mortgage?

No. Section 71A of the Finance Act 2003 exempts the later transactions in the arrangement, so the charge falls once, on the first purchase. On a 550,000 pound property at the current rates for England and Northern Ireland that charge is 17,500 pounds. First time buyers pay nothing up to 300,000 pounds and 5 percent from 300,001 to 500,000 pounds, and no relief applies above 500,000 pounds.

5. Who legally owns the property during a diminishing musharaka?

HM Land Registry Practice Guide 69 gives three options. The registry transfers legal title to the bank, to both parties together, or to a third party trustee. The registered owner holds the property on trust, and the beneficial interest splits according to what each side paid. A Form A restriction protects your share on the register, and your share grows with each acquisition payment.

6. Is a home purchase plan still better than a conventional mortgage?

The scholars who examined the UK products disagree, and the disagreement is documented rather than theoretical. Darul Ifta Birmingham concluded in November 2017 that a Muslim does better to avoid the Al Rayan scheme, although the scheme beats a conventional bank. The same ruling lists four senior scholars who approve it. That is the honest state of the question, and no article settles it for you.

7. What single question do I ask a provider?

Ask who bears the loss if the property sells for less than the outstanding finance amount, and ask them to point to the clause. Every other question in this article follows from that answer. A provider that cannot answer it in writing tells you something important.