فِقهُ البَيعِ بِالاستِصنَاع — عُقُودُ تَصنِيعِ البَضَائِعِ بِالتَّكلِيفِ فِي الفِقهِ الإِسلَامِيّ: عَقدُ الاستِصنَاعِ [حَيثُ يُكَلِّفُ المُشتَرِي الصَّانِعَ بِإِنتَاجِ سِلعَةٍ مُحَدَّدَةٍ لَم تُوجَد بَعد]، وَاختِلَافُهُ عَن بَيعِ السَّلَمِ [البَيعِ الآجِل] وَإِجَارَةِ العَمَلِ، وَتَطبِيقَاتُهُ المُعَاصِرَةُ فِي تَمِويلِ البِنَاء
Fiqh al-Bay' al-Istisna' (فِقهُ البَيعِ بِالاستِصنَاع — Jurisprudence of the Commissioned Manufacture Contract; *istisna'*: from *s-n-a*: to make, to manufacture; istisna' = asking/commissioning someone to manufacture something; the istisna' contract: a contract in which one party [the mustasni' — the buyer/commissioner] asks another party [the sani' — the manufacturer] to produce a specified good according to agreed specifications, for delivery at a future date, for an agreed price; examples: commissioning a tailor to sew a garment; commissioning a carpenter to build furniture; commissioning a contractor to build a house; the classical jurisprudential controversy about istisna': Hanafi school position: istisna' is a valid contract but it is technically an exception to normal sale rules because: [1] the subject matter does not exist at contract formation [normally a requirement for a valid sale]; [2] the price can sometimes be deferred [normally deferred price + deferred delivery = gharar]; the Hanafi permissibility rests on 'urf [custom] — because people have always commissioned manufacture, it is permitted by necessity; Shafi'i and some Hanbali position: istisna' is a subset of ijarah al-'amal [labor hire], not an independent contract; Maliki position: similar to Shafi'i; the AAOIFI and modern Hanafi synthesis: Islamic finance regulatory body AAOIFI [Accounting and Auditing Organization for Islamic Financial Institutions] adopted the Hanafi position and defined istisna' as an independent valid contract; this has become the standard position in Islamic banking; how istisna' differs from bay' al-salam [forward sale]: [1] in bay' al-salam [forward sale], the goods must be fungible [interchangeable] and the price must be paid in full at contract formation; [2] in istisna', the goods are customized [non-fungible] and the price can be paid in installments during manufacture or upon delivery; [3] in bay' al-salam, the seller must deliver on time or refund — not a specific seller's product; in istisna', the specific manufacturer's craftsmanship is part of the contract; how istisna' differs from ijarah al-'amal [labor hire]: in ijarah al-'amal, the contractor is providing labor on the buyer's materials; in istisna', the manufacturer provides both labor AND materials; the manufacturing entity is more integral; modern applications of istisna' in Islamic finance: [1] residential construction finance: a bank commissions a developer to build a house for a customer; the bank pays the developer in stages; the customer buys the house from the bank on deferred payment [parallel istisna']; [2] aircraft finance: Islamic banks have used istisna' to finance Boeing and Airbus orders for airlines; [3] infrastructure: government sukuk issued for infrastructure often use istisna' structures; [4] shipbuilding: large vessel commissions; the parallel istisna' structure: Islamic banks often use a two-contract structure: [a] the bank enters an istisna' with the customer [promising to deliver the completed asset]; [b] the bank enters a second istisna' with the actual manufacturer/contractor; this structure allows the bank to act as an intermediary; AAOIFI Standard 11 on istisna' governs the requirements in Islamic banking; key requirement: the delivered asset must conform to specifications; if it doesn't, the commissioner can refuse delivery; contractor liability: the contractor is responsible for defects in workmanship) is Islamic law's commissioned-manufacture financing structure.
Commissioning What Does Not Yet Exist
Classical Islamic contract law faces an apparent puzzle with commissioned manufacture. Ordinarily, a sale requires that the subject matter exist at the time of contract. But if you commission a tailor to sew a garment, or a carpenter to build furniture, the thing you are buying does not yet exist when you make the agreement. How can there be a valid sale?
The Hanafi school resolved this through the concept of ‘urf (custom): because people have always commissioned manufacture, and because commerce depends on this practice, the istisna’ (commissioned manufacture) contract is valid by necessity — custom has established it as a permitted exception. The Shafi’i school, with characteristic precision, classified it differently: not an independent contract but a form of ijarah al-‘amal (labor hire), with the manufacturer hired to produce rather than a seller selling what they make.
How Istisna’ Differs From Salam
The Hanafi distinction between istisna’ and bay’ al-salam (forward sale) is practically significant. In a salam contract, the buyer pays the full price upfront for goods delivered later — and those goods must be fungible (interchangeable, like wheat or gold). In an istisna’ contract, the goods are customized (a specific house, a specific aircraft), the price can be paid in installments during manufacture, and the contract is specifically with the manufacturer whose craftsmanship matters.
This distinction has shaped Islamic finance’s application of both contracts: salam is used for agricultural commodity finance; istisna’ is used for real estate, construction, and large-scale manufacturing finance.
Modern Applications
The istisna’ structure is among Islamic finance’s most commercially significant contracts. A bank that wants to help a customer buy a house can enter an istisna’ with a developer (commissioning the house’s construction) and a parallel istisna’ with the customer (selling the completed house on deferred payment). Aircraft orders, shipbuilding, and infrastructure sukuk have all used istisna’ structures that allow Islamic banks to participate in large commissioned projects without holding conventional loans.
See also: Fiqh Al Buyu, Fiqh Al Gharar, Fiqh Al Ijarah Al Amal, Fiqh Al Bay Al Murabahah, Fiqh Al Ijtihad Wal Taqlid