Money Under Islamic Law

A mortgage can look like a mortgage without legally being a loan. A bond can pay investors on a schedule without being called a bond. A bank can finance the purchase of a house without saying that it has lent the customer money at interest. A credit card can exist without the issuer simply charging conventional revolving interest. An insurance pool can cover losses while being organized around mutual contribution rather than the sale of risk.

This is the world of Islamic finance. From a distance, it can look like a vocabulary exercise: replace “interest” with “profit,” replace “bond” with sukuk, replace “insurance” with takaful, and declare the product Sharia-compliant. That is the least interesting and often the least accurate, way to understand it.

The more useful question is what happens to finance when the law cares intensely about the legal and economic character of a transaction.

Islamic commercial law, usually discussed under the broader field of fiqh al-mu'amalat, does not begin with the premise that profit is wrong. Trade is expressly permitted in the Qur’an. Ownership matters. Leasing matters. Partnership matters. Risk matters. Contractual certainty matters. So do justice, disclosure and the avoidance of certain forms of exploitation. What Islamic law rejects is not commerce but particular ways of structuring commerce, most famously riba, a term whose modern application is commonly associated with interest, but whose classical jurisprudence is broader and more technical than the slogan “interest is haram.”

The foundational contrast appears in Qur’an 2:275: trade is permitted and riba is forbidden. That single distinction creates an enormous body of financial engineering. If a bank cannot simply say, “Here is $500,000; return $650,000 over 20 years because I lent you money,” what can it do instead? Can it buy an asset and resell it? Lease it? Enter a partnership? Finance production before delivery? Purchase something for deferred payment and then monetize it? Can a return that looks economically similar to interest still be permissible because the legal relationship is genuinely different?

Those questions are why Islamic finance deserves to be studied as a financial system rather than as a religious curiosity.

As of 2024, the Islamic Financial Services Board estimated the global Islamic financial services industry at US$3.88 trillion in assets, with Islamic banking accounting for more than 70% of the total. The same report recorded particularly strong growth in sukuk and Islamic insurance. The industry is no longer a niche experiment. It is a large, institutionalized part of the financial system, supported by banks, capital markets, central banks, standard setters, Sharia supervisory boards, lawyers, auditors and regulators.

Yet it is not one uniform system.

AAOIFI, the Accounting and Auditing Organization for Islamic Financial Institutions, publishes widely used Sharia standards covering financial contracts and products. The Islamic Financial Services Board publishes prudential and supervisory standards. Malaysia operates a national Sharia Advisory Council at Bank Negara Malaysia whose role is embedded in statute. Other jurisdictions organize Sharia governance differently. Individual scholars and institutions can disagree. A structure accepted in one market may be controversial in another.

That disagreement is not a defect to be edited out. It is part of the story.

The ten articles in this series examine Islamic finance as a living legal and commercial architecture: what it prohibits, what it permits, how its contracts work, where the industry has compromised, where scholars disagree, and what happens when centuries-old jurisprudence collides with credit cards, benchmark rates, securitization, tokenized assets and stablecoins.

The central question of the series

Every article asks a version of the same question:

If money has to move, capital has to earn a return, businesses have to borrow, homes have to be financed and risk has to be managed, how do you build a financial system without treating a conventional interest-bearing loan as the default building block?

That question has produced some elegant answers, some complicated answers, and some arrangements that critics argue reproduce conventional finance while changing its contractual clothing.

The series does not assume that every product marketed as “Islamic” perfectly expresses an ideal of Islamic economics. Nor does it assume the opposite, that similar cash flows prove the contracts are meaningless. In law, the form of an agreement often changes rights, ownership, recourse and risk. But form without substance can also become legal arbitrage. Islamic finance lives inside that tension.

The 10 articles in the series

#	Article	Central question	Primary SEO key phrase
1	*Why Islam Forbids Riba* — and Why “Interest Is Haram” Is Only the Beginning**	What exactly is riba, and why is the modern interest debate more complicated than one slogan?	riba in Islamic finance
2	Murabaha, Tawarruq and the Great Workaround: How Islamic Banks Create Credit Without a Conventional Loan	How can a bank create financing through trade, and when does the structure become controversial?	murabaha and tawarruq
3	Mudarabah and Musharakah: What Profit-and-Loss Sharing Really Means	What would banking look like if capital and entrepreneurship genuinely shared risk?	mudarabah and musharakah
4	Sukuk: The Islamic Bond That Is Not Supposed to Be a Bond	How can capital markets create fixed-looking cash flows without simply issuing interest-bearing debt?	sukuk Islamic bonds
5	Who Decides What Is Sharia-Compliant? Inside the Scholars, Boards and Rulebooks of Islamic Finance	Who has authority when scholars, banks and jurisdictions disagree?	Sharia boards Islamic finance
6	Before SWIFT: Hawala, Credit Transfers and the Payment Networks of the Muslim Commercial World	How did merchants move value across dangerous distances before modern banking rails?	hawala history
7	Gharar, Maysir and Takaful: Why Uncertainty Can Make a Financial Contract Unlawful	Why can excessive uncertainty or wagering change the status of a contract, and how does Islamic insurance respond?	gharar maysir takaful
8	The Islamic Wallet: Mortgages, Credit Cards, Deposits and BNPL Without Interest	What do Sharia principles look like inside ordinary consumer financial products?	Islamic mortgages and credit cards
9	Debt, Mercy and Qard Hasan: The Social Architecture of Islamic Credit	What does Islamic law expect when a debtor is in hardship, and where do charity and credit meet?	qard hasan Islamic finance
10	The US$3.88 Trillion Question: Stablecoins, Tokenization and What Islamic Finance Becomes Next	Can Islamic finance move from recreating conventional products to designing genuinely different digital money and markets?	Islamic finance stablecoins

Article 1: Start with riba, but do not stop at “interest”

Any serious introduction to Islamic finance starts with riba. It should not end there.

The Qur’an condemns riba in unusually strong language. Verses 2:275–279 distinguish trade from riba and instruct believers to abandon what remains of it. Classical jurisprudence then develops the subject through the Prophetic traditions, including rules governing exchanges of certain commodities such as gold, silver, wheat, barley, dates and salt.

That means riba is not simply a synonym that can be mechanically replaced by the English word “interest.” Modern scholars overwhelmingly treat conventional loan interest as falling within the prohibition, but the classical category also includes exchange rules that do not map neatly onto a modern bank loan.

Article 1 therefore begins with the source material and then asks the contemporary question: why has the modern Islamic-finance industry largely treated interest-bearing debt as impermissible, and what arguments have scholars made about context, exploitation and the definition of riba?

The point is to give the reader a foundation sturdy enough for everything that follows.

Article 2: The bank stops lending and starts buying

If a conventional loan cannot simply be relabeled, one of the most important alternatives is murabaha: a sale in which the seller discloses cost and an agreed profit margin.

In modern banking, a customer may identify an asset, the bank buys it, and the bank then sells it to the customer at a marked-up deferred price. The cash flow can resemble a conventional loan. The legal structure is different: the bank has entered a sale and, at least for part of the transaction, assumed ownership-related risk.

Then comes tawarruq. A customer purchases a commodity on deferred terms and sells it to a third party for immediate cash. Economically, the customer has obtained liquidity now and owes a larger amount later.

This is where the series deliberately enters controversy. AAOIFI standards impose controls on tawarruq. Malaysia permits regulated applications of it. The International Islamic Fiqh Academy has distinguished between classical individual tawarruq and organized structures, rejecting some organized forms as a device that produces cash now for greater debt later.

This is not a footnote. It shows why “Sharia-compliant” cannot always be treated as one global binary.

Article 3: The ideal of shared risk

The contracts most closely associated with the classical risk-sharing ideal are mudarabah and musharakah.

In mudarabah, one side typically supplies capital while the other manages the enterprise. Profit is shared according to an agreed ratio; financial loss of capital generally falls on the capital provider unless the manager is at fault through misconduct, negligence or breach.

Musharakah is partnership: parties contribute capital and share economic participation according to the contractual framework. A modern variant, musharakah mutanaqisah, diminishing partnership is frequently used in home finance, where one party gradually acquires the other party’s share.

These structures sound closer to venture capital and private equity than to conventional lending. Yet modern Islamic banks often rely more heavily on sale-based and lease-based financing than on pure profit-and-loss sharing. That gap between theoretical ideal and institutional reality is one of the most important questions in the industry.

Article 4: A bond without interest?

Governments and corporations need capital markets. Conventional bonds are fundamentally debt instruments: investors advance money, the issuer owes principal and ordinarily pays interest.

Sukuk solve the problem through a different legal architecture. Depending on the structure, certificates may represent interests in assets, usufructs, services, investments or ventures. Cash distributions arise from the underlying structure rather than simply being described as interest on a loan.

The phrase “Islamic bond” is convenient and potentially misleading. Some sukuk behave economically much like fixed-income instruments. Others expose investors to different forms of asset and enterprise risk. Tradability can also depend on what the certificates actually represent.

The subject is particularly timely because AAOIFI has been revisiting its Sharia standard on sukuk. As of October 1, 2026, AAOIFI’s website still lists the revised “Sukuk” standard as an exposure draft rather than a finalized replacement. That ongoing debate exposes a central fault line: how far can the market make sukuk behave like conventional bonds before the underlying Sharia logic becomes too thin?

Article 5: Who gets to say yes?

Islamic finance has no single global supreme court.

AAOIFI standards are influential but are not automatically law everywhere. The IFSB issues supervisory principles. Individual institutions maintain Sharia boards or advisers. National regulators can impose their own architecture. Malaysia goes further than many markets: Bank Negara Malaysia’s Sharia Advisory Council is the country’s highest Sharia authority for Islamic finance, and Malaysian law gives its rulings a formal role in relevant court and arbitration proceedings.

Other jurisdictions use different models.

The result is a governance problem as much as a theological one. Who appoints the scholars? Who pays them? Can one scholar sit on dozens of boards? What happens when two institutions need a transaction but their boards disagree? How are conflicts of interest managed? What happens when a product is approved in Malaysia but disputed by scholars elsewhere?

In 2025, the IFSB adopted IFSB-31 on effective supervision of Sharia governance, explicitly recognizing that legal and institutional frameworks differ across jurisdictions. Article 5 explains the machinery behind the “Sharia-compliant” label.

Article 6: Payments before payment rails

Long-distance trade has always had a simple physical problem: money is heavy, valuable and stealable.

Merchants therefore developed ways to settle obligations without physically carrying the full value from one end of a trade route to another. Historical scholarship discusses instruments and networks including hawala, suftaja and other credit-transfer arrangements across the Muslim commercial world and neighboring regions.

Modern hawala is often discussed almost exclusively through the lens of anti-money-laundering regulation. That obscures the underlying payment logic. At its simplest, value can be delivered in one location because corresponding obligations are settled through a network of brokers rather than by shipping the same banknotes across the border.

The IMF notes that informal funds-transfer systems grew partly from the need to facilitate distant trade where formal banking was absent or weak, while also warning that the precise historical antecedents of Middle Eastern hawala are not completely documented. Article 6 will keep both facts in view: the sophistication of early value-transfer networks and the danger of turning history into a neat origin myth.

Article 7: Risk is not the problem; selling certain kinds of uncertainty can be

Islamic finance is frequently summarized as “no interest,” but gharar and maysir are just as important to understanding why some contracts are structured differently.

Gharar broadly concerns excessive uncertainty or ambiguity in contractual exchange. Maysir concerns gambling or games of chance. Neither rule means business must be risk-free. Entrepreneurship is risky. Asset prices move. Ships sink. Harvests fail. The distinction is between ordinary commercial risk and contractual structures in which uncertainty, speculation or wagering becomes the prohibited feature.

This is one reason conventional insurance has been controversial in Islamic jurisprudence. Takaful offers an alternative architecture based on mutual contribution and shared support. Participants contribute to a risk pool; the arrangement is designed around cooperation rather than simply a bilateral sale of risk from policyholder to insurer.

The result is not merely “Islamic insurance.” It is a useful case study in how changing the legal theory of a transaction changes governance, ownership of funds and treatment of surplus.

Article 8: What happens at the checkout screen

The philosophical principles of Islamic finance become real when someone wants to buy a house, carry a credit card, finance a car or split a purchase into four installments.

Islamic home finance may use murabaha, ijarah or diminishing musharakah. Islamic cards may be structured around fees, ujrah, tawarruq or other contractual arrangements depending on jurisdiction. Deposits can create questions about whether the customer is lending money to the bank or investing through a profit-sharing pool. Buy-now-pay-later products create their own issues around deferred prices, late charges and the relationship between seller, financier and consumer.

This is not frozen doctrine. In July 2026, Bank Negara Malaysia’s Sharia Advisory Council issued a new statement addressing cash-advance fees, annual fees and implementation issues in ujrah-based and tawarruq-based Credit Card-i products.

Article 8 shows Islamic finance where ordinary people actually touch it.

Article 9: A financial system also has obligations to the debtor

Commercial Islamic finance can become highly technical. The social side is easier to miss.

The Qur’an tells creditors to grant time to a debtor in genuine difficulty and describes remission of debt as better still. It includes people burdened by debt among the recognized categories of zakat recipients. Qard hasan—a benevolent loan without a stipulated return—sits at the boundary between credit and social support. Islamic social-finance institutions also include zakat, sadaqah and waqf.

This matters because Islamic finance is not only a set of engineering techniques for replacing interest-bearing products. It also contains a theory about what creditors, debtors, owners and communities owe one another.

Article 9 asks the question that the commercial industry sometimes finds uncomfortable: if an Islamic financial product is technically valid but reproduces every pressure of conventional indebtedness, has the system achieved everything it claims to be for?

Article 10: Digital money forces the old categories to reveal themselves

Stablecoins, tokenized deposits, digital assets and programmable settlement do not erase Islamic commercial law. They make its classification questions harder.

Is a stablecoin money, a debt claim, a digital representation of an asset or something else? Does a reserve structure matter? Can a token representing an interest in real assets be traded freely if part of the pool consists of receivables? Can decentralized protocols satisfy the requirements of ownership and possession? What is the Sharia status of yield generated through staking, lending or liquidity provision? How do Islamic banks operate when the rails become instant and programmable?

The industry is already moving into this territory. In July 2026, AAOIFI announced that its Governance and Ethics Board had approved in principle exposure drafts concerning digital Islamic banks and the conversion of conventional institutions into Islamic financial institutions.

The capstone will also confront the strongest criticism of modern Islamic finance: that too much of the industry has become a sophisticated exercise in reproducing conventional economic outcomes through compliant contract sequences. Economist Mahmoud El-Gamal famously frames much of this as legal arbitrage. Practitioners and Sharia scholars respond that contractual rights, asset ownership and risk are not empty formalities and that lawful structure matters.

That debate is where the future lies.

Continue the series

Begin with Article 1: Why Islam Forbids Riba — and Why “Interest Is Haram” Is Only the Beginning.

Money Under Islamic Law: Interest, Trade, Debt, Banking and the Architecture of Islamic Finance