Sukuk: The Islamic Bond That Is Not Supposed to Be a Bond

Calling sukuk an “Islamic bond” is useful in exactly the way calling a whale a “very large fish” is useful. It gets the newcomer into the right part of the ocean and then immediately creates the wrong mental model.

A conventional bond is fundamentally debt. An issuer borrows money. Investors become creditors. The issuer promises principal and usually pays interest. The entire instrument can be described without referring to a warehouse, aircraft, road, lease, partnership or business venture.

Sukuk are supposed to begin somewhere else.

The certificates represent defined interests associated with assets, usufructs, services, investment ventures or other Sharia-permissible structures. The investor's return comes through the underlying arrangement—rent, sale proceeds, investment profit or another permitted source—rather than simply because money was lent at interest.

That distinction sounds clean in a textbook.

In global capital markets it becomes complicated very quickly.

Investors want predictable distributions. Governments want funding that behaves like sovereign debt. Lawyers want structures that can be issued under familiar securities laws. Rating agencies want clarity about who ultimately pays. Treasury departments want refinancing certainty. Secondary markets want tradability. Sharia scholars want the certificates to represent something more than an interest-bearing IOU with Islamic vocabulary around it.

The modern sukuk market is where all those demands collide.

Why conventional bonds create a Sharia problem

Consider a plain five-year US$500 million bond paying 5% annually.

Investors advance US$500 million to the issuer. The issuer owes annual interest and returns principal at maturity. The investor's entitlement is debt plus interest.

If conventional interest on a loan falls within prohibited riba, the structure cannot become compliant merely by renaming the coupon “profit.” The legal source of the payment has to change.

This is the same problem we encountered with murabaha and tawarruq in Part 2, but now at capital-market scale.

An Islamic capital-market instrument therefore asks: what can investors own or participate in that lawfully generates cash flow?

Possible answers include leased assets, partnership interests, investment ventures, sales or construction arrangements. The specific contract gives the sukuk its legal architecture.

A simple ijarah sukuk example

Imagine a government owns an office complex worth US$500 million and wants to raise capital.

A simplified ijarah structure could work like this:

1. A special-purpose vehicle issues US$500 million of sukuk certificates to investors.

2. The SPV uses the proceeds to acquire a defined interest in the buildings or their usufruct.

3. The buildings are leased to the government.

4. Government lease payments flow through the SPV to certificate holders as periodic distributions.

5. At maturity, the relevant asset interest is repurchased or otherwise realized according to the transaction documents, and investors receive the redemption amount.

Economically, investors may receive a fixed-looking return every six months and recover an amount at maturity that resembles principal.

Legally, the theory is different from an unsecured loan. Their entitlement is connected to the asset and lease structure.

This is the theory. The difficult question is how much of the asset ownership survives the demands of real-world capital markets.

What does a sukuk investor actually own?

This may be the single best question to ask about any sukuk.

The offering memorandum can be hundreds of pages long. Strip it down and ask:

If something goes wrong tomorrow, what exactly does the certificate holder have?

Is there a genuine beneficial ownership interest in an asset? A right to cash flows but no meaningful asset recourse? A partnership participation? A receivable? A contractual promise ultimately supported by the issuer's credit?

The answer matters because the word sukuk describes a family of structures, not one instrument.

Asset-backed versus asset-based

Market discussions often distinguish “asset-backed” and “asset-based” sukuk.

In a strongly asset-backed structure, investors' claims are materially tied to the underlying assets, and asset performance and recourse can matter directly.

In many asset-based structures, the assets play a role in the Sharia and contractual architecture, but investors' practical credit exposure may remain heavily dependent on the originator or obligor. The asset transfer may not give investors the kind of bankruptcy-remote enforcement rights that a securitization lawyer would associate with a true sale.

That difference became painfully visible in various sukuk defaults and restructurings, where investors discovered that “ownership” in the Sharia structure did not always translate neatly into the enforcement rights they assumed they had under secular insolvency law.

The lesson is not that sukuk are fictitious. The lesson is that Sharia characterization, securities documentation and local property/insolvency law must all line up.

The fixed-income paradox

Capital markets like certainty.

Investors compare yields. Fund managers manage duration. Banks mark instruments to market. Issuers budget debt-service-like cash flows. Rating agencies model default probability.

So even though sukuk are not supposed to be conventional bonds, the market rewards products that behave like conventional fixed income.

This creates a powerful gravitational pull.

A structure may use assets, leases or partnership contracts, yet contain purchase undertakings, liquidity facilities and other mechanisms designed to make periodic distributions and redemption highly predictable.

At some point the obvious question appears:

If the investor receives a predetermined return and US$100 back for every US$100 invested regardless of the underlying asset value, how much investment risk is the investor actually taking?

There is no universal one-line answer. Different sukuk structures carry different risks, and Sharia standards distinguish among them. But the question has driven major standard-setting debates for years.

Purchase undertakings: the detail that can change everything

Suppose investors fund a partnership venture. If the venture's assets decline in value, genuine equity logic suggests investors should feel that loss.

Now add an undertaking by the originator promising to buy the assets at maturity for the exact original principal amount.

The investors' market risk has just changed dramatically.

Purchase undertakings can serve legitimate commercial functions, but their pricing and use in partnership-based structures have been controversial because guaranteeing redemption at face value can make an equity-like instrument behave like debt.

AAOIFI scholars have previously scrutinized these features, especially in musharakah and mudarabah sukuk. The broader issue is familiar from Part3 : a partnership stops looking much like a partnership if capital and return are fully guaranteed by the managing counterparty.

Tradability reveals what the certificates represent

A conventional bond can normally be bought and sold as a debt security subject to applicable law.

In Islamic jurisprudence, selling debt can raise restrictions. That means secondary-market tradability of sukuk may depend on the composition of what the certificates represent.

The International Islamic Fiqh Academy has addressed sukuk tradability in relation to the underlying pool. Where the certificates represent tangible assets, usufructs or services, trading can be treated differently from certificates whose substance is predominantly cash or receivables.

This has profound structuring implications.

If an issuer wants a liquid security, it cannot ignore what happens to the asset pool after issuance. A structure that begins with physical assets but later becomes mostly debt receivables may face different Sharia treatment.

For payments professionals, this is an unusually clear example of an old legal classification problem appearing inside modern market infrastructure: the tradability of a token or certificate depends on what it legally represents.

Are sukuk backed by assets the way mortgage securities are?

Sometimes; often not in the way a newcomer assumes.

A mortgage-backed security is associated with a pool of mortgage assets and cash flows, but the exact nature of investor recourse depends on the legal structure. The same caution applies to sukuk.

The presence of an asset in a diagram does not automatically mean investors can seize or sell it upon default.

A serious sukuk analysis should ask at least five questions:

1. What assets or rights were transferred?

2. Was the transfer a true legal sale, a beneficial interest, a lease right or something more limited?

3. What does local law recognize if the originator becomes insolvent?

4. Is investor recourse to the asset, the obligor, or both?

5. Does the Sharia structure survive enforcement, or do secular-law remedies produce a different reality?

This is where Islamic finance becomes inseparable from ordinary capital-markets law.

Sovereign sukuk make the tension even sharper

Governments issue sukuk because they need large-scale funding and because Islamic investors need investable instruments.

But sovereign assets are not ordinary commercial collateral. Governments can face constitutional and statutory restrictions on transferring public property. Investors may not realistically expect to evict a ministry from its offices if a payment is missed.

As a result, sovereign structures frequently have to balance a meaningful asset framework with the realities of sovereign credit.

The market may therefore price the instrument primarily on the government's creditworthiness even though the Sharia structure includes assets.

Again, economic similarity does not automatically erase legal distinction. But the greater the investor's practical reliance on the sovereign's promise rather than asset performance, the more important it becomes to explain what “ownership” means in the specific transaction.

The AAOIFI sukuk debate is still moving

This article is being researched as of October 1, 2026, and the timing matters.

AAOIFI has been working on a revised Sharia standard for sukuk. Its public exposure-drafts page still lists a “Standard Draft Sukuk,” meaning the revision remains part of an active standard-setting process rather than something that should be described as settled final law.

That draft has attracted substantial market attention because changes to ownership, asset transfer, guarantees and other Sharia requirements could alter how some sukuk are structured.

Market analysts, including S&P Global Ratings, have warned that stricter treatment could make issuance more complex and push parts of the market toward more genuinely risk-sharing or asset-linked forms. Those are analysts' assessments, not a final AAOIFI conclusion, but the debate is significant.

The most important editorial lesson is simple: do not write about “the AAOIFI 62 rule” as though an exposure draft were already final and universally binding. Standards evolve, and adoption differs by jurisdiction.

Why the market cares about standardization

Imagine a conventional bond whose validity changes depending on which lawyer's theological reasoning your fund manager accepts.

That would be unworkable at scale.

Islamic capital markets therefore need standardization more urgently than many bilateral financing arrangements. A US$1 billion sukuk may be distributed to banks, funds and individuals across the Gulf, Southeast Asia, Europe and beyond. Each investor cannot commission a fresh jurisprudential analysis of every contractual clause.

AAOIFI helps by producing Sharia standards. National regulators issue local requirements. Sharia boards approve transactions. Lawyers document them. Exchanges establish listing rules.

But there is no single global legislature that makes one interpretation automatically binding everywhere.

The governance problem is so important that Part 5 is devoted to it.

Sukuk versus green bonds and tokenized securities

The structure is also moving into areas that did not exist when modern sukuk markets began.

Green and sustainability sukuk combine Sharia requirements with use-of-proceeds or sustainability frameworks. Tokenization raises the possibility that sukuk interests can be represented and settled on digital ledgers. Smart contracts can automate distributions and compliance checks.

But technology does not simplify the underlying Sharia question. It can make it more explicit.

If a token represents a sukuk certificate, what does the token holder legally own? Can the token be freely transferred? Does on-chain settlement constitute possession? If the underlying pool changes composition, does the token remain tradable under the same rules?

Blockchain solves recordkeeping. It does not answer jurisprudence.

Those questions reappear in Part 10.

A US$500 million thought experiment

Imagine two instruments issued by the same company.

Instrument A: conventional bond

• US$500 million principal.

• 5% coupon.

• Five-year maturity.

• Senior unsecured corporate obligation.

Instrument B: ijarah sukuk

• US$500 million certificates.

• SPV acquires specified asset interests.

• Company leases the assets and makes rental payments calibrated to produce approximately 5% distributions.

• Purchase undertaking supports redemption at maturity.

A portfolio manager may model both instruments as five-year exposure to the same corporate credit. Prices may move almost in parallel.

Yet the instruments can still differ legally.

The sukuk has an SPV, asset documentation, lease mechanics, Sharia representations and additional transaction parties. The conventional bond has a simpler debtor-creditor architecture.

The crucial analytical question is whether those differences change real rights and risks sufficiently to justify the Sharia characterization—or whether the extra structure has become economically ceremonial.

That is not answered by pointing to the 5% number.

The practical takeaway

Sukuk Islamic bonds are best understood as an attempt to build capital-market instruments from permissible contracts rather than from interest-bearing debt.

The label “Islamic bond” helps readers understand the economic use: raising medium- or long-term capital and producing investable periodic cash flows. It becomes misleading when it suggests that every sukuk is legally just a bond with a different name.

The quality of the structure depends on what certificate holders actually own, what risks they bear, how distributions arise, what happens on default and whether the asset or venture remains meaningful after lawyers finish protecting investors from uncertainty.

The more sukuk are engineered to provide bond-like certainty, the harder the industry has to work to show that the Sharia architecture still has substance.

That is why the next question is unavoidable:

Who decides whether the structure has crossed the line?

Key terms used in this article

Further reading and primary references

1. AAOIFI, Sharia standards and current exposure drafts: AAOIFI Shari'ah Standards and Exposure Drafts.

2. International Islamic Fiqh Academy, resolutions concerning sukuk and tradability: IIFA.

3. Islamic Financial Services Board, prudential standards for Islamic capital markets: IFSB.

4. Frank E. Vogel and Samuel L. Hayes III, Islamic Law and Finance: Religion, Risk, and Return.

5. Muhammad Taqi Usmani, writings on sukuk and Islamic finance structures.

6. S&P Global Ratings and other market research on the potential implications of AAOIFI's proposed revised sukuk standard; use as market analysis, not as a substitute for the final AAOIFI text.

Continue the series

Previous: Part 3 — Mudarabah and Musharakah

Series hub: Money Under Islamic Law

Next: Part 5 — Who Decides What Is Sharia-Compliant?

Later: Part 10 — Stablecoins, Tokenization and What Islamic Finance Becomes Next.