Sukuk Explained: The Halal Alternative to Interest-Bearing Bonds

Ask ten investors what a sukuk is and eight will say "Islamic bond." That shorthand is the reason so many people end up confused when they read an actual prospectus and find no principal, no coupon, and a trust that owns a warehouse. Sukuk explained properly, as the halal alternative to interest-bearing debt, starts with a structural fact: a bondholder owns a promise to be repaid money plus more money, while a sukuk holder owns an undivided beneficial share in an asset, a usufruct, or a business venture, and gets paid out of what that thing earns. Whether any given sukuk actually delivers on that promise is a separate question, and it is where the real scholarly fight lives.

Why a conventional bond fails the riba test

The prohibition here is not a vague preference for ethical finance. Quran 2:275 draws the line directly: God permitted sale and forbade riba. Verses 2:278 and 2:279 then tell believers to give up what remains of riba and warn of war from God and His Messenger for those who do not, adding that if you repent, you have your principal sums, wronging no one and not being wronged. That last clause is the technical heart of it. You may recover what you lent. Any contractual excess on the loan itself is the forbidden increase.

Classical jurisprudence splits this into riba al-nasiah, the increase stipulated for deferment on a loan or exchange, and riba al-fadl, the excess in a hand-to-hand exchange of the same ribawi commodity. A ten-year Treasury or an investment-grade corporate bond is a textbook case of the first. You hand over $1,000, the issuer contractually owes you $1,000 back plus a stated coupon, and the payment obligation exists whether the issuer's factories run or sit idle. The lender's return is guaranteed by contract and detached from any outcome in the real economy.

Sukuk are built to break exactly that link. AAOIFI Shariah Standard No. 17 on Investment Sukuk defines them as certificates of equal value representing undivided shares in ownership of tangible assets, usufructs, and services, or in the assets of a particular project or investment activity. The certificate is evidence of ownership, not evidence of a debt owed to you.

Where the money actually comes from: ijarah sukuk, step by step

The cleanest structure to learn first is the ijarah (lease) sukuk, which is why sovereigns from Malaysia to Saudi Arabia to Indonesia have leaned on it for years.

Say a government needs to raise cash without borrowing at interest. It identifies real assets it already owns, land parcels, a terminal building, a highway concession, whatever is tangible and leasable. It sets up a special purpose vehicle, usually an orphan trust in a jurisdiction with workable trust law. Investors subscribe to certificates, and the SPV uses those proceeds to buy the assets from the government. The SPV then leases the same assets back to the government under an ijarah contract for a fixed term.

Now the mechanics of yield. The government pays rent. The SPV, as trustee, passes that rent through to certificate holders as periodic distributions. At maturity, or on a dissolution event, the government buys the assets back under a purchase undertaking, and that purchase price funds the redemption payment.

Rent is a legitimate return on an owned asset. A landlord charging rent is not a lender charging interest, and no school of Islamic law has ever suggested otherwise. That is the reasoning that makes ijarah sukuk work: the cash flow has a genuine source in the productive use of property, and the holders bear the ownership risks that come with it, including, in principle, total loss of the asset and the residual value risk at the end.

Other structures generate yield differently. Murabaha sukuk fund a cost-plus commodity sale and the return is the disclosed profit markup. Wakalah sukuk pool assets managed by an agent against a target profit rate. Mudarabah and musharakah sukuk share in the actual profits of a venture, which is why they behave more like equity. Istisna'a sukuk finance construction and get paid out of the completed project. Salam sukuk prepay for a commodity to be delivered later.

Two practical consequences follow. First, most sukuk are floating or fixed against a benchmark like SOFR or a domestic policy rate, because rent and markup can be indexed to something. Scholars have generally allowed benchmarking to an interest rate as a pricing reference while insisting the contract itself is a lease or a sale, on the reasoning that using a haram number as a yardstick does not make the underlying transaction a loan. That position is widely held and also widely criticised as cosmetic.

Second, murabaha-based sukuk create receivables, and a receivable is a debt. AAOIFI's position is that debt cannot be traded at anything other than par, because selling a debt at a discount is bay' al-dayn and reintroduces riba. Malaysia's Shariah Advisory Council of the Securities Commission has historically permitted bay' al-dayn in the domestic market, which is a large part of why the ringgit sukuk market developed the way it did and why some Gulf investors will not touch certain Malaysian paper. This split is real, longstanding, and useful to know before you assume all sukuk are interchangeable.

Asset-backed versus asset-based: the distinction that decides everything

This is the part most explainers skip, and it determines whether you actually own anything.

Asset-backed

In a true asset-backed sukuk, the assets are legally transferred to the SPV. The sale is a true sale, perfected under the governing law, and the assets sit outside the originator's bankruptcy estate. If the originator collapses, holders have recourse to the assets themselves. Rating agencies look at asset quality, not the originator's credit. These are structurally securitisations, and they are the minority.

Asset-based

In an asset-based sukuk, which is the overwhelming majority of what trades, the transfer is beneficial rather than a fully perfected legal conveyance. Holders have no enforceable claim on the property itself. What they have is the originator's purchase undertaking (wa'd) to buy the assets back at a pre-agreed price, usually the outstanding face amount plus accrued distributions. If the originator defaults, you are an unsecured creditor of the originator, ranking pari passu with its conventional bondholders. The asset served as a Shariah conduit rather than as collateral.

The Dana Gas dispute in 2017, where the issuer argued in court that its own mudarabah sukuk had become unlawful under UAE law, and various Gulf restructurings before and since, made this concrete for a lot of investors who had assumed otherwise.

The strongest counterargument, and Usmani's 2007 critique

The sharpest attack on the modern sukuk market did not come from outside Islamic finance. It came from Shaykh Muhammad Taqi Usmani, then chairman of AAOIFI's Shariah Board, in a 2007 paper on sukuk and their contemporary applications. His argument was blunt: in a large share of outstanding issues, the purchase undertaking at face value effectively guaranteed the holders' capital and a fixed return regardless of the venture's performance, which is precisely what a mudarabah or musharakah forbids. His widely quoted estimate at the time was that the great majority of sukuk in the market failed to comply in substance.

AAOIFI's Shariah Board issued a statement in February 2008 that tightened the rules along those lines. The core points: sukuk must represent real ownership with all the legal consequences of ownership, including risk and the right to dispose; the manager in a mudarabah, musharakah or wakalah structure may not undertake to buy the assets at face value, only at market value, fair value, or a price agreed at the time of purchase; the manager may not lend to cover a shortfall in expected distributions; and sukuk should not represent pure receivables except incidentally within a trading entity's mixed assets. An ijarah lessee is treated differently, because a lessee buying leased property at an agreed price is a normal sale, not a capital guarantee to a partner.

The counterargument from practitioners is serious and worth stating fairly. Form matters in fiqh. A lease is a lease and a purchase undertaking is a unilateral promise, both recognised contracts, and an economic outcome that resembles a bond does not make the contract a loan. Institutions also point out that if sukuk had to be true asset-backed securitisations with genuine ownership risk, sovereigns and corporates could not issue at scale, most Islamic banks could not hold them for liquidity purposes under Basel treatment, and Muslim investors would be pushed back toward conventional bonds. That is a real trade-off, not an excuse.

The debate reopened forcefully with AAOIFI's exposure draft of Shariah Standard No. 62 on sukuk, released for public consultation in 2023, which pushed toward requiring genuine transfer of ownership and risk. Market participants, rating agencies and issuers responded that a strict version would reprice and reshape a very large share of issuance, and the standard's final form and effective date have been the subject of extended consultation. Whatever lands, the substance-over-form question Usmani raised nearly twenty years ago is still the live one.

How FaithScreener handles interest income and sukuk exposure

Screening a sukuk is not the same job as screening a stock, and the platform treats them differently.

For equities, the standard AAOIFI-style financial filters do the work: interest-bearing debt against market capitalisation kept under roughly a third, cash and interest-bearing securities under the same kind of ceiling depending on the index methodology you follow, and income from non-compliant sources, including interest income, held under 5% of total revenue with the tainted portion purified out. Dow Jones Islamic Market, S&P Shariah, FTSE and MSCI all apply variants of this, with the main divergence being whether the denominator is a 24-month average market cap or total assets. The comparison of those denominators sits in our screening methodology, and it matters more than most people expect for leveraged names.

For a sukuk, the questions shift. What is the underlying contract, ijarah or wakalah or murabaha or a hybrid? Are the underlying assets themselves compliant, since a lease on a brewery's bottling plant fails on the business activity screen no matter how clean the contract is? Is the structure asset-backed or asset-based, and is there a purchase undertaking at face value in a partnership structure? Was it certified, and by whom? A sukuk approved by a Malaysian SAC-aligned board on bay' al-dayn grounds may not clear an AAOIFI-aligned board, and that is a difference you should see rather than have averaged away. You can compare how the Islamic framework and the other faith lenses treat fixed income exposure side by side, and run a specific holding through the screener to see the interest-income line broken out.

A short cross-faith note, since sukuk get pitched as universally ethical. Interest itself is not prohibited to Christian, Catholic, Jewish or LDS investors in contemporary practice. Biblically Responsible Investing screens the six categories of business activity, not the financing structure. USCCB guidelines exclude weapons, abortion-related activity and similar categories, again without touching bond mechanics. Halakhic ribbis rules do restrict interest between Jews, but the standard workaround, the heter iska, restructures a loan as a joint venture, which lands in similar territory to a mudarabah. For a non-Muslim investor, a sukuk is judged on what the underlying assets and issuer actually do.

Practical guidance before you buy

Read the structure diagram in the prospectus before the yield table. Find the words "purchase undertaking" and check the exercise price. Establish whether the sale to the SPV was a true sale or a beneficial transfer, and note the governing law along with where enforcement would actually happen. Check who certified it, because a fatwa from an AAOIFI-aligned board and one from a domestic Malaysian board are answering slightly different questions. Look at what the assets are, since compliant paper backed by non-compliant operations fails the more important test. And if you are buying a sukuk fund or ETF rather than a single issue, read the fund's own Shariah policy, because it may hold a sleeve of murabaha receivables for liquidity that you would not have bought directly.

The Bottom Line

Sukuk avoid riba by paying you out of rent, profit or a disclosed markup on real assets rather than a contractual increase on a loan, and an ijarah sukuk is the clearest case of that working as intended. The single thing to carry with you is the asset-backed versus asset-based split: most of the market is asset-based, meaning your recourse in a default runs to the originator's balance sheet rather than to the property, and a purchase undertaking at face value in a mudarabah or musharakah structure is precisely what AAOIFI's 2008 statement was written to stop. Check that clause before you check the yield.

This is educational research rather than a religious ruling or personalized investment advice, so confirm any specific holding with a qualified scholar or advisor.