Sukuk (Islamic Bonds) Explained

Conventional bonds pay interest on borrowed money — a structure that Islamic law (Shariah) prohibits, since charging or paying interest (riba) is forbidden. Yet governments and corporations across the Gulf, Southeast Asia, and increasingly Europe and the US raise tens of billions of dollars a year through Sukuk, instruments that deliver bond-like returns to investors while avoiding interest in a formal legal sense. Understanding how that's achieved is essential for anyone working with Islamic finance or global debt capital markets more broadly.

What Is a Sukuk?

A Sukuk (plural: Sukuk, though often used as both singular and plural in English-language finance) is often described as an "Islamic bond," but the comparison, while useful, understates a genuine structural difference. Rather than lending money in exchange for interest, a Sukuk represents an undivided beneficial ownership interest in a specific underlying asset, pool of assets, business venture, or project. Investors (Sukuk holders) are compensated through profit generated by that underlying asset — most commonly structured as rental payments, profit-sharing, or a pre-agreed sale and repurchase arrangement — rather than through interest on a loan. For general background on how these principles apply across Islamic finance more broadly, see our guide to how Islamic finance works.

Common Sukuk Structures

Several standard structures have become market conventions, each built around a different underlying Shariah-compliant contract:

• Ijara Sukuk — the most common structure, based on a lease arrangement. The issuer sells an asset to a special purpose vehicle (SPV), which leases it back to the issuer in exchange for rental payments that are distributed to Sukuk holders as their return, with the SPV holding legal or beneficial title on investors' behalf.
• Murabaha Sukuk — based on a cost-plus-profit sale arrangement, where the SPV purchases an asset and sells it to the issuer at a deferred, marked-up price, with that mark-up effectively functioning as the investor return.
• Mudaraba and Musharaka Sukuk — profit-sharing structures where Sukuk holders participate in the actual profits (and in principle, losses) of an underlying venture or business, closer in spirit to an equity-like partnership than a fixed-return instrument.

Each structure carries different risk and return characteristics, and the specific documentation needs to satisfy Shariah compliance requirements set by the issuer's Shariah supervisory board, whose sign-off is a standard prerequisite before a Sukuk can be marketed as compliant.

How Sukuk Compare to Conventional Bonds

From an investor's practical perspective, a well-structured Sukuk can behave quite similarly to a conventional bond — periodic distributions that resemble a coupon, a defined maturity or redemption date, and a credit rating reflecting the issuer's or underlying asset's creditworthiness. The key legal and structural differences are the asset-backing requirement (Sukuk must have a genuine link to underlying tangible assets or ventures, unlike unsecured conventional bonds, which represent a pure payment obligation) and the prohibition on guaranteed principal repayment in the strictest Shariah interpretations, since a Sukuk holder is technically bearing some ownership risk in the underlying asset rather than holding a pure debt claim — though in practice many structures include purchase undertakings that function very similarly to a principal guarantee for investors.

Why the Sukuk Market Has Grown

Sukuk issuance has expanded well beyond its traditional Gulf and Malaysian base, with sovereign and corporate issuers in the UK, Hong Kong, and elsewhere issuing Sukuk specifically to diversify their investor base and tap liquidity from Islamic finance institutions that are restricted or prefer not to hold conventional interest-bearing instruments. For issuers in core Islamic finance markets, Sukuk are frequently the default debt capital markets instrument rather than an alternative, given the scale of Shariah-compliant capital seeking Sukuk-eligible assets to invest in.

Legal and Restructuring Considerations

Sukuk defaults and restructurings raise more complex legal questions than a conventional bond default, precisely because of the asset-backing and ownership structure underpinning them. Where a Sukuk is "asset-backed" in the strictest sense, Sukuk holders may have a genuine claim on the underlying asset itself if the issuer defaults; where it is "asset-based" (the more common structure in practice, where the asset link exists mainly to satisfy Shariah compliance rather than to grant investors real recourse to it), Sukuk holders typically rely on contractual undertakings from the originator rather than a direct claim on the underlying asset, which can matter enormously in an insolvency scenario across different legal jurisdictions. This asset-backed versus asset-based distinction, and how courts in different jurisdictions have interpreted Sukuk documentation during restructurings, remains one of the more actively debated areas of Islamic finance law, and investors in distressed Sukuk situations need specialist legal advice on exactly what recourse their specific structure actually provides.

FAQ

Do Sukuk holders own the underlying asset directly?
Typically they hold a beneficial interest through a special purpose vehicle that holds legal title, rather than owning the asset outright in their own name, though the SPV structure is specifically designed to pass through the economic benefits of ownership to investors.

Can a non-Muslim investor buy Sukuk?
Yes — Sukuk are open to any investor and are increasingly held by conventional institutional investors seeking portfolio diversification, not only investors seeking Shariah-compliant instruments specifically.

Are all Sukuk structured the same way?
No — Ijara, Murabaha, Mudaraba, and Musharaka structures (among others) each use different underlying Shariah-compliant contracts, resulting in meaningfully different risk, return, and legal characteristics between Sukuk issuances.

Islamic finance and global debt capital markets are covered across Learnsignal's CPD course content for finance professionals.