Islamic banking at scale: Why core systems are now the deciding factor

Islamic finance is scaling rapidly, growing at over 10% annually and surpassing $5 trillion in global assets - yet the systems supporting it are under increasing pressure to keep pace. Banks today must navigate rising structural complexity, evolving regulatory expectations, and demand for seamless digital experiences. This article explores where traditional core architectures are reaching their limits and what that means for operations, compliance, and innovation. It outlines the practical challenges banks face today, along with clear pathways to simplify complexity, strengthen Shariah governance, and build scalable, future-ready Islamic banking foundations, and what that means for operations, compliance, and innovation. It outlines the practical challenges banks face today, along with clear pathways to simplify complexity, strengthen Shariah governance, and build scalable, future-ready Islamic banking foundations.

Islamic banking complexity requires purpose-built foundations

Islamic banking introduces contract based complexity that goes far beyond parameter tweaks. Many banks still run Islamic products on conventional cores retrofitted with workarounds, creating operational, compliance, and scalability risks. Islamic banking has matured commercially, but much of its infrastructure still reflects a first-generation technology mindset. This complexity is often compounded by running separate systems for Islamic and conventional operations, creating duplication, data fragmentation, and additional operational overhead that limits scalability and efficiency.

Multi-contract structures such as Murabaha, Ijarah and Musharakah require lifecycle-based accounting, asset ownership tracking, and profit-based (rather than interest-based) calculations. This complexity places significant strain on the back office when core systems cannot natively model Shariah-compliant contracts, leaving banks reliant on spreadsheets or fragmented side systems to manage compliance, driving operational inefficiencies, increasing risk, and limiting scalability.

Real world implications:

• Slow product launches (months instead of weeks)
• Increased operational risk and manual intervention
• Difficulty scaling Islamic portfolios across regions

The competitive advantage does not come from separating Islamic banking - but from unifying it on a single, purpose built foundation. Running Islamic and conventional banking on a single, unified core platform enables a single source of truth, reduces duplication, and delivers more consistent customer experiences, while lowering operational complexity and cost.

Shariah compliance is not a “front-office feature” — it’s a core design principle

True Shariah compliance must be embedded deep in the core, not layered on top at the product or reporting level. The next phase of Islamic banking is not about innovation alone - it is about verifiable trust at scale. Compliance is becoming real-time, operational, and auditable, and not post-transaction. This means enabling live transaction traceability, embedded Shariah-compliant workflows, and audit-ready lineage of assets and contracts.

Many legacy systems lack built-in Shariah rules engines and fail to provide audit-ready transaction lineage required for effective Shariah review. At the same time, Shariah boards increasingly demand greater transparency, including clear traceability of funds and verifiable proof of asset linkage and ownership transfer, raising the bar for core system capabilities. Regulatory scrutiny is increasing in markets like:

• Indonesia: The Financial Services Authority (OJK) issued POJK No. 2/2024, making Shariah governance mandatory and standardized for Islamic commercial banks and Islamic business units, as part of its 2023–2027 Sharia Banking Development and Strengthening Roadmap. Banks rolling out digital Islamic products must prove that Shariah principles are upheld within automated workflows, digital contracts, and real-time reporting, significantly raising expectations for core system capability.
• Malaysia: Bank Negara Malaysia (BNM) revised its Policy Document on Islamic Banking Windows in November 2024, with implementation from January 2025. The focus has shifted to sustainability, consistency, and scalability—which puts pressure on banks to replace spreadsheet led controls and parallel systems with integrated, configurable core platforms that support Islamic banking natively.
• GCC: Across the GCC, Islamic banking regulators have moved decisively from principles based guidance to enforceable, system level requirements, particularly around governance and technology enablement. The UAE’s 2025 Central Bank Law expands regulation into digital finance and reinforces the binding authority of the Higher Shariah Authority, with implementation running into 2026 - requiring banks to embed Sharia governance and compliance directly into core systems.

As regulatory scrutiny intensifies, Islamic banks are discovering that compliance is no longer defined by intent or structure, but by the strength, transparency, and auditability of the core systems that execute Shariah principles every day.

Accounting, profit distribution, and financial reporting are structural challenges

Islamic finance introduces distinct accounting treatments that conventional cores struggle to support natively. Without purpose built core capabilities, Islamic banks risk spending more time reconciling the past than designing the future.

Real world implications

• Finance teams maintain parallel books
• Delayed closes and reconciliation issues
• Inconsistent reporting across jurisdictions

Banks need to emphasize accurate profit calculation, automation, and reduced manual effort, reinforcing that Islamic accounting and operational procedures adhering to the regional/local Shariah-compliant practice must be handled at the core, not through overlays.

Digital Islamic banking cannot scale on legacy foundations

Customer expectations for digital Islamic banking experiences rival those of conventional banks, but legacy cores fundamentally limit what’s possible. Digital Islamic banking success depends less on user experience design and more on whether the core can faithfully represent Shariah compliance in real time.

Islamic digital instruments, across both financing and liability management, increasingly require capabilities such as real-time contract validation, dynamic profit simulations, and transparent, customer-friendly disclosure journeys - demands that legacy core systems, built around account-centric, interest-based logic and batch processing, struggle to meet.

Real world implications

• Slower time to market, limiting responsiveness to market changes
• Reduced product differentiation due to over-standardized offerings
• Innovation constrained by legacy systems and rigid architectures

At the same time, the rise of fintech partnerships and embedded finance is accelerating the need for API-driven integration and modular product engines. To respond, banks must modernize their core architecture toward more flexible, contract-centric platforms that support real-time processing and enable configurable product innovation, aligning technology foundations with the evolving expectations of Islamic digital banking. Digital scalability directly to a core that can support automation, STP, APIs and flexible deployment options (on-prem or cloud).

Modernization without disruption - the “no-compromise” challenge

“Rip and replace” transformations present unique challenges in Islamic banking, where preserving Shariah compliance and customer trust is critical. Islamic banking modernization is not a technology journey - it is a governance journey enabled by technology.

Islamic banks face the complex challenge of balancing legacy portfolios, live Shariah-compliant contracts, and increasing regulatory oversight, all while managing the risks associated with transformation. This calls for a pragmatic, phased core modernization approach built on coexistence strategies, gradual migration, and product-by-product evolution rather than “big bang” change. As a result, transformation roadmaps must be structured to remain phased, fully auditable, and aligned with Shariah requirements at every step, ensuring sustained trust from regulators, Shariah boards, and customers. Finastra Universal Banking is pioneering symbiosis as a strategic, evolutionary approach to modernization, allowing financial institutions to integrate modern, cloud-based technology alongside existing legacy systems without the need for high-risk, "rip-and-replace" overhauls. By introducing a next-generation system alongside the existing infrastructure, banks can bypass the need for bank-wide, disruptive transformations. The symbiotic relationship allows for the rapid rollout of new capabilities without disturbing the intricate web of legacy systems, ensuring a harmonious coexistence.

The industry is moving towards purpose built Islamic banking capabilities. Leaders are adopting contract-centric core models with native Shariah compliance frameworks and configurable profit and accounting engines to enable greater flexibility, transparency, and control. Vendors with deep Islamic banking heritage and global deployments are better positioned to support scale and regulatory confidence.

One of Finastra Universal Banking’s clients – AB Bank, a leading commercial bank in Bangladesh, has scaled from its first Islamic Banking Branch in 2004, to eight ‘Islamic Banking Windows’ in divisional branches launched in 2024. Within a year, these windows generated Mudarabah investments exceeding Taka 200 Crore ($18 million), reflecting customer satisfaction and confidence.

Sheikh Monirul Islam, EVP & Head of Core Business Team AB Bank PLC quotes – “Finastra’s Islamic Banking stands out for its exceptional flexibility, reliability, and robust automation of Islamic Profit Distribution (IPD). The platform supports multiple pools and product types, along with customizable distribution rules, and fully automated IPD processes. This flexibility ensures seamless compliance with local laws and international standards, positioning the system as a leader in Islamic banking technology.”

For banks exploring how a purpose built core can support their transition, Finastra Universal Banking’s Islamic banking platform is positioned as a truly Shariah compliant, modern, proven, resilient and functionally rich digital platform. Finastra supports both full-scale transformation and phased modernization approaches (Symbiosis), acknowledging that not all banks transform in the same way.

Islamic banking’s next chapter will be written not just by product innovation, but by the strength of the core systems that uphold Shariah principles, enable trust, and allow banks to grow with confidence in an increasingly digital world.