How modern Core Banking Systems are redefining accounting

Core banking systems (CBS) must now integrate complex accounting requirements that are directly tied to regulatory, auditing, responsiveness, and data aggregation needs.

This article highlights four major trends shaping the evolution of accounting within modern CBS:

• Native and configurable integration of auxiliary accounting, with seamless connectivity to the General Ledger (GL)
• Real-time processing
• Automatic reconciliation and lettering
• The use of mirror accounts and safeguarding mechanisms

These innovations, embedded within the Skaleet platform, are redefining the role of CBS. No longer limited to transactional management, CBS now plays a central role in ensuring reliability and strengthening accounting oversight.

Subsidiary accounting with easy integration into the General Ledger

Historically, the generation of accounting data for auxiliary activities (such as customers, suppliers, and internal accounts) was handled by external tools. This required data exports, manual adjustments, and constant efforts to maintain consistency across multiple systems.

Today, a modern CBS integrates this logic natively through several key features:

• Dynamic referencing and classification: With Skaleet, business objects (such as customer accounts, wallets, products, and operations) are organized using dynamic accounting classes. This approach enables the rapid setup of subsidiary accounting without requiring custom development.
• Automatic reclassifications and accounting indirections: Accounting flows are no longer static. They can be automatically redirected according to business rules (by product, customer type, transaction type, etc.), making it easier to structure and adapt accounting as requirements evolve.

With these capabilities, CBSs are transforming into powerful accounting engines, able to comply with general accounting standards, provide advanced account configuration, and adapt to changes without major transformations.

Real-time: an immediate and aggregated view of accounting flows

Another major transformation lies in real-time. Historically, and in many legacy banking systems, financial transactions are processed in batches. Transactions are stored throughout the day and processed all at once at the end of the day.  

The shift to real-time is revolutionizing the way we interact with accounting data:

• Real-time double entry: each transaction generates immediately balanced entries, without waiting for batch processing or export to a third-party accounting tool.

• Aggregated and centralized view: through subledger accounts (centralizing accounts), Skaleet allows you to group auxiliary entries for management or reporting purposes. This facilitates the transition from a micro view (by customer or transaction) to a macro view (by product, entity, country, etc.).

• Accounting supervision: Real-time granularity enables the monitoring of imbalances or anomalies in real-time, thereby enhancing operational robustness.

With these new capabilities, accounting becomes a tool for operational supervision, rather than just a closing tool.

Internal reconciliation is integrated into the Core Banking System

The third area concerns automatic internal reconciliation and a drastic reduction in manual reprocessing. New-generation CBSs natively integrate these functions: 

• Internal references and cross-checking of entries: Skaleet enables accounting movements to be linked via business references (such as transaction ID, session, or order), facilitating reconciliation without the need for extraction.

• Automatic matching: thanks to configurable rules (amount, date, reference, counterparty), entries are automatically matched within the platform itself, even before being sent to the General Ledger.

• Less reprocessing, more integration: this logic allows major accounts or PI/EMI to reintegrate operational accounting into their overall architecture, without complex ETL (Extract-Transform-Load) efforts.

Thanks to these capabilities, financial institutions gain in reliability while reducing the workload associated with control tasks.

Mirror accounts and safeguarding management: native regulatory accounting logic

Another key lever is the use of mirror accounts for structural use cases:

Automated bank reconciliation

Each external Nostro bank account (interbank settlement account, ring-fenced account, etc.), can be linked to a technical mirror account represented in the CBS. These mirror accounts receive clearing entries for outgoing and incoming transactions, allowing the creation or destruction of electronic money on the platform to be represented while respecting the balance imposed by the double-entry system.

The bank reconciliation tool enables the comparison of account positions by applying a line-by-line verification against bank statements.

Safeguarding management (regulatory ring-fencing)

Skaleet includes an engine for calculating daily safeguarding of customer funds based on customer account balances and applicable regulatory rules (e.g., EMI, PI).

This engine automatically generates:

• The amount to be safeguarded/released.

• The accounting entry in the dedicated mirror accounts.

• The payment order to the segregated account at the bank, issued through the platform.

This mechanism ensures complete accounting traceability of the safeguarding obligation.

Modern CBSs now embed regulatory accounting logic, such as safeguarding, through mirror accounts, automated processes, and natively controlled bank orders. In practice, these capabilities allow users to save time, work with reliable data, and confidently meet regulatory obligations.

These developments highlight a clear trend: the accounting function, once peripheral in a CBS, is now becoming a core component. A modern CBS is no longer just a producer of entries, it is a driver of accounting reliability, oversight, and seamless integration within the broader information system.