The European Central Bank (ECB) has released an updated version of its Guide to Internal Models, introducing significant changes to the way banks manage and validate credit risk under the Internal Ratings-Based (IRB) approach. The revisions align with the Capital Requirements Regulation III (CRR3) and incorporate elements from the EBA Supervisory Handbook, signalling a stronger and more detailed supervisory framework.
The updated guide places greater emphasis on governance, internal validation, and accountability, clarifying the responsibilities of senior management when submitting model applications and ensuring institutions maintain robust internal control frameworks. It also introduces more granular requirements for estimating key credit risk parameters such as Probability of Default (PD) and Loss Given Default (LGD), alongside clearer definitions of default and stricter validation procedures.
Overall, the revised framework aims to promote more conservative, transparent, and harmonised modelling practices across the euro area. As banks prepare for model reviews and regulatory approvals, understanding these changes will be critical to ensuring compliance, improving risk management processes, and avoiding supervisory challenges.