Model risk, as the UK Capital Requirements Regulation defines it, is the potential loss an institution may incur as a consequence of decisions that could be principally based on the output of internal models. The head of model risk runs the second line for that risk: the inventory, the policy, independent validation, and the reporting that tells the board how far each model can be trusted.
The PRA’s SS1/23 sets out five model risk management principles for banks and has applied since 17 May 2024. It expects an accountable senior management function, the most senior individual responsible for the risks from the firm’s models, to oversee the framework; in the banks we search for that is usually the chief risk officer, SMF4, and the head of model risk reports to them.
The first thing we settle in a brief is the boundary. In one firm the title runs validation alone; in another it owns the framework while validation reports separately; in a third it is expected to build the models too, which sits badly with a risk function the PRA’s rules require to be independent from the operational functions. Candidates ask which job it is on the first call.
Sources: UK CRR, Article 4(1)(12); PRA SS1/23, April 2026 version, paragraphs 1.5 and 1.8 and Principle 2.2; PRA Rulebook, Senior Management Functions Part, rule 3.4, and Risk Control Part, rule 3.4.