Management overlay
Sector Deep DivesA manual addition to a bank's modelled expected credit loss provision, made where management believes the model misses a risk that is real.
Also written: post model adjustment, post-model adjustment, PMA
Expected credit loss provisions are produced by models fed with macroeconomic scenarios. When management believes a risk is real but not captured by the model, it adds a management overlay, sometimes called a post model adjustment, on top of the modelled output.
Overlays are legitimate and were used heavily when models trained on historic data met conditions those data did not contain. They are also the most discretionary number in a bank's accounts, which is why supervisors press for them to be disclosed separately and why an analyst should look for them before anything else in the impairment note.
The reason they matter for earnings is timing. An overlay built in a stressed period sits on the balance sheet as a provision. When it is released it flows straight to profit, and reported earnings improve while nothing at all changes in the loan book.
The useful question is not whether an overlay exists but what would have to happen for it to be released, and whether a release represents a reversal of judgement or a genuine improvement in credit. Banks vary a great deal in how clearly they answer that, and the variation is itself informative.
Worked example
Illustrative: a bank carries 200 of provisions, of which 60 is an overlay for a sector its models do not treat separately.
The following year it releases 40 of that overlay. The impairment charge falls by 40 and pre tax profit rises by the same amount.
Nothing in the loan book changed. A reader who treats the improvement as underlying credit performance has misread the disclosure, which is the whole reason the disclosure exists.