The loss rate for a set of exposures is the ratio of total losses for this set of exposures divided by total exposure values of this set of exposures, i.e. unlike for Loss Given Default (LGD), not limited to defaulted exposures only. In the absence of sufficient realised losses, consideration should be given to alternative data where appropriate conservatism can be demonstrated.
In the context of Article 154(4)(d) of Regulation (EU) No 575/2013 (CRR), a portfolio of exposures (set of exposures) for which loss rates are to be determined needs to be distinguished into several subsets of exposures by Probability of Default (PD) bands because having exhibited low volatility of loss rates, relative to their average level of loss rates, is required especially within the low PD bands.