The economic shock caused by the Covid-19 pandemic has resulted in a sharp increase in banks’ cost of risk. This has been particularly steep for the Spanish, Italian and Portuguese banking systems, which are notably oriented towards retail banking and have relatively high levels of exposure to the sectors most affected by the pandemic. Moreover, the effects of the sanitary crisis on the cost of risk have been exacerbated by the forward-looking approach of the IFRS 9 impairment model for financial instruments, which has been in force since 1 January 2018. Under this accounting standard, it is not the defaults themselves that give rise to the recording of provisions for impairment, but the mere expectations of such defaults