The financial regulator has released the latest summary data on mortgage arrears here. The data show a 13% increase in accounts more than 90 days in arrears. In total, 4.1 percent of mortgages are in arrears over 90 days, with 2.8 percent of these being over 180 days.
Balances on past due mortgages are higher on average than those not past due: The average balance for mortgages not past due is about 147,600 while the average balance for mortgages in arrears is 188,800. This means that past due mortgages account for 5.2 percent of the total balance of mortgages outstanding. Those mortgages past due over 180 days already have approximately 10 percent of the balance in arrears.
These calculations do not include people who are not in arrears because they have come to an agreement with their bank on a different repayment schedule.
These figures suggest to me that the Central Bank Prudential Capital Assessment Review’s “stress scenario” assumption of 5 percent looks more and more like a reasonable baseline. This is also the number the Morgan Kelly mentioned in his recent article as a conservative estimate.
How could this number come about? For instance, if the mortgages that need to be foreclosed on or restructured end up accounting for 10 percent of the total balance and the loss given default is 50 percent, then this would imply a five percent loss on the mortgage book. One could imagine more stressful scenarios than this.