Hi Sarenco! This post represents a reasonably fair reflection of the actual cost to the Banks. However the figures exclude any loan loss provision reserve. I do acknowledge that potential for loan losses on new loans will be much lower than those on historic cases given the changes in asssessment and approval processes.
However if you take the figures given by you as being the average marginal cost to the bank of a new loan and 4.5% being the average gross interest return then the annual return to the bank on a loan of 100k is 1,860. However, if during the year the bank suffered a bad debt of 10,000 on its' mortgage book (small enough) that bad debt is the equivalent interest return on 537, 000 of good lending. I.e. The bank is only making profit on its' loan book if it can maintain loan losses at below 1.86%. Given the historic position and continuing losses on the basis of Court procrastination on reposessions and costs of same, I would find it hard to make a case that any bank is making money on its mortgage book!!!