Deep T: As the research previously posted here on MB shows, Mega Bank [the big four Australian banks: NAB, CBA, WBC and ANZ] carries a level of capital against residential mortgages that is less than 2% even with mortgage insurance. Mega Bank uses internal risk based models to determine the amount of capital which are primarily based on the historical default rate of Australian mortgages relative to loan to value ratios. The period over which Mega Bank assesses the historical default rate is primarily over a period of rising house prices fueled by the expansion of mortgage credit by Mega Bank. Thereby masking probable default levels over a more benign period…..