Morgan has a new working paper titled “A Note on the Size Distribution of Irish Mortgages”. From the conclusions
Our analysis here has shown that instead of 10,000 million plus mortgages, there were probably fewer than 2,000 and these were mostly for investment rather than own home mortgages. However, looking at the 11,000 largest mortgages from the bubble peak of 2006-08, we find that the total is €9 billion. We do not know how many people held more than one mortgage, but it does not seem implausible that the total indebtedness of the 10,000 people with the largest mortgage debt is in the region of €10 billion.
Morgan uses statistical methods to estimate the number of mortgages valued at over €1 million because the Department of the Environment do not make these data available.
While the question of how many mortgages there are over €1 million is not particularly important, it might be worthwhile for the Central Bank or CSO to make available more detailed figures on the size distribution of mortgages. As there are quite a few banks in the Irish mortgage market, the usual argument about confidentiality hardly applies as an issue when releasing aggregate figures.