Never a good idea for a public policy measure to directly incentivise people to maintain mortgage borrowings on their homes.
I don't disagree with the statement made in principle. However public policy is frequently balancing at times what appears to be irreconcilable and unpleasant alternatives, competing objectives, etc.
Should not be a free for all re mortgages, with proper controls, etc would be a better measure of wealth. Would need controls wrapped around it to prevent abuse or excesses, the mansions, people increasing mortgages to reduce LPT.
Fair to say that the gross value of a house is not (in isolation) representative of someone's wealth, if that was the case then most of the wealthy people in Ireland would live in Dublin. I don't think they do. What I am saying is that for the average Joe soap their mortgage is one consideration to be taken account of when calculating LPT. Should also consider ability to pay, etc.
Of course not an easy one, but the current approach is crude and unfairly penalising people simply based on where they live. LPT is really supposed to be a wealth tax, how it is charged is not representative of a true measure of wealth.