Interest deductibility was still available on new builds, it was a worthy policy to encourage increase in housing stock rather than investors trading in existing housing stock, inflating prices.The books are bad - but keeping stupid legislation that makes the economy worse still needs fixing. And it’s not a tax cut, it’s the ability to claim a legitimate expense.
It’s like a drug addict saying we can’t go clean because it’s going to have short term bad consequences… CUT OUT THE FAILED EXPERIMENT.
No other country denies interest deductibility, it wasn’t supported by treasury or IRD and it has resulted in the predicted huge rental increases. It’s wrong and dud policy.