Back to Negative Gearing

Just found some time to listen to the third leaders debate.

Scomo questions Bilsho asking if he will guarantee that if Bilsho becomes PM and implements NG and capital gains taxes, that rents won’t go up and prices won’t go down..

Under the two coalition government terms, without any changes to NG or capital gains tax, was he or the former leaders of the current government.able to guarantee or prevent rents going up or prices from going down??