mattwnz: Maybe the government could do what they have just done with EV cars. Charge a levy on any house purchased by any investor. Then give a rebate back to people that build new. GST removal on new builds would also help , and also helps to get rid of old houses. The government was able to bring this sort of policy in for EVs and it wasn’t considered a new tax. But unfortunately too many people making decisions have vested interests in owning one or more houses
You are talking Stamp Duty. I feel that interest is a better option, the buyer (investor ir not) pays more every repayment. They builder gets a lower repayment every repayment. I dont like one off deals. Its small, one off, and done. Interest, is actually a much higher penalty/benefit
The EV thing is the "Ute Tax" :-)