Meanwhile, Green Party co-leader Marama Davidson has gone further than her party's policy on a capital gains tax, saying she was open to a debate on whether it should apply to the family home.
Official Green Party policy is that any CGT would exclude any capital profit made on the sale of the family home.
Labour has the same policy, while New Zealand First has traditionally opposed to nay capital gains tax.
Davidson yesterday took aim at the "wealthy elite" and property speculators, telling a party policy conference in Wellington a CGT should be just the beginning of a wide-ranging reform of the tax system targeting the wealthy.
"The resistance to the capital gains tax by the wealthy elite, who often own multiple properties, shows that our political system is still held hostage by the people who benefit from an unregulated housing market," she said.
"The capital gains tax should be the beginning of a wide range of reforms to transform our tax system. The Greens have long called for a range of reforms, like increasing the tax rate for the richest 1 per cent and putting a tax on polluting big businesses and housing speculators," Davidson said.
The Taxpayers' Union said her comments yesterday were an insult to middle New Zealand.
"Ms Davidson either doesn't understand the proposed tax and hasn't read Dr Cullen's report, or she knows that in reality she is attacking middle New Zealanders, hundreds of thousands of whom will be whacked by the tax," Williams said in a statement.
