The Australian Greens want negative gearing abolished and the billions in savings used to help pay for homes for the nation's most vulnerable.
The Greens have had the proposal to end the scheme on new housing investments costed by the independent Parliamentary Budget Office, arguing generous subsidies to investors have driven up the cost of housing.
'We don't think this should continue into the future,' deputy Greens leader Scott Ludlam said on Sunday.
A substantial part of the $2.9 billion saved within four years should be invested in new housing, he said, taking 15,000 families and individuals off the social housing waiting list over the same period.
The money would fund the construction of 7000 new homes for the homeless by 2020.
Over 10 years, the savings would amount to $42.5 billion.
Labor has previously said it would look at negative gearing.
But senior Labor frontbencher Anthony Albanese said on Sunday it wasn't just about tax.
'You would have to look as to whether any changes would have an impact in terms of supply, in terms of investment in housing,' he told Sky News.
Another opposition frontbencher Mark Butler said Labor was in discussion with housing experts and academics on how to improve housing affordability.
Property Council of Australia boss Ken Morrison said the Greens' proposal was 'dangerous' and would make housing affordability worse.
'Removing negative gearing would put the brakes on the supply of new housing and ... drive prices higher for both renters and home owners,' Mr Morrison said in a statement.
But Bank of America Merrill Lynch chief economist Saul Eslake said there was a lot to like about the plan.
'I've long argued that negative gearing costs a lot revenue and does not do what its supporters claim it does,' he told Sky News.
More than 90 per cent of geared investment goes to established properties and overwhelmingly inflates its price rather than adding to the stock of property, he said.
The proposal comes just days after Treasury boss John Fraser said that Sydney and wealthier parts of Melbourne were 'unequivocally' in a housing bubble - a situation Tony Abbott has played down while accusing Labor of trying to talk down the housing market.
Mr Butler said the prime minister has responded in the 'glibbest possible political terms'.
Assistant Treasurer Josh Frydenberg told ABC TV housing prices had gone up but they 'went up higher in the early 2000s'.
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