Scott Morrison isn't sure if his plan to help some Australians buy their first home more easily will increase house prices.
But the prime minister is confident the scheme won't push prices lower, arguing the same wouldn't be true if Labor's plans to reform housing tax breaks are fulfilled.
'It's difficult to say, it's difficult to say,' the prime minister said at a housing estate in Cadden, in western Sydney, when asked whether the plan could lead to price rises.
'But I do know this: Labor's housing tax will force the value of your home down.
'We want to see more first homebuyers in the market, absolutely, and we don't want to see people's house prices go down.'
Under the new home deposit scheme, the government would offer loan guarantees for first home buyers, allowing them to buy properties with deposits of just five per cent.
Scott Morrison visist a housing estate in Caddens, in the seat of Lindsday, after his election-changing policy was announced
The government is providing the National Housing Finance and Investment Corporation with $500 million to deliver the scheme, along with $25 million to set it up and research the housing market.
The prime minister said the plan would allow singles earning less than $125,000 a year and couples earning less than $200,000 a year to get into the housing market for the first time.
About 10,000 people are expected to benefit, which would have been about one in 11 new home-buyers in 2018.
But Mr Morrison says that's a current estimate and not a final figure, stressing the scheme will be aimed at low and middle income earners.
'The scheme will ultimately be determined by the number of loans approved by the lenders and the arrangements with the National Housing Finance and Investment Corporation.'
Labor has committed to matching the scheme, blunting the prime minister's pitch on housing affordability.
But Mr Morrison is eager for people to know that Labor wants to scrap another scheme that helps people save for their first home by withdrawing voluntary contributions to their superannuation.
'It's fine for Bill Shorten to try and mimic us, but what he can't mimic is our ability to implement policy, design policy and do it in a way that doesn't increase taxes,' said in a live Facebook video.
There were about 110,000 new home-buyers in Australia in 2018, the highest level in nine years, a fact that Mr Morrison has talked up in recent weeks.
But he insists it's the right time for extra support because it's never easy to get together a 20 per cent deposit.
'It is a big mountain to climb.'
Housing industry bodies the Property Council and Master Builders have backed the scheme.
The plan is based on another program already operating in New Zealand.
But across the Tasman, first home-buyers must save a deposit of 10 per
