Finance Minister Mathias Cormann would not repeat Malcolm Turnbull's assertion that "increasing capital gains tax is no part of our thinking whatsoever". Credit:Alex Ellinghausen

Given Mr Turnbull had asserted on Monday that "increasing capital gains tax is no part of our thinking whatsoever", Mr Shorten asked on Tuesday how Australia's can "trust this PM when he says one thing and does something else?"

Mr Turnbull, who is under mounting pressure to outline the government's tax reform plans after Labor unveiled a bold policy to change the rules on negative gearing tax and reduce capital gains tax breaks, said he would make the differing stances "crystal-clear".