Increasing the compulsory superannuation rate could disadvantage low-income earners and cut workers' lifetime income by 2 per cent, the much-anticipated retirement income review has concluded, opening the door for the Morrison government to delay or even scrap legislated rises.

The findings of the 10-month probe place a fresh focus on private property ownership as a key tenet of the retirement system, with home owners having better retirement outcomes than renters and more equity to draw down on in their old age.