Treasurer Jim Chalmers has launched a political broadside against the coalition, accusing it of planning a half-trillion-dollar hit to the budget bottom line.
Labor has found itself under increasing pressure in recent weeks over its decision to wind back tax concessions for investments in property, shares and trusts.
But costings released by Dr Chalmers show repealing the changes - as the coalition has promised - would cost the federal budget tens of billions of dollars in lost revenue.
