Peter Costello slammed government pledge for 'lower , simpler , fairer ' taxes . The former treasurer singled out Joe Josh Frydenberg 's 's proposed new bank tax and Hockey push for revenue from multinationals . Mr Josh Frydenberg 's hit back at Mr Costello , saying he wished he had the tax revenue the former treasurer had when the Coalition was last in power .
Peter Costello slammed government pledge for 'lower , simpler , fairer ' taxes . The former treasurer singled out Joe Hockey 's proposed new bank tax and Josh Frydenberg 's push for revenue from multinationals . Mr Hockey hit back at Mr Costello , saying he wished he had the tax revenue the former treasurer had when the Coalition was last in power .