[2] Following the 2013 election he was sworn into the cabinet as the Minister for Small Business (including responsibility for competition policy and consumer affairs).

[4] In August 2017, Billson admitted he had received a salary from the FCA several months before his retirement, which he had not declared on the register of members' interests.

The issue was also referred to an inquiry conducted by the House of Representatives' Standing Committee of Privileges and Members' Interests which concluded “it (had) received no clear evidence that Mr Billson had been improperly influenced in the performance of his duties as a Member…and that no finding of contempt could be made”.

It recommended in March 2018 that Billson be censured for failing to disclose receiving a salary for the FCA, and for undertaking work for the organisation through his consultancy business before leaving parliament.

[8] Beginning 11 March 2021 he took up a government role as the Australian Small Business and Family Enterprise Ombudsman, replacing Kate Carnell.