Former assistant treasurer Michael Sukkar has rejected calls for the government to stop consulting PwC on tax policy after breaches of confidentiality by PwC partners, saying that disciplinary action should be targeted at individuals rather than the big four firm.

Mr Sukkar, who worked for PwC in 2005 to 2006, oversaw the cementing of the firm as the government’s dominant outside adviser on tax policy during the three years he was assistant treasurer until May last year.