Former PwC Australia chief executive Luke Sayers says a Senate committee made an unjustified personal attack upon him by calling aspects of his testimony about the firm’s tax leaks scandal “implausible” and “scarcely credible”.

In a report about the PwC tax leaks scandal, the committee said it was “concerned about the truthfulness of some of the evidence it has received and is left questioning the credibility of Mr Sayers’ evidence”.