Just days after cutting ties with its CEO, KPMG faces the loss of a major corporate client with Lendlease triggering a process to end a relationship dating back to the 1950s.

KPMG Australia's boss has resigned after the firm admitted to severely mishandling a whistleblower report on client confidentiality breaches.

The whistleblower scandal at KPMG hit a new gear with the resignation of its CEO on Friday. But the saga hasn’t stopped the firm offering some advice.