A former KPMG partner has joined widespread calls for a Royal Commission into the "Big Four" consultancies.

The global PwC tax leaks scandal has claimed its first government scalp with one of Australia’s most senior tax officials departing amid revelations by The Klaxon.

One of Australia’s most senior tax officials worked directly at PwC with at least two of the partners named in the consultancy giant’s tax leaks scandal.

The names of more than 50 PwC partners and staff who received or shared confidential Federal Government data in the tax leaks affair remain hidden.

The man who was CEO of consultancy PwC Australia for the entire tax payments affair, Luke Sayers, has exited as chair of a charity he runs with his wife.

A group of around 20 PwC partners are allegedly preparing to campaign the firm over a "lack of accountability" in tax leaks scandal.