Dozens of PwC China partners have left their roles in recent month's wake of a ban over its audit of failed property developer Evergrande, reports London's Financial Times.

The firm's mainland China entity disclosed to a finance ministry database of certified public accountants in December and January that 66 people were "no longer partners," though it is unclear if they had already left the firm.

The disclosures are made whenever partners join or step aside from the partnership. A separate registry shows the mainland firm had 277 registered equity partners, including 65 of the departing partners, indicating a cut of more than 20 per cent.

The reduction in PwC China's partner ranks is the biggest in five years and comes after authorities imposed a six-month ban in September and fined the firm more than US$60 million for "concealing or even condoning" fraud during its audit of Evergrande.