The Commonwealth Auditor-General, through the ANAO, is the external auditor for ANSTO and its Australian-based subsidiaries. The auditors of ANSTO’s USA-based subsidiary, ANSTO Inc., are WIPFLi LLP. For the 2019–20 financial year, the ANAO contracted KPMG to assist with the external audits of ANSTO and its Australian-based subsidiaries. During the year, KPMG hosted ANSTO’s ‘whistleblower’ reporting service (FairCall).