The objective of the audit was to examine how effectively Health manages the risk of PBS drugs not being used according to PBS subsidy conditions. The audit examined two areas: during listing, how Health identified and implemented measures to decrease the risks of PBS drugs being used outside subsidy conditions; and following listing, how Health confirmed that usage and expenditure on PBS drugs was consistent with estimates. The report examines selected approaches used by Health, which have evolved in recent years, to manage the risk of PBS drugs being used outside subsidy conditions. The report also acknowledges and describes the role of the expert committees. The scope of the audit was limited to PBS drugs for which Health pays a subsidy. The audit did not examine Health's role in educating consumers, prescribers, and other health professionals, or the implications of the Australia–United States Free Trade Agreement for the PBS. Additionally, the ANAO did not form an opinion on the success of Medicare Australia's compliance role. To form an opinion against the audit objective, the ANAO interviewed Health personnel, committee members and stakeholders, examined relevant documents and files, analysed drug usage and expenditure data, and attended a number of committee meetings. To assist the audit process, the ANAO selected a sample of eight drugs. The drugs were selected due to their high cost to the PBS and/or high usage, or because the drug has had a particularly interesting PBS history. The sample is not representative of all drugs on the PBS. In 2004–05, 15.3 million prescriptions were written for these eight drugs, with the Government subsidy totalling $1.05 billion.

The follow-up audit assessed the extent to which the Australian Taxation Office (ATO), Department of Health and Ageing (Health), and Medicare Australia had implemented the six recommendations from Audit Report No.47 2001–02, Administration of the 30 Per Cent Private Health Insurance Rebate. The audit also looked at: the implementation of some of the major suggestions for improvement in the original audit; and the current validity of some of the positive major findings from that audit. The audit found that the ATO, Health and Medicare Australia have acted upon the recommendations contained in Audit Report No.47 2001–02 and, overall, the administration of the Rebate is currently being undertaken effectively.

The objective of the audit was to assess whether selected Australian Government entities were effectively supporting their business requirements through planning for, and management of, the acquisition, disposal and use of their IPE assets. The audit reviewed each entity's policies and practices against a series of audit criteria across the following components of asset management: control environment; planning; acquisitions; operations; and disposals.

The objective of this follow-up audit was to examine the ATO's implementation of the 20 recommendations in: The Administration of Petroleum Excise Collections (Audit Report No.17, 2001(02); and The Administration of Tobacco Excise (Audit Report No. 55, 2001(02), having regard to any changed circumstances, or new administrative issues, affecting implementation of those recommendations. The audit also aimed to identify scope for improvement in the ATO's administration of petroleum and tobacco excise. Follow-up audits are recognised as an important element of the accountability processes of Commonwealth administration. The Parliament looks to the Auditor-General to report, from time to time, on the extent to which Commonwealth agencies have implemented recommendations of previous audit reports. Follow-up audits keep the Parliament informed of progressive improvements and current challenges in areas of Commonwealth administration that have previously been subject to scrutiny through performance audits.