Effective November 1, 2008, IP Australia (IPAU) is available to act as both International Searching Authority (ISA) and International Preliminary Examination Authority (IPEA) for most international applications filed with the USPTO under the Patent Cooperation Treaty (PCT).

Applicants who select Australia as the ISA will pay a search fee of US$1514, which is less than the current USPTO search fee of US$1800. Other available searching authorities for U.S. applicants are the EPO (current fee is US$2665) and the Korean Intellectual Property Office (current fee is US$244).