Suspect banknotes that are turned in to or seized by state or federal police are examined by the Reserve Bank of Australia. Detail on each confirmed counterfeit is recorded and aggregated. Analysis on counterfeiting is provided in the Reserve Bank of Australia's Annual Report each financial year.

The table below contains data on the number of counterfeits detected in the previous financial year. Counterfeit data are also presented in a ‘parts per million (PPM)’ format to provide context when comparing counterfeiting in different periods. PPM means the number of counterfeits detected for every million banknotes in circulation.

Counterfeits Detected in 2017/18
$5 $10 $20 $50 $100 Total
Number 41 276 592 15,351 9,614 25,874
Nominal value ($) 205 2,760 11,840 767,550 961,400 1,743,755
Parts per million 0.2 2.0 3.5 21.6 28.2 16.4
* Figures are preliminary and subject to upward revision due to lags in counterfeit submissions to the Reserve Bank.

Historical counterfeiting data are published every six months and can be found on the RBA website.