Corporations Act 2001
Despite any provision in this Act or any other Act, in any case where:
(a) the ACN of a company; or
(b) the ARBN of a registered body; or
(c) the ARSN of a registered scheme;
is required or permitted to be used under a law of the Commonwealth administered by ASIC or the Registrar, the ABN of the company, body or scheme may be used instead if the last 9 digits of the ABN are the same, and in the same order, as the last 9 digits of the ACN, ARBN or ARSN.