The Australian Consumer Law is a single national law, so the core consumer guarantees and unfair contract terms rules apply identically in every state and territory. What differs is the enforcement body a customer complains to and the tribunal that hears a dispute, which shapes how you word your complaints and dispute clauses.
New South Wales consumers deal with NSW Fair Trading, and low-value disputes are heard in the NSW Civil and Administrative Tribunal (NCAT). Because NCAT handles consumer claims quickly and cheaply, NSW traders see disputes escalate faster, so a clear internal complaints step in your terms genuinely reduces tribunal filings.
Victoria operates through Consumer Affairs Victoria and the Victorian Civil and Administrative Tribunal (VCAT). Victoria has historically been the most active state on consumer enforcement, and businesses selling into Victoria should be careful that any cancellation fees or non-refundable deposits reflect genuine loss, since these are recurring targets for regulator action.
Queensland channels complaints through the Office of Fair Trading Queensland and the Queensland Civil and Administrative Tribunal (QCAT). Queensland's strong tourism and services economy means service-delivery guarantees under sections 60 to 62 come up often, so your terms should be specific about timing and what "reasonable time" means for your offering.
Western Australia administers the ACL through Consumer Protection WA within the Department of Energy, Mines, Industry Regulation and Safety, with disputes heard in the Magistrates Court or relevant tribunal. The substantive rights are the same, but the geographic spread of WA makes delivery and supply-timing clauses worth drafting carefully, because what counts as reasonable delivery differs between Perth and a remote regional customer.