It is sometimes necessary to establish the content of an Act at a specific point in time. For example, for auditing purposes you may need to check which tax rates applied at a certain time in the past, or indeed what the tax law was at the time before the introduction of GST.
This has been variously called: point in time, backdating or historical approach to legislation. You can use a mixture of print and online resources to update legislation to a particular point in time.
Legislation to a point in time
The most thorough method is to:
The Federal Register of Legislation, Victorian Legislation and Parliamentary Documents, Lawlex and LawNow include historical superseded compilations. (A compilation becomes superseded each time the act is amended.)
Search for Act by name or number and select View Series to see all previous compilations.
This website directs you to AustLII for Historical Acts from 1885-1995.