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Subsection 124-75(4) of the Income Tax Assessment Act 1997 requires a taxpayer who otherwise satisfies the business asset test or the same or similar purpose test to use the other (replacement) asset for 'a reasonable time' after they acquired it. What is 'a reasonable time' is an objective question and the answer depends on the facts of each particular case.

In applying the 'reasonable time test' to use of a replacement asset after its acquisition, care needs to be taken in cases where you continue to own the asset but a change occurs in its nature or use. For example, you might decide to turn a replacement rental property into your main residence. You need to ensure that the period of use of the new asset is of sufficient duration to be regarded as a reasonable time having regard to the entire period of its ownership.

Ken and Dave operate a bottling factory. A gas explosion destroys a machine in the factory and they replace it with new machinery. The machinery is used for three weeks before Ken and Dave decide to sell it to purchase a new building. The new machinery is used for its entire period of ownership (3 weeks) in the same business as the destroyed machinery. In these circumstances, the 3 week period is 'a reasonable time'.

Robert and Debbie own a harbour side rental property which is compulsorily acquired to make way for a monorail track. They buy an apartment as another rental property. After 5 years, Robert and Debbie make the apartment their main residence and live there for the next 8 years. The apartment is used for 'a reasonable time' for the same or a similar purpose as the harbour side property was used.