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TR 2018/4 discusses the methodology used by the Commissioner of Taxation in making a determination of the effective life of depreciating assets under section 40-100 of the Income Tax Assessment Act 1997 .

TR 2018/4 has been replaced by Taxation Ruling TR 2019/5, which applies from 1 July 2019. To the extent that the views contained in TR 2018/4 still apply, they have been incorporated into TR 2019/5.

The Commissioner has made a new determination of the effective life of certain depreciating assets which takes effect from 1 July 2019. This determination has been incorporated into Tables A and B in the Schedule to TR 2019/5.