INCOME TAX ASSESSMENT ACT 1997
You work out the decline in value of a *depreciating asset for an income year using the diminishing value method in this way:
Asset's *effective life
base value is:
(a) for the income year in which the asset's *start time occurs - its *cost; or
(b) for a later year - the sum of its *opening adjustable value for that year and any amount included in the second element of its cost for that year.
days held is the number of days you *held the asset in the income year from its *start time, ignoring any days in that year when you did not use the asset, or have it *installed ready for use, for any purpose.
If you recalculate the effective life of a depreciating asset, you use that recalculated life in working out your deduction.
You can choose to recalculate effective life because of changed circumstances: see section 40-110. That section also requires you to recalculate effective life in some cases.
The effective life of a vessel can change in some cases: see subsection 40-103(2).
You cannot use the *diminishing value method to work out the decline in value of:
(a) *in-house software; or
(b) an item of *intellectual property (except copyright in a *film); or
(c) a *spectrum licence; or
(d) a *datacasting transmitter licence; or
(e) a *telecommunications site access right.
The decline in value of a *depreciating asset under this section for an income year cannot be more than the amount that is the asset's *base value for that income year.