Department of Transport Annual Report 2010 - 2011

(f) Property, plant and equipment and infrastructure
Capitalisation/expensing of assets
Items of property, plant and equipment and infrastructure costing $5,000 or more are
recognised as assets and the cost of utilising assets is expensed (depreciated) over their
useful lives. Items of property, plant and equipment and infrastructure costing less than
$5,000 are immediately expensed direct to the Statement of Comprehensive Income.
Initial recognition and measurement
All items of property, plant and equipment and infrastructure are initially recognised
at cost.
For items of property, plant and equipment and infrastructure acquired at no cost or for
nominal cost, the cost is their fair value at the date of acquisition.
Subsequent measurement
Subsequent to initial recognition as an asset, the revaluation model is used for the
measurement of land and buildings, and the cost model for all other property, plant,
equipment and infrastructure. Land and buildings are carried at fair value less
accumulated depreciation (buildings only) and accumulated impairment losses. All
other items of property, plant, equipment and infrastructure are stated at historical cost
less accumulated depreciation and accumulated impairment losses.
Where market-based evidence is available, the fair value of land and buildings is
determined on the basis of current market buying values determined by reference to
recent market transactions.
Where market-based evidence is not available, the fair value of land and buildings
is determined on the basis of existing use. This normally applies where buildings
are specialised or where land use is restricted. Fair value for existing use assets is
determined by reference to the cost of replacing the remaining future economic benefits
embodied in the asset, i.e. the depreciated replacement cost.
When buildings are revalued, the accumulated depreciation is eliminated against the
gross carrying amount of the asset and the net amount restated to the revalued amount.
Independent valuations of land and buildings are provided annually by the Western
Australian Land Information Authority (Valuation Services) and recognised annually to
ensure that the carrying amount does not differ materially from the asset’s fair value at
the end of the reporting period.
The most significant assumptions in estimating fair value are made in assessing whether
to apply the existing use basis to assets and in determining estimated useful life.
Professional judgement by the valuer is required where the evidence does not provide a
clear distinction between market type assets and existing use assets.
Refer to note 21 Property, plant, equipment, vehicles and vessels for further information
on revaluations.
Derecognition
Upon disposal or derecognition of an item of property, plant and equipment, any
revaluation surplus relating to that asset is retained in the asset revaluation surplus.
Asset revaluation surplus
The asset revaluation surplus is used to record increments and decrements on the
revaluation of non-current assets as described in note 21 Property, plant, equipment,
vehicles and vessels.
Depreciation
All non-current assets having a limited useful life are systematically depreciated over
their estimated useful lives in a manner that reflects the consumption of their future
economic benefits.
Land is not depreciated. Depreciation on other assets is calculated using the straight
line method, using rates which are reviewed annually. Estimated useful lives for each
class of depreciable asset are:
Buildings 40 years
Computer hardware 4 to 7 years
Refurbishments, furniture and fittings 3 to 20 years
Maritime infrastructure 5 to 100 years
Plant and equipment 5 to 20 years
Vehicles 5 to 20 years
Vessels 10 years
Leased plant, equipment and vehicles 2 years
Assets under construction are not depreciated until commissioned.
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