Intangible assets are initially recognised at cost.
Following initial recognition, intangible assets are stated at cost less accumulated amortisation and any accumulated impairment losses.
Amortisation is charged to profit or loss on a systematic basis over the estimated useful economic life of the asset. The useful lives and amortisation methods are reviewed annually and adjusted prospectively if appropriate.
Intangible assets are tested for impairment whenever there is an indication that the asset may be impaired, and at least annually where the asset is not yet available for use.
Patents and licences are being amortised evenly over their estimated useful life of nil years.