Impairment is defined in FRS11 as a reduction in the recoverable
amount of a fixed asset or goodwill below its carrying amount.
An impairment review should be carried out:
If an impairment loss is recognised, the revised carrying value, if being amortised, should be amortised over the current estimate of the remaining useful economic life.
Details of how an impairment review is to be carried out are at CIRD30555. These apply except for the end of the first year review. This review can be carried out in two stages. The first stage compares post-acquisition performance with pre-acquisition forecasts used to support the purchase price. Only if the performance has failed to meet expectations as shown in the initial review (or in the event of other unforeseen impairments) is the full impairment review (the second stage) in accordance with FRS11 required.