IAS 36 Goodwill Impairment Testing

How is goodwill tested for impairment under IAS 36.99?
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IFRS

IAS 36 Goodwill — Core Rule

Under IAS 36 goodwill impairment testing, goodwill acquired in a business combination must be allocated to cash-generating units (CGUs) and tested for impairment annually — and whenever there is an indication of impairment — by comparing the CGU's carrying amount (including allocated goodwill) to its recoverable amount, with any shortfall recognised immediately in profit or loss and never reversed.

How IAS 36 Goodwill Works