How are useful lives determined for intangible assets after an acquisition?

Full Explanation

Determining the useful life of an intangible asset is one of the most consequential judgements in purchase price allocation because it directly affects the annual amortisation charge and, therefore, reported earnings for years after the acquisition. Both IFRS and US GAAP require that the useful life reflect the period over which the asset is expected to contribute to the entity's cash flows.

For contractually-based intangibles, the useful life often aligns with the contract term. A technology licence with 8 years remaining has an 8-year useful life. However, if renewal is expected and can be achieved at minimal cost, the useful life may extend beyond the current contract term. Customer relationships are typically assessed using historical attrition analysis — if customer churn is 15% annually, the useful life might be estimated at 6-8 years (capturing the period over which a significant majority of current customers are retained).

Technology assets require judgement about obsolescence. Software in a rapidly evolving field might have a 3-5 year useful life, while a foundational algorithm in a stable domain might last 10-15 years. Brand names can have indefinite useful lives if there is evidence the brand will continue to generate economic benefits for the foreseeable future — in which case they are not amortised but tested annually for impairment.

Factors that shorten useful life include: rapid technological change, low switching costs for customers, regulatory changes, competitive intensity, and dependency on specific individuals. Factors that extend useful life include: strong legal protection (patents, long-term contracts), high switching costs, network effects, and continuous investment in the asset. The chosen useful life must be disclosed and supported by analysis that auditors can verify.

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