What is useful life and how is it estimated?

Full Explanation

Useful life determines how long to project cash flows in valuation and how many years to amortise the asset on the balance sheet. Finite-lived intangibles are amortised; indefinite-lived assets (like established brands) are tested for impairment annually. Estimating useful life requires judgment: customer relationships might have a useful life of 5-7 years (accounting for churn and relationship degradation); developed technology might be 5-10 years (risk of obsolescence); brands might be indefinite if they have sustained competitive position. Legal or contractual terms can define useful life: a patent expires at a fixed date, so useful life is the shorter of patent life or economic life. For R&D, useful life is often 3-5 years because technology becomes obsolete quickly. Courts and auditors scrutinise useful life estimates because longer lives reduce annual amortisation charges and increase reported earnings. Conservative estimates (shorter useful lives) are more defensible. Useful life also affects valuation: a brand with indefinite useful life is worth more than one with 5-year useful life (all else equal). Companies should document their useful life assumptions and update them annually based on changes in technology, competition, or customer preferences.

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