Impairment

Impairment occurs when the amount an asset is carried at on a company's balance sheet exceeds its recoverable amount — the higher of what the asset could be sold for, or the value of the cash flows it is still expected to generate if kept and used. When that happens, accounting rules require the company to write the asset's carrying value down to its recoverable amount immediately, recognising the shortfall as an impairment loss on the income statement.

Companies are required to test certain assets for impairment whenever there is an indication their value may have fallen, and some assets, particularly goodwill, must be tested at least once a year regardless of whether there is any specific sign of trouble. Testing compares an asset's carrying value against its recoverable amount, usually estimated by forecasting the future cash flows the asset is expected to generate and discounting them back to a present value, or by reference to what similar assets are currently selling for in the market. If the recoverable amount comes in below carrying value, the difference is recorded as an impairment loss; if it comes in above, under most accounting standards no adjustment is made at all, since gains are not recognised the same way losses are.

Impairment is distinct from ordinary depreciation or amortization, which reduce an asset's book value on a predictable, scheduled basis over its useful life regardless of whether anything has actually gone wrong. Impairment instead captures an unscheduled, often sudden drop in value triggered by a specific event — a product becoming obsolete, a plant closure, a sharp fall in demand, or a change in the market the asset serves — that the normal depreciation schedule was never designed to anticipate.

Goodwill, the premium a company pays above the fair value of a target's identifiable net assets in an acquisition, is never depreciated or amortised on a schedule; instead it is only ever reduced through goodwill impairment, tested at least annually. A large goodwill impairment is usually a clear signal that an acquisition is not delivering the value the acquirer originally expected, which is why these write-downs attract close attention from investors and analysts whenever a company announces one.

An impairment loss reduces the carrying value of the affected asset on the balance sheet and is recognised as an expense on the income statement in the period it is identified, directly reducing reported profit for that period even though no cash actually changes hands at the moment the loss is recorded. Because impairment charges can be large, irregular and driven by estimates rather than transactions, analysts frequently strip them out when assessing a company's underlying, ongoing operating performance, while still treating a pattern of repeated impairments across several periods as a genuine red flag about the quality of a company's past investment decisions.

Accounting standards set out specific external and internal indicators that should trigger an impairment test even outside the mandatory annual goodwill review: a significant decline in an asset's market value beyond what would be expected from normal use or the passage of time, adverse changes in the legal or economic environment the asset operates in, evidence that an asset is becoming obsolete or physically damaged, or internal evidence that an asset's actual operating performance is running significantly worse than budgeted. A company is expected to monitor for these indicators continuously rather than waiting for a scheduled annual review, which is why an impairment charge can appear in any reporting period, not just at year-end, whenever one of these triggering events is identified. A sudden, large impairment that was not previously flagged as a risk can also raise questions about whether management was monitoring these indicators closely enough, or chose to delay recognising a known problem until it could no longer reasonably be avoided.