What Is Asset Impairment?

Asset impairment is a permanent drop in the amount an asset can recover - through continued use or through sale - below the value it is carried at in the accounts. When that happens, accounting rules require the business to write the asset down to its recoverable amount and recognise the difference as an impairment loss. The key word is permanent: a temporary dip in fair market value is not impairment, and neither is the ordinary, scheduled loss of value that depreciation already covers.

What triggers an impairment review

Impairment is event-driven. The typical triggers are:

• Physical damage - flood, fire, a crash, or wear far beyond what was assumed
• Obsolescence - a machine or system superseded so thoroughly that nobody would buy it
• Market shifts - second-hand prices for that asset class falling sharply
• Changed plans - the asset is idle, the project it served was cancelled, or it will be disposed of well before the end of its useful economic life
• Legal or regulatory limits - new rules that restrict how the asset may be used

A trigger does not mean the asset is impaired. It means someone has to check.

The impairment test

The test compares two numbers. The first is the carrying amount - the asset’s book value, meaning cost minus accumulated depreciation. The second is the recoverable amount - the higher of what the asset would fetch if sold (fair value less selling costs) and what it is worth if kept in use (the value of the cash flows it will still generate).

If the recoverable amount is lower than the carrying amount, the difference is the impairment loss. It is charged to profit and the asset’s book value is reduced to match.

A worked example

A landscaping firm buys a tractor for €80,000 and depreciates it straight-line over 10 years with no residual value, €8,000 per year. After four years its book value is €48,000.

A flood then submerges the yard. After repairs, the tractor runs, but a dealer values it at €30,000 and the firm estimates it can still generate around €33,000 of value over its remaining working life. The recoverable amount is the higher of the two: €33,000. The impairment loss is €48,000 - €33,000 = €15,000. The tractor is written down to €33,000, and depreciation restarts from that figure over the remaining six years - €5,500 per year.

Impairment vs depreciation and write-offs

Depreciation is the planned schedule; impairment is the unplanned correction when reality breaks the schedule. The third sibling is the asset write-off: where impairment reduces an asset’s value partially while it stays in service, a write-off takes the value to zero because the asset is gone - stolen, destroyed or scrapped. A badly flood-damaged machine that still works gets impaired; one that goes to the breakers gets written off.

Spotting impairment in practice

Impairment reviews are only as good as the operational evidence behind them: finance cannot know a machine was damaged, has sat idle for a year, or has been patched up monthly unless those events are recorded against the asset. A register that keeps condition notes, damage reports and repair history on each record gives the review something concrete to work from - in AMPthilly, for instance, service desk tickets and their repair invoices stay attached to the asset permanently, so the candidates for a write-down identify themselves.

Related terms

• Residual Value - the end-of-life estimate that impairment events often force you to revisit
• Asset Write-Off - the full removal of value when the asset is gone, not just diminished
• Fair Market Value (FMV) - one half of the recoverable-amount comparison
• Asset Capitalisation - how the asset got its book value in the first place
• Useful Economic Life - the time horizon that both depreciation and impairment maths depend on