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Testing a Long-Lived Asset for Impairment

When an asset's carrying value on the books can no longer be justified by the cash it will generate, GAAP forces a two-step test that ends in a write-down to fair value.

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Prerequisites: Reading a Balance Sheet, Depreciation and Amortization

A factory was built for $200 million and, after depreciation, sits on the books at $140 million. But the product it makes has fallen out of favor, and realistically the factory will never generate enough future cash to justify that $140 million carrying value. Accounting doesn't let the company just keep depreciating on the original schedule and pretend nothing happened — GAAP requires a specific test to catch this, and if the test fails, the asset gets written down immediately.

An asset's carrying value can't stay on the books above what it's actually worth to the business. The test compares carrying value to the undiscounted future cash flows the asset is expected to generate; if carrying value exceeds that, the asset is impaired, and the write-down is measured as carrying value minus fair value, hitting the income statement immediately as a loss.

The two-step test

Step 1 — recoverability. Compare carrying value to the sum of expected future cash flows, undiscounted (no present-value adjustment — just add up raw dollar amounts over the asset's remaining life). If carrying value is less than or equal to that sum, no impairment — the asset can still "earn back" its book value, even slowly.

Step 2 — measurement. If carrying value exceeds undiscounted cash flows, step 1 fails and the asset must be written down. The write-down isn't measured against those cash flows — it's measured against fair value (what the asset could be sold for). The loss is carrying value minus fair value, recognized immediately.

carrying value \$140m undiscounted CF \$100m shortfall step 1 fails: \$100m < \$140m carrying value step 2: write down to fair value, e.g. \$90m impairment loss = 140 − 90 = \$50m, hits income statement now
Failing step 1 doesn't set the write-down amount — it just triggers step 2, which measures the loss against fair value, not against the cash flow estimate that failed the test.

Worked example

The factory has a $140 million carrying value. Management estimates it will generate $18 million a year of cash flow for the next 6 remaining years of its useful life.

  1. Undiscounted future cash flows: 18×6=10818 \times 6 = 108, i.e. $108 million.
  2. Step 1 test: $108 million (undiscounted cash flows) is less than $140 million (carrying value) — the asset fails the recoverability test.
  3. Step 2: An appraisal estimates the factory's fair value — what it could be sold for today — at $95 million.
  4. Impairment loss: 140−95=45140 - 95 = 45, i.e. $45 million, recognized immediately as a loss on the income statement. The asset's new carrying value going forward is $95 million, and future depreciation is based on that lower amount.

What this means in practice

Impairments are non-cash charges — no cash leaves the company when the write-down is booked — but they signal that management's prior estimates, or the market for the asset, have deteriorated. Analysts exclude impairments from normalized earnings but track their frequency as a check on whether management has been overly optimistic in prior capital allocation.

Because step 1 uses undiscounted cash flows, an asset can pass step 1 (avoiding any write-down at all) even though a proper present-value analysis would say it's worth far less than its carrying value — the undiscounted test is deliberately more forgiving, so "no impairment recorded" doesn't always mean the asset is truly worth its book value in an economic sense.

Related concepts

Practice in interviews

Market Making →Mental Math →

Further reading

  • FASB ASC 360, Property, Plant and Equipment — Impairment
  • Wild, Subramanyam & Halsey, Financial Statement Analysis (ch. on asset impairment)
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