Long-Lived Asset Impairment Under US GAAP: The Two-Step Test Explained

The US GAAP impairment model for long-lived assets is one of the framework’s most distinctive features — and a major difference from IFRS. Its two-step test, built around an undiscounted cash flow screen, means impairments are recognised less readily than under IFRS, and once recognised they are never reversed. This guide explains the recoverability test, loss measurement, asset groups, and why the US GAAP model produces different results from IFRS.

When is a long-lived asset tested for impairment?

Under ASC 360, a long-lived asset (or asset group) held and used is tested for impairment whenever events or changes in circumstances indicate that its carrying amount may not be recoverable. Indicators include a significant decrease in market price, an adverse change in the manner or extent of use, an adverse change in legal factors or business climate, cost overruns on construction, current-period operating or cash flow losses combined with a history or forecast of continuing losses, and a more-likely-than-not expectation of early disposal.

Unlike goodwill and indefinite-lived intangibles, long-lived assets such as property, plant and equipment and finite-lived intangibles are not subject to a mandatory annual impairment test; they are tested only when such indicators arise. This indicator-driven approach means companies must actively monitor for triggering events, and a careful assessment of indicators each period is the gateway to the impairment test itself.

How does the step-one recoverability test work?

Step one is the recoverability test, and its distinctive feature is the use of undiscounted cash flows. The asset or asset group is considered recoverable — and therefore not impaired — if the sum of the undiscounted future cash flows expected from its use and eventual disposal equals or exceeds its carrying amount. Only if the carrying amount exceeds these undiscounted cash flows does the asset fail step one and proceed to loss measurement.

Because undiscounted cash flows are typically much higher than discounted ones, this test sets a deliberately high threshold. An asset can have a carrying amount above its discounted recoverable value yet still pass step one because its undiscounted cash flows exceed carrying amount. This means US GAAP recognises impairments of long-lived assets less readily than IFRS, which compares carrying amount directly with a discounted recoverable amount. The undiscounted screen is unique to US GAAP and is a defining feature of the model.

How is the impairment loss measured in step two?

If an asset or asset group fails the step-one recoverability test, step two measures the impairment loss as the amount by which the carrying amount exceeds the asset’s fair value. Note the shift: step one uses undiscounted cash flows as a screen, but step two measures the loss using fair value, which reflects market participant assumptions and is typically determined using discounted cash flows or market evidence under the fair value framework in ASC 820.

This two-measure structure — undiscounted cash flows to decide whether there is impairment, fair value to measure how much — is characteristic of US GAAP. Once recognised, the impairment establishes a new, lower cost basis for the asset, which is then depreciated over its remaining useful life. The loss is recognised in the income statement, usually within operating results, and it permanently reduces the asset’s carrying amount, since reversal is not permitted.

Why does US GAAP prohibit impairment reversals?

For long-lived assets held and used, US GAAP does not permit reversing a previously recognised impairment loss, even if the asset’s value subsequently recovers. The written-down amount becomes the new cost basis, and the asset is depreciated from there. This contrasts sharply with IFRS, which requires reversing an impairment loss (other than goodwill) when the estimates used to measure recoverable amount change favourably.

The no-reversal rule makes US GAAP more conservative on recovery: a rebound in value benefits future periods through lower depreciation on the reduced base, rather than reversing the earlier loss. For cyclical, asset-heavy industries such as energy, manufacturing, and shipping, this is a meaningful difference, because IFRS balance sheets can recover with the cycle while US GAAP balance sheets cannot. The combination of the undiscounted screen and the no-reversal rule gives US GAAP long-lived asset impairment a distinctive character, explored from the IFRS side in our IFRS hub.

How do asset groups and order of testing matter?

Long-lived assets that do not generate independent cash flows are tested within asset groups — the lowest level for which cash flows are largely independent. The identification of asset groups is a critical judgment that determines where impairments fall, analogous to cash-generating units under IFRS. When an asset group is tested, there is also a prescribed order: other assets are tested for impairment under their own standards first, and the long-lived asset impairment is then allocated to the assets in the group on a pro rata basis, but not below their individual fair values.

Where goodwill is also present, the interaction between long-lived asset impairment under ASC 360 and goodwill impairment under ASC 350 must be handled in the correct sequence, with long-lived assets generally tested before goodwill. Getting the asset group definition and the order of testing right is essential to a correct impairment conclusion, and these are areas where the detailed, rules-based nature of US GAAP requires careful application to avoid both understating and misallocating impairment losses.

How do you identify and assess impairment indicators?

Because long-lived assets are tested only when indicators arise, the assessment of impairment indicators each period is the critical gateway to the impairment test. ASC 360 lists indicators including a significant decline in the asset’s market price, a significant adverse change in the extent or manner of use or in its physical condition, a significant adverse change in legal factors or business climate, an accumulation of costs significantly above the amount originally expected to acquire or construct the asset, current-period operating or cash flow losses combined with a history or projection of continuing losses, and a more-likely-than-not expectation of disposal before the end of the asset’s useful life.

Identifying these indicators requires active monitoring of both external conditions and internal performance, and the assessment should be documented each period. Missing an indicator can mean failing to test an asset that is genuinely impaired, while a careful indicator assessment ensures the test is performed when it should be. For asset-heavy businesses, building a systematic process to review indicators across the portfolio each period is part of disciplined impairment management, and it determines whether the two-step test is triggered at all.

How does the model affect cyclical and asset-heavy businesses?

The US GAAP long-lived asset impairment model has a particular character for cyclical and asset-heavy businesses such as energy, mining, manufacturing, and shipping. The undiscounted cash flow screen in step one means that during downturns, assets may pass the recoverability test and avoid impairment even when their discounted value has fallen below carrying amount, so impairments are recognised less readily than under IFRS. But when assets do fail the high undiscounted threshold, the resulting impairment is often large.

The no-reversal rule then means that, unlike under IFRS, a recovery in the cycle does not reverse the impairment; instead, the benefit comes through lower depreciation on the reduced carrying amount. This produces a more conservative, less volatile pattern on recovery than IFRS, where impairments can be reversed as conditions improve. For multinational groups operating across both frameworks, these differences can produce materially different impairment outcomes for the same assets, requiring careful explanation, a contrast developed from the IFRS side in our IFRS hub.

How should long-lived asset impairment be governed and documented?

Because long-lived asset impairment is judgmental and can be material, it warrants disciplined governance and documentation. Leading practice includes a defined process for identifying impairment indicators each period, documented identification of asset groups, supportable undiscounted cash flow forecasts for the step-one test, and, where step two is reached, robust fair value measurements consistent with the ASC 820 framework. The assumptions underlying the cash flow forecasts should be consistent with budgets and with assumptions used elsewhere in the financial statements.

Documentation is particularly important because the undiscounted screen is a high threshold, so the decision about whether an asset group passes or fails step one is consequential, and auditors compare prior forecasts with actual results. A well-governed process produces an audit trail that supports the impairment conclusion, whether that is no impairment or a significant loss. For asset-heavy businesses, treating impairment as a controlled, documented process rather than an annual judgment call gives stakeholders confidence that asset values are supportable, reflecting the controls culture this hub emphasises across every standard.

What is the practical takeaway on US GAAP versus IFRS impairment?

The practical takeaway is that long-lived asset impairment is one of the areas where US GAAP and IFRS genuinely diverge, and the differences matter for analysis, comparison, and cross-border groups. US GAAP’s two-step model, with its undiscounted cash flow screen and no reversals, recognises impairments less readily and, once recognised, leaves them in place. IFRS compares carrying amount with a discounted recoverable amount and permits reversals (except goodwill), so it impairs sooner and can recover with the cycle.

For a multinational group reporting under both frameworks, or an analyst comparing companies across them, this means the same assets can carry materially different values, and impairment charges can arise at different times and in different amounts. The disciplined approach is to understand which framework applies, recognise that impairment conclusions are not directly comparable, and adjust accordingly. This divergence, alongside the differences in inventory, revaluation, and other areas, reinforces that US GAAP and IFRS are related but distinct frameworks that must each be understood on their own terms, as developed throughout this hub and our IFRS hub.

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