GAAP vs IFRS Impairment Testing: The Undiscounted Screen Gap

Key Takeaways

• GAAP vs IFRS impairment testing: GAAP's two-step test uses undiscounted cash flows as the first screen, so many assets that would be written down under IFRS survive intact under US GAAP.
• In the worked example, the same $500 million production line escapes impairment under ASC 360 (undiscounted cash flows of $600m beat the carrying amount) but requires a $90 million write-down under IAS 36 (recoverable amount of $410m).
• IFRS CGUs are typically narrower than GAAP reporting units, making it easier for IFRS to find impairment inside a mixed-performance portfolio where healthy assets would otherwise mask a troubled unit.
• The tax effect often moves in the opposite direction from the headline write-down, deferred tax asset creation can partially offset the income statement charge and is easily missed.

What It Is

Impairment testing asks whether the carrying amount of an asset on the balance sheet is still supportable by what the asset will earn or sell for. If it is not, the asset is written down and a loss hits the income statement.

IAS 36 is the IFRS standard covering impairment of PP&E, intangibles, and goodwill. ASC 360 covers long-lived assets under US GAAP, while ASC 350 governs goodwill and indefinite-lived intangibles. The two regimes share the same objective but use different mechanics, different measurement bases, and (as a separate article covers) different rules on whether a write-down can be reversed.

The Intuition

An asset sitting on the books at $100 million is a promise: management claims it will produce at least $100 million of value through use or sale. When that promise becomes doubtful, the accounts should catch up.

The question is how strict the test should be. IFRS sets a tight bar: compare the carrying amount directly to the best estimate of recoverable value, discounted. GAAP sets a looser initial bar: if the raw, undiscounted sum of expected cash flows beats the carrying amount, the asset is fine, even if fair value is lower. Only if that first screen fails does GAAP move to a fair-value measurement of the loss.

Because undiscounted cash flows will always exceed discounted cash flows over long horizons, the GAAP screen lets some assets escape write-down that IFRS would hit. This is why US filers sometimes carry PP&E at higher balance-sheet values than IFRS peers with identical economics.

How It Works

IAS 36 (one-step):

Recoverable amount = max(
  fair value - costs of disposal,
  value in use
)
Impairment loss = carrying amount - recoverable amount, if positive

Value in use is the present value of future cash flows from the asset's continued use and eventual disposal, discounted at a pretax rate that reflects current market assessments of time value and asset-specific risks. If either leg of the "max" beats the carrying amount, no loss. Otherwise the shortfall is booked.

ASC 360 (two-step for long-lived assets to be held and used):

Step 1 (recoverability): compare undiscounted expected cash flows
  to the carrying amount. If undiscounted CF >= carrying amount, STOP.
Step 2 (measurement): only if Step 1 fails,
  measure loss = carrying amount - fair value.

Goodwill follows a separate path on both sides. Under ASC 350, a public company tests goodwill annually at the reporting-unit level, with an optional qualitative screen and a quantitative test that compares reporting-unit fair value to its carrying amount (including goodwill). The 2017 simplification (ASU 2017-04) removed the old Step 2 goodwill computation. Under IAS 36, goodwill is tested annually at the cash-generating unit (CGU) level using the same one-step recoverable-amount model as other assets.

The level of aggregation also differs. GAAP reporting units can be larger than IFRS CGUs, which tend to be defined as the smallest identifiable group of assets generating largely independent cash inflows. Smaller units make it easier to find impairment inside IFRS.

Worked Example

A manufacturer holds a production line on its books at $500 million. Management forecasts $60 million of annual net cash flows for 10 years, with a terminal disposal value of $0. Its appropriate discount rate is 8%. Independent appraisers estimate fair value less costs to sell at $410 million.

Undiscounted cash flows (10 x $60m):     $600 million
Discounted value in use (at 8%):         ~$403 million
Fair value less costs of disposal:       $410 million
Carrying amount:                         $500 million

Under ASC 360: Step 1 compares $600m undiscounted to $500m carrying. $600m >= $500m, so no impairment. The asset stays at $500m.

Under IAS 36: recoverable amount is the higher of $410m (fair value less costs of disposal) and $403m (value in use), so $410m. Carrying amount of $500m exceeds recoverable amount by $90m. An impairment loss of $90 million is recorded.

Same asset, same cash flows, same market. Different standard, different answer.

Common Mistakes

1. Comparing pretax operating income across regimes during impairment cycles. Downturns tend to produce larger, earlier write-downs at IFRS filers. A US peer reporting stable operating income in the same environment may simply be passing the undiscounted-cash-flow screen, not actually outperforming.

2. Conflating CGU with reporting unit. The IFRS CGU is often narrower than the GAAP reporting unit. An analyst who tries to line them up one-to-one will misunderstand where management looked for impairment and where it found none.

3. Missing triggering events in GAAP. ASC 360 does not require an annual test for long-lived assets held and used; it requires testing only when events or changes in circumstances suggest the carrying amount may not be recoverable. Companies have discretion over whether a trigger occurred.

4. Treating value in use as DCF valuation. IAS 36 restricts the cash flows to the asset in its current condition. Planned improvements, uncommitted capex, and restructuring cash flows are excluded. A management DCF for internal capital planning is not the same number as IAS 36 value in use.

5. Ignoring the tax effect. Impairment losses are book, not necessarily tax-deductible in the same period. Deferred tax asset or liability movements often accompany the headline write-down and can flip the net P&L impact materially.

Frequently Asked Questions

Q: What is the GAAP vs IFRS impairment testing difference in simple terms? IFRS uses a one-step test: compare the asset's carrying amount directly to its estimated recoverable value (discounted). GAAP uses a two-step test: first check undiscounted cash flows against carrying amount; only if that fails does the second step measure actual loss using fair value. Because undiscounted cash flows are always higher than discounted ones, GAAP's first hurdle is easier to clear.

Q: How does the impairment testing difference affect investment decisions? US companies can carry assets at higher book values during economic downturns than IFRS peers with identical economics. That makes US balance sheets look more robust in stress periods. An investor comparing asset impairment cycles across the two frameworks must account for the structural tendency of GAAP to delay write-downs.

Q: What is a real-world example of the testing difference? In the worked example, a $500 million production line passes the US GAAP undiscounted test ($600m > $500m) but fails the IFRS test because discounted value-in-use is only $403 million. Under IAS 36, a $90 million impairment is recorded immediately. Under ASC 360, nothing happens, the same asset, same cash flows, different accounting outcome.

Q: How can investors adjust for the difference when comparing US and non-US companies? Look for IFRS companies with recent impairment charges in comparable industries, then check whether US GAAP peers have disclosed any "triggering events" or qualitative goodwill assessment outcomes. If an IFRS peer has taken a write-down, ask whether the US company's assets face the same economics and why no charge has been recognized.

Q: How is GAAP vs IFRS impairment testing different from goodwill impairment? For long-lived PP&E, GAAP uses the two-step undiscounted screen described here. For goodwill, GAAP has a separate standard (ASC 350) that directly compares reporting-unit fair value to carrying amount, no undiscounted screen. IFRS uses the same one-step recoverable-amount model for all assets, including goodwill. The goodwill rules are covered separately in the companion articles on goodwill impairment.

Sources

1. IFRS Foundation. "IAS 36 Impairment of Assets." https://www.ifrs.org/issued-standards/list-of-standards/ias-36-impairment-of-assets/
2. FASB. "ASC 360, Property, Plant, and Equipment." https://asc.fasb.org/360/tableOfContent
3. FASB. "ASC 350, Intangibles - Goodwill and Other." https://asc.fasb.org/350/tableOfContent
4. KPMG. "Goodwill impairment: IFRS Accounting Standards vs US GAAP." https://kpmg.com/us/en/articles/2022/goodwill-impairment-ifrs-standards-us-gaap.html
5. Deloitte DART. "2.5 Measurement of an Impairment Loss (Roadmap)." https://dart.deloitte.com/USDART/home/codification/presentation/asc205-20/roadmap-disposals-long-lived-assets-discontinued-operations/chapter-2-long-lived-assets-classified/2-5-measurement-an-impairment-loss

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.