What changed with ASU 2017-04 for goodwill impairment testing?

Full Explanation

Before ASU 2017-04, US GAAP required a two-step goodwill impairment test. Step 1 compared the fair value of the reporting unit to its carrying amount. If carrying exceeded fair value, Step 2 required a hypothetical purchase price allocation to determine the implied fair value of goodwill — essentially re-performing the entire PPA with current values. The impairment was the excess of recorded goodwill over implied goodwill. Step 2 was expensive, time-consuming, and often produced counterintuitive results. ASU 2017-04 (effective for public companies in fiscal years beginning after December 15, 2019, and for private companies after December 15, 2021) eliminated Step 2 entirely. Under the simplified approach, goodwill impairment is measured as the excess of the reporting unit's carrying amount over its fair value, with the impairment charge limited to the amount of goodwill allocated to that reporting unit. This reduces cost and complexity significantly — companies no longer need to perform a full hypothetical PPA every time fair value falls below carrying amount. The qualitative assessment option (ASU 2011-08) remains available, allowing companies to first assess whether it is more likely than not that fair value is less than carrying amount before performing the quantitative test. The simplified approach aligns US GAAP more closely with IFRS (IAS 36), though differences remain in the level at which testing is performed (reporting unit under US GAAP vs cash-generating unit under IFRS) and the prohibition against reversing goodwill impairment under both frameworks.

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