Goodwill Impairment

Goodwill is created in an acquisition when the buyer pays more than the fair value of the target's identifiable net assets — it captures intangibles like brand, customer relationships, and synergies. Unlike most assets, goodwill is not amortized under US GAAP; instead it must be tested for impairment at least annually (and whenever there's a triggering event like a sharp decline in performance, lost customers, or a falling stock price). Impairment happens when the acquired business underperforms the expectations baked into the purchase price — in plain terms, the acquirer overpaid or conditions deteriorated. Famous examples include AOL–Time Warner ($99B) and General Electric's serial impairments.

Under current US GAAP (ASC 350, simplified in 2017), a company performs a single-step quantitative test: compare the reporting unit's carrying value to its fair value. If carrying value exceeds fair value, the difference is the impairment loss — capped at the goodwill allocated to that unit (you can't impair goodwill below zero). Many companies first run an optional qualitative 'Step 0' to decide whether a quantitative test is even necessary. Critically, goodwill impairment is one-directional: once written down, it can never be written back up under GAAP, even if the business recovers.

On the income statement, the impairment is an operating expense that lowers pre-tax income and net income (it's often shown below the operating line and excluded from adjusted EBITDA). On the cash flow statement, it's a non-cash charge added back to net income — no cash moves. On the balance sheet, goodwill falls by the impairment amount and retained earnings fall by the after-tax charge, keeping the balance sheet in balance. Because it's non-cash and tied to a past deal, analysts typically add it back when assessing ongoing earnings power — but they also treat a big impairment as a signal that management overpaid.