What is a Goodwill Impairment?

Goodwill is the premium a buyer pays above the measurable value of a company's parts, because a working business is worth more than its machines. An impairment is the buyer later admitting the premium is no longer worth it. No cash moves; the asset shrinks and earnings take the loss.

When one company buys another, the price almost always exceeds the total of everything you can individually value: buildings, equipment, cash, patents. The excess is the price of the business being more than the sum of its parts: the brand people trust, the customer relationships, the trained team, and the future earnings they should generate. It sits on the buyer's books as an asset called goodwill, and it is tested yearly: does the acquired business still earn enough to justify that number? When expected earnings fall, because customers drifted or the promised synergies never appeared, the answer becomes no, even though the machines are worth exactly what they always were. Goodwill is then written down, shrinking the asset and booking the drop as a loss on that year's earnings. No cash leaves, that money left at the acquisition years earlier, but markets read the write-down as a verdict on the deal; the record is AOL Time Warner's $99 billion charge in 2002.

You buy a beloved neighborhood restaurant for $300,000 when the ovens, furniture, and lease appraise at $200,000. The extra $100,000 is not a mistake: the name, the regulars, and the recipes genuinely earn money the equipment alone never could. Two years later a rival opens across the street and the crowds thin. The ovens still appraise at $200,000, but the name no longer fills the room, and honest bookkeeping makes you cross part of that extra $100,000 out.