What is goodwill, and how is it created?

Goodwill is an asset that only appears when one company buys another. It's the purchase price minus the fair value of the identifiable net assets acquired. In plain terms, it's what the buyer paid above what it can point to and put a value on. The steps matter. First the buyer marks the target's assets and liabilities to fair value, which often means writing up things like property. It also recognizes identifiable intangibles that weren't on the target's books, such as customer relationships, brands and patents. Whatever is left of the price after all that is goodwill. What it represents is the things you can't separate and sell: the workforce, expected synergies, growth the buyer is paying for in advance. A company can't book goodwill on itself. It has to come from a deal. Afterward, under US GAAP a public company doesn't amortize goodwill. It tests it for impairment at least once a year. If the acquired business is now worth less than its carrying value, goodwill is written down.

Goodwill is an asset that only appears when one company buys another. It's the purchase price minus the fair value of the identifiable net assets acquired. In plain terms, it's what the buyer paid above what it can point to and put a value on. The steps matter. First the buyer marks the target's assets and liabilities to fair value, which often means writing up things like property. It also recognizes identifiable intangibles that weren't on the target's books, such as customer relationships, brands and patents. Whatever is left of the price after all that is goodwill. Here's an example. A buyer pays $500 million for a company whose book equity is $200 million. At fair value, its plant is worth $50 million more than book, and it has $100 million of customer relationships that were never recorded. So identifiable net assets are $350 million and goodwill is $150 million. In a full model the write-ups also create a deferred tax liability, which adds to goodwill. I've left that out. What it represents is the things you can't separate and sell: the workforce, expected synergies, growth the buyer is paying for in advance. A company can't book goodwill on itself. It has to come from a deal. Afterward, under US GAAP a public company doesn't amortize goodwill. It tests it for impairment at least once a year. If the acquired business is now worth less than its carrying value, goodwill is written down. That's a non-cash charge that reduces net income, and it can't be reversed later. A large write-down usually means the buyer overpaid or the synergies didn't arrive.