Goodwill
The premium paid above the net asset value when buying another company — intangible value like brand and customers.
Goodwill = Acquisition price − Net asset value of the acquired company
Goodwill itself is neither good nor bad — it's the amount added on top when making an acquisition.
In plain terms
If Company A buys Company B, and B's net assets on the books are $10 billion but A pays $12 billion, the extra $2 billion paid is goodwill.
It's the "premium" paid for things that don't show up on the books but are still worth paying for, like the brand, customer relationships, or technology. That's why goodwill arises through acquisitions.
What it tells you
It shows how much of a premium the company paid when it acquired other companies in the past.
If goodwill makes up a large share of assets, it can also mean the company has grown through acquisitions rather than by building things itself.
Formula
Goodwill = Acquisition price − Net asset value of the acquired company (an intangible asset line on the balance sheet)
What high or low means
Goodwill itself is neither good nor bad — it's the amount added on top when making an acquisition.
That said, if it's very large, paying a high price for an acquisition may lower capital efficiency (ROIC) or carry the risk that the value gets written down later.
If an acquired business doesn't perform as expected, the premium paid (goodwill) has to be written down significantly in the accounts (this is called a "goodwill impairment"). A large loss can be recognized all at once, which can shake earnings.
If goodwill is a large part of assets, that much of the growth has leaned on acquisitions. Whether those acquisitions were worth the price shows up in ROIC and debt.
In 2000, AOL and Time Warner carried out what was then the largest merger ever. With expectations that AOL would be the winner of the internet era, an enormous premium (goodwill) was added on.
But the hoped-for synergies proved illusory, and in 2002 Time Warner recorded a goodwill impairment (write-down of asset value) of about $99 billion, among the largest ever. It's a textbook case of the risks of goodwill: a high premium came back as a huge loss alongside a struggling business.
Metrics to read alongside
See it in real stocks
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This explanation is for information and reference only and is not a recommendation to buy or sell any security. Investment decisions and their consequences are your own.