"Complicated corporate tax rules will let Aol write off the full purchase price of Bebo if they declare it worthless and abandon the asset. With Aol’s effective tax rate of around 45%, that’s $380 million and change in their pocket in taxes that they’d be able to avoid. "A sale of Bebo would almost certainly be less attractive. If someone were to pay them $100 million for the service, which is optimistic, Aol could still offset the remaining $750 million as a tax loss. But it could only apply against long term capital gains, and Aol doesn’t have any to offset against. They’d have to carry that loss forward and hope for future gains to offset it against." - Alex Scrivener