Fearing an increase in capital gains and dividend taxes, many of the rich are unloading stocks, businesses and homes before the end of the year.

Wealth advisors say that with capital-gains taxes potentially going to 25 percent from 15 percent, and other possible increases in the dividend tax, estate tax and other taxes, many clients are selling now to save millions in taxes.

"Under almost any scenario, it makes sense to take the gains this year," said Gregory Curtis, chairman and managing director of Greycourt & Co. "Clients aren't selling willy nilly. But if they can and they have a huge gain, they're selling now."