carried interest has to do with "income" received from partnerships. it's basically the way hedge funds can charge fees, take no investment from the partners, and claim that the should be taxed at the tax rate of the actual hedge fund. frankly it's complete bs and should be taxed at ordinary income. edit: it would be like a mutual fund manager charging 1% on the fund and then only paying a 15% tax rate on the fee because the fund only payed long term capital gains instead of the management fee being income which of course it is.