Hillary Clinton is proposing complex changes to the capital gains tax that will hit high-earners.

Clinton wants to have six capital gains tax rates for those in the wealthiest income tax bracket. For a single filer, that means the bracket includes those earning $411,500 a year. For married couples filing jointly, it means $464,850 a year. Assets sold within two years would be hit by a total 43.4 percent capital gains tax, with the rate falling for each additional year down to 23.8 percent for assets held for six years or more.

Ryan Ellis, tax policy director at Americans for Tax Reform, calls it "the most complex and Byzantine capital gains tax rate regime in history." Ellis adds, "By anyone's definition that's really stupid tax policy."

The tax gets even more complex when one considers those who aren't in the top income tax bracket. Taxpayers who hold their assets longer than a year might pay one of five rates, ranging from 0 to 23.8 percent.

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