from Taxes on Income and Capital Gains for 2014
Long-term capital gains and qualified dividends
A top rate of 15% applies to qualified dividends and the sale of most appreciated assets held over one year (28% for collectibles and 25% for depreciation recapture) for single filers with taxable income up to $406,750 ($457,600 for married filing jointly). Long-term capital gains or qualified dividend income over that threshold are now taxed at a rate of 20%.
EXAMPLE: If a married couple already has $457,600 of taxable income and an additional $100,000 in long-term capital gains and qualified dividends, the entire $100,000 would be subject to the 20% rate. If, however, they only had $400,000 of other taxable income, then $57,600 of the additional amount would be taxed at 15% and $42,400 would be taxed at 20%.