If my tax bracket is over 15% tax bracket, will I be paying the 15% tax on whole amount of qualified dividends?

I make about $13,500 in dividends from Mutual funds I own. If I am over the 15% tax bracket by about $2,000, do I have to pay the whole 15% tax on the $13,500 dividend income? Or is it prorated and I pay 15% on the $2,000 and the rest gets taxed at 0%?