Trump’s response to Hillary’s accusation of not paying taxes, ‘I was smart’, was a interpreted by media as an admission that never paid taxes. He never said that.

Hillary on the other hand tried to claim that he never paid any by citing two years, even though there were more years available to refer to. And in those years he did pay.

Any one might not pay in a given year because of deductions, donations, loss, especially when one is in real estate.