The Democratic and Republican presidential nominees would take the U.S. tax code in sharply different directions, with Hillary Clinton seeking more revenue from the top 1% of households while Donald Trump would give those Americans tax breaks, according to an analysis released Tuesday.

“In almost every meaningful respect, these plans are mirror images,” said Leonard Burman, director of the Tax Policy Center, which analyzed both candidates’ tax plans. “They really couldn’t be more different.”

Mr....