It actually goes back to the flat tax proposals to set the top rate to 28% with very few deductions. The idea was that you don’t have some rich paying the top

It actually goes back to the flat tax proposals to set the top rate to 28% with very few deductions. The idea was that you don’t have some rich paying the top rate of 39%, and some paying near zero (cough, cough, Mr. Trump) due to a large discrepancies in deductions.