"These reforms will offer the biggest tax revolution since the Reagan tax reform, which unleashed years of continued economic growth and job creation," the GOP presidential nominee told the Detroit Economic Club.

"I want to jump-start America. It can be done, and it won't even be that hard," he said.

In an hour-long address that also called for toughening trade policies and easing regulatory directives, Trump proposed to simplify the tax code to just three brackets from the current seven — 12, 25 and 33 percent.

"I am proposing an across-the-board income tax reduction, especially for middle-income Americans," Trump proclaimed, though the highest wage earners would see their rate fall from 39.6 to 33 percent.

"The rich will pay their fair share, but no one will pay so much that it destroys jobs or undermines our ability as a nation to compete."

Trump's proposal from last year had envisioned four brackets: zero, 10, 20 and 25 percent.