"If the tariffs were out of the picture, it would be real relief for American workers and businesses," the Tax Foundation's Erica York told Fortune.

State income taxes often reflect federal policies, but Washington, D.C. and some states have taken steps to keep the latest Republican changes out of their tax codes.

A major tax cut ballot question filed with the state's highest court is facing a lawsuit that has the potential to disqualify the question from the ballot.