However, employees would need to repay the federal government eventually without an act of Congress.
Consequently, many employers may choose to continue collecting the tax and set it aside to meet that future obligation, said Michael Graetz, a Columbia University law professor and co-author of The Wolf at the Door: The Menace of Economic Insecurity and How to Fight It.
I don't know how much of this is going to get into workers' pockets, Graetz said.
Trump is proposing that Congress pass a permanent payroll tax cut, but the prospects of such a measure is uncertain.
Democrats and some Republicans are against any change to the payroll tax because it could deplete the Social Security and Medicare Trust funds.