The Tax Policy Center, which provides nonpartisan analysis of tax and budget policy, projected the bill would result next year in a $150 tax break for the lowest quintile of Americans, a $1,750 tax cut for the middle quintile, and a $10,950 tax cut for the top quintile. That’s compared to what they’d face if the 2017 tax cuts expired.

With Sens. Rand Paul and Thom Tillis opposed to the package, GOP leaders can afford only one more defection. And multiple Republicans aren't yet sold on the measure.