Despite the uncertainty, strong feelings about the new rules have already formed.
A little more than half of Americans say they disapprove of the change, while nearly 40 percent favor it.
Support for the legislation also varies widely by party.
Nearly 80 percent of Republicans approve of the new tax law, compared with just 15 percent of Democrats.
“Republicans say, ‘Yes, they passed that big tax law so I’m happier’,” said Newport. “Democrats just tell a pollster, ‘No, I don’t like it. It’s associated with Republicans.'”