Lawmakers could impose stricter federal oversight on an emerging asset class.
It could be a sign of trouble for the sweeping measure.
The plan to deliver up to $6 trillion in tax cuts faces challenges even from rank-and-file House Republicans.
Main disputes center on proposals dealing with the estate tax and state and local tax payments.
Republicans moved on a tax overhaul, while Fed officials warned about inflation and federal debt.
The Republicans' proposal would also set up a new 20-percent tax rate for public companies.
Just under half of the poll's participants viewed a lower corporate rate as being the main economic driver of tax reform.
A bipartisan package could lower the corporate tax rate to 25 percent or 28 percent while helping small businesses.
The tax oversight committee prepares to unveil legislation to overhaul the U.S. tax code.
The bill would cut the corporate tax rate from 35 percent to 20 percent.