Corporate tax rate would arrive at 20% in 2022, down from the current 35%.

Corporate interest deductions, minimum foreign tax are among the question marks.

Corporate interest deductions, minimum foreign tax are among the question marks.

Shift from global system would likely be permanent, sources say.

Shift from global system would likely be permanent, sources say.

Experts say cuts may either have to be shallow or short-lived.

Experts say cuts may either have to be shallow or short-lived.

Mnuchin says tax 'doesn't create a level playing field.'