The U.S. tax code, and particularly the corporate income tax code, need a VAST overhaul.

The U.S. has the highest corporate tax rate in the developed world, yet manages to bring in far less revenue then many other countries.  Canada's Federal government brings in about 2.0% of GDP in corporate taxes with a Federal tax rate of 15% while the U.S. brings in only about 1.6% of GDP with a Federal tax rate of 35%.  Why?  Because their tax code is chalk full of special deductions, credits, exemptions, grants, etc. etc.

If the U.S. actually does eliminate 90%+ of their deductions, credits and the like they could easily bring in more revenue with a 15% tax rate than they do with their current 35% tax rate.  At the same time they would reduce compliance costs for companies and administrative costs for the government.

However they would lose the opportunity for politicians to pretend they are "doing something about the economy".