From the summary of An Overview of Recent Tax Reform Proposals (Feb. 28, 2017 R44771):
Many agree that the U.S. tax system is in need of reform. Congress continues to explore ways to make the U.S. tax system simpler, fairer, and more efficient. In doing so, lawmakers confront challenges in identifying and enacting policies, including consideration of competing proposals and differing priorities. To assist Congress as it continues to debate the intricacies of tax reform, this report provides a review of legislative tax reform proposals introduced since the 113th Congress.
Although no comprehensive tax reforms have been introduced into legislation yet in the 115th Congress, two 2016 reform proposals appear to be at the forefront of current congressional debates—the House GOP’s “A Better Way” tax reform proposal, released in June 2016, and President Trump’s campaign reform proposal, released in September 2016. As with most recent tax reform proposals, both of these plans call for lower tax rates coupled with a broader tax base. In either case, numerous technical details would need to be addressed before either plan could be formulated into legislation.