When in office, former President Clinton proposed a very simple flat personal income tax system for the Federal government.

FORBES: A Simple Federal Flat Personal Income Tax System

He has advocated a simple two-rate personal income tax system, under which individual taxpayers could fill out their returns on a single sheet of paper.

FORBES: What Next?

Some highlights of the Roadmap: Replace Medicare with a voucher-based system, get rid of the corporate income tax and replace it with a consumption tax, offer a simplified income tax system and personal investment accounts as an alternative to the current Social Security system.

FORBES: Should Rep. Paul Ryan's Roadmap Be Taken Seriously? Weigh In.