But obviously, a maximum rate of 25% would generate significantly less gross tax revenue than the current system, which contains a top rate of 39.6% (actually, over 44% when factoring in Obamacare and the repeal of the PEASE limitation on itemized deductions).

FORBES: Tax Aspects Of Paul Ryan's FY 2014 Republican Budget Proposal

What if, instead, Congress and the President agreed that the new reformed tax code should raise xx percent of Gross Domestic Product in revenue in 2022?

FORBES: A Path To Tax Reform In Four Simple Steps