The United States' position on the Laffer Curve According to a 2012 IGM panel (cf. reference below), most experts believe that a federal income tax cut would lead to a higher GDP in five years, ceteris paribus. Is this effect purely Keynesian, and based on a presumption that the U.S. was still recovering from the recession and that greater fiscal stimulus was called for, or does it truly reflect a belief among the majority of mainstream economists that the U.S. federal tax regime is sitting on the wrong side of the Laffer curve as the title indicates?

Source: http://www.igmchicago.org/igm-economic-experts-panel/poll-results?SurveyID=SV_2irlrss5UC27YXi
Question B in the link answers your question: most participants believe that taxable income would not rise enough to offset the tax cut, indicating that they do not believe we are on the wrong side of the Laffer Curve.