Carroll, Robert and Alan D. Viard, “Value Added Tax: Basic Concepts and Unresolved Issues,” Tax Notes, p. 1117, 03/01/10

Some research suggests that a complete-replacement consumption tax could increase the long-run size of the U.S. economy by nearly 10 percent, although other estimates of the output gains are lower.   Even complete replacement of just the corporate income tax could have sizable effects.  For example, the 2007 Treasury report…estimated that replacement of the corporate income tax with a VAT would increase long-run output by 2 to 2.5 percent.  Of course, none of these economic gains would arise from an add-on VAT that financed new government spending, p.1121