You make a statement like that, you'd better be able to show me the math. So, I humbly request that you show me how you came up with that number.
"Proposals to replace the existing federal tax system have received increased attention in recent years, but the claims made on behalf of some of these proposals are not credible. In particular, claims that a national retail sales tax could replace the income tax system, the estate tax and payroll taxes at a 23 percent tax-inclusive (30 percent tax-exclusive) tax rate are fundamentally flawed."
"This paper shows that such claims hinge on hidden reductions in real government spending of almost half a trillion dollars per year, and on the impossibly optimistic assumptions that there will be no tax avoidance, no tax evasion, and no statutory erosion of the proposed tax base. Corrections for these problems show that plausible national retail sales taxes will require--at the federal level--tax-inclusive rates on the order of 50 percent and tax-exclusive rates on the order of 100 percent."
"Accounting for economic growth would reduce this rate, but consideration of state and local taxes would raise the rate by even more than growth would reduce it. Finally, given the experience of other countries with high-rate retail sales taxes, there have to be serious questions about whether a sales tax with rates that high could actually been forced."
WHO is fairtax.org
Things like that bother me.