"Unlike the current system, a flat tax is simple, fair, and good for growth. Instead of the 893 forms required by the current system, a flat tax would use only two postcard-sized forms: one for labor income and the other for business and capital income. Unlike the current system, which discriminates based on the source, use, and level of income, a flat tax treats all taxpayers equally, fulfilling the “equal justice under law” principle etched above the main entrance to the U.S. Supreme Court building. And unlike the current system, which punishes people for contributing to the nation’s wealth, a flat tax would lower marginal tax rates and eliminate the tax bias against saving and investment, thus ensuring better economic performance in a competitive global economy."
Retirado de http://www.heritage.org/Research/Taxes/bg1866.cfm