“The ideal tax system … is neutral to business activity. In such an ideal system, individuals and businesses would base their economic decisions solely on the merits of the transactions, without regard to tax implications. In reality, tax-induced economic distortions are a fact of life, and a more realistic goal is to maximize the occasions when businesses and individuals are guided by economics, and minimize those cases where economic decisions are micromanaged or even dictated by a tax system. Therefore, the most competitive tax systems, and the ones that score best in the SBTCI, are those that create the fewest distortions by enforcing the most simple tax system based on broad bases with low rates.”
This is an excerpt from a great article on simplifying the tax system in ways that don’t automatically mean a flat tax. The tax system’s complexity doesn’t stem from brackets. It is caused by the overabundance of various tax credits and other deductions applicable only to certain groups of people in certain specified situations.