The greatest crime is that most US states have wildly regressive individual income tax structures. In a majority of states, the poor - who can least afford to pay any taxes at all, are required to pay a substantially larger percentage of their gross income on taxes than the rich. The worst states for this are the "no income tax" states which primarily rely on sales tax - which is in some cases even imposed on grocery purchases. For example, in Washington, the worst state for tax inequality, the poorest 20% pay 16.8% of their income in state and local taxes. The richest one-percent pay 2.4%. In Texas, it is 12.5% and 2.9% respectively. In Tennessee, it's 10.9% and 3.0%.
Pennsylvania has an income tax, but it is a flat tax 3.07% and with virtually no deductions aside from an insultingly condescending named "tax forgiveness" for the near-destitute - relying largely on sales taxes. So Pennsylvania's unfairness numbers are 12.0% and 4.2%.
It ends up that virtually all the US states are at least slightly regressive - the best states being New York, Minnesota and California - which have "almost-flat" tax structures - the rich only paying a little less a percentage as the poor.
Of course, a fair tax would be progressive - the tax rate going up with income (becasue the poor must spend everything they have on necessities while the rich sit on huge sums even after paying for their lavish lifestyles - and ONLY in the USA do I need to explain this!). No US states meet this criteria.
All the details are here:
It is a testimony to the effectiveness of our corporate propaganda media that the good work of the ITEP is totally memory-holed - becasue if journalists and reporters were doing their jobs on this issue, we would be having an entirely different conversation about taxes right now, and the "concerns" of the rich and big-business would be totally drowned out by the righteous anger of the working class massed around every state capitol.