Earlier quoted context omitted.
If both the state and federal governments each had a 55% tax rate, you'd be justified in questioning the rates and voting for a different government! Just as I expect people would complain if there was just a single tax authority, but it set a rate of 110%. Assume for now that we accept the federal government is entitled to raise money for its programs by taxing people's incomes (yes, some people might disagree, but…
At the end of the day I think it matters because high tax states have already been subsidizing red states and one of the pressure release valves was that they weren’t taxed twice on the same income. I.e: https://www.apnews.com/2f83c72de1bd440d92cdbc0d3b6bc08c So you remove this pressure valve and skew those numbers to an even wider margin and you have, I would say justifiable, consternation about what we are doing he…
Arguably, it would make more sense to allow a deduction on state income tax for federal tax paid. That way the federal tax -- which (in theory, at least) pays for services that benefit all states -- is imposed consistently across all the states. Individual states can then decide how much to tax their citizens to pay for the state's local services, without skewing how the federal tax burden is applied.