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Here's the basic idea of what I'd think is fair
You have a basic rate for income below the 20th percentile of all incomes
Multiply that by 1.5 for income between that and the 40th percentile
Multiply that by 1.25 for income between that and the 60th percentile
Multiply that by 1.125 for income between that and the 80th percentile
Multiply that by 1.0625 for income between that and the 95th percentile
Multiply that by 1.03125 for income between that and the 99th percentile
Multiply that by 1.015625 for all income above the 99th percentile, with the additional caveat that people who top this bracket even once cannot hold public office, donate to political campaigns, or hire lobbyists and lobbying firms for ten years following them topping out.
Imagine something similar for taxes on units of housing owned, dividends earned, and so on and so forth.
The idea being that the highest rate can't be adjusted without significantly reducing the tax burden of the poorest, basically erasing the only way conservatives have been able to balance the books whenever they try that shit.