>> no progressive income tax.
here are a couple of principles I can glean from Bava Basra –
1) taxes should preferably be allocated according to the benefit: paying for the wall may be according to number of people, level of danger, etc. That is, when possible, use “user fees”. For example, gasoline tax or turnpike fees look better than income tax – as long as they pay for the roads themselves.
2) apply wisdom, if possible, and use majority if not. A case of a guild who limited competition and then cut the skins of those who broke the rules. They are told that they should go to a Talmid Chacham in their city. If there is none, they are ok to follow majority.