In America people pay the progressive tax- essentially, the more money they make the higher percentage tax they get.
It would be a good idea if in towny we can establish a progressive towny tax.
How it would work is that you can toggle how much each bracket of balances pay (either % or flat tax is fine), and you can also decide what thresholds exist as a tax bracket.
This would make it easier for larger towns to afford upkeep as well as imitating the real world economy in a more realistic fashion.