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Is the purpose of taxes to fund the government or punish the rich?Obviously it should do both.
Joking aside, if the purpose is to fund the government as good as you can (that is, societies central pool of resource to be able to produce democratically controlled and publicly available "nice stuff") then it makes sense to take as much as you can from the rich (which can afford it) and a normal amount from the average/poor (which can't afford to pay much).
A tax could be:
1) None. Then a country wouldn't be able to maintain e.g. an army or basic infrastructure, and either the country would be at the mercy of other countries that can, or the majority would be at the mercy of moguls that can afford to pay for those things. Some third world places are close to the latter.
2) Flat ($10K for a lawyer making $2M/year, $10K for a single mother of two juggling 2 jobs and making $40K). Most would agree that's bad.
3) Fixed ratio (e.g. 30% of said lawyer's income, 30% of the income of the single mother of two juggling two jobs). The lawyer is then left with $1.4M, more than enough to live in luxury, pander his kids etc, buy 4 new cars per year, etc, whereas the mother can barely survive and do basic spending or cover an emergency with the $28K that remain. Not sure how you find it, not a big fan.
4) Progressive scale. The government gets more from the lawyer (and as people getting richer) and not a fixed ratio. The reach still keep more than enough to do whatever BS they want (e.g. $2M - 60% is still 800K/year). Plus most of their money is not in income but wealth, and the ultra rich have already hid it through 2000 schemes.
>In the US, billionaires make just 1.3% of all income.
Property beyond a certain level should be taxed way worse than income. It's just hogging resources from society and giving to much power to money-based, as opposed to bloodline based, neo-feudal lords. Let's throw that majority of the wealth that they own into collective infrastructure for that "bottom 99%" (which, after all, earns 80% of income and pays more taxes).