In Spain if you work and you cost your company 26430 euros:
- The company pays 6430 for social security (calculated as a % of your salary, so this is effectively your tax even if on paper it's the company that pays it.)
- You pay 1270 for social security (on paper you pay it but the company gives it to the tax office directly)
- You pay 2338 for income tax (on paper you pay it but the company gives most of it to the tax office directly)
- You end up getting 16390 euros, or an effective tax rate of 38%.
This goes up if you pick a higher salary, obviously. If you work and you cost your company 67000 euros:
- The company pays 16300 for social security
- You pay 3101 for social security
- You pay 11582
- You end up getting 36016 euros, or an effective tax rate of 46%.
If you're a freelancer and you work for yourself it's more or less the same but there's also a fixed tax that while not being very high it's hard to deal with when you're earning 0 when starting out. In practice most people just risk it and don't report their activity at first for this reason.
But if you're truly rich, you don't work, you have assets that appreciate for you. Tax rate for capital gains is capped at 26% no matter how many millions you're earning.
This does not take into account that as a rich person you're going to be spending less of the money you earn than a poor person so you're paying less VAT (sales tax) as well.