Progressive tax is normal in most functional countries, it's not rocket science.
Basically you define X as a base sum that needs to be controlled for inflation. Minimum wage can be 2X, whereas 100% taxation might be reached at an income of 300X. In this scenario, nobody could earn more than 150 times minimum wage, and manipulating the calculation of X to make the rich richer would also benefit everyone else.
A bigger challenge is that billionaire scum tend not to have income, only loans, so they don't pay tax at all. But that's also easily fixed if there's political will.