If i could set the rules, there would be universal salary caps, and any income above that had to be given in the form of stock in the company you work for, frozen in your possession for at least two years, to guarantee that incomes above a certain level were 100% dedicated to productive investment, though the ceiling for that would be at like $10 million annually.
Also provisions to seize 100% of income that people deliberately attempt to hide from taxes
Monster Hunter: pissing me off since 2010.