Taxing according to a square law of earnings also would be cool, but again all of this looks like old world thinking, given that we know the world is ending because of human abuse of energy.
It has to be accepted that in order to change to a survivable mode, the whole structure of government has to change, from one of controlling people, to one of governments serving people.
Governments should be paying people, not the other way round.
That will never be possible as long as government depends on getting its energy from people and the environment via money.
The answer is to make governments themselves solar powered.
This would be obvious if science had always mathematically signed energy according to source of Joules on Earth, positive from the sun.