0-10% flat tax rate.
The happiest, most free, most prosperous societies in history, always had a tax rate of about 10%. (friedman).
A 10% flat tax will leave the government extremely small. There's nothing there to lobby for or to take from the rest of society. There's no pension fund, no education fund, nor healthcare fund to plunder. Those that rise to the top are there for honest reasons. And they have the skills, resources and talent to wipe away ailments of the people. And it's always this way.
And if a man so happens to wipe away hunger from the face of the Earth through his new genetic methods, should this man pay more than the rest of society? doesn't he have the resources to employ thousands of people? To raise the quality of life to all those who join him in his venture?
And such a man existed, and yet, the 99% never knew his name nor thought to have asked.