I think taxes should be based on a 5-year rolling average, to ease the burden for people who have high income only once in their life. Winning the lottery or patenting an invention that makes you rich is the American dream. Let’s tax high earners but show some lenience for folks who have a once in a lifetime windfall.
I believe the Australian tax code already allows that to some degree, its never applied to me though. I think its meant for sports people, who will earn lots in 5-10 years, but then not earn anything after that.