You know it's this kind of stuff that actually makes the tax code so complicated, but because you insist: An amount of wealth that would provide you a top %0.1

You know it's this kind of stuff that actually makes the tax code so complicated, but because you insist: An amount of wealth that would provide you a top %0.1 lifestyle if you were to retire today based on a standard 60/40 portfolio (to be adjusted every N years to reflect new data) and actuary tables. It doesn't have to be this exact policy, but this isn't hard to think something like this up.