The rich half of the US populus own about $156 trillion. Thus therefore as a conclusion therefrom you only have to take 23% from half the population. Lets make it progressive from 0% at average wealth to 52% at the top.
Much less than Roosevelt's 94%
But I'm neither democrat nor republican, it might not make sense to anyone :)
To be sensible, you don't just pay 100% and be done with it. That would be silly. 1.3% for the top hoarders seems enough. It will grow back.