Imagine a world where we had no income tax, sales tax, or property tax - only a steep estate tax. Each new generation would start over in something more like a meritocracy. Business and employment would boom without the other taxes / deadweight losses. Plus, each individual would get to enjoy the benefits of 100% of their earnings, perhaps for the first time in history. Meanwhile taxation and government financing would be dead simple, if you’ll excuse the pun.
I’d give it a try. Attaining FIRE would be a lot simpler.
If there's only a steep estate tax, there's nothing to prevent Mr. Moneybags from distributing his fortune to all the little moneybags before he kicks the bucket. Maybe you'll catch people like the billionaire who died in that helicopter crash last week, but anyone who has time to plan can mostly avoid this tax.
Well, actually there is--there's a gift limit in the US of $15,000 per recipient per year. Of course, Mrs Moneybags could also give $15,000 to each person, so they could give Little Moneybags and his wife a total of $60,000 per year. And if Mr. and Mrs. Little Moneybags, have kids? Well, that's another $30k/year per kid.
Or, Mr. Moneybags could "hire" Little Moneybags for $250k/year as a "consultant" of some sort for his company. Or set up a trust. Or create a partnership business.
Personally, I like the idea of replacing the current gordian knot of tax law with a straightforward consumption tax.