[ghostbrainalpha]

You are correct it is an oxymoron, but the most realistic Flat Tax proposals do just that.

They say there should be a 20% tax, on any income above the $35,000 a year threshold. While it still does effect people on the lower end more, the first part of their income is at least partially untaxed.

And the bar is low enough that the super rich will not be able to create schemes to keep there income under that bar.

[openasocket]

I'm having trouble seeing a flat tax proposal that doesn't massively decrease tax revenue. Also, a tax on what, exactly? Income? Capital Gains? Sales? Property?