In post #6 above, I said the present income tax will never be replaced by a sales tax.
But...
As soon as the transitional democrat-communists come to power, expect the passage of a "value-added tax" on most or all commercial transactions.
They'll start out modestly -- say, 15-20% -- but when the "transition period" ends, and the communists come into full-strength, expect that to be increased. I'll reckon 30% will be their starting point.
Along with that, I foresee a ban once again on the private ownership of gold -- it will either be turned in or they'll come a-searchin' for it, with little or no compensation to the [former] owners.
And along with gold, they may ban ownership of silver, as well (though I sense there will remain a healthy black market on the exchange of "small denomination" silver -- old, junk silver coins -- for goods and services, or for the new "blue buck" currency that will replace our current greenbacks).
Finally, there will be some kind of taxation of private investments. Certainly some kind of "wealth tax" upon the value of 401k's, IRA's, etc.
The communists will need to raise money to cover the collapse in normal tax revenues as businesses fail or are taken over.
They'll also need a way to maintain debt obligations.
HOWEVER -- I expect the "full" communists to simply renounce large portions of the debt, by saying that "it no longer exists".
Perhaps that portion of [former] U.S. securities owed to China will be "exchanged" for portions of land or even the establishment of Chinese bases on the American mainland. Don't put this past them.
If you are unwilling to look into the future to see what's coming, you're unable to fight to STOP it from happening.
"After Trump... the deluge."