Only taxes should be sales taxes. Basic food items would be tax free. Same with clothes, and other extreme basics/requirements, including medicines and treatments. Maybe you get a set value for things like homes or transportation. First 80k, or whatever, is tax free.
Anything that goes beyond basic requirements gets hit with a luxury tax.
Some items are luxury goods period. Anything that is need or preference based would be taxed as a luxury item.
I could see some items easily having 100%+ tax rates attached.
I would also allow for stacking of tax rates, city, state, federal, but the categories would need to be set by the federal level. An apple is always a basic food item, caviar is always a luxury, something like that.