Fuel and food, no tax.
School supplies, shoes, clothing, any item under $100, no tax. Over $100, ramp it up.
Diamond rings, 100% tax.
Alcohol and cigarettes, 20-30%.
Used cars, no tax.
New cars, 10% up to 100%. Credits if they're electric or extremely fuel-efficient.
Playstations, high end sneakers, Smart TVs, iPhones, rims, jewelry, expensive furnishings, rugs, anything better than your basic washer/drier: 100% tax.
Books: Free and subsidized by the government, as many as you want, any book ever written.
Healthcare: Free.
College: Free.
Basically under my plan, as long as you get stuff you need for your family, you pay no tax. If you get stuff you want for your pleasure, you pay tax on it.
How's that regressive?
The only real downside I see is the potential for a massive black market in luxury goods, tobacco and alcohol. But legalizing and taxing pot and prostitution should take some of the sting out of that.