Maybe do some research before suggesting something like this.
Those who own homes/land/property will pay more because they're expenditures are more.
Example: You earn 70k per year, you get 30k for gbi. That's 100k. Of that, you spend 80% on housing, school, food, clothes, toys, w/e, and invest 20% for retirement.
Of that 80% you spend 5% on taxes via sales tax. So roughly $4,000 a year in taxes.
If you earned 30k, and didn't work at all i.e. 30k from gbi alone, and spent all of it, you'd have spent 1500 on taxes, but still be able to feed/clothe/house a family in at least some comfort.
I don't see how that makes life unbearable for everyone? If you're an immigrant who isn't a citizen yet, you'd pay a bit more, but that's the price of coming to America, deal w/ it. At least you'll never be deported, or have your family ripped away from you, etc...
This would immediately make non-documented people and visitors with greencards pay a lot of taxes. It's their choice if they want to stay/pay or go and not-pay their share, but the republicans can stop whining about immigrants not paying their fair share if they pay 3 times the sales tax.