I don't disagree with the flat income tax. My only problem is that those who hide income now would still escape the flat tax. I want illegal immigrants and drug dealers to pay their share.
No matter what tax system you set up, you won't always get
1) those paid under the table" on Income tax
but you also won't get
2) those buying stolen/smuggled goods on a sales tax.
So the argument could be your example illegals and drug dealers are likely to escape a sales tax on the black market goods they buy, whereas employers would have to withhold and they'd pay tax on their paid income. Since more illegals are employed than buy/sell illegal items more would pay an income tax (employer holds it) than a
sales tax when they report the
illegal sale of the stolen/black market/smuggled "new" item, which of course, they won't report.
The "fair" tax encourages buying black market and stolen goods if you want "new" items ... quite a goal.
Tax on spending will increase smuggling, as buying off the Internet is done by many to avoid sales taxes now, we'll see more smuggling to avoid sales taxes.
increasing investing also promotes economic growth
Another consequence:
As sales of "new items" decreases, businesses will suffer, have less income to reinvest, and less income to hire employees to sell to the fewer people buying "new" so they'll need to manufacture less and lay offs will be eminent, putting less $ in circulation so even fewer buy "new"... from there it just repeats the layoff-higher unemployment/fewer buying new/manufacture less/sell less "new" cycle in a downhill spiral.
So, by taxing "new" items sold, crimes will increase, unemployment will increase, business revenue will decrease, business reinvestment will decrease, overall tax revenues will decrease as everyone buys more smuggled "new" goods and sales through legal channels decrease and salesmen/distribution centers close and they'll not have incomes so they buy less and so factories close ... but
Mexico will have an incentive to smuggle more items in; and those who would rather spend (New LED TV) 33 watts of electricity than (used TV) 200 watts of electricity on a monthly bill so they can buy more food with the money saved ... would be tempted to buy those untaxed "new" goods. Of course the rich don't care if they do spend 200 or 600 watts per hour on electricity or get 5 gallons per mile as they can afford it, but they'll be buying the new energy saving models, while poor are forced to buy things which cost more in the long run with energy costs and maintenance of their "used-energy wasting" purchases,
or ... they can buy black market "new" items and save energy/maintenance costs and eat better foods with the money saved-similar to how many buy over the Internet now..