There is no way a sales tax will be 'enough' for politicians.
Here in the Netherlands, we used to have 19% sales tax, 6% on food.
Now they found that the deficit is too great, and there has to be 'austerity'.
Absolutely nothing is cut, maybe some proposed increases, but what is done,
taxes are raised, which one ? Sales tax.
Why ? Because tax on income will not get through as easily.
Increasing sales taxes, these politicians can agree on quite easily.
So starting this October, sales tax will be 21%, and 7% on food.
Tax on gasoline is already bad, a gallon of gas costs you around 8-9$ here when converted from gallon/L euro/$.
Spending is the problem, as long as politicians spend so much money, they will have to tax more.
You can think of all sorts of ways to provide the government with a steady stream of taxpayer money.
I have however been convinced that starving the beast is the only sound thing to do.
I'd like to say, sales tax is a more 'fair' tax, as it does not tax what someone already owns but merely what someone acquires. I am however still of the opinion that a tax like this would not solve the spending problem nor the power grabbing of various politicians.