We have neither an income nor sales tax here in NH. I've often been asked which I prefer. My response is "if you put a gun to my head, I'd choose the sales tax".

I look at it this way. When I earn money, I have a choice - spend or save. If I spend, I'm making my contributions. If I save, I'm making capital available for investment. An income tax removes a lot before I get to make that choice and, more importantly, makes it easy to put citizens against each other - very easy to "divide and conquer" with social engineering of the tax code.

Much harder to do that with a flat national tax.