Brian Wesbury is very skeptical on historical grounds that adding a VAT can do anything to increase revenues relative to GDP:
"[T]here have only been eight years of balanced or surplus budgets in the 61 years since 1950; spending as a share of GDP averaged just 18.1% in those years. In other words, the more the government spends, the harder it is to balance the budget.
"[N]o matter the rate on the income tax, tax receipts are rarely above 19.5% of GDP. The top individual income tax rate has been as high as 90% and as low as 28% in the past 60 years, but revenues have remained in a fairly narrow range. ...
"In 2011, government spending was 24.1% of GDP, and under President Obama’s budget proposal it is never going to fall below 23% of GDP. In other words, there is no tax regime in the history of the United States that has generated enough tax revenue as a share of GDP to balance the budget today, or in the future."
But the problem with this analysis, of course, is that Wesbury is comparing income tax "apples" with value added tax "oranges." The latter have never been on the menu here. They have been elsewhere, as he discusses, but not as stand alone systems. Like Christianity, a VAT isn't a failure. It just hasn't been tried.
While there is every reason to be as skeptical as Wesbury is that a VAT would replace the income tax and wouldn't instead be layered on top of it and contribute to an even more onerous spiral of taxation and spending, Wesbury leaves out of account the moral virtue of a VAT as a tax on consumption and a spur to saving and investment.
Historically conservatism has too rarely taken a stand critical of materialism, especially of the American kind where 70 percent of the economy has depended on consumption. From this perspective, taxing consumption is a much more commendable idea than taxing income, which we say we want to encourage. "If you want less of something, tax it." Is it any surprise that incomes are declining?
Instead what Wesbury is unintentionally demonstrating is that our civilization has reached the limits of the income tax regime instituted in 1913, just as the limitations of the tariff and excise regime for financing mass democracy had been reached at the end of the 19th century.
Perhaps the even more fundamental point is whether mass democracy itself is viable anymore, whether in fact "mass democracy" is not an oxymoron. After all, once the people vote themselves goodies picked from their fellows' pockets, it can't help but implode.
The rich will only put up just so long with this arrangement until they pick up their capital and leave. Indeed, one could argue that precisely that has been occurring for quite some time already. The exodus of manufacturing capacity is the form it has most obviously taken since the opening to China. Less well recognized is the rise of the international citizen who picks up his family and settles in places like Singapore or Macau as the case may be. Greece has imploded under similar circumstances, its richest citizens having long ago made arrangements to avoid the plundering which its tax system means.
Aristotle even longer ago understood the affinities between extreme democracy and tyranny. The rich do what they can, and exile themselves. The rest do what they must.