Writers for both the conservative Washington Times and National Review conclude that under today's conditions, the 9-9-9 plan would have generated about $1.7 trillion -- well short of the just-under $2.2 trillion in revenues the IRS collected in fiscal year 2010. So ignoring the economic effects of the 9-9-9 plan, it would have increased the already significant deficit by $500 billion.
"If Mr. Cain's team is building in some growth assumptions into the fiscal forecasts, they must be sunny indeed," wrote National Review's Kevin Williamson.
Bloomberg concluded that the plan would raise $2 trillion -- but that's if he successfully eliminates all special perks in the tax code. "Either Herman Cain is the tax messiah or is proposing a system that has no correspondence to real-world tax systems," Edward Kleinbard, a former chief of staff to the congressional Joint Committee on Taxation told Bloomberg. "In practice, it will have the same economic effect as a 27 percent uncapped payroll tax."
The liberal Center for American Progress calculated that, under pre-recession conditions, the plan would have yielded $1.3 trillion in revenues. But CAP calculated this figure based on 2007 Adjusted Gross Income figures, and Cain's plan would, he claims, wipe out the adjustments, and thus yield higher revenue.
The deficit view ignores the fact that 9-9-9 would have a sizable impact on the economy itself. Cain claims that it would be such a boon to growth that swapping it in for the current code would be revenue neutral.
"All of these measures would free up capital, spur production, and incentivize risk-taking, thereby fueling the economy and creating jobs," he wrote in a recent Wall Street Journal op-ed.
But as Diane Lim Rogers of the fiscally hawkish Concord Coalition notes, Cain's plan is exactly what you don't want to do in a weak economy. After all, if your a middle class worker, you'd pay 9 percent on all your income and 9 percent on your purchases which in lower and middle brackets constitute a significant percentage of your earnings. And even that doesn't count state sales tax.
"It's a cute little gimmick, but it's not an overall 9 percent effective rate," she said. "This kind of proposal would be bad for coming out of a recession. If you're trying to stimulate demand, you should encourage folks to buy goods and services. This proposal increases burdens on low income households and lessens demand."
By eliminating payroll taxes -- which create dedicated revenue streams for Social Security and Medicare -- those programs would be forced to operate out of general revenue. And if general revenue tanks under 9-9-9, and President Cain refuses to increase it, as he insists he will (indeed, as he'll ask Congress to write into the law) then those programs will be on the chopping block.