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[Interviewer]
Specifically what tax loopholes would you close and what exemptions would you eliminate to make the revenue-neutral equation work?

[Romney]
Simpson-Bowles laid out a formula that shows that you can do just as I described. That you can bring down the rates, limit deductions and exemptions for people at the high end, and with additional growth that comes by virtue of the stimulative action you can reach a balanced budget. I will follow a model similar to Simpson-Bowles and work with Congress to identify which of the alternative methods we should apply to reduce deductions, benefits, and exemptions. Those reductions will occur for people at the high end. I have noted before my commitment to preserve tax preferences for middle-income taxpayers such as homeownership, charitable giving and health care.

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In an interview with Fortune earlier this month, Mitt Romney responded to the Tax Policy Center’s analysis of his tax plan:

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I indicated as I announced my tax plan that the key principles included the following. First, that high-income people would continue to pay the same share of the tax burden that they do today. And second, that there would be a reduction in taxes paid by middle-income taxpayers. Those are the key principles of my plan that the Tax Policy Center chose to ignore.

No, the Tax Policy Center didn’t “ignore” those principles. It tried to test them. And the principles failed.

What’s more, they failed for a comically simple reason. “The total value of the available tax expenditures (once tax expenditures for capital income are excluded) going to high-income taxpayers is smaller than the tax cuts that would accrue to high-income taxpayers, high-income taxpayers must necessarily face a lower net tax burden.”

That is to say, the tax cuts Romney is promising the rich are larger than the available storehouse of tax breaks Romney can close to pay for them. As such, if the plan is going to be revenue neutral, as Romney has pledged, it is mathematically impossible for it to do anything but shift the tax burden away from the rich.