Presidential debate 101: Does $25,000 deduction cap make Romney tax math work?

At the last presidential debate, Romney floated the number $25,000. According to one analysis, such a cap on deductions would generate $1.3 trillion in revenues, short of the estimated $5 trillion in tax cuts.

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AP Photo/Steve Helber
Republican presidential candidate, former Gov. Mitt Romney waves to supporters as he arrives for a rally at Tidewater Community College in Chesapeake, Va.

Mitt Romney stirred a new round of debate over his tax reform plan this week when he said a few simple words: "I'll pick a number."

The number the Republican presidential nominee picked was $25,000, as a cap on deductions that individual taxpayers can make from their taxable income.

This, Mr. Romney suggested in Tuesday's presidential debate, would be a central way to pay for his proposed 20 percent cut in income-tax rates for all payers. After weeks of debate over whether the math of his tax plan adds up, does the picture look any clearer with this number plugged in?

The nonpartisan Tax Policy Center has offered a new analysis concluding that within the context of Romney’s general plan, a $25,000 cap would yield $1.3 trillion in tax revenue over 10 years. That goes only about one-quarter of the way toward paying for what's estimated to be about $5 trillion in Romney tax cuts.

By itself, the gap between $1.3 trillion and $5 trillion doesn't prove that the Romney math is "impossible." But it provides one more hint of how challenging it would be to simultaneously accomplish core Romney goals: cutting tax rates while maintaining level tax revenues for the federal government, and ensuring that the rich still pay the same share of taxes they pay now.

Here are some of the issues in play:

• Because Romney wants the top 5 percent of households to keep paying the same share of US taxes they do now, one of the tasks he faces is finding enough new revenue (to offset the tax cuts) from high earners. The deduction cap is a good start toward achieving that end, the Tax Policy Center concludes. Of all the revenue brought in by a $25,000 deduction cap, fully half would come from the top 1 percent of earners, and 90 percent of it from the top quintile of households, the center reckons.

The deduction cap and other tax changes can bring in some new revenue from households below the top 5 percent, but on average, Romney says, he want middle class families to end up paying fewer taxes, not more.

• The partisan debate over the plan is rooted in some big uncertainties. First is that Romney has not spelled out details about his proposals to pay for the tax cut. Even the $25,000 figure is just an idea he floated during the debate, not yet a formal part of his plan.

Another uncertainty is whether $5 trillion is the correct total for the revenue hole the Romney plan would need to fill. Some defenders of the Romney math quibble with modest portions of that total.

• Capping deductions would be just part of the overall plan to pay for the tax cuts. (The deduction cap would limit the total amount a tax filer can claim for things like the mortgage interest deduction and charitable gifts.) Much of the debate over the tax math revolves around what other steps might be o taken, and how much revenue they would bring in. Other tax breaks in the code include those for municipal bond income and life insurance policies, for example.

"You'd have to go pretty hard into the savings and investment" side of the tax-break roster to make the rich pay enough to cover the cost of their 20 percent rate cut, Mr. Williams says.

• Another central part of the debate is over the "growth effects" of the tax plan. The rationale for Romney-style tax reform is that, by lowering marginal tax rates (including for many small businesses that are taxed under the individual income tax) it will help promote investment and job creation. Supporters of Romney argue that such effects will be considerable. Skeptics say they won't be very large, given Romney's goal of still bringing in the same amount of federal revenue.

Howard Gleckman, another expert at the Tax Policy Center, says in a blog posted Thursday that "if the deduction limit doesn’t raise enough money, lawmakers would have to reach into other tax preferences to pay for big rate reductions. And many of them, such as the exclusion for employer-sponsored health insurance and tax incentives for retirement savings, disproportionately benefit the middle-class."

He predicts that, to keep the pledge for the rich to pay a constant share of taxes, the road forward might involve some hike in the capital gains tax – something Romney has been opposing.

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