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The White House and Congress are working on a deal that would help cut deficits in the long run, while avoiding the dread fiscal cliff. One of the biggest hurdles is the president's proposal to raise tax rates for the wealthy. Republicans think a better way to raise revenue would be to close loopholes and limit deductions for high income people. But there are questions over whether that would raise enough money.

NPR's John Ydstie has more.

JOHN YDSTIE, BYLINE: The argument over how to get additional revenue to close the budget gap was carried on in dueling post-election news conferences since last week. Here's House speaker Jon Boehner.

REPRESENTATIVE JOHN BOEHNER: There are a lot of special interest loopholes in the tax code, both corporate and personal. They're all kinds of deductions, some of which make sense - others don't.

YDSTIE: The Speaker said that limiting or ending those unproductive tax breaks could boost growth and raise revenue. But President Obama expressed skepticism during his news conference. He said the Republican approach wouldn't raise enough money.

PRESIDENT BARACK OBAMA: It's very difficult to see how you make up that trillion dollars, if we're serious about deficit reduction, just by closing loopholes and deductions. You know, the math tends not to work.

YDSTIE: And the total that needs to be made up isn't just $1 trillion. That's because the president's proposal already calls for reducing mortgage interest and charitable deductions for the wealthy. And they're worth another $600 billion. So the total pile of revenue the Republican plan would have to produce to match the president's proposal is about $1.6 trillion.

That's a tall order. One approach that was suggested by Mitt Romney during the campaign, and endorsed by the Wall Street Journal's editorial page last week, is to cap tax deductions at a specific dollar level. The non-partisan Tax Policy Center has analyzed the idea. Its co-director, Donald Marron, says if you cap deductions for all taxpayers at $17,000 a year could produce $1.7 trillion in revenue over 10 years. That would meet the president's dollar goal. But there's one problem, says Marron.

DONALD MARRON: That would get to the president's revenue target, but obviously it would violate his desire not to raise taxes on people below the top two percent.

YDSTIE: Of course, Marron says, Republicans don't agree with the president that $1.6 trillion in added tax revenue over the next 10 years is the right goal.

MARRON: There's also been discussion of aiming for $1 trillion rather than $1.6 trillion and obviously $1 trillion would be easier to get to by doing things purely through deductions and exclusions and other tax breaks.

YDSTIE: If you push that cap on deductions higher, let's say, up to $25,000, you could meet that $1 trillion revenue target. But you still don't eliminate the political problem, because around a quarter of the added tax burden would still fall on the middle-class taxpayers the president has pledged to protect. Donald Marron does believe that eliminating many of the deductions and loopholes in the tax code is a good idea and could make the economy more efficient. But, he says, it needs to be done thoughtfully and deliberately.

MARRON: You know if we had a rational, careful process, we would go through all of them one by one and decide whether to keep them, to fix them or to get rid of them.

YDSTIE: Marron says dealing with the mortgage deduction provides a good example of the care that needs to be taken.

MARRON: There are many good arguments for why the mortgage interest deduction is bad policy and ought to be changed or eliminated. But you wouldn't want to do that tomorrow. That would be unfair to the people who've just bought a home on the expectation that they would have it. The housing market is weak.

YDSTIE: And ending the deduction could send the housing market back into the tank. Marron says it's the same with many of the other deductions that don't make sense. If they're going to be eliminated, Congress needs to figure out a way to phase them out slowly to give people time to adjust. John Ydstie, NPR News, Washington.

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