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Corporate 'inversions' are the latest ploy to upend the US tax code

Chiquita Brands is one of the companies that did a corporate "inversion" deal this year
Esteban Felix | AP Photo
Chiquita Brands is one of the companies that did a corporate "inversion" deal this year

A once-obscure tax dodge known as a corporate "inversion" is turning the debate over U.S. tax reform upside down.

In an inversion, a U.S. company sets up or buys another company in a country with a lower corporate tax rate and then calls the new country home—thereby dodging U.S. taxes it would otherwise have had to pay.

The trick is more than three decades old, but a wave of inversions this year has prompted the Obama administration to call on Congress to slam the loophole shut.

Read More Obama presses to close corporate tax loophole 'inversions'

How does it work?

When a company undertakes an inversion, it's basically just moving its legal address outside the country for tax purposes. That lets companies move some of their profits to their new homeland and pay less in taxes to the U.S. Treasury. Nothing else moves; it's business as usual for their American operations, employees and customers.

The White House estimates the Treasury could lose out on as much as much as $20 billion over the next decade. So the administration wants to require companies that claim they're no longer American to be more than 50 percent owned by foreigners. That would make new inversions much more difficult to pull off.

Read More US could lose $20B from corporate tax inversions

But aren't corporate taxes higher in the U.S than most developed countries?

It's true that the statutory tax rateincluding state and local taxesis close to 40 percent, the highest among the developed world. But U.S. companies apply a long list of tax credits, subsidies, loopholes and other giveaways, so most of them pay much less than the top rate. Some, according to an analysis by Citizens for Tax Justice, have figured out how to pay no tax at all.

Total corporate federal taxes fell to about 12 percent of profits from U.S.-based activity in 2011, according to a Congressional Budget Office report. In a separate study, the CBO found that the average tax rate in 2011 among developed countries was 3 percent of gross domestic productcompared with 2.3 percent of GDP in the U.S.

So how much money is Uncle Sam losing from these corporate tax dodgers?

So far this year, only nine companies have flipped their corporate tax base upside down, including banana distributor Chiquita Brands International and drug maker AbbVie. But those moves have drawn lots of attentionand prompted other U.S. multinationals with large overseas holdings to consider heading for the corporate tax exit.

Some companies have already stashed assets and accumulated earnings outside the countryhoping that Congress will eventually lower the tax rate and allow them to pay less when they bring that money home. By some estimates, as much as $2 trillion in corporate cash is sitting outside the U.S.money that could otherwise be reinvested at home to expand domestic operations and create more jobs.


Why doesn't Congress just clean up the corporate tax code?

Corporations have been lobbying Congress for years to lower the corporate tax ratewhich would mean paring back a thicket of tax credits, subsidies and complex rules that everyone agrees needs an overhaul. But each of those loopholes has a company or industry lobbying to protect it.

A wave of inversions could make it even harder for Congress to pull off a "revenue neutral" tax reform package. To offset the money lost by lowering the top rate, Congress would have to close loopholes and subsidies. But if more companies dodge the American tax code altogether, those added revenues will be harder to find. The more companies shrink the overall pipe of corporate tax revenues, the harder it will be to make tax reform "pay for itself."

Read More CEOs to Obama: Tax reform, not an inversion Band-Aid

In any case, the tax reform debate has become mired in the ongoing political dysfunction that has already pushed the country near a debt default, temporarily shut down the government and, most recently, exhausted the highway fund that's needed to fix a national pothole epidemic.

Given that track record, it's hard to see how Congress will ever be able to tackle an issue as complex and divisive as tax reform. So some companies aren't waiting.

—By CNBC's John Schoen

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