Burger King Worldwide, which has a whopper ($11.53 billion) of a merger pending with Canadian coffee house chain Tim Hortons Inc., is the most prominent target of new U.S. Treasury rules designed to curb tax-avoidance inversions via foreign merger. (For more coverage on tax inversion deals, see Tax Inversion Deals Increase Despite Criticims.)

But it’s the healthcare and pharmaceutical industries that could feel the brunt of new rules designed to curb the benefits of acquiring and merging with offshore firms in an effort to flee domestic tax rates that can be as high as 39% when accounting for both state and federal taxes.

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