Increasingly, U.S. corporations such as Burger King Worldwide Inc. (NYSE: BKW), AbbVie Inc. (NYSE: ABBV) and Pfizer Inc. (NYSE: PFE) are using acquisitions to move their headquarters to countries with lower tax rates. As the popularity of the practice grows among public companies, middle-market companies are also considering the tactic. But the strategy is coming under fire from consumers and politicians.

Tax inversions have been a major driver in cross-border dealmaking, accounting for 66 percent of proposed outbound deals in 2014, up from just 1 percent in 2011, according to Thomson Reuters.

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