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			 For months, Treasury has offered no fresh guidance on the inversion 
			issue, leaving tax experts to speculate about what could come next. 
			Inversions typically involve a U.S. multinational buying a smaller 
			foreign rival and relocating to its home country, if only on paper, 
			to escape U.S. taxation. 
			 
			Allergan shares fell 2.3 percent on Thursday afternoon amid reports 
			that Treasury might move to block its deal with Pfizer. 
			 
			Possible steps the government might take include tightening the 
			rules on two strategies related to inversions, tax experts said: 
			"earnings stripping" and "skinny down" distributions. 
			 
			Treasury took several actions in September 2014 to reduce the tax 
			benefits available to companies that have inverted, while also 
			making new inversions more difficult to do and less potentially 
			rewarding. The moves stemmed a wave of inversions, but not before 
			Minnesota medical technology group Medtronic <MDT.N> reincorporated 
			in Ireland. 
			  
			 
			 
			At the time, Treasury and the Internal Revenue Service said they 
			were weighing further actions. On Friday, a Treasury spokeswoman 
			offered more of the same language. 
			 
			"The Treasury Department and the IRS expect to issue additional 
			guidance to further limit inversion transactions," said the 
			statement from late last year. 
			 
			That guidance said Treasury was looking at ways "to address 
			strategies that avoid U.S. tax on U.S. operations by shifting or 
			'stripping' U.S.-source earnings to lower-tax jurisdictions, 
			including through intercompany debt." 
			 
			Because U.S. corporations don't disclose what they pay in income 
			taxes, it's hard to estimate how much revenue has been lost to 
			inversions or could be lost in the future. A congressional committee 
			estimated in May 2014 that legislation then being debated to largely 
			slam the door on inversions would raise almost $20 billion from 2015 
			through 2024. That legislation was never adopted. 
			 
			
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			Tighter earnings-stripping rules would curtail a key attraction of 
			inversions, but Treasury has struggled to write such a rule within 
			the constraints of present law, experts said. Fresh legislation from 
			Congress on inversions, despite occasional rhetoric to the contrary 
			from lawmakers on Capitol Hill, is regarded as unlikely before the 
			2016 elections. 
			 
			"The rhetoric is heating up over Pfizer, but I don't see anything 
			immediate on the horizon," said Edmund Outslay, a tax accounting 
			professor at Michigan State University. Nor, he said, did he expect 
			Treasury to act on its own. 
			 
			Corporate tax law consultant Robert Willens said a tighter earnings 
			stripping rule from Treasury was unlikely without action from 
			Congress. But, he said, Treasury could harden its existing rule on 
			"skinny down" restructuring strategies meant to circumvent existing 
			inversion rules. 
			 
			No two inversions are identical, but the goal is usually for a U.S. 
			company to do just enough to satisfy Treasury and IRS requirements 
			for treatment as a foreign entity, while avoiding the actual 
			transfer abroad of core management and research. 
			
			  
			To be recognized as a foreign entity under U.S. law, one key hurdle 
			is to ensure that the original U.S. shareholders own less than 60 
			percent of the combined company. One way to do that is through 
			"skinny down" share buybacks or other distributions that shrink the 
			size of the U.S. company going into the inversion. Treasury likely 
			could tighten that rule, perhaps by extending the time limit on 
			covered transactions, without accompanying legislation from 
			Congress, experts said. "I think that's where they'll focus their 
			attention," Willens said. 
			 
			(Editing by John Pickering) 
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