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			 The changes, less than a year before President Barack Obama ends his 
			term, follow sharp political criticism of Pfizer's and Allergan's 
			merger, which would be the largest inversion deal ever. While the 
			rules did not single out this deal, one of the provisions takes aim 
			directly at it. 
 Shares of Dublin-based Allergan fell 22 percent in after-market 
			trading, while shares of New York-based Pfizer rose 3 percent.
 
 The companies said they were reviewing the Treasury Department's 
			notice. "Prior to completing any review, we won't speculate on any 
			potential impact,” the companies said in a joint statement.
 
 The federal government has grappled with a wave of inversions in 
			recent years as U.S. companies have sought to slash their tax bills 
			by redomiciling overseas, though their core operations and 
			management usually remain in the United States even as they claim a 
			new tax home. Several U.S. presidential candidates, including 
			Republican Donald Trump and Democrat Hillary Clinton, have seized on 
			the issue in their campaigns.
 
			
			 
			Obama, a Democrat, has called repeatedly for action by the 
			Republican-controlled U.S. Congress on inversions, but lawmakers 
			have done little. He repeated his appeal to Congress on Monday and 
			said he welcomed the Treasury's action.
 The Treasury said in a statement it will impose a three-year limit 
			on foreign companies bulking up on U.S. assets to avoid ownership 
			limits for a later inversion deal.
 
 "In simple words, Allergan's key deals in the prior 36 months won't 
			be counted (as far as meeting the inversion threshold is concerned) 
			when doing the ownership math for the Pfizer-Allergan deal," 
			Evercore analyst Umer Raffat wrote in a note.
 
 These deals include the $66 billion merger of Allergan Plc and 
			Actavis Plc, the $25 billion purchase of Forest Laboratories and the 
			$5 billion takeover of Warner Chilcott.
 
 "The real issue is not so much what Allergan may prove or disprove, 
			or whether Treasury overstepped its authority. The real question is 
			whether Pfizer reads today's regulations as reason enough to not 
			continue to pursue the deal," Raffat wrote.
 
 Under the agreement between Pfizer and Allergan, either party may 
			terminate the deal if an adverse change in U.S. law would cause the 
			combined company to be treated as a U.S. domestic corporation for 
			federal income tax purposes. The terminating party would have to pay 
			the other company up to $400 million for its expenses, according to 
			the merger agreement.
 
 LEW SAYS LEGISLATION STILL NEEDED
 
 Treasury also said it is proposing rules to tackle a practice known 
			as earnings stripping that is often undertaken following an 
			inversion.
 
 Earnings stripping covers a range of financial dealings that shrink 
			the taxable U.S. profits of multinationals. A common strategy is to 
			load up the U.S. unit of a redomiciled foreign company with debt and 
			then shift U.S. profits to the new lower-tax foreign jurisdiction 
			through interest payments.
 
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			The new Treasury rules would restrict related-party debt for U.S. 
			subsidiaries in dealings that do not finance new investment in the 
			United States. As part of these proposed regulations, the Internal 
			Revenue Service would also be able to divide debt instruments into 
			part debt and part equity, Treasury said. 
			Treasury Secretary Jack Lew said the new actions would "further rein 
			in" inversions, while he repeated his call that only legislation in 
			Congress could prevent such deals.
 But at least one business group, the Organization for International 
			Investment, which advocates for foreign-based companies, condemned 
			the new rules.
 
 "Treasury’s action would increase the cost of investing and 
			expanding across the United States for all foreign companies and put 
			at risk more than 12 million American workers that are supported by 
			foreign direct investment in the United States," Nancy McLemon, the 
			group's chief executive, said in a statement.
 
 Such tax avoidance schemes have long been a thorn in Treasury's 
			side. The proposed deal between Pfizer and Allergan, which would 
			create the world's largest drugmaker, prompted renewed scrutiny.
 
			Pfizer plans to redomicile in Ireland, where Allergan is based, and 
			the companies expect to complete their merger in the second half of 
			this year.
 Last November, following the announcement of the Allergan-Pfizer 
			deal, Treasury clamped down on inversions by limiting a U.S. 
			acquirer's ability to set up a new foreign parent in a third country 
			and to "stuff" assets into a foreign parent to meet post-inversion 
			ownership limits.
 
 On Treasury's latest steps, Senator Charles Schumer of New York, who 
			has been a co-sponsor of legislation to curb inversions, said in a 
			statement: "These regulations will make potential inverters and 
			foreign acquirers think twice before making the leap, and those bad 
			actors should be on notice that we intend to clamp down even 
			further."
 
			 
			(This story has been refiled to correct syntax in headline. It was 
			earlier refiled to add dropped word "Pfizer" in paragraph 3)
 (Reporting by Lindsay Dunsmuir in Washington, D.C. and Carl 
			O'Donnell in New York; Editing by Leslie Adler)
 
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