Republican Whip Jon Kyl on Thursday blocked the Senate's attempt to pass by unanimous consent a similar bonus-tax bill.

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For small business owners who operate as a pass-through entity (a partnership or a sub S), the bonus depreciation deduction ultimately comes through on their individual tax returns.

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It provides support for arguments by U.S. companies that they face a competitive disadvantage in the U.S. marketplace, since most non-U.S. multinationals except Japan already have lower taxes before the added bonus of an effective tax rate reduction when they establish an American subsidiary.

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