IRS Notice 2011-71 provides guidance under section 6050W of

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Notice 2011-71 provides guidance under section 6050W of the Internal Revenue Code regarding the documentation and reporting obligations of payment settlement entities that are United States payors making payment outside the United States to an offshore account.
Notice 2011-71 will be in IRB 2011-37, dated September 12, 2011.
http://www.irs.gov/pub/irs-drop/n-11-71.pdf