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Tax considerations for outsourcing freelance work to foreign country
If a person is not a U.S. citizen and they live and work outside the U.S., then any income they make from a U.S. company or person for services provided does not qualify as "U.S. Source income" according to the IRS.  Therefore you wouldn't need to worry about withholding or providing tax forms for them for U.S. taxes.  See the IRS Publication 519 U.S. Tax Guide for Aliens.