Use this form to request Form 6166, a letter of U.S. residency certification for purposes of claiming benefits under an income tax treaty or value added tax (VAT) exemption. You cannot use Form 6166 to substantiate that U.S. taxes were paid for purposes of claiming a foreign tax credit.
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Other Items You May Find Useful
About Publication 519, U.S. Tax Guide for Aliens
About Publication 947, Practice Before the IRS and Power of Attorney
Comment on Form 8802
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