IRS Form 6166 - Certification of U.S. Tax Residency
Form 6166, the Certification of U.S. Tax Residency, plays a crucial role in facilitating international tax treaty benefits and transactions for U.S. taxpayers. It is administered by the Internal Revenue Service (IRS) through a structured process outlined in Form 8802, Application for United States Residency Certification. Here is a summary of important information regarding Form 6166 and the application process: