IRS Form 6166 is a document issued by the Internal Revenue Service (IRS) that certifies that a person or entity is a resident of the United States for tax purposes. The form is used to claim treaty benefits on income received from sources outside of the United States.
Form 6166 is a letter of U.S. residency certification, and it is used in place of IRS Forms 1099, W-2, and other tax forms that prove residency for tax purposes. The form contains information such as the taxpayer’s name, address, and tax identification number, as well as the type of income covered by the certification.
The form is typically requested by foreign tax authorities (Example: Bulgaria), such as those in countries with which the U.S. has tax treaties. The foreign tax authority uses the form to verify that the taxpayer is eligible for reduced tax rates or exemptions under the treaty.
To request Form 6166, the taxpayer must complete and submit IRS Form 8802, which is the Application for U.S. Residency Certification. The form must be submitted at least 45 days before the certification is needed, and there is a fee for processing the application.
Do you need an Apostille for Bulgaria?
Bulgaria is a member of the Hague Apostille Convention and any official document issued by the IRS will require an apostille from the US Department of State. Bulgaria joined the Hague Apostille Convention on April 29, 2001. (Convention of 5 October 1961 Abolishing the Requirement of Legalization for Foreign Public Documents).
Obtaining an apostille on your IRS form 6166 for Bulgaria can be complicated. Don’t leave this process to untrained employees or non-professionals who do not fully understand the Apostille process and the unique requirements of certain countries. Your paperwork could be rejected costing you time and money. Don’t let this happen to you!
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