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US Residency Certification Apostille

IRS Apostille


US Residency Certification Apostille- Form 6166


Many U.S. treaty partners require the IRS to certify that the person claiming treaty benefits is a resident of the United States for federal tax purposes. The IRS provides this US residency certification on Form 6166, a letter of U.S. residency certification. Form 6166 is a letter printed on U.S. Department of Treasury stationery certifying that the individuals or entities listed are residents of the United States for purposes of the income tax laws of the United States. You may use this form to claim income tax treaty benefits and certain other tax benefits in foreign countries.

Need to get apostille on US Residency Certification or form 6166? We can assist. For more information about countries that accept apostille, please visit this link
If you need to use the residency certification in countries that are not member of Hague convention, please ask for consular legalization process.
Since IRS issued documents are federally issued documents, the apostille on these documents is issued  by US Department of State in Washington DC. No state in US can issue apostille on these documents. These can’t be copied or notarized in any state for apostille as well.
We require original form 6166 to be mailed to our office in Rockville, MD along with Authentication Transmittal Form. Apostille process takes usually 5 days and thereafter, documents can be sent back to you with FedEx, DHL around the world.
If you are located outside of US, you can also use our concierge service to arrange courier pick up of your document from your office or place of residence. Contact us for price quote.

Authxperts is recommended by US Department of State to travellers to Middle East for their document legalization requirements.


Have you applied for IDP yet? Check out our services page for more details.


Need Visa for China? Contact us for detailed requirements and application forms.


Your Identity history summary check or FBI Report can be expedited through us. We also provide Ink fingerprinting, State of MD background checks, FDLE and FINRA fingerprinting.

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