Apostille for U.S. Residency Certification (Form 6166)



IRS Form 6166 (U.S. Residency Certification) is a letter printed on the U.S. Department of Treasury stationary certifying that an individual or a company was / is a resident of the United States for the purposes of 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. To be valid in a foreign country, Form 6166 has to be legalized with an apostille.

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What agency issues U.S. residency certifications and what does Form 6166 look like?

form 6166 us residency certification

tip apostilleIf you have an original Form 6166 - U.S. Residency Certification, please do not have it notarized in order to get an apostille. This document can be apostilled directly. 

Apostille for U.S.residency certification, Form 6166

You have an original Form 6166, and just need an apostille or foreign embassy legalization? As this is a federal document, apostille will be issued by the U.S. Department of State in Washington DC. Please send the original Form 6166 to us, and we will get an apostille for it.


U.S. (federal) apostille: $175 (Fedex within the U.S. is included)
FedEx International is $60 (most countries)
FedEx to Eastern Europe and South America is $90
Processing time: 4-5 bus. days
Complete the Order form and enclose it with your document(s). Our mailing address is
Foreign Documents Express
123 Seventh Avenue, Suite 175
Brooklyn, NY 11215

Need to obtain Form 6166 with an apostille?

We can help!  You can also Order Form 6166 with an apostille/embassy legalization online.

Form 6166 and apostille-price

Form 6166 + apostille: $325 (individuals), $425 (companies)
Processing time: 8-10 weeks.
FedEx International is $60 (most countries)
FedEx to Eastern Europe and South America is $90.

Frequently asked questions about U.S. Residency Certification - Form 6166

How to Who can apply for U.S. Residency Certification - Form 6166?

First of all, you as an individual or your company must qualify as a U.S resident for the tax purposes. You have to pay taxes and file all appropriate tax returns.

Secondly, you need to make sure that you have not filed any forms in the U.S. that show you are a resident of another country.

Then you can apply for U.S. Residency Certification (form 6166). Who can apply for Form 6166?

  • individulas (U.S. citizens, U.S. lawful permanent residents (green card holders), other U.S. residents alien, dual-status U.S. residents, partial year Form 2555 flers)
  • partneships
  • trusts
  • estates
  • corporations
  • S-corporations
  • employee benefit plans/trusts
  • exempt organizations.

How to Can I get From 6166 fast?

Forms 6166 are issued by the IRS. The IRS does not provide expedited service. The processing time can be anywhere between six weeks and three months, sometimes longer depending on the IRS work load and the time of the year.

How to get a U.S. residency certification, Form 6166? (summary)

How can you get Form 6166? Here we will describe the general proceure of obtaining form 6166. Please note that there are a lot of specific requirements depending on the entity type. But the general steps will be as follows:

- You will need to properly complete Form 8802 and submit it to the IRS. The IRS provides detailed instructions on how to fill out this Form.

- Some types of entities will have to submit additional documents along with form 8802. Again, you will find information about these additional documents in the instructions to form 8802.

- You will need to pay the IRS fee which is $85 at the present time.

- Then you can submit the application by fax or by mail.

- Your application will be stored in the IRS computer until its turn to be reviewed. Usually it takes between four and six weeks. If you call the IRS about the status of application before your turn comes, the answer will be that they do not have any information about your application.

- Then, the IRS will start to review your application. When it happens, a standard letter is generated by the IRS computer and mailed to you saying that the IRS received your application and it is being reviewed.

- If you completed Form 8802 correctly and provided all required supporting documents, your application will be approved approximately within 30-45 days from the beginning of the reviewing process (not from the day you submitted the application by fax or your application was received by the IRS by mail)

- If the application is not approved, you will get a letter with request for additional information or a letter stating that your application has been rejected. This correspondence can take a few more weeks. This is why it is essential to do everything right from the very beginning.