Form 6166 is a letter printed on US Department of Treasury stationery certifying that the individuals or entities listed are residents of the United States. Apply for programs, payment agreements, refunds, and pay balances.Search for a property. Use our Affidavit of Domicile form to verify the last home address of a deceased person to speed up the inheritance process. The Declaration of Domicile form must be notarized. You may use the Notary Public of your choice. 1. ❖ Form MV-1 must be completed and a check or money order payable to the Commonwealth of. Citizens can submit their AIRE application online using the Fast-It portal. Instructions on how to apply can be found on the website.