Most users should use Affidavit of Domicile (MPC 485). If you need to save a partially filled-out form, you may choose to use the alternative form:.Click the link above to access the translation. An affidavit of domicile is a legal document that certifies the residence of a deceased person. Massachusetts Affidavit of Residence Form. Use our Affidavit of Residency form to verify your home address for official purposes. Reason for Affidavit: Briefly state why you need the affidavit, such as "To register to vote,". "For government assistance," or "For legal proceedings.". Ensure the form is tailored for Massachusetts. 2.