You could write a letter or a declaration under penalty of perjury that attests to the person's residency. How Do I Fill Out an Affidavit of Domicile?File Form 502CR with your Maryland income tax return,. Moving to a new state? From getting a new license to filing taxes, here's our guide to establishing residency in a new state once you move. Don't have utility bills? Maryland Affidavit of Residence Form. Use our Affidavit of Residency form to verify your home address for official purposes.