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.Get a certified copy of your birth certificate. Driver's License or State ID: As it shows your permanent residence, a valid U.S. driver's license can act as proof of domicile. Some states classify you as a full-year resident if you lived there for at least 183 days, although others have different thresholds. How Do I Fill Out an Affidavit of Domicile?