let's not talk residency but domicile. you can be a resident of many states but you can only have one domicile at a time. so what is your state of domicile?
Domicile is a person’s permanent place of dwelling. It is a legal relationship between a person and a locality. It may or may not be the same as a person's state of residence (not permanent).
For purposes of income taxes, “domicile” means a legal residence which is the place where a person has a fixed dwelling with an intention of making it his/her permanent home.
Domicile is a combination of two factors namely, residence and intent to remain. As the term domicile includes residence, the scope and significance of the term domicile is larger than the term residence.
Pennsylvania
Submit exemption Form REV-419 to your employer if you work in Pennsylvania but are a resident of Indiana, Maryland, New Jersey, Ohio, Virginia, or West Virginia
Maryland
Submit exemption Form MW507 to your employer if you work in Maryland and are a resident of the District of Columbia, Pennsylvania, Virginia, or West Virginia.
for this year and maybe 20201 you'll need to file returns in both states. file a resident state return for your state of domicile. file a nonresident return reporting no income in the other state so you can get back your withholding.
