If you file a joint tax return, you have to choose a state of residency for both of you. You would likely be a part-year resident of both states and should file as such if you file joint state tax returns. Otherwise, you could file separate state tax returns. In that case, you would be a part-year resident of both states and your spouse would only file a resident return in Maryland, assuming he or she did not move to Kentucky during the year.
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