check with a pro in your state. it's possible if your state recognizes common law marriages, you're legally married income tax purposes. if your state doesn't recognize common law marriages, being in a domestic partnership may also mean your legally married. some states require the formalization of the partnership to be regarded as married. whether or not you considered legally married is important. if you are, your choices are to file a joint return or file as married filing separately. you can not file as head of household and your partner can't file as single.
