I want to do my citizenship but we never filed our taxes together always seperate and head of household. Would I have problems?

Although I am not familiar with IRS rules, my information is that registering as head of household means that the applicant is either single, divorced, or lived apart six months or more in a calendar year. If you fit none of these categories, you might certainly owe the government some money. I do note that immigration examiners are not IRS employees and do not collect back taxes on behalf of IRS. A naturalization examiner's general mission is the grant or denial of naturalization applications. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.