Fiancé didn’t file taxes, will that be an issue when I sponsor him for a green card ?

I do not see your fiancé's tax filings being the focus of his marriage based green card application. The focus is usually upon the bona fides of the marital relationship and other grounds of inadmissibility.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.