Which colleges require a Nassau County Certificate of Residence? Generally, you must file a New York State resident income tax return if you are a New York State resident and meet any of the following conditions.Complete the County Certificate APPLICATION (Form B-80) for a Certificate of Residence. The Certificate of Residence should be dated no more than 60 days prior to the start of the semester and no later than 30 days after the semester begins. New hires must report residence information at the time of appointment in the completion of their Comprehensive. Personnel Document (CPD-B). Submit the affidavit to your county with two (2) of the following documents as proof of residency.