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. Residency also implies the student's intent to remain in New York after completing his or her studies.The Shared Residency is an annual application that needs to be renewed for each school year. Short Term Independent Study (STIS). Section 1 -- When is a Student Entitled to Enroll in a District's. 1.