Which taxpayer(s) is/are required to file a federal income tax return for 2017? Juan (28) has gross income of $15,400. He is a qualifying widower with one dependent. Elaine (68) has gross income of $12,150. She is single and has no dependents. Randy (32) has gross income of $4,000. His filing status is married filing separately. Robert (65) and Maria (61) have gross income of $21,500. They wish to file a joint return.