Due Date of a Return Personal income tax returns are due on or before April 15th following the close of each tax year. When the due date for filing tax returns falls on a Saturday, Sunday or legal holiday, the filing may be made on the next succeeding business day. The due date for filing 2014 personal income tax returns is Wednesday, April 15, 2015. Extensions. General Rules: Taxpayers who are unable to meet their income tax filing deadlines may apply for automatic six months extensions of time to file Massachusetts personal income tax returns and to make payments.