There are big changes coming regarding tax return filing deadlines for tax year 2016 (filing in 2017). The President just signed a new highway bill that changes due dates for the following returns: Partnerships will be due on 3/15 instead of 4/15. They can be extended to 9/15 (6 months). Corporations will be due on 4/15 instead of 3/15. They can be extended to 9/15 (5 months). Trust returns will be eligible for a 5 1/2 month extension Non-profit returns will get a 6 month ext