Reminder - 2017 Trenton Tax Returns are due on April 17, 2018. City offices will extend hours on April 16 & 17 (8:00 AM - 7:00 PM on both days). You may also file your tax returns by e-mail firstname.lastname@example.org or fax (513) 428-0168. Documents required at a minimum are copies of W-2's and a copy of the front page of your federal return. We may request additional information if needed.