Extended Hours for Tax payments Posted August 19, 2019 by Jesse Bridge & filed under Announcement, Office Hours. Taxes are due September 9, 2019. The Town of Mendon will have extended office hours as follows: Thursday September 5 open 8:00am – 6:00pm Friday September 6 open 8:00am -12:00pm Monday September 9 open 8:00am – 6:00pm