(a) Notwithstanding the provisions of any special act, municipal charter or home rule ordinance, (1) for the assessment year commencing October 1, 2016, the mill rate for motor vehicles shall not exceed 39 mills, (2) for the assessment years commencing October 1, 2017, to October 1, 2020, inclusive, the mill rate for motor vehicles shall not exceed 45 mills, and (3) for the assessment year commencing October 1, 2021, and each assessment year thereafter, the mill rate for motor vehicles shall not exceed 32.46 mills.

(b) Any municipality or district may establish a mill rate for motor vehicles that is different from its mill rate for real property and personal property other than motor vehicles to comply with the provisions of this section. No district or borough may set a motor vehicle mill rate that if combined with the motor vehicle mill rate of the town, city, consolidated town and city or consolidated town and borough in which such district or borough is located would result in a combined motor vehicle mill rate (1) above 39 mills for the assessment year commencing October 1, 2016, (2) above 45 mills for the assessment years commencing October 1, 2017, to October 1, 2020, inclusive, or (3) above 32.46 mills for the assessment year commencing October 1, 2021, and each assessment year thereafter.

(c) Notwithstanding the provisions of any special act, municipal charter or home rule ordinance, a municipality or district that set a motor vehicle mill rate prior to May 7, 2022, for the assessment year commencing October 1, 2021, may, by vote of its legislative body, or if the legislative body is a town meeting, the board of selectmen, revise such mill rate to meet the requirements of this section, provided such revision occurs not later than June 15, 2022.

(d) Notwithstanding the provisions of § 12-112, any board of assessment appeals of a municipality that mailed or distributed, prior to October 31, 2017, bills to taxpayers for motor vehicle property taxes based on assessments made for the assessment year commencing October 1, 2016, shall hear or entertain any appeals related to such assessments not later than December 15, 2017.

(e) For the purposes of this section, “municipality” means any town, city, borough, consolidated town and city, consolidated town and borough and “district” means any district, as defined in § 7-324.