R.I. Gen. Laws § 31-6-5: Reduced fees for portion of year.

(a) If an application for registration of any motor vehicle, trailer, or semi-trailer shall be made in the first quarter of the year appropriate to the individual’s registration expiration, or in the second quarter or the third quarter in any year, the fee for registration shall be three-fourths (¾), two-fourths (2/4), or one-fourth (¼) respectively of the fee required for a full year.

(b) The provisions of this section shall not apply in the case of the registration of motor vehicles used for racing, or for motor vehicles, trailers, or semi-trailers owned by any department or agency of the state of Rhode Island, or by any city, town, or district of this state.