(1) The operator will be entitled to credit for fees already paid when an increase in weight and/or change of classification is made on an intrastate registration. No credit will be given on Interstate Registration Plan (IRP) weight increases unless done through the Helena Motor Carrier Services office on the operator's IRP account.

(2) When changing from a more costly gross weight fee classification or weight classification to a less expensive classification no refund shall be given.

(3) Within the same classification, increased gross vehicle weight may be purchased by paying the additional required fees.