35 Miss. Code R. § 1-08-203
If a municipality uses its own employees to collect any type of delinquent payment owed to the municipality, then from and after July 1, 2000, the municipality may charge an additional fee for collection of the delinquent payment provided the payment has been delinquent for ninety (90) days. The collection fee may not exceed twenty-five percent (25%) of the delinquent payment if the collection is made within this state and may not exceed fifty percent (50%) of the delinquent payment if the collection is made outside this state. In conducting collection of delinquent payments, the municipality may utilize credit cards or electronic fund transfers. The municipality may pay any service fees for the use of such methods of collection from the collection fee, but not from the delinquent payment.
35 Miss. Code. R. § 1-08-203