ISC's rate schedules are developed at the beginning of each fiscal year and reviewed quarterly for the first three quarters. Each revenue center charges for goods or services to enable that revenue center to be self-sufficient. Actual costs are accumulated for each revenue center and compared against the revenues received for the corresponding period. Differences between costs and revenues will be evaluated to determine if an adjustment of the rate is required and/or if debits or credits are required to remedy large variances between billing and operating expenses by an individual revenue center. Comparisons are made for each revenue center for the current fiscal year or quarter using the cumulative history of all revenues and expenses and usage that would effect the rate structure. If rate revisions shall be announced to users prior to implementation.
Costs for dedicated charges shall be invoiced on the basis of the actual cash expenditures made by ISC for the benefit of the user and a service has been performed and the invoice is received from the vendor, the charges shall be determined upon receipt of the invoice from the vendor providing the goods or services.
Users will be invoiced on a monthly basis for ISC services. Invoices will show each chargeable service performed for the user during the previous month and will be mailed on or about the fifteenth day of each month. An exception to this schedule is when a user's monthly ISC charges are less than $5.00. Invoices in this category will be held and sent only three times a year: approximately November 15, March 15, and July 15.
W. Va. Code R. § 161-1-4