In 2005, the Board authorized an approved methodology for establishing a system development charge (SDC), along with means for annual indexing. The adjustments are calculated as soon as possible after the Consumer Cost Index for December of the previous year becomes available. The SDC is comprised of two components: improvement (added capacity) and reimbursement (shared capacity). Adjustments are made to both components on an annual basis. The new SDC rates are posted on the Doing Business tab on the Connection Fee & SDC Charges page..