The valuation base is a snapshot at a point in time (end February) and is used to calculate the additional rate (Rand-in-the-Rand) for the following financial year. However, municipal valuations can change within a financial year due to interim valuations, Valuation Court rulings, sub-divisions, rezoning or other technical adjustments. Should the valuation base decrease or increase substantially, the City must inform the CID in order to recalculate the CID’s additional rate.