How are Business Rates Calculated? Business Rates are calculated by multiplying the “rateable value” (RV) of the commercial property by the “business rate multiplier”. For e.g., if your commercial property’s rateable value is £28,000 per annum, your business rates will be calculated as follows. £28,000 (RV) X 49.9 pence (0.499) (business rates multiplier for 2021-22): £13,972 (payable...