Interest and Charges Interest rates on loans and advances are normally variable. The rates are quoted as a margin over the CBM Discount Rate with an effective single rate being stated in the sanction letter. The rate to be applied would reflect various aspects of credit risk involved, including the type of security offered, the nature of the business, the performance of the business, and the quality of business management. The Advances fees applicable to commercial facilities are those established in the Bank’s Tariff of Charges.