Business RBI external benchmark for bank loans credit negative: Moody's Updated : September 10, 2019 03:44 PM IST Under the new rules. banks will be free to decide the spread over the external benchmark. With interest rates already low on CASA deposits, a bank is unlikely to want them any lower as it will risk losing customers, Moody's said. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.