CHENNAI: The Reserve Bank of India (RBI) on Thursday said non-banking finance companies (NBFCs) cannot issue more than Rs 20,000 in cash against gold loans, sending shares of Manappuram Finance and Muthoot Finance down 4% on the bourses. The central bank's move is being seeing as part of its “go digital“ drive post-demonetisation. “The requirements under the Income Tax Act, 1961, as amended from time to time, would be applicable to all NBFCs with immediate effect.Currently, the relevant threshold under the Income Tax Act, 1961 is Rs 20,000,“ the central bank said in a statement.