MUMBAI: The Reserve Bank of India (RBI) today asked all non-banking financial companies (NBFCs), nidhi companies and chit fund companies to submit the annual statutory return on deposits on or before September 30, 1999. The return is required to be submitted by such companies which held public deposits as on March 31, 1999. The residuary NBFCs should similarly furnish the return irrespective of whether it has been granted certificate of registration or its application is pending or its application has been rejected, RBI said in a release here.