Optional annual return filing for small taxpayers allows deemed furnishing when return not filed by the due date. Registered persons with aggregate turnover not exceeding two crore rupees who did not furnish the annual return before the due date are permitted, for specified financial years, to opt to furnish the annual return under the statutory provision read with the relevant rule, and where they have not furnished the return before the due date the return shall be deemed to be furnished on the due date.