Optional annual return filing for small taxpayers allows late furnishing for specified years with returns deemed filed on due date. Registered persons with an aggregate turnover not exceeding two crore rupees who did not furnish the annual return under sub-section (1) of Section 44 read with rule 80(1) before the due date are permitted, for financial years 2017-18 and 2018-19, to follow a special procedure allowing them the option to furnish the annual return after the due date; such returns shall be deemed to be furnished on the due date if not filed before that date.