Optional annual return filing for small taxpayers permits deemed on time submission for specified financial years under a special procedure. Notification allows registered persons whose aggregate turnover does not exceed the small taxpayer threshold and who did not furnish the annual return under section 44(1) read with sub rule (1) of rule 80 before the due date, to follow a special procedure and opt to furnish the annual return for financial years 2017-18 and 2018-19; such returns shall be deemed to have been furnished on the due date if not filed earlier.