Quarterly return option for eligible registered taxpayers notified, subject to monthly tax payments and turnover-based eligibility. Notification designates registered persons with aggregate turnover up to five crore rupees who opt for quarterly filing as eligible to furnish returns quarterly, subject to the condition that the return for the preceding month due at the time of opting has been filed; the option continues unless revised. Crossing the turnover threshold during a quarter removes eligibility from the first month of the succeeding quarter. Specified classes who filed the October return by the cut-off are deemed to have opted for monthly or quarterly filing as per the Table, and may change the default option electronically during a prescribed period. The notification has an earlier effective commencement date.