GSTR-1 due date extended for certain high-turnover registered persons to the following month's statutory deadline for specified months. Extension of the filing deadline is prescribed for furnishing Form GSTR-1 by registered persons whose aggregate turnover exceeds the statutory threshold, for each month from April to September 2020, with the due date fixed as the eleventh day of the month succeeding each relevant month; the corresponding time limit for the summary return for the same months will be notified subsequently, and the notification is deemed to have an earlier date of effect.