As per Notification No 58/2017 – Central Tax, a taxpayer whose turnover is above Rs 150 Lacs during the previous financial year or likely to be in the current financial year has to file GSTR – 1 for the months July 217 to Oct 2017 by 31st Dec 2017, for the month of Nov 2017 by 10th Jan 2018, for the month of Dec 2017 by 10th of Feb 2018, for the month of Jan 2018 by Mar 2018, for the month of Feb 2018 by 10th April 2018 and for the month of March 2018 by 10th of May 2018.