As per Notification No 57/2017 – Central Tax , any taxable person who has a turnover of Rs 150 Lacs in the last financial year or this year can file GSTR – 1on quarterly basis. The return for the period July 2017 to Sep 2017 has to be filed by 31st Dec 2017, for the period Oct 2017 to Dec 2017 by 15th Feb 2018 and for the period Jan 2018 to March 2018 by 30th April 2018. For this to be effective sub-section (2) of section 38 and sub-section (1) of section 39 of the CGST Act has to be amended accordingly.