Rule-59(6) is getting implemented on GST Portal from 1st September 2021. Rule-59(6) of CGST Rules, 2017; inserted vide Notification No. 1/2021 dated 1st January 2021, provides for restriction in filing of GSTR-1 in certain cases : a registered person shall not be allowed to furnish the details of outward supplies of goods or services or both under section 37 in FORM GSTR-1, if he has not furnished the return in FORM GSTR-3B for preceding two months; a registered person, required to furnish return for every quarter under the proviso to sub-section (1) of section 39, shall not be allowed to furnish the details of outward supplies of goods or services or both under section 37 in FORM GSTR-1 or using the invoice furnishing facility, if he has not furnished the