Reduced interest relief for delayed GST returns provides phased nil-interest windows followed by standard interest for specified tax periods. Relaxation prescribes reduced or nil interest for delayed GSTR-3B filings for tax periods February 2020 to July 2020, differentiating two classes of registered persons by aggregate turnover. Each class is allotted specified nil-interest intervals for particular tax months, after which a stated interest rate applies; the relief applies only to persons required to furnish FORM GSTR-3B who failed to file and pay for the listed months. The notification is made operative from the stated retrospective commencement date.