Registered person who intends to file his GSTR-3B quarterly should indicate the same on GST portal, from the 1st of the second month of the preceding quarter until the last day of the first month of the quarter for which such option is being exercised.
For example: If A wishes to file quarterly returns for the quarter of Jan-Mar 2021, he should opt for quarterly filing on the common GST portal between 1st November 2020 and 31st January 2021.
Once the registered person has opted for quarterly filing, he will have to continue to furnish his return every quarter for all future tax periods, except in the following situations:
If the taxpayer becomes ineligible for furnishing a quarterly return (for example, if the aggregate turnover crosses Rs.5 crore during a quarter, then from the next quarter he will not be able to file quarterly returns).
If the taxpayer opts to furnish GSTR-3B on a monthly basis.
A registered person will not be eligible to opt for furnishing quarterly returns if the last return, which was due on the date of exercising such an option has not been furnished.
For example: If the person is opting for quarterly GSTR-3B filing on 1st December 2020, he will need to furnish his GSTR-3B return for October 2020, which would have been the last return due on the date of exercising the quarterly filing option.