This discussion addresses the process of filing a final GST return when a GST number has already been cancelled by the department. The consensus is that a final return (GSTR-10) can typically be filed directly within 90 days of the cancellation order being issued, even if the GST number is no longer active. However, some users noted instances where this was not straightforward, suggesting it might depend on having filed all pending returns first.
07 June 2020
I don't know but I think final return will be open after you filed all pending return of your GSTN. if it is possible then I would like to know. P.s. there are many cases where GSTN cancelled after application but still not able to file final return.