Unclaimed ITC of FY 20-21

Yes, filing GSTR3B filing is mandatory for all the normal and casual taxpayers, including those with no business in the particular tax period.

The late fee will depend upon the number of days of delay from the due date. GST return in GSTR-3B is filed on 23rd January 2021, 3 days after the prescribed due date i.e 20th January 2021. The late fees will be calculated for three days and it should be deposited in cash.