return unfiled

penalty upto sep.17 return are waive off. from oct 17, rs 20.00 per day penalty are applicable for gstr3b, there is no penalty for Gstr1.

@ Mr Rajesh.,

Are You (the firm) under Regular scheme or Composition scheme...?

It is not penalty but is Late fees.
Late fee for Nil Return - Rs. 20/day (CGST Rs 10 & SGST Rs 10)
Other than Nil return - Rs. 50/day (CGST Rs 25 & SGST Rs 25).
Maximum late fee Rs 10000 /month.

Also pay 18% per Annum interest for late payment for all outstanding payments. 

Late fee is auto calculated by gst portal while submitting returns.

thanks everyone , could we close the firm without depositing late fees
or is there any amnesty scheme to waive off late fees

unless you clear your liabilities, you can't close or cancel GST registration.
you have to file returns by paying late fee and interest till date.