Gst turnover exceeds in FY 2019-20 but not taken registration what is best option

Sunil Singh (Proprietor) (199 Points)

07 October 2020  

GST Turnover is 24 lakh in FY 2019-20 and client nat taken registration on time.They have taken registration in sep 2020. Turnover crossed in feb 2020.My Question is 

1.do we charge gst on whole amount or only after crossing the gst limit.

2. how to file earlier returns when gst registration taken in sep 2020 only