gst registration

Not Compulsory

GST registration not required. Please refer here. 

When your business turnover exceeds ₹ 40 Lakhs (₹ 20 Lakhs for North Eastern and hill states) then it is mandatory to take a GST registration. 

[Note: Registration is not applicable if the turnover consists of only exempted goods/services which are exempt under GST, but if it is mix of taxable and non-taxable then a registration is required.]

Source : https://www.cfoangle.com/gst-registration-related-services/