No need to register In GST to the extent of turnover 20 Lacs. However No exemption of 20 Lacs shall be available if you receive or supply any inter state goods & service. with regard to serial Number In invoice you can opt any method i.e. INV0001, INV0002 or INV/785881/1, but make sure total digit must not exceeding 16,
Thanks & Regards
HR & Labour, Corporate Laws Advisor
3rd July 2017 From India, Agra
Thanks for confirming we'll continue to use as following... Hope I was able to clarify that we'll be using invoice based on customer id and as you said it does not exceed 16 digit alphanumeric invoice no.
Customer UID: 785881
Invoice No.: INV/785881/1, etc.
Customer UID: 785882
Invoice No.: INV/785882/1, INV/785882/2, INV/785882/3, etc.
Customer UID: 785883
Invoice No.: INV/785883/1, INV/785883/2, etc.
3rd July 2017 From India, New Delhi