It is not necessary to write the HNS code in the GST invoice, the person whose turnover is up to 150 lakhs
For more information read the following notifications. Dated-28.06.2017 Notification Number- 12/2017-Central Tax, [TO BE PUBLISHED IN THE GAZETTE OF INDIA, EXTRAORDINARY, PART-II, SECTION 3, SUB-SECTION (i)] Government of India Ministry of Finance Department of Revenue Central Board of Excise and Customs Notification No. 12/2017 – Central Tax New Delhi, the 28th June 2017 7 Ashadha, 1939 Saka
Click here to Notification
Notification Number- 12/2017-Central Tax dated-28.06.2017(in English)
Notification Number- 12/2017-Central Tax dated-28.06.2017(in Hindi)
Other post related to GST