HSN digits required on tax invoice in GST Jun 29, 2017 by ConsultEase Administrator in GST Compliances HSN digits required on tax invoice in GST HSN digits required on tax invoice in GST. CBEC vide there notification 12/2017-Central Tax,dt. 28-06-2017 has prescribed the limit for the same. As per this notification the taxpayer having turnover of less than 1.5 Crore are not required to mention the HSN codes. ConsultEase Administrator Consultant Faridabad, India As a Consultease Administrator, I'm responsible for the smooth administration of our portal. Reach out to me in case you need help. Discuss Now Opinions & information presented by ConsultEase Members are their own.