For dealers solely engaged in B2C transactions with a turnover not exceeding ₹1.5 crore, an HSN summary is not compulsory for GSTR 1. While HSN codes are mandatory for all B2B invoices, they are optional for B2C invoices. Therefore, if your business only deals with B2C sales, you do not need to include the HSN summary.
A𝐏𝐑𝐈𝐋 𝟐𝟎𝟐𝟏 The Taxpayers whose aggregate Turnover is up to Rs. 5 crores in the preceding Financial Year HSN / SAC code of 4 digits is mandatory for all the B2B tax invoices and optional for B2C tax invoices on the supplies of Goods and Services.