1) a taxpayer having a turnover exceeding Rs 5 crore is required to follow the HSN code of 4 digits 2)taxpayers with turnover between Rs 1.5 Crores and Rs 5 Crores in the preceding financial year, HSN codes may be specified only at 2-digit 3)eight digits code will be mandatory in case of export and imports under the GST regime. 4)Taxpayers whose turnover is below Rs. 1.5 crores are not required to mention HSN Code so plz check your criteria than choose any one option