About HSN Code 3815

HSN Code 3815 covers Reaction Initiators, Reaction Accelerators and Catalytic Preparations, not Elsewhere Specified or Included and attracts a GST rate of 18%. For intra-state supplies, this is split as 9% CGST + 9% SGST. For inter-state supplies, 18% IGST is charged.

How to Use HSN Code 3815 on GST Invoices

• Include the HSN code 3815 on every GST invoice for reaction initiators, reaction accelerators and catalytic preparations, not elsewhere specified or included
• Businesses with turnover above ₹5 crore must use 6-digit HSN codes
• Turnover between ₹1.5–5 crore: 4-digit codes are sufficient
• The HSN code must match the product/service description on your invoice
• Incorrect HSN codes can lead to GST notices and ITC mismatches

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