About HSN Code 2521

HSN Code 2521 covers Limestone Flux; Limestone and Other Calcareous Stones, of a Kind Used for the Manufacture of Lime or Cement and attracts a GST rate of 5%. For intra-state supplies, this is split as 2.5% CGST + 2.5% SGST. For inter-state supplies, 5% IGST is charged. This code falls under the Chemicals & Materials sector (Paint, fertilizer, rubber, plastics, pharma).

How to Use HSN Code 2521 on GST Invoices

• Include the HSN code 2521 on every GST invoice for limestone flux; limestone and other calcareous stones, of a kind used for the manufacture of lime or cement
• 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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Last verified: 2026-06-26 · Source: CBIC Master Tariff