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HSN 3815: Reaction initiators
HSN code 3815 covers: Reaction initiators, reaction accelerators and catalytic preparations n.e.c. or included.
It is taxed at 18% GST (per CBIC Notification 9/2025-Central Tax (Rate), effective 22 Sep 2025) — put 3815 in the HSN/SAC column and 18 in the GST % column when you bill it.
Rates reflect the 22 Sep 2025 GST 2.0 reform (mainly 5% and 18%, with 3% for precious metals and 28%/40% for select sin and luxury goods). This is a reference drawn from the CBIC rate schedule, not tax advice — confirm the exact rate for your specific item with your CA.
What's inside 3815
This heading has 4 subheadings, including: Catalysts, supported; reaction initiators, reaction accelerators and catalytic preparations, with nickel or nickel compounds as the active substance, n.e.c. or included, Catalysts, supported; reaction initiators, reaction accelerators and catalytic preparations, with precious metal or precious metal compounds as the active substance, n.e.c. or included, Catalysts, supported; reaction initiators, reaction accelerators and catalytic preparations, with an active substance other than nickel or precious metals or their compounds, n.e.c. or included, Reaction initiators, reaction accelerators and catalytic preparations, unsupported, n.e.c. or included. Use the HSN/SAC finder to pin down the exact code.
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