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HSN 3811: Anti-knock preparations
HSN code 3811 covers: Anti-knock preparations, oxidation and gum inhibitors, viscosity improvers, anti-corrosive preparations and the like, for mineral oils (including gasoline) or other liquids used for the same purposes.
It is taxed at 18% GST (per CBIC Notification 9/2025-Central Tax (Rate), effective 22 Sep 2025) — put 3811 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 3811
This heading has 5 subheadings, including: Anti-knock preparations; based on lead compounds, Anti-knock preparations; other than those based on lead compounds, Lubricating oil additives; containing petroleum oils or oils obtained from bituminous minerals, Lubricating oil additives; not containing petroleum oils or oils obtained from bituminous minerals, Oxidation and gum inhibitors, viscosity improvers, anti-corrosive preparations, other prepared additives for mineral oils or liquids used as mineral oils (including gasoline), n.e.c. in heading no. 3811. Use the HSN/SAC finder to pin down the exact code.
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