HSN 2815: Sodium hydroxide

HSN code 2815 covers: Sodium hydroxide (caustic soda); potassium hydroxide (caustic potash) peroxides of sodium or potassium.

It is taxed at 5% GST (per CBIC Notification 9/2025-Central Tax (Rate), effective 22 Sep 2025) — put 2815 in the HSN/SAC column and 5 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.