Other inorganic acids and other inorganic oxygen compounds of non-metals. Chapter 28: Inorganic chemicals, organic or inorganic compounds of precious metals.
The rate depends on what the goods are: the notification gives a different rate to different descriptions. Match your goods to a description in the table below. In force on 7 Nov 2026.
Each row is an entry of a CBIC rate notification that names this heading, a code inside it or its whole chapter, in the notification's own words. Goods take the rate of the entry whose description fits them. GST is CGST plus SGST (or UTGST) in equal halves on a sale within a State, or IGST at the full rate on a sale between States.
| GST | Tariff entry | Description of goods, and source |
|---|---|---|
| Entries for the whole of Chapter 28 (they apply where the description fits) | ||
| 5%2.5% + 2.5% | 28 | Thorium oxalate, Enriched KBF4 (enriched potassium fluroborate), Enriched elemental boron, Nuclear fuel Notification 9/2025-CT(R), Schedule I, S.No. 210 |
| 5%2.5% + 2.5% | 28 | Anaesthetics, Potassium Iodate, Iodine, Steam Notification 9/2025-CT(R), Schedule I, S.No. 211 |
| 5%2.5% + 2.5% | 28 or 38 | Micronutrients, which are covered under serial number 1(g) of Schedule 1, Part (A) of the Fertilizer Control Order, 1985 and are manufactured by the manufacturers which are registered under the Fertilizer Control Order, 1985 Notification 9/2025-CT(R), Schedule I, S.No. 221 |
| 18%9% + 9% | 28 | All inorganic chemicals [other than those specified in notification No.10/2025- Central Tax (Rate) dated 17th September 2025 or other Schedules of this notification] Notification 9/2025-CT(R), Schedule II, S.No. 35 |
| Goods of this heading that fit none of the descriptions above | ||
| 18%9% + 9% | Any Chapter | Goods which are not specified in Schedule I, III, IV, V, VI or VIINotification 9/2025-CT(R), Schedule II, S.No. 639 (the residual entry). A few entries cover goods of any chapter by description, such as puja samagri, rakhi or biomass briquettes; see the list on the finder. |
Every 6- and 8-digit code of heading 2811 in the GSTN HSN master (23 codes), in GSTN's wording. Where a rate entry names a code more exactly than the heading, its rate is shown beside the code.
| Code | Description (GSTN master) | Entry for this code | |
|---|---|---|---|
| 2811 11 | HYDROGEN FLUORIDE (HYDROFLUORIC ACID) | – | |
| 2811 11 00 | HYDROGEN FLUORIDE (HYDROFLUORIC ACID) | – | Save |
| 2811 12 | HYDROGEN CYANIDE (HYDROCYANIC ACID ) | – | |
| 2811 12 00 | Hydrogen cyanide (hydrocyanic acid) | – | Save |
| 2811 19 | OTHER : | – | |
| 2811 19 10 | OTHER INORGANIC ACIDS AND OTHER INORGANIC OXYGEN COMPOUNDS OF NON-METALS - OTHER INORGANIC ACIDS : - OTHER : HYDROCYANIC ACID (HYDROGEN CYANIDE, PRUSSIC ACID) | – | Save |
| 2811 19 20 | HYPOPHOSPHORUS ACID (PHOSPHINIC ACID) | – | Save |
| 2811 19 30 | ACIDS OF ARSENIC | – | Save |
| 2811 19 40 | SULPHONIC ACID | – | Save |
| 2811 19 90 | OTHER | – | Save |
| 2811 21 | CARBON DIOXIDE : | – | |
| 2811 21 10 | DRY ICE | – | Save |
| 2811 21 90 | OTHER | – | Save |
| 2811 22 | SILICON DIOXIDE | – | |
| 2811 22 00 | SILICON DIOXIDE | – | Save |
| 2811 23 00 | OTHER INORGANIC ACIDS AND OTHER INORGANIC OXYGEN COMPOUNDS OF NON-METALS - OTHER INORGANIC OXYGEN COMPOUNDS OF NON-METALS : SULPHUR DIOXIDE | – | Save |
| 2811 29 | OTHER : | – | |
| 2811 29 10 | ARSENIC PENTAOXIDE | – | Save |
| 2811 29 20 | ARSENIC TRIOXIDE | – | Save |
| 2811 29 30 | NITROUS OXIDE | – | Save |
| 2811 29 40 | CARBON MONOXIDE | – | Save |
| 2811 29 50 | SULPHUR TRIOXIDE (SULPHURIC ANHYDRIDE) | – | Save |
| 2811 29 90 | OTHER | – | Save |
Put the code in the HSN column of the tax invoice. Notification No. 78/2020-Central Tax sets the minimum digits by aggregate turnover in the previous financial year: 4 digits (2811) up to ₹5 crore, which may be left off invoices to unregistered buyers, and 6 digits (from the table above) above ₹5 crore. Where the table shows more than one rate, charge the rate of the entry whose description fits the goods sold.
