What is the GST (IGST) rate for HSN code 28151110?

HSN code 28151110 (Caustic Soda) attracts 18% IGST under Schedule II of the GST notification.

What is the customs duty (BCD) for HSN code 28151110?

The Basic Customs Duty (BCD) for HSN code 28151110 is 7.50%. On import, the landed duty also adds Social Welfare Surcharge (on BCD) and IGST (on the duty-inclusive value).

What does HSN code 28151110 cover?

HSN code 28151110 covers Caustic Soda. It sits under Chapter 28 – Inorganic chemicals, organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes, in Section VI – PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES.

What is the unit of measurement for HSN code 28151110?

The standard unit of quantity (UQC) for HSN code 28151110 is kg, as listed in the Customs Tariff.

HSN Code Finder · Product

Caustic Soda HSN Code 2815

Q: What is the HSN code for Caustic Soda?

The HSN code for Caustic Soda is 28151110, classified under Chapter 28 – Inorganic chemicals, organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes of India's Customs Tariff (ITC-HS).

Q: What is the HSN code for caustic soda?

Solid sodium hydroxide falls under sub-heading 281511 — flakes under 28151110 and other under 28151190, within heading 2815.

18% IGSTSchedule II

Sodium hydroxide (caustic soda) is classified under HSN heading 2815. Solid caustic soda in flakes and other solid forms each have their own tariff item.

Search any HSN code

Heading

2815

Primary code

28151110

GST / IGST

18%

Customs duty (BCD)

7.5%

Caustic Soda HSN codes & GST rates

The 8-digit HSN/HS codes under heading 2815 (sodium hydroxide (caustic soda); potassium hydroxide (caustic potash); peroxides of sodium or potassium). Click any code for the full duty stack, IGST schedule and FTA preferential rates.

HSN code	Description	IGST	BCD
28151110	Flakes	18%	7.5%
28151190	Other	18%	7.5%

FTA preferential rates: 9 partner agreement(s) listed for 28151110; best preferential rate 0% via Japan; 5 partner(s) at 0%. See full FTA breakdown →

What is the HSN code for caustic soda?

The HSN code for caustic soda is 2815 at the 4-digit heading level. For GST invoicing and customs filing you generally need the full 8-digit tariff item — for caustic soda the most common is 28151110, which attracts 18% IGST.

HSN (Harmonized System of Nomenclature) codes are India's standardised product-classification system used for both GST and customs. The first 2 digits are the chapter, 4 digits the heading, 6 digits the international subheading and 8 digits the India-specific tariff item. Always confirm the exact 8-digit code for your specific variant, and verify the rate against the latest CBIC/DGFT notification before filing.

How caustic soda is classified under HSN

The HSN classification for caustic soda narrows down level by level — from the broad section to the specific 8-digit tariff item used on your invoice and Bill of Entry.

Chapter 282-digitInorganic chemicals, organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes
28154-digit headingSODIUM HYDROXIDE (CAUSTIC SODA); POTASSIUM HYDROXIDE (CAUSTIC POTASH); PEROXIDES OF SODIUM OR POTASSIUM
2815116-digit subheadingSolid :
281511108-digit tariff itemFlakes

Section VI — PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES

GST on caustic soda

Caustic Soda (HSN 2815) attracts 18% GST under GST Schedule II. On a sale within the same state this is charged as 9% CGST + 9% SGST; on an inter-state sale or an import it is charged as a single 18% IGST. This is the rate recorded for the primary code 28151110 — other variants in the table above can carry different rates, so match your exact product and verify against the latest CBIC GST rate notification.

Customs duty on imported caustic soda

When caustic soda (HSN 28151110) is imported into India, the duty stack is approximately: Basic Customs Duty (BCD) 7.5%, AIDC 7.5%, Social Welfare Surcharge on the aggregate of customs duties, plus IGST 18% on the assessable value plus duties.

Indicative total duty on ₹100 of assessable value: ₹28.4651. This is an estimate — the actual amount depends on valuation, exemptions and the notifications in force on the date of import.

See the full duty breakdown for 28151110 →

Conclusion

The HSN code for caustic soda is 2815 at the heading level, with 28151110 the most commonly used 8-digit tariff item (18% GST). Always pick the 8-digit code that matches your exact product variant from the table above, and confirm the GST rate and customs duty against the latest CBIC/DGFT notifications before invoicing or filing a Bill of Entry.