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HSN 2918: Acids; carboxylic acid with additional oxygen function…

HSN code 2918 covers: Acids; carboxylic acid with additional oxygen function and their anhydrides, halides, peroxides, peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives.

This code is not separately listed in the rate schedule, so the standard 18% GST applies unless the item is specifically exempt (nil-rated). Confirm against the CBIC rate finder or your CA before billing.

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 2918

This heading has 16 subheadings, including: Acids; carboxylic acids, (with alcohol function but without other oxygen function), lactic acid, its salts and esters, Acids; carboxylic acids, (with alcohol function but without other oxygen function), tartaric acid, Acids; carboxylic acids, (with alcohol function but without other oxygen function); salts and esters of tartaric acid, Acids; carboxylic acids, (with alcohol function but without other oxygen function), citric acid, Acids; carboxylic acids, (with alcohol function but without other oxygen function), salts and esters of citric acid, Acids; carboxylic acids, (with alcohol function but without other oxygen function), gluconic acid, its salts and esters, Acids; carboxylic acids, (with alcohol function but without other oxygen function), 2,2-Diphenyl-2-hydroxyacetic acid (benzilic acid), Acids; carboxylic acids, (with alcohol function but without other oxygen function), chlorobenzilate (ISO)…. Use the HSN/SAC finder to pin down the exact code.

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