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The HSN is a multipurpose international product terminology acknowledged by the World Customs Organization. The purpose of using the HSN codes is to ensure that GST billing practices are in accord with international standards of product nomenclature.
The Harmonized Commodity Description and Coding System, also known as the Harmonized System (HS) of tariff nomenclature is an internationally standardized system of names and numbers to classify traded products.nder the HS Convention, the contracting parties are obliged to base their tariff schedules on the HS nomenclature, although parties set their own rates of duty. The HS is organized into 21 sections and 96 chapters, accompanied with general rules of interpretation and explanatory notes.