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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.
An ERN is a unique reference number used to identify your business. Itâs provided by the HM Revenue and Customs (HMRC) when you register your business as an employer. Typically, your ERN will consist of letters and numbers â with a three digit HMRC office number followed by a forward slash and a unique code that is used to identify your business.