Customs tariff number

Quick Answer

Last updated: 22 June 2026Published: 19 June 2025

Source: https://taxation-customs.ec.europa.eu/customs-4/calculation-customs-duties/customs-tariff/combined-nomenclature_en

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Definition & Explanation

Unlike the six-digit HS code, which is standardised worldwide, the customs tariff number extends that classification to meet regional and statistical requirements. In the EU, this extension takes the form of the Combined Nomenclature (CN) code at eight digits, serving as the legally binding reference for all customs declarations within the EU customs territory. It determines the duty rate, applicable quotas, anti-dumping measures, and eligibility for preferential treatment. Freight forwarders and customs brokers must identify the correct number with care: misclassification exposes importers to post-clearance duty recovery, fines, and potential shipment delays. Other customs territories apply comparable HS extensions – the digit count varies by jurisdiction, for example ten digits under the US Harmonized Tariff Schedule (HTS).

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