Harmonized System Code (HS)

The Harmonized System (HS) is the global standard for classifying traded products, maintained by the World Customs Organization (WCO) and used by over 200 countries. The HS uses a standardized 6-digit code structure to classify every physical product in international trade. When people refer to an "HS code," they typically mean these first 6 internationally harmonized digits.

The HS code structure is hierarchical: Chapters (2 digits) group products broadly (e.g., Chapter 61: knitted apparel), Headings (4 digits) provide more specificity (e.g., 6109: T-shirts and vests), and Subheadings (6 digits) offer the finest internationally standardized classification (e.g., 6109.10: T-shirts of cotton). Beyond 6 digits, each country adds its own extensions for tariff and statistical purposes -- this is where the US HTS, EU TARIC, and other national tariff schedules diverge.

Understanding HS codes is essential for accurate cost estimation. Your HS code determines duty rates in every country you sell to, affects whether your products qualify for preferential treatment under free trade agreements (like USMCA or CPTPP), and determines whether additional trade remedies (antidumping duties, countervailing duties, Section 301 tariffs) apply. Your factory should provide the HS code on their commercial invoice, but always verify it independently or with your customs broker.