Harmonized System (HS)
The Harmonized System (HS) is the international nomenclature for the classification of goods in international trade, developed and administered by the World Customs Organization (WCO). More than 200 countries use it as the foundation for their customs tariffs and trade statistics, making it the common language of global commerce.
In Detail
The HS is organized into 21 sections, 97 chapters, and over 5,000 six-digit subheadings. The six-digit level is internationally standardized: any good classified at 8471.30 in the United States is classified at 8471.30 in the European Union, Japan, and every other HS contracting party. This standardization enables trade data comparison across countries and simplifies compliance for multinational supply chains.
The WCO revises the HS on a five-year cycle—most recently in 2022—introducing new headings for emerging products, splitting or consolidating existing subheadings, and updating the Explanatory Notes that provide interpretive guidance. Countries must update their national tariff schedules to reflect each revision, which is why an HTS code used under the 2017 HS may not be valid under the 2022 schedule.
The HS covers only the first six digits of a classification. Countries add their own digits beyond the sixth: the United States uses digits 7–10 in the HTSUS, the EU adds digits 7–8 in its Combined Nomenclature, and so on. These national additions are not internationally standardized and do not transfer across borders. A foreign supplier's 10-digit export code and a U.S. importer's 10-digit HTSUS code will share six digits but diverge after that.
Classification Significance
The six-digit HS subheading is the internationally agreed anchor for classification. A defensible six-digit determination, grounded in the WCO Explanatory Notes, provides strong classification certainty in any country using the HS. Errors at the six-digit level propagate through to the national 8–10 digit level, making correct heading and subheading classification the most consequential steps in the GRI process.
How Kanon Handles This
Kanon's corpus includes the full text of HTSUS headings and subheadings, which align with HS nomenclature at the 6-digit level. Classification reasoning is grounded in the international HS structure before resolving U.S.-specific 8–10 digit subdivisions and Chapter 99 trade remedy overlays.