The encyclopedia · Engineering & Operations · Technical decision · 1983-1988
The Harmonized System gave every traded good one code every customs can read
The WCO's six-digit HS code made the world's customs, tariffs and trade statistics all speak one language.
World Customs Organization
the move
Goods move across borders, but the way countries described them did not. Every customs administration built its own tariff nomenclature, so the same object could be called, counted and taxed differently at each frontier, and trade statistics could not be compared at all.
The World Customs Organization developed the Harmonized Commodity Description and Coding System, known as the Harmonized System or HS — a nomenclature of transportable goods that became a universal language for identifying and coding merchandise traded internationally. Its structure assigns each product a six-digit code.
The WCO drew up the international convention on the HS and the codes entered force on 1 January 1988. Since then almost every economy has used the HS as the basis of its customs tariffs and the collection of trade statistics, and it is revised on a five-year cycle to reflect changes in technology and patterns of trade.
The result is that two countries refer to a product by the same code, so tariffs, rules of origin, trade data and disputes can all share a single reference rather than a translation table. A classification is no longer a local opinion.
why it works
- Different countries described the same goods in different terms
- A single six-digit code gives every traded product one international identity
- Tariffs, statistics and rules of origin can all point at the same code
- The HS entered into force on 1 January 1988 and is revised every five years
what transfers
When a shared reference can remove per-border re-interpretation, one standard code is worth more than any number of good customs officials.
what came after
The Harmonized System became the backbone of world customs and trade statistics, used by nearly every economy for tariffs and data. It is revised on a five-year cycle and its code expands into national tariffs that add digits beyond the common six. The idea that a shared standard catalogue removes per-border re-interpretation underpins modern trade agreements and data systems worldwide.
references
- The Harmonized System, 30 years old and still going strong!
- World Customs Organization — paper to the UN Statistical Commission
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