In international trade each product is assigned a particular classification code using the Harmonized Commodity Description and Coding System or simply Harmonized System (HS).

The HS is the universal economic language and code for goods authored by the World Customs Organization (WCO). It is a six-digit Code common among all WCO member countries.


The ASEAN Harmonized Tariff Nomenclature (AHTN) is an eight-digit HS-based commodity nomenclature common among the 10 ASEAN Member States.

Philippine Subheading

Beyond the 8-digit AHTN level, the Philippines assigns alpha-numeric codes to provide for its national tariff lines.