This article explains the General Rules of Interpretation (GRIs) — the six sequential rules used to classify goods under the Harmonized System (HS) — and what they mean for e-commerce merchants shipping cross-border.
What are the General Rules of Interpretation (GRIs)?
The GRIs are rules developed by the World Customs Organization (WCO) to ensure goods are classified under the Harmonized System (HS) consistently. The HS is an internationally standardised system of names and numbers for classifying traded products. GRIs help customs officers, traders, and other stakeholders correctly classify goods as they cross international borders.
The six GRIs
The GRIs consist of six rules that must be applied in sequence.
GRI 1
Classification is determined first by the text of the headings and any applicable Section or Chapter Notes — not by the broader titles of sections or chapters. Section and chapter titles exist for reference only and carry no legal weight.
Example: A leather jacket is classified under "articles of apparel and clothing accessories, of leather" (HS Code 4203) based on the heading text, not under the broader category "manufactures of leather."
GRI 2
GRI 2 covers incomplete or unfinished goods, and goods presented in unassembled or disassembled form.
GRI 2(a): Incomplete or unfinished goods are classified under the same heading as the corresponding complete or finished goods, provided they have the essential character of the finished product.
GRI 2(b): Unassembled or disassembled goods are classified as if assembled, unless the heading or legal notes direct otherwise.
Example: A flat-pack bookshelf is classified under the same heading as an assembled bookshelf (HS Code 9403) because it has the essential character of the finished product.
GRI 3
When goods could be classified under two or more headings, GRI 3 provides the tiebreaker — applied in this order:
GRI 3(a): The heading with the most specific description takes priority over a more general one.
GRI 3(b): If two headings are equally specific, classify based on the material or component that gives the goods their essential character.
GRI 3(c): If still unresolved, classify under the heading that appears last in numerical order.
GRI 4
A fallback for goods that cannot be classified by GRIs 1 through 3. GRI 4 directs that such goods should be classified under the heading for the product they most closely resemble, based on properties, usage, and materials.
Example: An e-reader, not explicitly named in the HS nomenclature, is classified under the same heading as similar electronic devices like tablet computers (HS Code 8471).
GRI 5
GRI 5 determines whether packaging and containers should be classified with the goods they contain or separately.
GRI 5(a): Cases and containers normally sold with the goods they contain, and suitable for repetitive use, are classified with those goods.
GRI 5(b): Packing materials and containers designed for transport are classified with the goods — unless designed for repetitive use, in which case they may be classified separately.
Example: A durable reusable camera case sold with a camera is classified under the same heading as the camera (HS Code 8525).
GRI 6
Once the correct heading is identified, GRI 6 applies the same rules to classify goods at the subheading level. Classification at this level is determined by the terms of the subheadings and any related Subheading Notes.
Example: Roasted coffee beans are further classified into subheadings based on whether they are decaffeinated (HS Subheading 0901.21) or not (0901.22).
Why GRIs matter for e-commerce
Correct HS classification affects duty rates, import and export restrictions, and compliance with local laws across every market you ship to. Misclassification can result in penalties, shipment delays, and customs disputes.
Two rules come up most often for e-commerce:
GRI 2 applies to products shipped unassembled — for example, a DIY furniture kit is classified based on its assembled state.
GRI 3(b) applies to products with multiple functions — for example, a smartwatch might be classified based on whether its essential character is as a timepiece or as a smart device.