General Rules of Interpretation

The General Rules of Interpretation (GRI, sometimes GIR) are the six legal rules that govern how any good is assigned a code under the Harmonized System. They are the legal backbone underneath HS Code Classification: where the classification page says what code a product gets, the GRI say how that decision is legally reached and defended when a product could plausibly fall under more than one heading. Per the WCO, they "must be applied in consecutive order" and "constitute the backbone" of commodity classification — so the same GRI logic ultimately sets every figure in Tariffs & Duties → Landed Cost → Cost of Goods Sold (COGS).

Firewall: every claim below is what a source reports. See ../../CONTEXT.md Rule 1.

How the six rules work

Per WCO Trade Tools, the GRI are applied in order, and a correct classification places a good in exactly one heading/subheading to the exclusion of all others.

• GRI 1 — classification is determined first by the terms of the headings (4-digit) and the relative Section and Chapter Notes. The notes are binding legal text, not commentary — most goods are classified at GRI 1 alone. (WCO Trade Tools)
• GRI 2(a) — an incomplete/unfinished article is classified as the finished article if it already has its essential character; unassembled or disassembled goods are classified as the assembled article. (Zonos, vendor paraphrase — see firewall flag in source)
• GRI 2(b) — a reference to a material includes mixtures/combinations of it; goods of more than one material are then sent to GRI 3. (WCO GIR text)
• GRI 3 — applies when a good is prima facie classifiable under two or more headings, and has three sub-rules applied in strict sequence:
  • 3(a) most specific description wins ("a description by name is more specific than a description by class"). (WCO GIR text)
  • 3(b) if 3(a) can't decide, classify by the material/component giving the good its essential character. (US CBP ICP)
  • 3(c) if still undecided, classify under the heading occurring last in numerical order among those equally meriting consideration. (US CBP ICP)
• GRI 4 — goods not classifiable under 1–3 go to the heading for the goods to which they are most akin. (WCO Trade Tools)
• GRI 5 — (a) specially-fitted cases/containers (camera, instrument, gun cases) are classified with their article when normally sold together, unless the case gives the whole its essential character; (b) packing materials entered with goods are classified with them unless clearly suitable for repetitive use. (Zonos, vendor)
• GRI 6 — classification at the subheading (6-digit) level uses the terms of the subheadings and subheading notes, mutatis mutandis by the same logic as GRI 1; only subheadings at the same level are comparable. (WCO Trade Tools)

Per WCO Trade Tools, the first four rules are applied in consecutive order, while GRI 5 and GRI 6 apply throughout the process.

Key terms

Term	Meaning (per sources)
Heading	4-digit level resolved under GRI 1 (WCO)
Subheading	6-digit level resolved under GRI 6 (WCO)
Section / Chapter Notes	Binding legal text consulted under GRI 1 (WCO)
Essential character	The deciding criterion in GRI 2(a) and GRI 3(b) (CBP / Zonos)
Most specific description	GRI 3(a) preference; "by name" beats "by class" (WCO GIR)
Last in numerical order	GRI 3(c) tie-breaker (CBP)
Most akin	GRI 4 fallback for otherwise-unclassifiable goods (WCO)

Apparel / textile application (Section XI)

The GRI interact heavily with Section XI legal notes for fashion goods — and often the notes, not GRI 3, settle the case:

• Chief-weight rule — Section XI Note 2 forces classification by the predominant fibre by weight, not by appearance. (USITC HTS Section XI)
• Single-material treatment — where a heading refers to goods of different textile materials, they are treated as one material; choose the Chapter first, then the heading, disregarding materials not classified in that Chapter. (GOV.UK)
• Garment sets — Section XI Note 14: textile garments of different headings stay in their own headings even when put up as retail sets ("textile garments" = headings 61.01–61.14 and 62.01–62.11). (WCO HS 2022)
• Suits & ensembles — handled by Chapter 62 Note 3 (headings 6203/6204) rather than the generic GRI 3 set rule. (US CBP "Classification of Sets")
• Finished-edge test — under Section XI legal Note 7, a rectangular fabric piece (e.g. a sari) must have at least one of its two shorter edges finished to count as a garment. (GOV.UK)

This is why, per GOV.UK, the knit (Ch 61) vs woven (Ch 62) decision is made first — it is the GRI 1 / Section-Note step that everything downstream depends on (carried from HS Code Classification).

EU / Combined Nomenclature framing

Per the European Commission, the GRI are "the core of the customs tariff classification" and set how goods are classified into Combined Nomenclature headings; the CN is HS6 + EU 8-digit subdivisions. For contested cases, Binding Tariff Information (BTI) is a legal classification decision valid EU-wide, generally for 3 years (as-of 2026-06-28) — the EU instrument that locks in a GRI-derived classification (links to the EU BTI / UK ATaR / US CBP CROSS binding-ruling cluster under HS Code Classification).

Contradictions

Gaps

• No verbatim full GRI 1–6 legal text captured this run (fetcher had no WebFetch) — exact ordered text should be pulled from the WCO GIR PDF and USITC HTS General Rules.
• GRI 4 ("most akin") and GRI 1's handling of Section/Chapter Notes only thinly sourced.
• No worked apparel ruling extracted (candidate: CBP ruling N184919) to show GRI 1 + Section XI in a concrete case — a future frontier is a CBP CROSS Ruling / Binding Tariff Information (BTI) worked example.
• Both practitioner streams down (Reddit MCP + Apify YouTube transcripts not connected) — no operator counter-narrative on essential-character (GRI 3b) disputes or surprise reclassifications.
• Running UNIQLO-Europe gap: no UK/EU fashion-primary GRI/Section-XI worked example or misclassification-penalty benchmark located.

Related

HS Code Classification · Tariffs & Duties · Rules of Origin · De Minimis · Binding Tariff Information (BTI) · Essential Character · Section XI (Textiles)