Quick answer
GIR 1–6 are the legal engine of every HS classification. Here is how customs authorities actually apply them.
Every classification dispute in the world — a CBP ruling in New York, a BTI in Brussels, a classification notice in Hanoi — is argued through the same six General Interpretative Rules. If you understand them, you can predict how customs will decide.
GIR 1: heading texts and Notes rule everything
Classification is determined by the terms of the headings and the Section/Chapter Notes. Marketing names are irrelevant. Example: a "smart watch" is not classified as a watch of Chapter 91 by its name — Note 3 to Chapter 91 and the terms of heading 8517 must be examined to decide whether communication or timekeeping gives its character.
GIR 2: incomplete goods and mixtures
2(a): an unassembled bicycle shipped in a carton is still a bicycle (8712) if it has the essential character of the complete article. 2(b): references to a material include mixtures — the basis for moving to GIR 3 when mixtures create two candidate headings.
GIR 3: when two headings compete
3(a): the most specific description wins — "electric shavers" (8510) beats "electro-mechanical domestic appliances" (8509). 3(b): sets and composite goods follow the component giving essential character — a gift set of pasta, sauce and grater is classified by the pasta. 3(c): if still tied, the heading last in numerical order wins.
GIR 4, 5 and 6
GIR 4 (goods most akin) is rarely used — it is a signal your description is too thin. GIR 5 covers cases and packing: a violin case entered with the violin follows the violin; packing "clearly suitable for repetitive use" does not. GIR 6 repeats the whole method at subheading level: compare only subheadings of the same level, with their Subheading Notes.
Practical takeaway
Write your product description in GIR language: what it IS, what it is made of, what gives it its essential character. That is exactly the reasoning path our AI follows — and the format a customs officer expects to read.
2026 U.S. legal authority and practice note
Legal review date: September 5, 2026. The USITC online HTSUS identified 2026 Revision 18 on this review date. The version effective on the actual entry date controls.
Article-specific legal clarification
Apply the General Rules of Interpretation in sequence. GRI 1 starts with the terms of the headings and relevant Section or Chapter Notes; GRI 2–5 are used only when their prerequisites are met, and GRI 6 governs classification at the subheading level. U.S. Additional Rules of Interpretation and Additional U.S. Notes can then affect the national 8- and 10-digit result.
Hierarchy and weight of classification authority
| Authority | U.S. legal significance |
|---|---|
| HTSUS heading/subheading text and Section/Chapter/Additional U.S. Notes | Statutory tariff text; apply through the GRIs and U.S. Additional Rules of Interpretation. |
| WCO Explanatory Notes | Persuasive guidance for interpreting the international HS, but not U.S. statutory text. |
| CBP ruling under 19 CFR Part 177 | Binding on CBP for the requester and merchandise covered by the ruling's facts, subject to modification/revocation and later legal changes; similar CROSS rulings may be persuasive. |
| Court of International Trade / Federal Circuit decision | Controlling judicial precedent within its jurisdiction; factual and procedural posture must match. |
| Broker, vendor or database code | A lead only; it does not transfer the importer's legal responsibility. |
Importer-of-record standard and current-entry controls
Under 19 U.S.C. 1484, the importer of record must use reasonable care to enter, classify and value the merchandise and provide information needed for admissibility, even when a licensed broker files the entry. Negligent, grossly negligent or fraudulent material statements or omissions can be penalized under 19 U.S.C. 1592. Preserve a written classification file and records required by 19 U.S.C. 1508 and 19 CFR Part 163, generally for five years.
Before relying on this article for an entry, independently verify: 1. the exact 10-digit HTSUS number in the current schedule and any required Chapter 99 number; 2. customs value under 19 U.S.C. 1401a and nonpreferential/preferential origin; 3. Section 301/232, safeguard, quota and exclusion status on the entry date; 4. every potentially relevant AD/CVD written scope—scope text is dispositive and HTS references are only for convenience; and 5. all PGA admissibility, certification, labeling, reporting and ACE data requirements.
For a recurring, novel or high-value classification, request a prospective CBP ruling under 19 CFR Part 177 with complete facts. An FAQ, search result or AI output is not a ruling and does not by itself establish reasonable care.
Official legal sources
- USITC — Current Harmonized Tariff Schedule of the United States
- CBP — User fee table: MPF rate and FY 2026 minimum/maximum
- CBP — Harbor Maintenance Fee
- CBP — ACE: filing customs and Partner Government Agency data
- USTR — Section 301 tariff actions and exclusion search
- BIS — Section 232 steel and aluminum measures
- Commerce — AD/CVD FAQs, scope and circumvention rules
- Commerce — ACCESS AD/CVD proceeding search
- CBP — UFLPA rebuttable presumption
- CPSC — Certificates and mandatory eFiling guidance
- FDA — Importing food products into the United States
- EPA — TSCA requirements for importing chemicals
- PHMSA — Lithium battery transportation requirements
- FCC — Equipment authorization
- eCFR — 19 CFR Part 177: administrative rulings
- eCFR — 19 CFR Part 134: country-of-origin marking
- eCFR — 19 CFR Part 163: recordkeeping
> Legal notice: “The 6 GIR rules explained with real examples” provides general information, not transaction-specific legal advice or an agency ruling. Verify the law, tariff edition, facts and agency instructions in effect on the entry date.
Editorial note
Prepared by the Global HS Code Checker Editorial Team for customs-classification, tariff and import-policy research. The correct code and applicable measures may change with the merchandise's actual characteristics, jurisdiction, entry date and supporting record. Verify the current tariff, governing measures and competent customs authority before filing an entry.