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Canada — Tariff Classification

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Advance ruling procedure for tariff classification

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An advance ruling for tariff classification is a written statement issued by CBSA under paragraph 43.1(1)(c) of the Customs Act that assigns a 10-digit tariff classification number to goods before they are imported and includes a rationale for that classification. The advance ruling is binding on CBSA with respect to the applicant and provides certainty on duty treatment for planned importations. This mechanism is distinct from a national customs ruling (NCR), which is an administrative service for valuation, non-FTA origin, and marking questions under Memorandum D11-11-1.

Who may apply. Any "person" may apply for an advance ruling — including an importer, a foreign exporter or producer, an authorized agent, a licensed customs broker, or a trade consultant acting on behalf of a trade-chain partner. The applicant need not have an office in Canada. Applications may be submitted through the CBSA Assessment and Revenue Management (CARM) Client Portal (launched in phases starting 2023), by email, or by mail to the appropriate CBSA Trade Operations Division office responsible for the region where the applicant's books and records are kept, or — if the applicant has no Canadian office — where the majority of importations are expected to occur.

Application content. Appendix A of Memorandum D11-11-3 sets out the mandatory information: a detailed written description of the goods (composition, materials, processes, function, and end use), samples or photographs if necessary to convey the physical characteristics, technical specifications, schematics, and a statement of the applicant's proposed tariff classification number with supporting analysis under the GIRs. The applicant must also provide a signed consent statement — choosing whether to permit or refuse online publication of the ruling (Appendix B). Failure to provide a consent statement results in the application being declined. If the applicant seeks conditional relief under Chapter 99 of the Customs Tariff in addition to classification under Chapters 1–97, that request may be included in the same application; CBSA will indicate whether the goods "may qualify" for the relief subject to subsequent proof of actual use and compliance with D11-8-5.

CBSA processing and timelines. CBSA's service standard is issuance within 120 calendar days of receiving all necessary information. The clock starts only when the application is complete. If CBSA determines that additional information is needed, it will contact the applicant in the same medium (CARM portal, email, or mail) and allow at least 30 calendar days to provide the supplementary information; the 120-day standard resets once all requested information is received. CBSA may decline to issue a ruling if the application pertains to hypothetical goods (goods that do not yet exist), multiple goods not within a range of similar goods, or if it is impossible to determine the material facts. CBSA may postpone issuance if similar goods are the subject of a pending re-determination, a further re-determination under section 60 of the Customs Act, or a hearing before the Canadian International Trade Tribunal (CITT) or a court, where the outcome is likely to affect the ruling.

Binding effect and scope. An advance ruling is binding on CBSA from its effective date (usually the date of issuance, or a later date specified in the ruling letter) with respect to goods imported by the applicant or — if the applicant is a foreign exporter or producer — by Canadian importers who receive the goods from the ruling recipient and who quote the ruling case number in their import documentation (Form B3-3 or Customs Accounting Document). The ruling binds CBSA only if the material facts and circumstances remain as originally presented and the importer acts in accordance with the terms of the ruling. Although a third-party importer may quote another person's advance ruling case number in a Customs Accounting Document (CAD), CBSA is not bound by that ruling unless the importer is receiving goods from the ruling recipient under the circumstances described in the ruling; importers are therefore encouraged to obtain their own ruling rather than rely on a ruling issued to another party.

Validity, modification, and revocation. An advance ruling remains valid until it is modified or revoked by CBSA or until the material facts or tariff structure change. Section 14 of the Tariff Classification Advance Rulings Regulations (SOR/2005-256) provides that CBSA may modify or revoke a ruling at any time. Notice of modification or revocation must be given in writing, and the effective date is the date of issuance or a later date specified in the notice. Under section 16 of the Regulations, CBSA shall postpone the effective date of a detrimental modification or revocation for up to 90 days if the applicant demonstrates good-faith reliance to the applicant's detriment (for example, the importer has already contracted to purchase a shipment under the original ruling). A modification or revocation applies to goods imported on or after the effective date. However, under subsection 16(2) of the Regulations, a modification or revocation applies retroactively to goods imported before the effective date if (a) it is detrimental to the applicant and the applicant has not acted in accordance with the ruling, or (b) it is to the applicant's benefit. If CBSA discovers that a ruling issued is incorrect due to a CBSA interpretive or administrative error, the original ruling is honored and modifications apply prospectively only; the original ruling is treated as valid from its effective date to the effective date of the modified ruling.

"Reason to believe" obligation. Section 32.2 of the Customs Act, cross-referenced in Memorandum D11-11-3 paragraph 62, provides that an advance ruling addressed to a person is "specific information" that gives that person "reason to believe" that a declaration of tariff classification is incorrect. Under subsection 32.2(1), an importer must correct an incorrect declaration within 90 days after having reason to believe it is incorrect. Failure to correct within 90 days may expose the importer to penalties; late corrections may be made through the Voluntary Disclosures Program under D11-6-4. This means that receipt of an advance ruling that contradicts the importer's prior classification practice triggers an immediate 90-day correction window for past entries.

Review and appeal. Under subsection 60(2) of the Customs Act, an applicant may request a review of an advance ruling by the President of CBSA within 90 days after the ruling is given. The request must be made through the CARM Client Portal or by e-form or mail, with a detailed rationale supporting the applicant's position (Memorandum D11-6-7). The applicant must continue to apply the advance ruling to all importations until a new decision is issued. If the applicant misses the 90-day window, an application for an extension of time may be filed under section 60.1 of the Customs Act (D11-6-9), and if the President refuses that application or does not decide within 90 days, the applicant may apply to CITT to grant the extension. If the applicant disagrees with the President's decision on review, the applicant may appeal to CITT under section 67 of the Customs Act within 90 days of the issuance of the review decision. CITT decisions are further appealable to the Federal Court of Appeal and ultimately to the Supreme Court of Canada on questions of law.

Publication and precedent. With the applicant's consent, CBSA publishes advance rulings in an online repository (established in 2014) accessible via cbsa-asfc.gc.ca to promote uniform and transparent administration of the tariff. Published rulings are persuasive and may be cited by importers of similar goods, but they do not bind CBSA with respect to third parties unless the statutory conditions for binding effect are met.

Source: Customs Act, R.S.C. 1985, c. 1 (2nd Supp.), s. 43.1, s. 60, s. 60.1, s. 32.2 Source: Tariff Classification Advance Rulings Regulations, SOR/2005-256 Source: CBSA Memorandum D11-11-3: Advance Rulings for Tariff Classification

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Appeal to the Canadian International Trade Tribunal (CITT)

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A person aggrieved by a decision of the President of CBSA under section 60 (review of a re-determination or further re-determination) or section 61 (review initiated by the Minister) may appeal to the Canadian International Trade Tribunal (CITT) under subsection 67(1) of the Customs Act. The CITT is an independent quasi-judicial body and a court of record under section 17 of the Canadian International Trade Tribunal Act. Its decisions are binding and may be appealed only to the Federal Court of Appeal on questions of law under section 68 of the Customs Act.

Standing and deadline to file. Subsection 67(1) requires that the notice of appeal be filed "within ninety days after the time notice of the [CBSA President's] decision was given." The 90-day period runs from the date CBSA issues the section 60 or section 61 decision, not from the date the applicant receives the decision. Under Rule 31 of the Canadian International Trade Tribunal Rules, SOR/91-499, the notice of appeal must be filed in writing with both the President of CBSA and the CITT. Filing only with the CITT does not satisfy the statutory requirement. Rule 31 further provides that the notice of appeal must be accompanied by a copy of the CBSA decision being appealed. If the notice of appeal is filed by mail, the date of filing is the earliest postal date appearing on the envelope containing the document; in the absence of proof of mailing, the filing date is the date the Tribunal receives it as evidenced by the date stamp (Rule 31(3)).

Extension of time to appeal. If the 90-day deadline is missed, subsection 67.1(1) of the Customs Act allows the person to apply to CITT for an order extending the time within which to file a notice of appeal. The application and the accompanying notice of appeal must be filed with both the President and the CITT (subsection 67.1(3)). The CITT may grant the extension only if it is satisfied that: (i) within the 90-day period the applicant was unable to act or give a mandate to act, or had a bona fide intention to appeal; (ii) it would be just and equitable to grant the application; (iii) the application was made as soon as circumstances permitted; and (iv) there are reasonable grounds for the appeal (subsection 67.1(2)). The CITT reviews these factors holistically; failure on any one factor will not necessarily defeat an extension application, but an applicant who waits months before applying faces a steep burden on factors (i) and (iii).

Acknowledgement and scheduling. Upon receipt of a notice of appeal, the CITT must "without delay" send an acknowledgement to the appellant and a copy of the notice to CBSA as respondent (Rule 32). The acknowledgement will include the assigned appeal file number, the name of the case officer, and the date by which the appellant's brief is due. Under subsection 67(2) of the Customs Act, the CITT "shall provide for a hearing and shall publish a notice thereof in the Canada Gazette at least twenty-one days prior to the day of the hearing." Any person who, on or before the day of the hearing, enters an appearance with the CITT may be heard on the appeal as an intervener. The CITT typically schedules the hearing several months after the appeal is filed, to allow for the exchange of briefs, disclosure of evidence, and any pre-hearing motions.

Appellant's brief. Rule 34(1) requires the appellant to file a brief with the CITT and serve a copy on CBSA within 60 days after receipt of the CITT's acknowledgement. The brief must be prepared in accordance with Rule 34(2) and (3), which require it to contain:

  • A concise statement of the facts relevant to the appeal;
  • A statement of the points at issue and the appellant's legal position, including the specific tariff classification number the appellant contends is correct;
  • A table of authorities and copies of any authorities (case law, WCO Explanatory Notes, Classification Opinions, CITT decisions, CBP rulings if relevant) that are reasonably necessary to the presentation of the appeal and not readily available;
  • Copies of any documents useful in explaining or supporting the appeal (product samples, technical specifications, purchase orders, prior CBSA rulings on the same or similar goods, expert reports on composition or essential character, HS Explanatory Notes excerpts);
  • The name, address for service, telephone number, and email address of the appellant and counsel (if any).

The appellant must also send the CITT a confirmation that service on CBSA has been effected (Rule 34(1)(b)). Under Rule 34(3), if the appellant intends to rely on documents, authorities, or physical exhibits not available at the time of filing the brief, or on witness testimony, those materials and witness lists must be filed at least 20 days before the hearing and served on the other parties.

Respondent's brief. CBSA, as respondent, must file a response brief within 60 days after service of the appellant's brief (Rule 35(1)). The response must contain (Rule 35(2)):

  • A statement of the grounds of opposition and material facts relevant to each ground;
  • An admission or denial of each ground and material fact set out in the appellant's brief;
  • A table of authorities and copies of authorities reasonably necessary to the presentation of the appeal;
  • Copies of any documents useful in explaining or supporting CBSA's position;
  • The name, address for service, telephone, and email of CBSA counsel (typically an agent from the Department of Justice Civil Litigation Section).

Under Rule 35(3), if CBSA intends to rely on any documents, authorities, or exhibits not previously filed, those must be filed and served at least 10 days before the hearing.

Hearing and evidence. The CITT hears appeals de novo on the record. The Tribunal is not bound by the CBSA's administrative decision but may consider any evidence presented by the parties. Under section 17(2) of the Canadian International Trade Tribunal Act, the CITT "has, as regards the attendance, swearing and examination of witnesses, the production and inspection of documents, the enforcement of its orders and other matters necessary or proper for the due exercise of its jurisdiction, all such powers, rights and privileges as are vested in a superior court of record." Parties may call expert witnesses (for example, chemists to testify on the composition of a product or trade-industry experts to testify on the commercial understanding of a heading). Physical samples of the goods in issue are routinely admitted as exhibits. The CITT applies the General Rules for the Interpretation of the Harmonized System (GIRs) and the Explanatory Notes in the same manner as CBSA does, but the CITT frequently cites its own prior decisions and those of other HS-convention countries' tribunals (for example, the U.S. Court of International Trade and European General Court) for persuasive guidance on the interpretation of identical HS headings.

The hearing is public unless the CITT grants confidentiality on application. Hearings may be conducted in person at the CITT's Ottawa headquarters or by video conference. The Tribunal's practice is informal compared to trial courts: cross-examination is permitted but often limited to central factual disputes, and the panel (typically a single member or three members) may pose questions to witnesses and counsel at any time. Rule 3 provides that the CITT Rules "shall be liberally construed to secure the fairest, least expensive and most expeditious determination of every proceeding."

CITT decision and orders. Under subsection 67(3) of the Customs Act, "the Canadian International Trade Tribunal may make such order, finding or declaration as the nature of the matter may require." The CITT may affirm the CBSA decision, substitute a different tariff classification number, remand to CBSA for further investigation, or dismiss the appeal. The CITT issues written Reasons for Decision, which are published on its website (citt-tcce.gc.ca). Decisions are indexed by appeal number, appellant name, goods description, and tariff heading. The CITT's decisions are binding on CBSA with respect to the appellant and the specific goods that were the subject of the appeal; importers of similar goods may cite a CITT decision as persuasive authority in their own classification disputes, but CBSA is not bound unless the goods are identical and the material facts are the same.

The CITT's decision typically includes an order specifying the correct tariff classification number and directing CBSA to "re-determine the tariff classification in accordance with this decision" or to "re-determine origin" (if the appeal also involves rules-of-origin questions). If the decision results in a lower duty rate, the appellant is entitled to a refund of any overpaid duties and interest under section 69 of the Customs Act, subject to giving security for the unpaid portion of the duty liability if the appellant requested and received a refund pending appeal.

Further appeal to the Federal Court of Appeal. Either the appellant or CBSA may, within 90 days after the date a decision is made under section 67, appeal the CITT's decision to the Federal Court of Appeal "on any question of law" (section 68 of the Customs Act). Appeals to the Federal Court of Appeal are governed by the Federal Courts Act and the Federal Courts Rules. The Federal Court of Appeal reviews CITT decisions on a standard of reasonableness for questions of mixed fact and law (including the application of the GIRs to the goods) and correctness for pure questions of law (such as the interpretation of a statutory provision or the CITT's jurisdiction). With leave, a decision of the Federal Court of Appeal may be further appealed to the Supreme Court of Canada.

Collection of duties pending appeal. Under section 97.34 of the Customs Act, the Minister may not take enforcement action to collect disputed duties until the 91st day after notice of the amount owing is given. Under subsection 97.34(2), if a person has appealed a CBSA decision to the Federal Court under section 97.23 or 135, the Minister must not take collection action before the date of the Court's decision or the day the appeal is discontinued. Under subsection 97.34(5), the Minister must not take collection action if the person has given security to the Minister of Public Safety and Emergency Preparedness when requesting or appealing a CBSA decision. Section 69 of the Customs Act allows an appellant to obtain a refund of duties and interest paid in respect of the goods subject to a section 67 appeal, on giving security satisfactory to the Minister for the unpaid portion plus the whole or any portion of the amount already paid.

Source: Customs Act, R.S.C. 1985, c. 1 (2nd Supp.), ss. 67, 67.1, 68, 69, 97.34 Source: Canadian International Trade Tribunal Act, R.S.C. 1985, c. 47 (4th Supp.), s. 17 Source: Canadian International Trade Tribunal Rules, SOR/91-499, Rules 3, 31, 32, 34, 35 Source: CITT Customs and Excise Appeals Guide

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GRI 3(b) — Essential character test for composite goods, mixtures, and sets

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General Rule for the Interpretation of the Harmonized System 3(b) is the workhorse classification rule for goods that are prima facie classifiable under two or more headings and cannot be resolved by GRI 3(a)'s specific-description test. GRI 3(b) directs that "mixtures, composite goods consisting of different materials or made up of different components, and goods put up in sets for retail sale, which cannot be classified by reference to Rule 3(a), shall be classified as if they consisted of the material or component which gives them their essential character, insofar as this criterion is applicable."

Scope of GRI 3(b). The rule applies to three categories of goods:

  • Mixtures — goods consisting of two or more materials or substances combined (for example, a bag containing barley and oats, or road salt mixed with sand for traction).
  • Composite goods — articles made of different materials or components that form a single whole (for example, a space heater with an integrated decorative LED lamp designed specifically for the heater, where the lamp performs a complementary function and the two components form a practically inseparable whole and would not normally be sold as separate parts).
  • Goods put up in sets for retail sale — goods that (i) consist of at least two different articles classifiable in different headings; (ii) consist of products or articles put up together to meet a particular need or carry out a specific activity; and (iii) are put up in a manner suitable for sale directly to consumers (for example, an electric hair clipper set packaged with scissors, a comb, and a cape; or a travel grooming kit containing a shaving brush, a razor, a hair brush, a toothbrush, a comb, and a leather case).

GRI 3(b) is applied only if GRI 3(a) does not resolve the classification — that is, only if two or more headings each refer to part only of the materials or substances in the good (or part only of the items in a set), and are therefore regarded as equally specific.

The essential-character test. The Federal Court of Appeal stated in 2004 FCA 346 that to be "essential," a characteristic must pertain to the essence of something — in other words, it must be fundamental. The "essential character" is the distinguishing characteristic or attribute that is the central reason for the existence of the good. CBSA Memorandum D10-13-1 (March 20, 2026) summarizes the principle: classification is effected "according to the element which gives the whole its essential character."

Factors for determining essential character. CBSA guidance and the WCO Explanatory Notes specify that the factor that determines essential character will vary from case to case. It may be determined by considering:

  • Nature of the material or component — its role in the article (for example, whether it is the primary functional element or merely supplementary).
  • Bulk, quantity, weight, or volume — particularly in mixtures (for example, in metal ores and concentrates, CBSA Memorandum D10-17-39 directs that essential character is determined by the metal with the highest weight).
  • Value — relative cost or commercial value of the components (for example, in the electric hair clipper set, the clippers account for the majority of the cost and can only be used for cutting hair, while the scissors are multi-purpose; the clippers give the set its essential character and the set is classified under heading 85.10).
  • Functionality or role — which component determines the primary function or purpose of the good (for example, the space heater is the central reason for the existence of the space-heater-with-lamp composite good; the lamp performs a complementary function, so the heater gives the composite good its essential character).
  • Durability or quality — listed in Memorandum D10-14-58 (furniture sets) as characteristics that may be considered.

CBSA emphasizes that the determination of essential character must be made on a case-by-case basis, taking into consideration all of the characteristics of the specific goods.

Application to mixtures. For mixtures such as a bag of barley and oats, essential character may be determined by value if either cereal were greater in value. If not, weight (kilograms) or volume (litres) may be used. In some instances, weight or volume in mixtures may indicate functionality: for example, road salt mixed with some sand to add traction is considered salt (the salt is the functional component); while sand mixed with some salt to soften ice is considered sand (the sand is the functional component).

Application to composite goods. Composite goods are articles made of different materials or components. For a composite good consisting of materials of different headings, the material or component that gives the good its essential character determines classification. For example, replica firearms that are non-operational and essentially decorative are classified on the basis of the material that constitutes their essential character (Memorandum D10-14-52); a replica firearm manufactured from a zinc-aluminum alloy (approximately 95% zinc by weight) would be classified in heading 79.07 as an article of zinc, not as a firearm.

Application to sets put up for retail sale. A set must meet all three conditions listed above. In determining the component that gives a set its essential character, consider the purpose of the set. In the hairdressing set example (electric hair clippers, scissors, comb, cape), the purpose is to cut hair — a specific activity achieving a certain result. The two tools designed for cutting hair are the clippers and the scissors. The scissors, while designed for cutting hair, could also be used to cut other things; the clippers can only be used for cutting hair. The clippers also account for the majority of the cost. By applying GRI 3(b), the set is classified under heading 85.10 (electric hair clippers).

When GRI 3(b) does not apply. The text of GRI 3(b) specifies "insofar as this criterion is applicable." If it is impossible to determine which material or component gives the good its essential character, GRI 3(b) does not resolve the classification and the classifier must proceed to GRI 3(c), which classifies the good under the heading that occurs last in numerical order among those which equally merit consideration.

Explanatory Notes. Section 11 of the Customs Tariff Act requires that "regard shall be had" to the WCO Harmonized System Explanatory Notes when interpreting headings and subheadings. The Explanatory Notes to GRI 3(b) provide detailed guidance on the application of the essential-character test and are routinely cited by the Canadian International Trade Tribunal (CITT) in classification appeals.

Source: Customs Tariff, S.C. 1997, c. 36, s. 10(1) Source: CBSA Memorandum D10-13-1: Tariff Classification of Goods (March 20, 2026) Source: CBSA Guide to Tariff Classification: General Rules for the Interpretation of the Harmonized System Source: CBSA Memorandum D10-14-58: Tariff Classification of Furniture Sets

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Tariff treatments and duty rates — MFN, GPT, LDCT, and FTA preferential tariffs

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Once goods are classified under the correct 10-digit tariff item, the applicable tariff treatment determines the rate of customs duty actually paid. Canada does not apply a single universal duty rate; rather, the List of Tariff Provisions in the schedule to the Customs Tariff, S.C. 1997, c. 36, sets out two columns for each tariff item: the Most-Favoured-Nation Tariff rate (MFN) and the Applicable Preferential Tariffs rates. The applicable tariff treatment depends on the country of origin and whether the importer possesses valid proof of origin at the time of accounting.

Most-Favoured-Nation Tariff (MFN). Under section 27 of the Customs Tariff, "MFN refers to the Most-Favoured-Nation Tariff." The MFN tariff is Canada's baseline rate extended to goods originating in countries that are members of the World Trade Organization (WTO) and that have not entered into a free-trade agreement with Canada. Section 24(1) of the Customs Tariff provides that goods entitled to the MFN Tariff are entitled to that treatment only if (a) proof of origin is given in accordance with the Customs Act; and (b) the goods are entitled to that tariff treatment in accordance with regulations made under section 16 or an order made under the Act. As of 2026, goods originating from all countries except Belarus, North Korea, and Russia are entitled to use the MFN rate. If an importer does not possess proof of origin to support a preferential tariff claim (whether unilateral or free-trade-agreement-based), the MFN rate applies by default—or the General Tariff (a penalty rate higher than MFN) if the country of origin is a non-WTO member or subject to exclusion. The rules of origin for MFN tariff treatment are codified in the Most-Favoured-Nation Tariff Rules of Origin Regulations, SOR/98-33, and detailed in CBSA Memorandum D11-4-3.

Unilateral preferential tariff treatments. Canada grants two unilateral (non-reciprocal) preferential treatments to developing countries and least-developed countries:

  • General Preferential Tariff (GPT): Section 33 of the Customs Tariff provides that goods that originate in a country set out in the List of Countries as a beneficiary of the General Preferential Tariff are entitled to the GPT rates of customs duty, which are generally lower than MFN rates. The List of Countries schedule identifies approximately 175 GPT beneficiaries. The GPT is a unilateral Canadian measure; it does not flow from an FTA. Proof of origin for GPT must be a Form A (Certificate of Origin) or an Exporter's Statement of Origin completed by the exporter in the GPT beneficiary country. Rules of origin are set forth in the General Preferential Tariff and Least Developed Country Tariff Rules of Origin Regulations, SOR/98-34, and explained in CBSA Memorandum D11-4-4. The importer makes a GPT claim by inserting tariff treatment code 09 in Field 14 of Form B3-3 (Canada Customs Coding Form).
  • Least Developed Country Tariff (LDCT): The LDCT provides duty-free entry for goods that originate in 48 countries designated in the List of Countries as LDCT beneficiaries—a subset of GPT beneficiaries. Section 33 of the Customs Tariff extends the GPT rules to the LDCT, subject to enhanced textile and apparel rules. The LDCT rate is almost universally zero percent. The importer claims LDCT by inserting tariff treatment code 08 in Field 14 of Form B3-3. If the goods fail to meet LDCT origin requirements, they may still qualify for GPT or MFN. Failure to furnish the LDCT or GPT proof of origin upon CBSA request results in the application of the MFN rate or another appropriate tariff treatment and the imposition of Administrative Monetary Penalty C152.

Free-trade-agreement preferential tariff treatments. Canada has concluded 15 free-trade agreements in force as of 2026, each with its own tariff abbreviation defined in section 27 of the Customs Tariff and its own rules of origin. The major FTA tariff treatments include:

  • UST (United States Tariff) — Canada–United States–Mexico Agreement (CUSMA / USMCA), in force since July 1, 2020. CUSMA replaced the North American Free Trade Agreement (NAFTA). Under CUSMA, goods that meet the rules of origin in Chapter 4 are eligible for duty-free entry. The certification of origin under CUSMA has no prescribed format and may be completed by the exporter, producer, or importer on an invoice or any other document. For goods with a value for duty not exceeding CAD $3,300, no certification of origin is required to claim preferential tariff treatment, subject to certain conditions (Customs Notice 20-15). The importer must have the certification of origin in their possession at the time of accounting and provide it to CBSA upon request. The tariff treatment code for CUSMA is 01 (UST) in Field 14 of Form B3-3.
  • CEUT (Canada–European Union Tariff) — Comprehensive Economic and Trade Agreement (CETA) with the European Union, provisionally applied since September 21, 2017. CETA eliminates tariffs on most goods traded between Canada and the EU. The importer claims CEUT by inserting the appropriate tariff treatment code in Field 14 of Form B3-3.
  • CPTPT (Comprehensive and Progressive Trans-Pacific Partnership Tariff) — The CPTPP entered into force for Canada on December 30, 2018. The CPTPP comprises 11 Pacific Rim countries (Australia, Brunei, Chile, Japan, Malaysia, Mexico, New Zealand, Peru, Singapore, and Vietnam; the United Kingdom acceded in July 2024). The Customs Tariff provides a separate tariff treatment abbreviation for each CPTPP member (e.g., CPAUT for Australia, CPJPT for Japan, CPNZT for New Zealand). Section 27 of the Customs Tariff defines each abbreviation. Each CPTPP member tariff requires compliance with the CPTPP Chapter 3 rules of origin and proof-of-origin requirements.

Other FTA tariff treatments (defined in section 27) include CCCT (Commonwealth Caribbean Countries Tariff), UKT (United Kingdom Tariff, in force since April 1, 2024), and bilateral FTAs with Chile, Colombia, Costa Rica, Honduras, Israel, Jordan, South Korea, Panama, Peru, and Ukraine.

Most-favorable-tariff rule. Section 25 of the Customs Tariff provides that if goods are entitled to both the MFN Tariff and another tariff, and the MFN rate is lower, the MFN rate applies in lieu of the other tariff. This means that if an importer possesses a valid CUSMA certification of origin but the CUSMA UST rate for a given tariff item is (exceptionally) higher than the MFN rate, the MFN rate will apply. In practice, FTA preferential rates are almost universally zero percent or lower than MFN, so the most-favorable-tariff rule operates as a safeguard.

Proof of origin and the importer's obligation. Section 24(1) of the Customs Tariff conditions all tariff treatments other than the General Tariff on the provision of proof of origin in accordance with the Customs Act. The Proof of Origin of Imported Goods Regulations, SOR/98-52, prescribe the format and timing for furnishing proof of origin. The importer must possess the certificate of origin or other required proof at the time of accounting (when Form B3-3 is filed). Under subsection 35.1(1) of the Customs Act, when an importer makes or assents to make a declaration on Form B3-3 that a preferential tariff treatment is claimed, the importer must have the relevant proof of origin in their possession. If the importer does not have the certificate of origin in their possession at the time of accounting, another appropriate tariff—usually the MFN Tariff—must be claimed (CBSA Memorandum D11-4-2). Failure to furnish proof of origin upon CBSA request may expose the importer to Administrative Monetary Penalty C152 and re-determination at the MFN rate.

Tariff-treatment codes. When accounting for goods on Form B3-3, the importer selects the tariff treatment code in Field 14. The codes are published in CBSA Memorandum D17-1-10, Coding of Customs Accounting Documents. Examples: 01 (UST / CUSMA), 02 (MFN), 08 (LDCT), 09 (GPT), and three-character codes for other FTAs (e.g., CEUT, UKT, CPJPT). Selection of the wrong tariff treatment code or failure to possess supporting proof of origin at the time of accounting constitutes a customs accounting error subject to correction under section 32.2 of the Customs Act (the importer must correct an incorrect declaration within 90 days of having reason to believe it is incorrect) and, in cases of negligence or false statement, potential penalties under the Administrative Monetary Penalty System.

Refund of overpaid duties. Where a preferential tariff treatment is not claimed at the time of importation due to error, involuntary omission, or proof of origin not being available at the time of importation, an application for a refund may be submitted under paragraph 74(1)(e) of the Customs Act on Form B2 (Canada Customs – Adjustment Request) within four years from the date of accounting. CBSA extended the refund period from one year to four years when CUSMA came into force on July 1, 2020, to provide importers with additional time to claim CUSMA preferential tariff treatment for goods that had been accounted for at MFN rates.

Source: Customs Tariff, S.C. 1997, c. 36, ss. 20, 24, 25, 27, 33 Source: Most-Favoured-Nation Tariff Rules of Origin Regulations, SOR/98-33 Source: General Preferential Tariff and Least Developed Country Tariff Rules of Origin Regulations, SOR/98-34 Source: Proof of Origin of Imported Goods Regulations, SOR/98-52 Source: CBSA Memorandum D11-4-2: Proof of Origin of Imported Goods Source: CBSA Memorandum D11-4-3: Rules of Origin Respecting the Most-Favoured-Nation Tariff Source: CBSA Memorandum D11-4-4: Rules of Origin Respecting the General Preferential Tariff and Least Developed Country Tariff Source: CBSA: Overview of key changes affecting imports under CUSMA Source: CBSA: Guide to importing commercial goods into Canada — Step 3. Determining duties and taxes

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GRI 6 — Classification at the subheading and tariff-item levels

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General Rule for the Interpretation of the Harmonized System 6 (GRI 6) governs classification at the subheading and tariff-item levels, once the correct heading has been determined under GIRs 1–5. GRI 6 is the procedural rule that extends the entire GIR framework down through the hierarchical structure of the Canadian Customs Tariff — from the four-digit heading to the six-digit subheading and then to the eight-digit tariff item (the level at which duty rates are assigned) and finally to the ten-digit statistical suffix.

Statutory text. GRI 6 is codified in the schedule to the Customs Tariff, S.C. 1997, c. 36, and provides:

> For legal purposes, the classification of goods in the subheadings of a heading shall be determined according to the terms of those subheadings and any related Subheading Notes and, mutatis mutandis, to the above Rules, on the understanding that only subheadings at the same level are comparable. For the purpose of this Rule the relative Section and Chapter Notes also apply, unless the context otherwise requires.

Application of GIRs 1–5 at the subheading level. The phrase "mutatis mutandis" means "with the necessary changes having been made." CBSA Memorandum D10-13-1 (March 20, 2026) explains that GRI 6 "specifies that the preceding process be repeated to classify goods at the subheading level." In other words, once the importer or customs broker has applied GIRs 1–5 to arrive at the correct four-digit heading, the classifier must apply GIRs 1–5 again — this time comparing only the subheading texts and any Subheading Notes within that heading — to select the correct six-digit subheading. The same sequential process applies: GRI 1 first (classification by the terms of the subheading and the Subheading Notes), then GIR 2(a) and 2(b) if relevant (incomplete or unfinished goods, mixtures, goods of combined materials), then GIR 3 if two or more subheadings are equally specific, then GIR 4 if no subheading applies, and GIR 5 for packing.

"Only subheadings at the same level are comparable." The Canadian Customs Tariff uses a dash structure to denote hierarchical levels within a heading. Subheadings have two levels: one-dash subheadings (fifth digit 1–9, sixth digit 0, e.g., 0803.10) and two-dash subheadings (fifth and sixth digits both 1–9, e.g., 0803.19). CBSA guidance emphasizes that the classifier must compare only subheadings at the same dash level. First, determine which one-dash subheading applies by comparing the text of all one-dash subheadings under the same heading. Only after the correct one-dash subheading is chosen may the classifier proceed to compare the two-dash subheadings beneath it. Attempting to compare a one-dash subheading directly with a two-dash subheading violates the hierarchical structure of the tariff and the "only subheadings at the same level are comparable" principle.

Section and Chapter Notes apply "unless the context otherwise requires." The final sentence of GRI 6 specifies that Section and Chapter Notes — which are part of the legal foundation of the tariff under subsection 10(1) of the Customs Tariff Act — continue to apply when classifying at the subheading level, unless the context of the subheading or a Subheading Note indicates otherwise. For example, Chapter 71, Note 4(B) directs that iridium, osmium, palladium, rhodium, and ruthenium shall be classified as platinum for the purposes of the Chapter. However, Subheading Note 2 to Chapter 71 expressly provides that for the purposes of subheadings 7110.11 and 7110.19, the term "platinum" does not include those metals. This is a "context otherwise requires" exception: the Chapter Note applies at the heading level, but the Subheading Note narrows the definition for classification within those specific subheadings.

Canadian Rules and classification at the tariff-item level. Canada's Customs Tariff adds two digits beyond the international six-digit HS subheading: digits 7 and 8 form the tariff item, the eight-digit code to which duty rates are assigned. Subsection 10(1) of the Customs Tariff Act provides that classification shall be determined "in accordance with the General Rules for the Interpretation of the Harmonized System and the Canadian Rules set out in the schedule." Canadian Rule 1, appended to the GIRs in the schedule, mirrors GRI 6 and provides:

> For legal purposes, the classification of goods in the tariff items of a subheading or of a heading shall be determined according to the terms of those tariff items and any related Supplementary Notes and, mutatis mutandis, to the above Rules [i.e., GIRs 1–6], on the understanding that only tariff items at the same level are comparable. For the purpose of this Rule the relative Section and Chapter Notes also apply, unless the context otherwise requires.

Tariff items have two dash levels: three-dash (digit 7 is 1–9, digit 8 is 0) and four-dash (digits 7 and 8 are both 1–9). The same hierarchical comparison rule applies: compare three-dash tariff items first, then four-dash tariff items under the selected three-dash item. Supplementary Notes, which appear at the head of certain Chapters, apply only at the tariff-item level and define goods or conditions for classification under specific tariff items, including conditional-relief items in Chapter 99.

Statistical suffixes. The final two digits (9 and 10) are statistical suffixes maintained by Statistics Canada for trade-data collection. They do not affect the rate of duty. If no statistical breakdown exists for a given tariff item, digits 9 and 10 are both zeros.

Practical application and common errors. CBSA Memorandum D10-13-1 emphasizes that the classification process "reflects the hierarchical structure of the Tariff. Headings are only to be compared with other headings. No consideration is to be given to the descriptions found in the subheadings, tariff items or statistical subdivision, when determining which heading is applicable." The same principle applies at each level: when choosing among subheadings, compare only subheadings; when choosing among tariff items, compare only tariff items at the same dash level. A common error is "reading down" the tariff — starting at the subheading or tariff-item level and working backward to the heading. This approach violates GRI 6 and can lead to incorrect classification, because a subheading or tariff item may describe goods in language that is narrower than the heading, and the classifier may overlook an exclusion in a Section or Chapter Note that applies at the heading level.

GRI 6 in CBSA advance rulings and CITT appeals. CBSA advance rulings routinely cite GRI 1 and GRI 6 together when goods are classified without ambiguity. For example, in ruling 2014-007906 (motorcycle topcase), CBSA stated: "General Interpretative Rule 1 (GIR 1) directs that titles of Sections, Chapters and sub-Chapters are provided for ease of reference only. For legal purposes, classification shall be determined according to the terms of the heading and any relative Section and Chapter Notes. Similarly, General Interpretative Rule 6 (GIR 6) directs that classification shall be determined according to the terms of those subheadings and any related Subheading Notes. Accordingly, the product is classified under 8714.10.00.00 … in accordance with GRI 1 and 6." The citation of both rules reflects the two-step process: GRI 1 to establish the heading (87.14, parts and accessories of motorcycles), then GRI 6 to confirm the subheading (8714.10, parts and accessories of motorcycles of heading 87.11).

Source: Customs Tariff, S.C. 1997, c. 36, s. 10(1) and Schedule (GRI 6, Canadian Rule 1) Source: CBSA Memorandum D10-13-1: Tariff Classification of Goods (March 20, 2026) Source: CBSA Guide to Tariff Classification: General Rules for the Interpretation of the Harmonized System

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Section and Chapter Notes — binding legal status and interpretive priority

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Section and Chapter Notes are part of the legislation of the Customs Tariff and are binding on CBSA, importers, and the Canadian International Trade Tribunal (CITT). They define the scope of Sections, Chapters, headings, and subheadings; exclude goods from classification; define technical terms; and in some instances override the ordinary meaning of heading text. A classifier must read and apply all relevant Section and Chapter Notes before selecting a heading.

Statutory foundation. Subsection 10(1) of the Customs Tariff, S.C. 1997, c. 36, provides that classification "shall be determined according to the General Rules for the Interpretation of the Harmonized System [GIRs], the Supplementary Notes and the Canadian Rules set out in the schedule." The GIRs are printed immediately before the List of Tariff Provisions in the schedule to the Act. General Rule 1 provides: "For legal purposes, classification shall be determined according to the terms of the headings and any relative Section or Chapter Notes and, provided such headings or Notes do not otherwise require, according to the following provisions [GIRs 2–6]." GIR 6 specifies that "the relative Section and Chapter Notes also apply" when classifying goods at the subheading level. The clear language "according to... any relative Section or Chapter Notes" means that these Notes have the same binding legal status as the headings themselves. CBSA Memorandum D10-13-1 (March 20, 2026) confirms: "Section and Chapter Notes... are part of the legislation and must be considered."

Location and format. Section and Chapter Notes are printed at the beginning of the Section or Chapter, before the first heading. Not all Sections and Chapters have Notes. For Sections that do, Section Notes precede Chapter Notes; both apply to goods classified in the Chapters of that Section. Section Notes typically begin with the heading "Notes." and are numbered sequentially (1., 2., 3., etc.). Section Notes apply to all Chapters within the Section unless a Note specifies a narrower scope. Chapter Notes apply only within the specific Chapter. Supplementary Notes (also binding under subsection 10(1)) appear in some Chapters and define goods or conditions for classification under specific tariff items; they are published at the head of the Chapter or heading and apply only at the tariff-item level (digits 7–8).

Functions of Section and Chapter Notes. CBSA Memorandum D10-13-1 paragraph 24 summarizes: "Typically, these Notes will list certain inclusions and exclusions for the Chapter or Section. In some cases, they define certain terms or specify how a certain commodity is to be classified. When applicable, they may indicate how parts of goods are to be classified." The CBSA's online tariff-classification guide further states: "They define the scope and limits of sections, chapters, headings and subheadings by providing: general definitions establishing the scope of a heading or subheading; lists of typical examples of goods a heading or subheading may cover (the lists are non-exhaustive so they don't show every single good that belongs on the list); lists of goods that one heading excludes and another includes."

Examples of binding Notes.

  • Definitions. Note 2 to Section XV defines the term "parts of general use" to mean articles of specified headings (e.g., 73.07, 73.12, 73.15, 73.17, 73.18, and similar articles of other base metal; springs and leaves for springs of base metal; articles of headings 83.01, 83.02, 83.08, 83.10, and frames and mirrors of base metal of heading 83.06). This definition is binding throughout the tariff: any reference to "parts of general use" in any Section or Chapter Note must be interpreted to mean the articles enumerated in Note 2 to Section XV, regardless of whether a particular article is committed by design for use in a single machine. CBSA Memorandum D10-0-1 paragraph 16 gives the example of an iron or steel bolt committed by design to function as a fastening device in a particular mining machine: the bolt is classified in heading 73.18 (and not as a machine part) because heading 73.18 falls within the scope of "parts of general use."
  • Exclusions from a Chapter or Section. Note 1 to Section XVI lists goods excluded from Chapters 84 and 85, including transmission or conveyor belts or belting of textile material (heading 59.10); articles of leather or composition leather of a kind used in machinery (heading 42.05); and parts of general use, as defined in Note 2 to Section XV, of base metal (Section XV) or similar goods of plastics (Chapter 39). These exclusions override the general scope of the Section: even if a good is "used in machinery," if it is listed in Note 1 to Section XVI it is classified in the heading specified in the exclusion, not in Section XVI. CBSA Memorandum D10-0-1 paragraph 19 confirms that Note 1(g) to Section XVI excludes parts of general use of base metal or plastics; "in this instance, even if the article may be committed by design and for use solely or principally for a machine included in Section XVI, if it is identified as a 'part of general use', the article is excluded from classification in Section XVI."
  • Overriding heading text. Note 2(a) to Section XVI provides that parts which are goods included in any of the headings of Chapter 84 or 85 (other than specified exceptions such as headings 84.09, 84.31, 84.48, 84.66, 84.73, 84.87, 85.03, 85.22, 85.29, 85.38, and 85.48) "are in all cases to be classified in their respective headings." This means that a component part having its own heading in Chapter 84 or 85 (for example, a filter under heading 84.21, or a valve under heading 84.81) is classified under that component heading, even if the part is designed for use solely or principally with a particular machine elsewhere in Section XVI and even if the importer intended to classify it as a part of the machine. CBSA Memorandum D10-14-43 paragraph 9 confirms that "filters are specified in the heading text of heading 84.21. In accordance with General Interpretative Rule 1, and Legal Note 2(a) to Section XVI, all filters are classified within heading 84.21, and in no other heading of the Tariff. Filters are not classified as parts or accessories to the goods with which they are intended to be used."
  • Specifying classification method. Note 3 to Section XVI provides: "Unless the context otherwise requires, composite machines consisting of two or more machines fitted together to form a whole and other machines designed for the purpose of performing two or more complementary or alternative functions are to be classified as if consisting only of that component or as being that machine which performs the principal function." This Note directs the classifier to identify the principal function of a composite machine. For example, a diaphragm pump equipped with valves and an electric motor is classified in heading 84.13 ("Pumps for liquids") because the pump is the principal function; the valves and motor are incidental components. This Note has priority over any general principle of essential character under GIR 3(b), because GIR 1 specifies that classification is determined "according to... Section or Chapter Notes... provided such headings or Notes do not otherwise require, according to the following provisions [GIRs 2–6]."

Contrast with Explanatory Notes. Section 11 of the Customs Tariff provides that in interpreting headings and subheadings, "regard shall be had" to the Harmonized System Explanatory Notes (ENs) and the Compendium of Classification Opinions published by the World Customs Organization. The ENs and the Compendium are not legally binding, but CBSA and the CITT are required to consider them and routinely cite them as highly persuasive authority. The CBSA's online guide confirms: "ENs are not legally binding, but you must consider them when classifying goods as they help to clarify the goods that are covered under a heading or subheading." Section and Chapter Notes, by contrast, are binding and take priority over the ENs. If a Section or Chapter Note conflicts with an Explanatory Note, the Section or Chapter Note prevails. An academic analysis published by the University of Alberta Faculty of Law states: "Should there be a conflict, the Section Note is statutory, and legally binding. It has priority over the D-Memorandum, and also over any general test derived from the case law."

Practical classification sequence. CBSA Memorandum D10-13-1 paragraph 46 provides that "the tariff classification process begins by applying GIR 1 and determining which heading provides for the product when taking into account the terms of headings and relative Chapter and Section Notes." A classifier must therefore:

  1. Identify the Section or Chapter in which the goods are prima facie classifiable;
  2. Read all Section Notes applicable to that Section and all Chapter Notes applicable to the Chapter;
  3. Apply any exclusions in Note 1 to the Section or Chapter (if the goods are excluded, classify them in the heading or Chapter specified in the exclusion and stop);
  4. Apply any definitions in the Notes (for example, if the goods are "parts of general use" as defined in Note 2 to Section XV, classify them in the heading specified in that definition);
  5. Read the heading text, applying any interpretive rules or conditions specified in the Section or Chapter Notes; and
  6. Proceed to the subheading and tariff-item levels, continuing to apply the Section and Chapter Notes (under GIR 6 and Canadian Rule 1, the Section and Chapter Notes also apply at these levels unless the context otherwise requires).

Failure to apply a binding Section or Chapter Note is a classification error that may expose the importer to a re-determination and administrative monetary penalty under the Customs Act.

Source: Customs Tariff, S.C. 1997, c. 36, s. 10(1), s. 11 Source: CBSA Memorandum D10-13-1: Tariff Classification of Goods (March 20, 2026) Source: CBSA Guide to Tariff Classification: Legal Notes of the Harmonized System Source: CBSA Memorandum D10-0-1: Classification of Parts and Accessories in the Customs Tariff Source: CBSA Memorandum D10-14-43: Tariff Classification of Filters, Parts Thereof and Filter Media Source: Customs Tariff 2026: General Rules for the Interpretation of the Harmonized System

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Section and Chapter Notes — binding interpretive texts

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Section and Chapter Notes are the binding legal texts published at the beginning of each Section or Chapter of the Customs Tariff that define the scope of headings, specify inclusions and exclusions, and establish special definitions for terms used within that Section or Chapter. Under subsection 10(1) of the Customs Tariff, S.C. 1997, c. 36, classification is determined "in accordance with the General Rules for the Interpretation of the Harmonized System" — and GIR 1 itself directs that "for legal purposes, classification shall be determined according to the terms of the headings and any relative Section or Chapter Notes." The Notes are part of the legislation and must be observed in every classification decision.

Legal status and priority in the classification sequence. Section and Chapter Notes have the same legal force as the heading and subheading texts. CBSA Memorandum D10-13-1 (March 20, 2026) states plainly: "These notes are part of the legislation and, therefore, must be observed." GIR 1 instructs the classifier to determine classification "according to the terms of the headings and any relative Section or Chapter Notes." In practice, the classifier must read the relevant Section and Chapter Notes before comparing headings, because a Note may exclude goods from a heading whose text would otherwise describe them, or may expand a heading to include goods that would not be covered by the heading text alone. For example, Chapter 71, Note 4(A) provides that "For the purposes of this Chapter, the expression 'platinum' means platinum, iridium, osmium, palladium, rhodium and ruthenium" — a definition that overrides the ordinary commercial understanding of the word "platinum" when classifying goods in Chapter 71. An importer who classifies an article containing rhodium without consulting Note 4(A) may incorrectly classify the article as base metal, when in fact rhodium is "platinum" for Chapter 71 purposes.

Location and organization. Section and Chapter Notes are located at the beginning of each Section or Chapter in the Customs Tariff. Most — but not all — Sections and Chapters have Notes. The Customs Tariff comprises 21 Sections and 99 Chapters (with Chapter 77 reserved for future use and Chapters 98 and 99 reserved for Canada-specific conditional relief). Section Notes appear at the head of the Section and apply to all Chapters within that Section; Chapter Notes appear at the head of the individual Chapter and apply only to that Chapter. A Section Note that applies to the same subject matter as a Chapter Note will typically specify the relationship — for example, Section XVI, Note 2(a) provides that "Parts which are goods included in any of the headings of Chapter 84 or 85 (other than headings 84.09, 84.83, 84.85, 85.03, 85.22, 85.29, 85.38 and 85.48) are in all cases to be classified in their respective headings."

Types of provisions in the Notes. CBSA Memorandum D10-13-1 summarizes the typical content: "Typically, these notes will list certain inclusions and exclusions for the Chapter or Section. In some cases, the notes define certain terms or they may specify how a certain commodity is to be classified." Examples of each category follow.

Inclusions. Some Notes affirmatively include goods that might not be covered by the heading text alone. For example, Chapter 39, Note 6(a) provides that in headings 39.01 to 39.11, "the expression 'primary forms' applies only to the following forms: (a) Liquids and pastes, including dispersions (emulsions and suspensions) and solutions …" This definition ensures that a liquid polyethylene dispersion is classified as a "primary form" in heading 39.01, even though the heading text does not explicitly use the word "liquid."

Exclusions. Many Notes specify that goods meeting a certain description are excluded from the Chapter or Section. For example, Section XI (Textiles and Textile Articles), Note 1(h) excludes "Articles of Chapter 95 (for example, toys, games, sports requisites and nets)" from the entire Section. This means that a fabric toy animal, even though it is made of textile materials, is classified in Chapter 95 as a toy, not in Section XI as a textile article. The Note creates a specific-over-general rule: toys prevail over textiles when both headings could apply.

Definitions. Some Notes define technical or commercial terms as used within a specific Chapter or Section. Chapter 84, Note 5(A) defines "automatic data processing machines" as machines capable of "(i) Storing the processing program or programs and at least the data immediately necessary for the execution of the program; (ii) Being freely programmed in accordance with the requirements of the user; (iii) Performing arithmetical computations specified by the user; and (iv) Executing, without human intervention, a processing program which requires them to modify their execution, by logical decision during the processing run." A machine that lacks any one of these four attributes is not an "automatic data processing machine" for heading 84.71, even if it performs some data-processing functions. The Note creates an exhaustive test, and the classifier must verify all four prongs.

Classification instructions. Some Notes direct how goods presenting a classification difficulty are to be classified. Section XVI, Note 2(a) (referenced above) is a classification instruction: it states that parts that are themselves goods of headings 84.01 to 85.48 are "in all cases" to be classified in their respective headings, rather than as parts in a parts-specific heading. Chapter 50, Note 2(B) provides that "For the purposes of headings 50.04 and 50.05: (a) The expression 'silk yarn' means yarn spun wholly from silk …" These instructions establish bright-line rules that the classifier must follow, even if GIR 3(b) or GIR 3(c) might otherwise suggest a different result.

Section, Chapter, and Subheading Notes. The Customs Tariff distinguishes three levels of legal notes: Section Notes, Chapter Notes, and Subheading Notes. Subheading Notes appear after the Chapter Notes and apply only at the six-digit subheading level (not at the four-digit heading level). GRI 6 provides that classification at the subheading level is determined "according to the terms of those subheadings and any related Subheading Notes" and specifies "For the purpose of this Rule the relative Section and Chapter Notes also apply, unless the context otherwise requires." This means that Section and Chapter Notes continue to apply at the subheading level, but if a Subheading Note expressly modifies or narrows a definition, the Subheading Note controls for subheading classification. For example, Chapter 71, Note 4(B) states that for the purposes of Chapter 71, "platinum" includes iridium, osmium, palladium, rhodium, and ruthenium; but Subheading Note 2 provides that "For the purposes of subheadings 7110.11 and 7110.19, the expression 'platinum' does not include iridium, osmium, palladium, rhodium or ruthenium." An article of rhodium is classified in heading 71.10 (platinum) by virtue of Chapter Note 4(B), but within heading 71.10 it is classified in subheading 7110.19 ("Other") because rhodium is excluded from the definition of "platinum" in subheading 7110.11 by Subheading Note 2.

Supplementary Notes. In addition to Section, Chapter, and Subheading Notes, Canada has enacted Supplementary Notes that apply only at the eight-digit tariff-item level. These Notes are published at the head of certain Chapters and define goods or conditions for classification under specific conditional-relief tariff items in Chapter 98 or Chapter 99 or under specific national tariff items in Chapters 1 to 97. CBSA's Guide to Tariff Classification states: "In Canada we also have supplementary notes. These notes are applied at the tariff item level only." Canadian Rule 1 (the national analogue to GRI 6) provides that tariff-item classification is determined "according to the terms of those tariff items and any related Supplementary Notes." Supplementary Notes do not form part of the international Harmonized System and are unique to Canada.

Interaction with the Explanatory Notes. Section 11 of the Customs Tariff Act provides that "regard shall be had" to the Harmonized System Explanatory Notes when interpreting headings and subheadings. The Explanatory Notes are not legally binding — they are interpretive guidance published by the World Customs Organization. In contrast, Section and Chapter Notes are legally binding. CBSA Memorandum D10-13-1 distinguishes the two: "The legal core of the Tariff consists of the General Rules for the Interpretation of the Harmonized System, the Section and Chapter notes, and the heading, subheading and tariff item texts. The HS Explanatory Notes complement the legal core. They explain the application and scope of the Section and Chapter Notes." When a Section or Chapter Note conflicts with an Explanatory Note, the legally binding Section or Chapter Note prevails.

Practical application: reading the tariff. When classifying goods, the practitioner should follow this sequence: (1) identify the candidate Section(s) by reviewing the Section titles and Section Notes; (2) within the candidate Section(s), identify the candidate Chapter(s) and read the Chapter Notes to confirm that the goods are not excluded from that Chapter and to identify any special definitions; (3) compare the heading texts, applying GIRs 1 through 5 as necessary, while keeping in mind any inclusions, exclusions, or definitions established in the Section and Chapter Notes; (4) once the correct heading is determined, read any Subheading Notes and apply GIR 6 to select the correct subheading; (5) read any Supplementary Notes and apply Canadian Rule 1 to select the correct tariff item. Skipping step (2) — the reading of the Section and Chapter Notes — is the most common source of classification error, because the heading text alone may appear to describe the goods when in fact a Note excludes them or assigns them to a different heading.

CBSA advance rulings and CITT appeals routinely cite Section and Chapter Notes. In classification appeals before the Canadian International Trade Tribunal, Section and Chapter Notes are cited as frequently as the heading texts themselves. For example, CITT decisions on the classification of composite goods often turn on the application of Section XVI, Note 3, which provides that "Unless the context otherwise requires, composite machines consisting of two or more machines fitted together to form a whole … are to be classified as if consisting only of that component … which performs the principal function." The Note establishes a functional test that may override the essential-character test of GRI 3(b). A practitioner who does not read Section XVI, Note 3 may apply GRI 3(b) and reach an incorrect classification, even though the GRI 3(b) analysis is internally consistent.

Source: Customs Tariff, S.C. 1997, c. 36, s. 10(1) and Schedule (GIR 1, Section and Chapter Notes) Source: CBSA Memorandum D10-13-1: Tariff Classification of Goods (March 20, 2026) Source: CBSA Guide to Tariff Classification: Legal Notes of the Harmonized System

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