Textbook chapter 1
Classify the article before using a parts provision
Answer first
Begin with any specific provision for the imported article, then apply exclusions and applicable parts Notes, including parts-of-general-use rules. Sole or principal use matters only after those legal gates remain open. Answer first: check applicable Section and Chapter Notes, exclusions, and any specific provision for the article itself before using a parts provision. Absent special language or context, Additional U.S. Rule 1(c) covers products solely or principally used as a part, but a provision for parts or parts and accessories does not prevail over a specific provision for that part or accessory. Use the October 2026 exam's 2026 HTS Basic text; later current-law revisions require a separate live-law check.
Rule breakdown
Controlling rule and limits
HTSUS Additional U.S. Rule of Interpretation 1(c); Applicable HTSUS Section and Chapter Notes, including Section XVI Note 2 when relevant ↗Answer first: check applicable Section and Chapter Notes, exclusions, and any specific provision for the article itself before using a parts provision. Absent special language or context, Additional U.S. Rule 1(c) covers products solely or principally used as a part, but a provision for parts or parts and accessories does not prevail over a specific provision for that part or accessory. Use the October 2026 exam's 2026 HTS Basic text; later current-law revisions require a separate live-law check. The learning objective is to determine whether a specific provision, a legal note, or a parts provision controls the imported article.; exceptions and triggering facts must be identified before calculation or conclusion.
Authority navigation and proof
HTSUS Additional U.S. Rule of Interpretation 1(c); Applicable HTSUS Section and Chapter Notes, including Section XVI Note 2 when relevant ↗Begin with any specific provision for the imported article, then apply exclusions and applicable parts Notes, including parts-of-general-use rules. Sole or principal use matters only after those legal gates remain open. Navigate the controlling material through 2026 HTS Basic → Additional U.S. Rules of Interpretation → Rule 1(c); Open the relevant Section and Chapter Notes before the candidate parts provision. Record the decisive text and fact rather than relying on memory or a search snippet.
Decision path
- 1
Set the legal gate for Classify the article before using a parts provision
Determine whether a specific provision, a legal note, or a parts provision controls the imported article. Separate the controlling trigger from descriptive labels, then list the facts that could activate an exception or a different legal path.
- 2
Prove the rule in HTSUS Additional U.S. Rule of Interpretation 1(c)
For one machine component, find any specific heading for the component, read the applicable parts note, and only then inspect the machine's parts provision. Use this route: Use the 2026 HTS Basic Edition in the order: legal notes → specific provision → parts provision → Additional U.S. Rule 1(c).. Preserve the exact subsection, field instruction, note, or rate line that supports the answer.
- 3
Test the boundary of Classify the article before using a parts provision
Begin with any specific provision for the imported article, then apply exclusions and applicable parts Notes, including parts-of-general-use rules. Sole or principal use matters only after those legal gates remain open. Apply that boundary to the stated facts, identify the fact that would reverse the result, and only then adopt the worked-example conclusion: On the stated assumptions, classify under the specific electric-motor provision rather than automatically as a washing-machine part.
Worked example
Scenario: A replacement electric motor is imported solely for a washing machine, but the HTSUS contains a specific provision for electric motors. Assume Section XVI Note 2(a) applies.
- 1.Identify the imported article itself as an electric motor.
- 2.Read Section XVI Note 2 before relying on the washing-machine parts provision.
- 3.Locate the specific electric-motor provision and compare it with the generic parts language.
- 4.Apply the rule that a parts provision does not prevail over a specific provision.
- 5.Boundary check: change one decisive fact identified by this research task—For one machine component, find any specific heading for the component, read the applicable parts note, and only then inspect the machine's parts provision.—and explain whether the conclusion would change under HTSUS Additional U.S. Rule of Interpretation 1(c); Applicable HTSUS Section and Chapter Notes, including Section XVI Note 2 when relevant.
Conclusion: On the stated assumptions, classify under the specific electric-motor provision rather than automatically as a washing-machine part.
Common traps and corrections
× Assuming dedicated use automatically produces a parts classification.
✓ This shortcut fails because “Assuming dedicated use automatically produces a parts classification.” skips a controlling distinction. Begin with any specific provision for the imported article, then apply exclusions and applicable parts Notes, including parts-of-general-use rules. Sole or principal use matters only after those legal gates remain open. Re-run the source route in Use the 2026 HTS Basic Edition in the order: legal notes → specific provision → parts provision → Additional U.S. Rule 1(c). and state the decisive fact before selecting the result.
× Ignoring a Section or Chapter Note that directs or excludes parts.
✓ This shortcut fails because “Ignoring a Section or Chapter Note that directs or excludes parts.” skips a controlling distinction. Begin with any specific provision for the imported article, then apply exclusions and applicable parts Notes, including parts-of-general-use rules. Sole or principal use matters only after those legal gates remain open. Re-run the source route in Use the 2026 HTS Basic Edition in the order: legal notes → specific provision → parts provision → Additional U.S. Rule 1(c). and state the decisive fact before selecting the result.
× Applying Classify the article before using a parts provision without proving both the decisive fact and the controlling source edition.
✓ Begin with any specific provision for the imported article, then apply exclusions and applicable parts Notes, including parts-of-general-use rules. Sole or principal use matters only after those legal gates remain open. Navigate the controlling material through 2026 HTS Basic → Additional U.S. Rules of Interpretation → Rule 1(c); Open the relevant Section and Chapter Notes before the candidate parts provision. Record the decisive text and fact rather than relying on memory or a search snippet. For the October 2026 CBLE, use the designated edition; for live work, separately date and verify the current source rather than blending the two lanes.
Frequently asked questions
Which fact controls first when applying Classify the article before using a parts provision?
Begin with any specific provision for the imported article, then apply exclusions and applicable parts Notes, including parts-of-general-use rules. Sole or principal use matters only after those legal gates remain open. Start with HTSUS Additional U.S. Rule of Interpretation 1(c), identify the trigger and any exception, and use the decision path before calculating or choosing a familiar label.
Where should I verify Classify the article before using a parts provision for the exam and for live work?
Use the cited exam-edition source cards for the October 2026 CBLE and preserve their pinpoint text. For a live transaction, separately re-check the current statute, eCFR, HTS, or CBP operational source listed for this chapter; a newer source does not silently rewrite the exam edition.
Official sources and editions
- 2026 HTSUS Basic Edition: Harmonized Tariff Schedule of the United States, 2026 Basic Edition ↗
Exam-designated 2026 HTS Basic Edition; later live revisions do not replace it for the October 2026 CBLE.
Last reviewed: 2026-08-19
- Current HTSUS: USITC Current Harmonized Tariff Schedule ↗
Current-law research source reviewed separately from the exam-designated 2026 Basic Edition.
Last reviewed: 2026-08-19
- HTSUS Additional U.S. Rule of Interpretation 1(c): 2026 HTS Basic → Additional U.S. Rules of Interpretation → Rule 1(c) ↗
October 28, 2026 CBLE: 2026 HTS Basic Edition. Later current-law revisions must not replace the exam-designated Basic Edition. Reviewed for this textbook chapter on 2026-08-19.
Last reviewed: 2026-08-19
- Applicable HTSUS Section and Chapter Notes, including Section XVI Note 2 when relevant: Open the relevant Section and Chapter Notes before the candidate parts provision ↗
October 28, 2026 CBLE: 2026 HTS Basic Edition. Later current-law revisions must not replace the exam-designated Basic Edition. Reviewed for this textbook chapter on 2026-08-19.
Last reviewed: 2026-08-19