Chapter Notes
Chapter notes are the legally binding provisions that appear at the beginning of each of the 98 chapters of the HTSUS. More specific than section notes, they govern the scope, definitions, and classifications within a single chapter. Under GRI 1, chapter notes are evaluated after section notes but before heading text, and they are controlling over heading language.
In Detail
Chapter notes serve the same range of functions as section notes—exclusion, definition, expansion, and redirection—but apply only within their chapter. Chapter 84 Note 1 excludes a list of textile machinery from Chapter 84's scope (directing those goods to Chapter 84's textile machinery headings instead). Chapter 84 Note 2 defines what constitutes a "machine" for purposes of the chapter. These notes are essential to understanding what each chapter's headings can and cannot classify.
Chapter notes can also create positive, mandatory classifications. Some notes define terms that, when met, require classification within the chapter regardless of competing headings elsewhere in the HTSUS. A chapter note definition of "automatic data processing machines," for example, compels classification of qualifying products in Chapter 84 even if another chapter's heading text fits equally well. The note controls.
The relationship between section notes and chapter notes follows a general-to-specific principle: where both apply to the same product, the more specific chapter note typically controls. But both must always be consulted. A section note exclusion overrides even a chapter note that would otherwise direct the product into the section—the legal hierarchy is section notes first, then chapter notes, then heading text.
Classification Significance
The legally correct classification sequence under GRI 1 is: section notes → chapter notes → heading text. A chapter note that excludes a product from a chapter is dispositive—no heading within that chapter applies. Chapter notes that define terms establish the legal meaning of those terms throughout every heading in the chapter. Missing a chapter note is the most common cause of classification error in complex, multi-chapter product categories, and the error can be invisible on the face of the entry until a CBP audit or protest proceeding.
How Kanon Handles This
Kanon's corpus parser processes all HTSUS chapter notes into structured condition trees. During classification, chapter notes are evaluated in their legally required priority—after section notes, before heading text—and every condition evaluation is documented with a citation to the specific note and provision in the Classification Support Package.