Heading (HTSUS)
A heading is a 4-digit provision in the HTSUS that defines the primary product category. The heading level is where GRI 1 classification begins — before any subheading comparison is made. The heading text, together with applicable section and chapter notes, constitutes the legal description of the goods that can be classified there.
In Detail
The HTSUS contains approximately 1,200 headings organized across 97 chapters and 22 sections. Each heading consists of a 4-digit number followed by a legal description — for example, heading 8481 covers “Taps, cocks, valves and similar appliances, for pipes, boilers, tanks, vats or the like, including pressure-reducing valves and thermostatically controlled valves.” The heading description establishes the outer boundary of what can be classified there.
Classification at the heading level is governed by GRI 1, which requires that classification be determined by the terms of the headings and any relative section or chapter notes. This means the heading text is never read in isolation: all applicable notes must be consulted first. A section note that excludes a product from an entire section is dispositive, regardless of how well a heading within that section appears to describe the goods.
Heading-level classification must be completed before any subheading comparison begins. GRI 6 establishes that subheadings may only be compared within the heading where the product has already been determined to fall. Jumping directly to subheadings without first resolving the heading is a legally unsupported shortcut — and a common source of classification error that creates CBP audit exposure.
Classification Significance
The heading is the foundational unit of HTSUS classification. Every element of an import entry — duty rate, Section 301/232 applicability, antidumping/CVD scope, partner government agency requirements — derives from the heading and its subheadings. An incorrect heading assignment propagates errors through every subsequent element of the classification.
How Kanon Handles This
Kanon evaluates classification at the heading level first, as GRI 1 requires. For each candidate heading, it processes all applicable section and chapter notes through its condition-tree corpus before comparing heading text to product attributes. The heading determination — including every note evaluated and the reasoning for acceptance or rejection of each candidate heading — is documented in the Classification Support Package before any subheading analysis begins.