What HS Section + Chapter Notes Actually Say (and Why They Win Tariff Disputes)

Short version. The free HS-code lookup tools show you the description and the duty rate. They almost never show you the section and chapter notes — the legally-binding interpretation rules that decide whether your classification is right or wrong. Most classification disputes are won or lost on the notes, not on the description. This post walks through what they are, why they matter, and how to actually read them.

The notes are part of the law, not commentary

When you import into the EU, the duty you owe is determined by the Combined Nomenclature — laid out in Annex I to Council Regulation (EEC) 2658/87. That Annex contains:

• The General Rules of Interpretation (GRIs) — six rules that govern HOW to classify (rule 1: classify by heading text; rule 3: most specific description wins; etc.).
• Section notes — at the start of each of the 21 sections.
• Chapter notes — at the start of each of the ~99 chapters.
• Subheading notes — at the start of certain subheadings, narrower scope.
• The heading and subheading text itself.

All five carry equal legal weight. When the EU Commission or a national customs authority issues a Binding Tariff Information ruling — the formal classification decision — the reasoning walks through the GRIs and cites the applicable section, chapter, and subheading notes. The duty rate is downstream of that interpretation.

Three patterns to recognise

Pattern 1: “This section/chapter does NOT cover”

The most common form. Tells you what classifies SOMEWHERE ELSE despite looking like it might fit here. Section XV (base metals, chapters 72–83) opens with a long list of what the section DOESN'T cover — articles of jewellery (Chapter 71), surgical instruments (Chapter 90), clocks (Chapter 91), and so on. If your goods are a steel widget that's actually a clock part, the section note redirects you out of Section XV.

See the headings in this section to feel the pattern:

• 7208 — flat-rolled iron / non-alloy steel, hot-rolled
• 7210 — flat-rolled, clad / plated / coated
• 7301 — sheet piling / iron and steel angles

Pattern 2: “For the purposes of this chapter, X means”

Definitions. Chapter 72 (iron and steel) note 1 defines pig iron, spiegeleisen, ferro-alloys, steel, stainless steel, and other alloy steel— each with specific carbon-content thresholds. Whether your product is “steel” or “alloy steel” for tariff purposes is decided by Chapter 72's definition, not by metallurgical convention or your supplier's spec sheet. Get this wrong and the whole classification is downstream wrong.

The same pattern shows up in:

• 3901— primary polymers of ethylene; Chapter 39 note 4 defines what counts as a “copolymer”
• 3920— plastic plates and sheets; the same chapter note narrows what “cellular” vs “non-cellular” means
• 1101— wheat / meslin flour; Chapter 11 note 2 defines the starch / ash limits that draw the line between “flour” and “groats and meal”
• 1108 — starches / inulin; same chapter note governs

Pattern 3: “X shall be classified in heading Y”

Explicit redirects. Chapter 84 note 1 says “subject to the operation of note 7 to chapter 87, this chapter does not cover … vehicles for the transport of persons or goods, of section XVII” — telling you that even though your goods might LOOK like they belong in machinery (chapter 84) they go to vehicles (section XVII).

Chapter 85 has parallel redirects for electrical machinery combined with mechanical apparatus. The boundary between chapter 84 and chapter 85 is one of the most contested areas in tariff classification — the notes are the deciding rules:

• 8408 — compression- ignition (diesel) engines; chapter 84 note 7 governs the chapter 84 / chapter 85 boundary for combined apparatus
• 8443 — printing machinery; section XVI note 4 (machines for special purposes) is one of the most-cited notes in BTI rulings
• 8501— electric motors and generators; chapter 85 note 1 excludes electrical apparatus that is “part of” chapter 84 machinery
• 8537— control panels for electric distribution; section XVI note 2 governs the “parts of” rule

Why DIY classifiers miss the notes

Most online HS-code lookup sites show you a tree of descriptions and the duty rate. They don't show you the section or chapter notes. The omission isn't deliberate — most sites scrape the WCO HS catalogue, which doesn't publish the notes in the same data structure as the descriptions, and adding them is a real ingestion job. So they don't.

That gap is why a competent customs broker is irreplaceable for non-trivial classifications: brokers read the notes because they've eaten the cost of getting it wrong. We render the notes inline on every code page so you're at least in the same room as the rules — but if you're dealing with a borderline classification (textiles v non-textile, machinery v vehicle, food v feed v industrial input), get a professional in before declaring.

Chapters where the notes carry the most weight

Some chapters classify by description — pretty unambiguous. Some chapters classify by note — the description alone doesn't resolve the line. The note-heavy ones are where you should slow down and read:

• Section XV — base metals (chapters 72–83). The whole section is a maze of carbon-content definitions and “parts of general use” rules. 7208 is a good starting point.
• Section XI — textiles (chapters 50–63). Composition by weight, garment vs accessory, knit v woven — every rule lives in a note. 6201(men's coats) and 6204(women's suits) are typical battlegrounds.
• Section XVI — machinery (chapters 84–85). The chapter 84 / 85 boundary, the “parts of” rules, the “machines combining different functions” rule. Some of the most-litigated tariff disputes hinge on section XVI note 3 alone.
• Chapter 44 — wood. 4407 (sawn wood) has specific moisture-content and dimension thresholds for distinguishing planks from dimensional lumber from blocks.
• Chapter 1 — live animals. Look at 0102 (live bovines) — the notes draw the line between commercial slaughter categories and breeding stock for sanitary-control purposes.

How to actually use this

1. Look up your code on our HS code index — pick the chapter, then drill to your code.
2. Read the section + chapter notes block above the duty rates. Both are collapsed by default; click to expand.
3. Read every “does NOT cover” clause. If your goods could plausibly fit one of the excluded categories, you're in a borderline area — reclassify or get a BTI.
4. Read every definition. If your product is “steel” but Chapter 72 note 1 defines it differently than your engineering spec, the note wins for tariff purposes.
5. Cite the note in any correspondence with your broker / customs authority. “Per Section XV note 2 …” beats “I think this code applies” every time.

FAQ

Sources. Council Regulation (EEC) 2658/87 on tariff and statistical nomenclature (the legal basis for the Combined Nomenclature): eur-lex.europa.eu/eli/reg/1987/2658/oj. Section + chapter notes refreshed weekly from HMRC's per-commodity tariff API, which mirrors the EU Annex I text.