How to classify a product from description to HTS code

Short answer: The HS code classification process runs in a fixed order: collect the product’s facts, shortlist the headings that could describe it, and apply General Rule of Interpretation (GRI) 1, under which the terms of the headings and any Section and Chapter Notes decide. GRIs 2 to 5 come in only when GRI 1 leaves more than one heading standing. GRI 6 then picks the 6-digit subheading, and the HTSUS (US Harmonized Tariff Schedule) supplies the 8-digit rate line and the 10-digit statistical suffix. Explanatory Notes and U.S. Customs and Border Protection (CBP) rulings are evidence at each step, and the whole decision gets written down.

The usual failure is a skipped step: trusting a keyword match, or jumping to “essential character” before reading the notes. This guide covers the steps in order, then carries one product, a cordless drill kit with a battery, charger and case, through all of them, including the headings rejected and what goes in the file.

Why start with facts and not keywords?

Classification starts with facts because the tariff sorts goods by what they are, not by what they are called. A “smart bottle”, a “tumbler” and a “flask” can be the same article in law, and two products both sold as “multi-tools” can land in different chapters. Before opening the tariff, collect the following for each product:

• Materials, with the share of each by weight and, for composite goods, by value.
• Function: what the product does and how it does it (motor, battery, manual, chemical reaction).
• Condition at import: finished, unfinished, unassembled, or a kit of separate items.
• Packaging and presentation: retail-packed set, bulk, or with a case meant for long-term use.
• Specifications the tariff may split on, such as capacity, voltage, power or fiber content.
• Use and buyer, plus a cost breakdown by component if the product is a set or a composite.

Spec sheets, bills of materials and packaging photos answer most of these. If a fact is missing, ask the supplier before choosing a code; a guess here becomes an unsupported classification later.

How do the HS and the US HTS fit together?

The Harmonized System (HS) is the World Customs Organization’s 6-digit nomenclature, and the HTSUS is the US tariff built on top of it. The first six digits of a US HTS number are the HS subheading, shared with every country that uses the HS. The HTSUS adds two digits for the US tariff line, where the duty rate sits, and two more for the statistical suffix. What the first six digits mean covers the international layer in more detail.

The HS has 21 sections, ending with Section XXI for works of art, collectors’ pieces and antiques (Chapter 97). The HTSUS has 22: it adds Section XXII, which holds Chapter 98 (special classification provisions) and Chapter 99 (temporary legislation and additional duties such as Section 232 and Section 301). Chapter 99 numbers are reported alongside the product’s regular HTS number; they never replace it. A product is always classified first in Chapters 1 to 97.

How do sections, chapters, headings and notes work step by step?

Sections and chapters narrow the search, but only headings and notes have legal force. GRI 1 says so directly: section, chapter and sub-chapter titles are “provided for ease of reference only”, and classification is determined by “the terms of the headings and any relative Section or Chapter Notes”. A chapter title like “Articles of iron or steel” tells you where to look; it does not prove a steel product belongs there.

The notes do three kinds of work, and you need to read them for every heading on your shortlist:

1. Exclusions. Section XVI Note 1, for example, removes from Chapters 84 and 85 a long list of goods, including interchangeable tools of heading 82.07, such as drill bits (Note 1(o)), and articles of Chapter 90 (Note 1(m)).
2. Definitions. Section XVI Note 5 defines “machine” as any machine, apparatus or appliance cited in the headings of Chapter 84 or 85.
3. Priority rules. Section XVI Note 2 says that parts which are themselves goods of a Chapter 84 or 85 heading go to their own heading “in all cases”, and Note 3 says a multi-function machine is classified by its principal function.

Classifiers often skip past Section XVI Note 3. A machine “designed for the purpose of performing two or more complementary or alternative functions” is classified as the machine that performs the principal function. That rule operates inside GRI 1, as part of the legal notes. If it settles the heading, there is no GRI 3(b) essential-character question to ask.

How are GRI 1 to 6 applied in order?

The GRIs are applied in numerical order, and each later rule applies only if the earlier ones leave the question open. GRI 1 decides most products once the notes are read.

Two points are often misread. First, GRI 2(b) is about materials: it extends a heading for “steel articles” to articles partly of steel and then sends goods of mixed materials to GRI 3. A kit of separate articles reaches GRI 3 by the rule’s other route, because its items are “prima facie classifiable under two or more headings” for some other reason. Second, GRI 3(a) has a built-in limit. When each heading describes only part of a composite good or only some items in a retail set, the headings count as equally specific, and you move on to 3(b).

The US adds its own rules. The Additional U.S. Rules of Interpretation in the HTSUS govern headings defined by use (principal use and actual use) and the classification of parts, and they apply alongside the GRIs at the US level.

How much weight do Explanatory Notes and CBP rulings carry?

The Explanatory Notes (ENs) are persuasive guidance, not law. They are the WCO’s official commentary on the scope of each heading. When Congress enacted the HTSUS in 1988, the conference report (H.R. Conf. Rep. No. 100-576, at 549) said the ENs should be consulted for guidance and are generally indicative of the proper interpretation, though not legally binding. The Federal Circuit has relied on that legislative history, for example in Lynteq, Inc. v. United States, 976 F.2d 693 (Fed. Cir. 1992), and CBP repeats the same position in its rulings, citing T.D. 89-80, 54 Fed. Reg. 35127 (August 23, 1989).

A common error attributes the ENs’ weight to United States v. Mead Corp., 533 U.S. 218 (2001). Mead is about how much deference courts give CBP’s own ruling letters. It says nothing about the Explanatory Notes, and citing it for that point in a classification memo is a mistake a reviewer will notice.

CBP rulings are evidence of how CBP applies the tariff. Under 19 CFR 177.9, a ruling letter binds CBP for the transaction it describes, and a classification ruling applies only to articles identical to the sample or the description in the ruling. For anyone else, a ruling on identical goods is strong support; a ruling on similar goods is an argument you still have to make. Check the date and status of every ruling you rely on, because CBP modifies and revokes rulings through notices in the Customs Bulletin. The free HTS lookup tools guide shows one product where CBP’s rulings changed heading twice.

Worked example: a cordless drill kit, end to end

A cordless drill kit that contains the drill, a battery, a charger and a fitted case is classified as a set in subheading 8467.21 (hand tools with a self-contained electric motor: drills of all kinds), because the drill gives the set its essential character. A classifier gets there in eight steps.

Step 1: the facts

The hypothetical kit holds an 18-volt drill/driver (it drills holes and, with its clutch, drives screws), one 2.0 Ah lithium-ion battery pack, a plug-in charger and a molded plastic case with cut-outs for each item. Everything is packed for retail sale in one box. As an example, the importer’s cost breakdown is drill 55%, battery 25%, charger 12% and case 8%.

Step 2: candidate headings for each item

Step 3: the notes

Start with Section XVI Note 2(a). The battery and the charger are made for this drill, but each is itself a good of a Chapter 85 heading, so Note 2(a) sends each to its own heading “in all cases” when imported alone. A spare battery shipped by itself is 8507.60, not a drill part. If the kit also held a set of drill bits, Section XVI Note 1(o) would exclude them from Chapters 84 and 85 as interchangeable tools of heading 82.07.

Section XVI Note 3 settles the drill/driver itself. It performs two alternative functions, drilling and screwdriving, so it is classified by its principal function. A drill/driver is designed, marketed and bought as a drill with a clutch for driving, so the principal function is drilling. Note 3 applies at the subheading level too, because GRI 6 says the relative Section and Chapter Notes apply to subheadings. That points to 8467.21 (“drills of all kinds”) over 8467.29 (“other”). If the tool were an impact driver with no chuck for drill bits, the answer would change.

Step 4: GRI 1 cannot classify the kit as one article

No single heading describes a drill, a battery and a charger together, so the kit as presented is prima facie classifiable under 8467, 8507 and 8504. That sends it to GRI 3. Heading 8467 is more specific about the drill, but under GRI 3(a) each heading describes only some of the items in the set, so the three headings count as equally specific. GRI 3(a) cannot decide.

Step 5: is it a set put up for retail sale?

The Explanatory Note to GRI 3(b) treats goods as a retail set when three conditions are met: at least two different articles prima facie classifiable in different headings; articles put together to meet a particular need or carry out a specific activity; and packing suitable for sale directly to users without repacking. The kit meets all three. The battery and charger exist to run the drill, the activity is drilling and driving, and the box goes straight onto a store shelf. Where kits fail these tests, for example a drill packed with an unrelated flashlight, each item is classified separately; when gift sets and kits count as a retail set works through those borderline cases.

Step 6: essential character under GRI 3(b)

The drill gives the set its essential character. It is the article that does the work the buyer pays for; the battery and charger only supply power to it. The drill is also the largest share of the example cost breakdown (55%) and the bulkiest item. All the factors point the same way, which is the easy case. If two batteries and a fast charger pushed the drill’s share below half, role in use would still favor the drill, and the memo should say why value was not decisive.

Step 7: the case under GRI 5(a)

The molded case is specially shaped to hold the kit, suitable for long-term use, presented with the tools and of a kind normally sold with them. Under GRI 5(a) it is classified with the tools. It does not give the whole its essential character, so the exception in the last sentence of GRI 5(a) does not apply.

Step 8: subheading and US line

Under GRI 6 the set takes the subheading of the drill: 8467.21, under the one-dash subheading for tools with a self-contained electric motor. The classifier then reads the 8-digit line and the statistical suffixes under 8467.21 in the current HTSUS and picks the suffix that matches the drill’s description. Chapter 99 is checked last for any additional duty that applies to the product and its country of origin.

Change the presentation and the answer can change. Batteries and chargers imported in bulk for packing in the US are not put up as a retail set at import, so each takes its own heading.

What should a classification memo record?

A classification memo should let a reviewer, an auditor or you in three years follow the decision without asking anyone. The importer of record must use reasonable care in classifying goods under 19 USC 1484, and the memo is the most direct evidence of that care. Records for an entry generally have to be kept for five years from the date of entry (19 CFR 163.4). A complete memo holds:

1. Product facts and where they came from (spec sheet, BOM, photos, cost breakdown).
2. Every heading considered and the reason each was rejected.
3. The Section, Chapter and Subheading Notes applied, cited by number.
4. The GRIs applied, in order, with a sentence on why each later rule was needed.
5. Explanatory Notes referred to, described or briefly quoted.
6. CBP rulings consulted, with number, date, holding, and a note on whether the facts match and the ruling is still in force.
7. The final 10-digit HTS number and the HTSUS edition and revision used.
8. Preparer, reviewer and dates, plus what triggers a review (an HTSUS revision to the chapter, a product change, a new ruling).

Writing this for one product takes some care; writing it for a catalog of thousands is a project. TariffWolf produces this record for each SKU as it classifies: every 6-digit suggestion carries the Explanatory Notes, legal notes, GRIs and CBP or EU rulings behind it, a confidence score, and the reviewer and timestamps, and low-confidence items go to an in-house classifier before they come back. The 8-digit rate line and the statistical suffix are then chosen by your classifier or broker.

When should you ask CBP for a binding ruling?

Ask CBP for a binding ruling under 19 CFR Part 177 when the classification is a close call, the duty difference is material, and you will import the product again. Rulings are for prospective transactions: CBP will not issue one on a completed transaction (19 CFR 177.7(a)), so request it before the goods ship. CBP’s National Commodity Specialist Division says it generally issues classification rulings within 30 days of receipt. A request that sets out the facts and the competing headings, much like the memo above, gives CBP what it needs to rule.

What mistakes come up most often?

• Choosing the first keyword match without reading the notes for the heading.
• Going straight to GRI 3(b) for a multi-function machine when Section XVI Note 3 decides it under GRI 1.
• Treating every bundle as a retail set, or treating a retail set as separate items.
• Comparing subheadings at different levels, which GRI 6 forbids.
• Relying on a ruling without checking whether it was revoked or whether its facts match.
• Writing the code into the item master with no record of how it was reached.

Related reading

• The forced-labor Section 301 tariff: 9903.05 headings by country, rates and exemptions
• The Anatomy of an HS Code
• Is My Product ITAR or EAR?
• Why we removed AI from our core HS classification engine

Frequently asked questions

What is the difference between an HS code and an HTS code?

An HS code is the 6-digit international code maintained by the World Customs Organization. An HTS code is the US 10-digit number from the HTSUS: the same first six digits, then two digits for the US tariff line where the duty rate sits and two for statistical reporting.

What information do I need to classify a product?

You need the materials and their shares, the function and how it works, the condition at import, how it is packed, any specifications the tariff splits on, and the intended use. For sets and composite goods, add a cost breakdown by component, because essential character may turn on it.

Are the Explanatory Notes legally binding in the US?

No. They are persuasive. The 1988 conference report on the HTSUS (H.R. Conf. Rep. No. 100-576) described them as generally indicative of the proper interpretation, and the Federal Circuit and CBP treat them that way. They cannot override the text of a heading or a legal note.

How is a cordless drill kit with a battery and charger classified?

When the drill, battery and charger are packed together for retail sale, the kit is a set under GRI 3(b) and takes the drill’s subheading, 8467.21, because the drill gives it its essential character. Imported separately, the battery goes to 8507.60 and the charger to 8504.40 under Section XVI Note 2(a).

Follow the order (facts, notes, GRIs, subheading, record) and most products resolve under GRI 1, the hard ones show up early, and the file shows a reviewer exactly what you weighed.

For catalogs where doing this by hand is not realistic, TariffWolf’s bulk classification service follows the same sequence through GRI 6 for each SKU and returns the 6-digit HS code with the notes, GRIs and rulings applied. Your classifier adds the last four digits on top of a memo that already exists. You can send a sample file of your harder products and review the justifications before committing a full catalog.

Sources

• Harmonized Tariff Schedule of the United States: General Rules of Interpretation, Section XVI Notes, Chapters 84 and 85 (USITC)
• 19 CFR 177.9, Effect of ruling letters
• 19 CFR Part 177, Administrative rulings (including 177.7)
• CBP, Customs Bulletin Vol. 55, No. 9 (March 10, 2021), showing CBP’s standard statement on Explanatory Notes and T.D. 89-80
• 19 U.S.C. 1484, Entry of merchandise (reasonable care)
• 19 CFR 163.4, Record retention period
• CBP, Informed Compliance Publication: the Rulings Program (September 2023)