Customs Classification – A Practical Guide to Classifying Goods

What is customs classification?

Customs classification, also known as tariff classification or commodity classification, is the process of determining where a product belongs within a customs tariff.

Internationally, the foundation is the Harmonized System (HS), which provides a structured nomenclature for goods. Countries and customs territories can extend that structure. Within the European Union, HS is developed further through the Combined Nomenclature (CN) and TARIC.

The result is a commodity code that customs authorities and businesses use to determine how goods should be treated when imported or exported.

See how to find the correct HS code →

Why is customs classification important?

Classification can affect much more than the ordinary customs duty rate. Depending on the product, origin and trade flow, it can connect to customs duties, tariff preferences, quotas, anti-dumping and countervailing duties, restrictions, licences, certificates, trade statistics and other trade-policy measures. It also connects directly to rules of origin, because many product-specific origin rules are organised by tariff classification.

An incorrect commodity code can result in incorrect declarations, unexpected duties, delays, corrections and other compliance problems.

Customs classification is about the product – not just its name

Commercial product names are designed for customers. Customs nomenclatures are not. Descriptions such as “industrial controller”, “machine part”, “electronic module”, “plastic fitting” or “smart device” may be understandable in a catalogue but insufficient for customs classification.

Two products sold under similar names can have different classifications because their materials, functions or technical characteristics differ.

The classification process should therefore start by understanding the actual goods.

What information is needed for customs classification?

The information required depends on the product. Useful information can include detailed description, material or composition, primary function, operating principle, technical specifications, dimensions, capacity, ingredients, manufacturing method, completeness, parts or accessories, components, intended use, drawings, photographs and product data sheets.

The key is identifying which characteristics are relevant to the possible tariff headings.

Examples of information that can change a classification

For plastic or metal products, material alone may not determine the classification. Function, level of manufacture and whether another heading describes the item more specifically can also be relevant.

How does the customs classification process work?

1. Understand the product. What is it, what is it made from, what does it do, how does it work and how will it be imported?
2. Identify potentially relevant tariff headings. Several sections, chapters or headings may initially appear possible.
3. Read the tariff wording carefully. Classification is based on heading and subheading wording, not simply keyword matching.
4. Apply the classification rules. The General Rules for Interpretation provide the framework, including for incomplete goods, mixtures, composite goods and sets.
5. Check legal notes and relevant guidance. Section and chapter notes can contain definitions, exclusions and direct instructions.
6. Determine the required national or regional classification. For EU trade, classification may need to continue from HS into CN and TARIC.
7. Document the reasoning. Record product information, selected classification, reasoning, supporting documents, review date and relevant guidance.

Understand the difference between HS, CN and TARIC →

What are the General Rules for Interpretation?

The General Rules for the Interpretation of the Harmonized System, often referred to as the GIRs or GRIs, provide the basic framework for classification within the HS.

Classification starts with the terms of the headings and relevant section or chapter notes and then follows the applicable interpretative rules. The rules also provide methods for incomplete goods, mixtures, composite goods and products that could fall under several headings.

Classification is more than finding an HS code

Finding an HS code sounds like a search problem: “Which number matches this product?” Classification is a reasoning process: “Based on the characteristics of this product and the applicable rules, where does it belong in the nomenclature?”

A database search can identify possible codes. A classification process determines why one of those codes is appropriate.

Common customs classification mistakes

Searching only by product name

Keyword searches are useful for finding possibilities but should not replace classification analysis.

Copying the supplier's HS code

Supplier classifications can be useful starting points but should be verified. Can I use my supplier's HS code?

Reusing a code from a similar product

Small differences in material, construction or function can sometimes result in a different classification.

Ignoring section and chapter notes

Legal notes can include important inclusions and exclusions.

Choosing the code with the lowest duty

Duty rates are a consequence of classification, not a method for choosing it.

Never reviewing old classifications

Products change and tariff nomenclatures are updated, so important classifications should be reviewed when circumstances change.

Who should manage customs classification in a company?

Depending on the organisation, classification may involve customs or trade compliance, logistics, supply chain, purchasing, engineering, product management, external customs specialists and customs representatives.

One of the biggest challenges is often not who enters the commodity code. It is getting the right product information from the people who actually understand the product.

A strong classification process connects customs knowledge with technical product knowledge.

How should companies manage large numbers of products?

Classification becomes increasingly difficult with hundreds or thousands of SKUs. A structured workflow helps create consistency:

1. New product created
2. Required technical information collected
3. Existing supplier classification checked
4. Product analysed
5. HS/CN classification determined
6. Higher-risk cases flagged for specialist review
7. Reasoning documented
8. Classification stored in product master data
9. Classification reviewed when necessary

This makes the process more scalable and reduces the risk of different employees classifying similar products inconsistently.

Can AI help with customs classification?

AI can be particularly useful during the initial analysis. A large part of classification work involves understanding product descriptions, identifying missing information and narrowing down potentially relevant parts of the tariff.

AI-assisted analysis can help analyse product information, identify possible classifications, highlight missing information, compare alternatives, create a starting point for review and process new products more efficiently.

IGLA Customs uses AI-assisted analysis to provide a preliminary classification based on available product information. The purpose is not simply to return a commodity code, but to make the process faster and provide a better basis for the decision.

AI and customs expertise work well together

Not every product carries the same level of risk. A straightforward, low-value product may require a different level of review from a technically complex product imported in large volumes.

AI can handle the initial analysis quickly. Cases involving uncertainty, significant financial exposure or complex classification questions can then be escalated to a customs specialist.

When should a customs specialist be involved?

Specialist review may be appropriate when several headings appear possible, the product has multiple functions, technical characteristics are complex, classification affects significant duty, anti-dumping measures may apply, licences or restrictions depend on classification, large volumes are involved, the code will be reused widely, customs has questioned the classification or stronger documentation is needed.

Where legal certainty is particularly important in the EU, businesses can also consider applying for Binding Tariff Information (BTI).

Better classification starts with better information

Many classification problems are actually information problems. A description such as “spare part” may not give even an experienced specialist enough information.

A better process asks the right questions first: What is the product? What is it made from? What does it do? How does it work? Is it complete? What is it used with? Which technical characteristics distinguish it from similar products?

Once those questions are answered, classification becomes considerably more reliable.

Build customs classification into your trade process

Classification should not be treated only as something that happens when a shipment reaches the border. Ideally, it happens earlier: product created or sourced → technical information collected → classification performed → review where necessary → commodity code stored in master data → code available for purchasing, logistics and customs processes.

This reduces last-minute questions and gives businesses more control over customs data before goods are shipped.