Correct classification of goods is one of the most important elements of import and export operations. The correct code determines not only the amount of customs duties payable but also whether a particular product is subject to restrictions, requires additional documentation, or must comply with specific standards.

The code assigned to a product is not merely a formality—it forms the basis for determining the customs duty rate, VAT, trade protection measures, and the obligations related to customs clearance. Therefore, before starting international trade, it is worth understanding what a CN code is, where to find it, and how to avoid mistakes when classifying goods.

Key takeaways from the article

• The correct CN code determines the customs clearance procedure and the amount of duties payable.
• Incorrect classification may result in additional charges, declaration corrections, and customs inspections.
• Official online CN code and customs tariff search tools are available.
• Goods are classified based on their composition, structure, intended use, and function.
• If there is any uncertainty, you can apply for a Binding Tariff Information (BTI) decision.

What is a CN code and what is it used for?

The short answer is that it is an eight-digit code used to classify goods within the European Union. It enables customs authorities to determine which regulations apply to a specific product.

The CN code (Combined Nomenclature) is the primary system for classifying goods used during import and export within European Union member states.

Every product has its own place within the Combined Nomenclature. Each digit represents an increasingly specific product category—from a general classification to a particular type of product. For example, electronics, clothing, automotive parts, and food products each have separate groups of codes. Even a minor difference in the material used or the intended purpose of a product may require a different code.

This is why classification requires a detailed analysis of a product’s characteristics rather than relying solely on its commercial name.

How can you find the correct code for your product?

First, you should accurately determine what the product actually is. Only then should you begin searching for the appropriate classification.

When identifying a product, it is worth considering:

• the material it is made of,
• the product’s function,
• the way it operates,
• its intended use,
• its degree of processing.

The more detailed the description, the greater the likelihood of assigning the correct code.

It is important to remember that the name used by the manufacturer does not always correspond to the customs classification. For example, two products sold as “electronic accessories” may belong to completely different tariff headings.

Where can you search for customs codes, and which tools should you use?

The safest approach is to use the official databases maintained by customs authorities. These are regularly updated and reflect the applicable regulations.

A customs code search tool allows you to verify the classification of goods as well as the applicable customs duty rates and import requirements.

The most commonly used tools allow searches by:

• product name,
• CN code,
• keywords,
• tariff chapter,
• HS codes.

Good to know

The first search result is not always the correct one. In many cases, it is necessary to read the chapter notes and the explanatory notes to the Combined Nomenclature.

Do the CN code and the customs tariff code mean the same thing?

In everyday language, the two terms are often used interchangeably. From a legal perspective, however, they do not always mean exactly the same thing.

The customs tariff code generally refers to the classification used to calculate customs duties and apply the relevant trade regulations. The CN code forms the basis of this classification within the European Union, while the full tariff may include additional digits used in the TARIC system. These additional digits make it possible to account for anti-dumping measures, tariff quotas, and preferences resulting from international trade agreements.

For this reason, customs clearance procedures often require more detailed classifications than the eight-digit CN code alone.

What determines the correct classification of goods?

The product name printed on the packaging does not determine the classification. What matters are the product’s actual characteristics.

Classification is based primarily on the General Rules for the Interpretation of the Combined Nomenclature.

The following factors are taken into account, among others:

• material composition,
• technical characteristics,
• product function,
• intended use,
• whether the product is complete.

For example, a ceramic mug and an insulated travel mug may be classified under completely different tariff groups, even though both are used for drinking beverages.

What information does a CN code search tool provide?

The classification itself is only the beginning. Search tools contain much more useful information.

A CN code search tool allows users to check not only the classification number but also the applicable customs duty rates and additional import requirements.

After finding the correct code, users can verify, among other things:

• the applicable customs duty rate,
• existing restrictions,
• required permits,
• trade protection measures,
• additional codes used within the TARIC system.

This enables entrepreneurs to estimate the total cost of importing goods before the shipment even takes place.

What are the consequences of assigning the wrong code?

The consequences can be far more serious than simply correcting the documentation.

Incorrect classification may result in:

• additional customs duties,
• interest charges,
• corrections to the customs declaration,
• delays in customs clearance,
• customs inspections.

If the customs authority determines that an incorrect code has been used, the entrepreneur may be required to pay all outstanding duties together with accrued interest.

Pro tip

For unusual or difficult-to-classify products, it is advisable to apply for a Binding Tariff Information (BTI) decision. This document provides legal certainty during customs clearance and significantly reduces the risk of disputes with customs authorities.

How to check the customs duty rate for a specific product?

First, the correct CN code must be determined. Only then is it possible to establish the applicable duties.

The customs tariff code allows you to determine the applicable customs duty rates and the regulations that apply to a specific product. The level of charges is also influenced by the country of origin of the goods. The same product may be subject to different rates depending on the country from which it is imported.

Trade agreements concluded by the European Union with individual countries are also important.

Does every importer need to know product customs codes?

Yes, even if customs formalities are handled by a customs agency. The responsibility for correct data still lies with the entrepreneur.

Product customs codes are necessary for customs declarations, calculating duties, and applying the relevant import and export regulations. Knowing the correct code helps avoid many problems already at the stage of planning a transaction. It also makes it easier to estimate the total cost of importing a product before placing an order with a foreign supplier.

Frequently asked questions about customs codes and customs tariffs

Is the CN code valid in all European Union countries?

Yes. The Combined Nomenclature is a common classification system used in all EU member states. This ensures that goods are identified according to the same rules regardless of the country of clearance.

Can one product have more than one CN code?

As a rule, no. A single specific product should have one correct code based on its characteristics. Problems usually arise when a product is multifunctional or consists of several components.

How often do CN codes change?

The Combined Nomenclature is updated every year. Therefore, it is important to check whether a previously used code is still valid before the next import or export operation.

Does a customs code search tool show the customs duty rate?

Yes, official systems allow users to check not only the classification but also applicable customs duty rates, additional measures, and import requirements for specific goods.

What should you do if you are unsure which code to choose?

The safest solution is to consult a customs agency or apply for a Binding Tariff Information (BTI) decision. This helps avoid errors that could result in additional costs during customs clearance.