Is the international HS code always the same as Vietnam's HS code?

The first 6 digits are the same worldwide; the last 2 digits are the AHTN/ASEAN-specific extension that Vietnam applies.

Who is responsible if the HS code is misdeclared?

The customs declarant (the goods owner or an authorized customs agent) is legally responsible for the accuracy of the declared HS code.

Can you request an HS code determination before exporting/importing?

Yes — the General Department of Customs has an advance-ruling procedure for the code, applicable to shipments planned for future export/import.

What Is an HS Code? Why Vietnam's Code and the International Code Look Alike but Aren't

Many shippers looking up an HS code online confuse the international 6-digit code with Vietnam's 8-digit code — leading to misdeclaration, tax reassessment, or penalties. This article explains the mechanism clearly and how to apply it correctly.

What is an HS Code

The HS Code (Harmonized System) is a goods-classification numbering system built by the World Customs Organization (WCO), used in common by more than 200 countries to standardize how import-export goods are named, classified and taxed.

The relationship between the international code and Vietnam's code (AHTN)

This is a point many people misunderstand: the first 6 digits of an HS code are the universal global code, set by the WCO and used identically by every country. The next 2 digits (digits 7-8) are an extension specific to the ASEAN bloc, called the AHTN (ASEAN Harmonized Tariff Nomenclature) — Vietnam applies this full 8-digit AHTN system under Circular 31/2022/TT-BTC (Vietnam's Import-Export Goods Nomenclature).

So two businesses in two different ASEAN countries can share the same first 6 digits but differ in the last 2 — because each country has the right to add further detail within the shared ASEAN AHTN framework. When working with a foreign partner, it's best to cross-check the international 6-digit HS code first, then look up the corresponding Vietnamese 8-digit code to declare correctly.

The 6 General Rules of Interpretation (GRI)

Circular 31/2022/TT-BTC (Appendix II) sets out 6 rules applied in sequence to determine the correct HS code for an item: from relying on the heading name and section/chapter notes (Rule 1), to how to handle incomplete/mixed goods (Rules 2-3), goods not specifically named (Rule 4), packaging (Rule 5), and classification at the subheading level (Rule 6). The most important principle: always apply Rule 1 first, and only move to a later rule if the earlier one cannot resolve the classification.

How to look up the correct HS code

Determine the nature, composition and main use of the goods.
Look up the AHTN Nomenclature under Circular 31/2022/TT-BTC or the current Export-Import Tariff Schedule.
Cross-check against technical documentation and product catalogues — customs has the authority to request an assessment if there's doubt.
If uncertain, request an advance ruling on the code from the General Department of Customs before completing procedures.

Risks of misdeclaring the HS code

Under Decree 128/2020/NĐ-CP, misdeclaring the HS code in a way that results in an underpayment of duty can incur a penalty of 10-20% of the underpaid tax amount, plus full back-payment of the tax and late-payment interest. Where the goods name was declared correctly but the HS code was determined wrongly for the first time, there is a more flexible handling policy if the business can demonstrate good faith and no sign of fraud. For deliberate misdeclaration intended to evade tax, the penalty and legal consequences are far more severe.