1. The question
A product has one HS code. Why does it appear with different codes in different countries?
Because the harmonisation stops at six digits.
2. The six-digit floor
The Harmonized System harmonises the first six digits across all members.
`8471.30` means the same thing in every member’s schedule: portable automatic data processing machines, weighing not more than 10 kg.
Beyond six digits, each member subdivides according to its own trade policy, statistical needs and regulatory structure.
3. The national subdivisions
European Union
The Combined Nomenclature extends to eight digits, and the TARIC to ten.
The eight-digit CN code determines the duty rate. The TARIC subdivides for regulatory measures and quotas.
United States
The Harmonized Tariff Schedule extends to ten digits, of which the first eight are for duty and the last two for statistics.
China
The ten-digit tariff schedule, with the regulatory categories attached.
ASEAN
Eight-digit national schedules, with separate regimes for AFTA preference.
4. Why the subdivisions differ
Tradability
A country with significant trade in a product subdivides it finely. A country with little trade does not.
Regulation
A country with specific regulatory requirements for a product category subdivides to capture them.
Statistics
Trade policy needs granular data.
Tariff structure
Different tariff phase-downs under different agreements.
5. The practical consequence for origin
Under a free trade agreement, the product-specific rule of origin is expressed by HS code.
The agreement’s own nomenclature, usually based on the HS at six digits or a partner-specific schedule, determines the rule.
A product that qualifies under one agreement’s rule may not qualify under another’s, because the rule is attached to a different code.
6. The practical consequence for the certificate of origin
The certificate of origin records the HS code.
Which code should be recorded: the six-digit HS code, or the destination’s national code?
Practice varies by agreement and by destination. Some require the destination’s national code, some accept six digits.
Where the certificate records six digits and the destination’s entry uses ten, the customs authority maps them. Where the mapping is not straightforward, a query follows.
7. The mapping problem
A Chinese ten-digit code and a destination ten-digit code may not correspond one-to-one.
Several Chinese codes may map to one destination code.
One Chinese code may split across two destination codes.
Where the mapping is ambiguous, the goods description becomes decisive.
8. Common errors
Reusing the Chinese export code at destination
Only the six digits harmonise.
Assuming the six-digit code is sufficient
It is for some purposes and not others.
Certificate of origin code not matching the destination schedule
A query at the destination.
Assuming the mapping is unique
One-to-many cases are common.
9. What to do
Record the six-digit code, which is harmonised and portable.
Determine the destination’s national code for the import declaration.
Where the certificate of origin requires a national code, use the destination’s.
Where the mapping is unclear, support the classification with a goods description detailed enough to resolve it.
10. Closing view
The harmonised system delivers exactly what its name promises — harmonisation to six digits — and exporters who expect more are misled by the name.
The national digits are where the tariff, the regulation and the origin analysis actually live.
*This article is based on the Harmonized Commodity Description and Coding System and national tariff schedules. Exporters and importers should confirm classification with the relevant customs authority.*