In Detail
At the 6-digit HS level, U.S. law requires conformity with the international HS — U.S. subheadings cannot contradict the HS heading or 6-digit subheading. Below 6 digits, U.S.-specific 8-digit subheadings are a domestic matter. At the 10-digit level, statistical suffixes are entirely U.S.-specific and have no international counterpart.
Even at the 6-digit level, divergence between U.S. and foreign classifications can occur. Different countries' customs authorities classify goods independently under the same HS text. When a heading's text is ambiguous, U.S. CBP and a foreign customs authority may reach different 6-digit classifications for identical goods — each consistent with the HS text as interpreted by their respective legal systems.
Certificates of origin, foreign entry documents, and supplier declarations often include 6-digit HS codes assigned by the exporting country's customs authority. These codes are useful starting points for identifying the heading family but are not controlling for HTSUS classification. CBP classifies independently, and a mismatch between the supplier's HS code and the HTSUS code is not automatically a problem — but a significant divergence warrants investigation.
Importers who reference foreign tariff databases or seek classification guidance from overseas suppliers should be aware that foreign classifications — even for identical goods from the same supplier — may not match the correct HTSUS classification. The HTSUS analysis must be performed independently for U.S. purposes.
Classification Significance
Reliance on a foreign country's HS classification as a substitute for HTSUS analysis is a classification methodology error. Differences in national classification practice, note structures, and legal interpretation mean that even goods classified identically in the international HS may carry different 8-digit subheadings — and different duty rates — in the HTSUS.
How Kanon Handles This
Kanon performs HTSUS classification independently of any foreign HS codes associated with a product. Where a foreign HS code is available as reference data, Kanon notes it but does not treat it as determinative. The Classification Support Package reflects the HTSUS analysis performed under U.S. law.
Frequently Asked Questions
If a supplier provides a 6-digit HS code, can I use it for my HTSUS filing?
Only as a starting point. You must independently verify the correct HTSUS classification — the supplier's HS code reflects their country's classification, which may or may not match the U.S. determination.
At what digit level must the HTSUS conform to the international HS?
Through 6 digits. The U.S.-specific subheadings at the 7th–10th digits are national additions not required by the international HS.