International foundation
HS commonly refers to the shared 6-digit structure
The World Customs Organization’s Harmonized System organizes traded goods through sections, chapters, headings and subheadings. Participating jurisdictions generally share the classification structure through six digits, while each jurisdiction can extend it for local tariff and statistical needs.
A six-digit HS code alone may be insufficient for a US customs entry or an exact US duty estimate.
United States extension
HTSUS adds US tariff lines and statistical reporting
The US International Trade Commission publishes the Harmonized Tariff Schedule of the United States. The schedule contains US legal text, rates of duty and statistical detail. CBP administers and interprets the schedule for import entries.
- The first six digits follow the international HS structure.
- Digits seven and eight identify US tariff-rate lines.
- Digits nine and ten provide US statistical reporting detail where required.
Calculator input
Use the complete 10-digit US code when available
TariffCalc can search shorter headings for research, but a complete declarable 10-digit code gives the strongest basis for a US estimate. Some ordinary rates are inherited from a parent heading; Chapter 99 measures and product-specific conditions can still require additional review.
Classification risk
A similar product name does not prove the same code
Classification can depend on material, composition, function, condition, processing, measurements and principal use. Search results are research aids, not a binding classification. For material uncertainty, consult CBP guidance, a qualified customs professional or a binding ruling process.
Questions
Frequently asked questions
Is an HS code always six digits?
The internationally harmonized portion is generally six digits. Jurisdictions extend that structure with additional digits for national tariff and statistical purposes.
Is an HTS code the same as a Schedule B number?
No. HTSUS is used for US imports. Schedule B is the US export classification system, although the first six digits are often related through the HS structure.
Who publishes and administers the US HTS?
The US International Trade Commission publishes the HTSUS. US Customs and Border Protection administers it for import transactions.