Check the Code Structure Before Tariff Research
HS Code Structure & Format Checker
Clean a tariff code, compare its digit length with the selected market, and separate its chapter, heading, subheading, and national extension.
Structure Check Result
A format match confirms the digit structure only, not the product classification.
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How to Read the Structure Check
The checker separates the universal six-digit HS core from any market-specific extension without claiming what product the code covers.
Chapter and Heading
The first two digits identify the chapter. The first four digits form the heading used to organize a broader class of goods.
HS Subheading
The first six digits form the international HS subheading. Product interpretation still depends on descriptions and legal notes.
National Extension
Digits after position six are market-specific tariff or statistical subdivisions. Required lengths can differ by jurisdiction.
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Frequently Asked Questions
What can this HS code checker confirm?
It confirms whether the entered value contains an acceptable sequence of digits and whether its length matches the selected market format. It also separates the chapter, heading, six-digit HS subheading, and any national extension.
Does a complete result mean the classification is correct?
No. A complete result only means the code matches the expected digit structure. Confirm the product description, classification, legal notes, duty treatment, restrictions, and current validity in the destination market’s official tariff source.
Why are the first six digits important?
The international Harmonized System is structured around a two-digit chapter, four-digit heading, and six-digit subheading. Markets can add further digits for national tariff and statistical purposes.
Can I paste a code with spaces, dots, or hyphens?
Yes. The checker removes spaces, dots, and hyphens before counting digits. Other characters are rejected so they are not silently treated as part of a tariff code.
Which market formats are included?
The tool includes common working lengths for the international six-digit HS, United States HTS, European Union CN and TARIC, United Kingdom, China, Japan, and South Korea, plus a custom digit-length option.
Does the tool use live customs or tariff data?
No. It runs entirely in the browser and checks structure only. Use the related official-search tools to verify the current code, description, duty rate, measures, and effective date.
Related Free Tools
Continue from structure checking into official tariff research, customs portals, and user-supplied duty estimates.