HS codes: pick one you can defend at the border
How the code is structured, why the first six digits are the world's and the rest are the importer's, and the checklist that keeps a ruling valid.
The Harmonized System names every traded good with six digits. Countries add more digits for their own tariff lines, which is why your forwarder asks for ten in the United States and eight in Korea. The six you choose yourself; the rest follow your importer's tariff schedule.
How a code is built
Chapters (first two) go by material or industry, headings (four) narrow to a product group, subheadings (six) split by kind or capability. Read the chapter and heading notes before the subheadings: an exclusion note one page earlier decides more cases than the text you are reading.
The General Rules of Interpretation decide the hard cases: mixture by essential character, sets by the component that gives them their role. When two codes both look right, the notes and the rules, not intuition, pick one.
Why the code is money
The code drives the duty rate, the FTA preference claim, the import licence question and the safety rules that apply. A wrong code that undervalues duty is what customs fines are made of; a wrong code that overpays is money left with the border. Korea's customs reads classifications actively, and an advance ruling is how you fix one before it becomes an audit finding.
Keeping the classification defensible
Write the reasoning down: which heading text matched, which note excluded the alternative, which ruling you followed. Korea Customs' advance ruling on your exact product is the strongest document to hold; a broker's opinion is a start, not a defence.
Where Ara helps
Give Ara your product spec and ask it to walk the heading notes with you, write the reasoning into a classification memo, and keep every version beside the certificates it belongs to. The memo stays on your PC.
Not sure where to start? Type a product name and get the first four digits of its HS code, free: TradeGraph HS code finder (opens in a new tab)
Turn the guide into your next shipment's documents.
Ara runs on your own PC and drafts the export documents with you: it reads the LC terms, fills the checklist and keeps every version. You stay the one who signs.