The foundation
Harmonized System code: what it is and how to find yours
A Harmonized System code is the 6-digit number that tells customs authorities what a product is. Nearly every trading nation uses the same six digits, then extends them locally. The code decides your duty rate, so finding the right one is where importing starts.
Anatomy of a code: a cotton t-shirt
6109.10.00
- 61
- Chapter: knitted or crocheted apparel. Woven apparel lives one chapter over, in 62, and that single distinction moves duty rates.
- 6109
- Heading: t-shirts, singlets and similar garments.
- 6109.10
- Subheading: of cotton. A polyester version drops to 6109.90 instead.
- .00+
- National digits: each country appends its own, like the 10-digit US line in the Harmonized Tariff Schedule.
Who maintains it, and why it matters to you
The World Customs Organization maintains the Harmonized System and over 200 countries and territories classify trade with it. Your duty rate, your import tax treatment, trade statistics, licensing requirements and many origin rules all hang off this number. Misclassify and you either overpay duty on every entry or underpay and meet penalties and holds later; both failure modes are quiet until they are expensive. The plain-English walkthrough in what is an HS code goes deeper on the system itself.
How to find your Harmonized System code
The classical route: read the section and chapter notes, apply the General Rules of Interpretation in order, and check the near-miss headings. It works, and for contested cases a broker or a binding ruling is still the right call. The practical route for routine SKUs: describe the product, with its material, function and construction, and let an engine that has read the schedule propose the code and show its reasoning. That is what the live Tariffwise demo does, free, on any product you type, with the runner-up codes and the estimated duty attached.
The three details that decide most classifications
Material (cotton vs polyester, steel vs plastic), function (storage battery vs charger), and construction (knitted vs woven, single-wall vs vacuum-insulated). Most classification arguments, and most duty differences, trace back to one of these three. Describe them clearly and the right heading usually falls out; omit them and any lookup, human or AI, is guessing.
Find your code now, keep the rationale for later.