To find the HS code for a product, work from function down to detail in four steps: name what the product does, pick the chapter that covers that kind of good, narrow to the heading and subheading using the section and chapter notes, then confirm the full 10-digit line in your country's tariff schedule. In the US that final line is the HTS number, and it is the one that carries the duty rate. The whole method takes minutes once you stop guessing keywords and start reading the structure.
Below is the process customs professionals use, applied to real products, plus the traps that make importers overpay. If you would rather skip the manual walk, describe your product on the live classifier and it returns the code and the reasoning, but it helps to know what the tool is doing under the hood.
Step 1: describe what the product does, not what it is called
The Harmonized System classifies goods by function and material, not by brand or marketing name. A "power bank" is a lithium-ion storage battery. A "smart mug" is either a heating appliance or a ceramic article depending on how it works. A "gaming chair" is seating. Before you touch a tariff, write one plain sentence: what the item is, what it is made of, and what it does. That sentence is what drives every later decision, and a vague sentence is where most misclassifications begin. If you are working from a supplier's PDF invoice, it is worth pulling the product descriptions and line items into a spreadsheet first, so you classify from the real specification instead of a sales listing.
Step 2: find the chapter (the first two digits)
The tariff is organized into 21 sections and 97 chapters, and the chapter is your anchor. Chapters run roughly from raw materials at the front to finished machinery and instruments at the back. Textiles sit in Chapters 50 to 63, footwear in 64, base metals in 72 to 83, machinery in 84, electrical goods in 85, and vehicles in 87. Getting the chapter right removes 90 percent of the wrong answers, because a code in the wrong chapter is almost always wrong.
A quick example. A stainless steel water bottle could feel like it belongs with kitchenware, but vacuum flasks have their own heading, 9617, in Chapter 96. A plain steel bottle without the vacuum wall lands in Chapter 73 as an article of steel instead. Same object to a shopper, different chapter to customs, and a different duty.
Step 3: narrow to heading and subheading, and read the notes
Once you have the chapter, the four-digit heading and six-digit subheading come from the specifics: material, construction, and use. This is where the section and chapter notes matter, because they are legally binding and they routinely override what feels intuitive. Notes tell you when a part follows its parent machine, when a set classifies by its "essential character", and when an item is explicitly excluded from a chapter you assumed it belonged to.
The General Rules of Interpretation, six rules printed at the front of the tariff, are the tie-breakers. Rule 1 says the headings and notes govern. Rule 3 handles mixtures and sets by essential character. Rule 4 handles goods most akin to a listed item. You do not need to memorize them, but you should know they exist, because a classification that ignores the notes is the kind that fails an audit.
Step 4: confirm the full national code
The first six digits are the international HS code, shared by more than 200 countries. Your country then adds digits. The United States extends the six-digit HS code to a 10-digit HTS code, and only that full line carries the duty rate and any trade-remedy tariffs. Filing the 6-digit code alone is not enough for a US entry. For the difference between the international and US numbers, see HS code vs HTS code.
A worked example, start to finish
Take a pair of canvas sneakers with a rubber sole. Step 1: the function is footwear; the sole is rubber, the upper is textile. Step 2: footwear is Chapter 64. Step 3: rubber or plastic sole with a textile upper is heading 6404, and because these are everyday sneakers rather than dedicated sports shoes, the subheading is 6404.19. Step 4: the US splits 6404.19 by price per pair, and cheaper pairs can owe 37.5 percent while pairs over 12 dollars can drop toward 9 percent. One product, four steps, a defensible code. The same walk works for a consumer electronic or a piece of furniture; only the chapter changes.
Common ways people get the code wrong
| Mistake | What happens | Fix |
|---|---|---|
| Classifying by product name | You match a keyword, not a function, and land in the wrong heading | Write the function-and-material sentence first |
| Treating a part like a finished good | Parts often follow their parent machine and carry a different rate | Check the chapter parts note before you classify |
| Stopping at six digits | The duty rate lives in the 10-digit US line, not the HS root | Always resolve the full HTS number |
| Ignoring value breaks | The same style can sit in different duty brackets by price | Confirm the declared value per unit |
How to find the HS code for a product for free
You can do the whole process at no cost. The US International Trade Commission publishes the full Harmonized Tariff Schedule online, and you can read the chapter notes and General Rules there. The slow part is interpretation: matching your exact product to the right heading among near-identical options. That is the step an AI classifier speeds up, by reading your description against the structure and returning a code with a short reason. Whichever route you take, the four steps above are the same.
Frequently asked questions
How do I find the HS code for my product?
Describe what the product does and what it is made of, find the chapter that covers that kind of good, then use the section and chapter notes to narrow to the six-digit heading and subheading. Finally, confirm the full national code, which in the US is the 10-digit HTS line that carries the duty rate. Working function-first, not name-first, is what keeps the code correct.
Can I look up an HS code by product description?
Yes. A modern classifier takes a plain-English description and returns the matching HS or HTS code, ideally with a rationale you can check. Keyword lookups in a tariff database also work, but they put the interpretation on you, so they are more error-prone for products that could fit several headings. Either way, verify the result against the chapter notes before filing.
Are HS codes the same in every country?
The first six digits are the same worldwide, because the Harmonized System is an international standard maintained by the World Customs Organization. Beyond six digits, each country adds its own digits and duty rates, so the US 10-digit HTS code and the equivalent code in another market share a root but diverge at the end. Always use the destination country's full national code for duty.
What happens if I use the wrong HS code?
A wrong code means you pay the wrong duty. Underpay and you can face back duty, interest and penalties on every affected entry; overpay and you quietly lose money on every shipment. Because customs can review entries years later, an incorrect classification is a liability that compounds, which is why a defensible, documented code matters more than a fast guess.
Once you have the code, turn it into money with the import duty calculator and the landed cost calculator, or compare the tools that automate this in our roundup of the best HS code classification software.