An HTS code is the classification number the United States assigns to an imported product. HTS stands for Harmonized Tariff Schedule. It is the US version of a global system: the first six digits are the same in every participating country, and the US adds four more digits of its own.
The number is not a formality. It sets the duty rate, decides whether additional tariffs apply, and determines whether another agency has a say in whether the goods can enter.
How the Number Is Built
An HTS code runs to ten digits, in four parts:
| Digits | Name | What it does |
|---|---|---|
| 1–2 | Chapter | Broad product family, e.g. 84 machinery, 85 electrical |
| 3–4 | Heading | A product group within the chapter |
| 5–6 | Subheading | The internationally agreed description |
| 7–8 | US subheading | US-specific split |
| 9–10 | Statistical suffix | Statistical reporting detail |
The first six digits are international. That is why a Chinese exporter and a US importer often quote the same six-digit code and still land on different ten-digit numbers.
Duty rates live at eight digits. The last two are for statistics.
Why It Decides More Than the Duty
Three things follow from the classification:
The duty rate. This is the obvious one. Two codes that sound similar can sit at very different rates.
Whether additional tariffs apply. Various tariff actions are attached to specific code ranges. The code decides whether the product is in scope.
Whether another agency is involved. Some codes trigger a requirement for another agency’s review before release. A code change can therefore change the process, not just the price.
Classification Is Not a Guess
The classification process is governed by rules, not by what a product is called. The General Rules of Interpretation set the method, and the method is:
- Read the heading text.
- If two headings could apply, apply the more specific one.
- If the product is a set or a mixture, use the rule for that case.
- If the product is a part, decide whether it is a part of the whole or a good in its own right.
That last one is where most disputes live. A cold plate for a server is physically a component of a computer. Customs may still classify it by what it does, which is exchange heat.
The name in the catalogue is not the classification. Neither is the material, on its own.
Six Digits, Ten Digits, and What You Actually Need
| Stage | Digits needed | Why |
|---|---|---|
| ISF filing | Six | CBP accepts six at this stage |
| Entry summary | Ten | Duty is assessed here |
| Chinese export declaration | Chinese code | Different system, different number |
That last row is a common and expensive confusion. China’s export code and the US import code are not the same number. They often align at six digits and diverge after.
What Happens When It’s Wrong
Too high. You pay more duty than required, permanently. CBP will not send a refund for an overpayment you filed yourself.
Too low. Duty is assessed short. CBP can recover it later, with interest, and assess penalties. Repeated errors affect your importer record.
Wrong in a way that changes scope. If the correct code carries an additional tariff the wrong code did not, the difference is recovered retroactively.
Wrong in a way that changes agency involvement. Goods released without a required agency review can be recalled, and the goods are already in the country.
Getting It Settled
For products where the classification is genuinely unclear, there is a formal route: a binding ruling from CBP. You submit the product details and CBP issues a classification that binds the agency for that product, for that importer.
It takes time. It is also the only way to be certain before the goods arrive.
For everything else, the practical approach is to classify from the product itself: what it is, what it is made of, what it does, and how it is presented for sale. Then put that reasoning in writing so it can be checked.
Related Entries
Key Facts
- HTS = Harmonized Tariff Schedule, ten digits in the US.
- The first six digits are international, the rest is US-specific.
- Duty rates sit at eight digits; the last two are statistical.
- China’s export code and the US import code are different numbers.
- Addressed by the General Rules of Interpretation, not by product name.
- For genuinely unclear cases, a CBP binding ruling is the formal answer.