United Exports

What Is an HS Code?

An HS code is a standardized number that customs authorities worldwide use to identify what you are shipping, and it determines duty rates, paperwork and whether any restrictions apply.

At a glance

HS stands for Harmonized System, an international product classification maintained by the World Customs Organization.
The first six digits are the same in every participating country; countries add digits for their own tariff and statistical needs.
U.S. exports are reported using Schedule B codes; imports use HTS codes. Both build on the same six-digit HS root.
Classification determines duty, documentation and eligibility for trade-agreement treatment — so an incorrect code is a real financial and compliance risk.

How the number is structured

Read an HS code from left to right, moving from broad to specific. Each pair of digits narrows the description.

First 2 digits: Chapter — the broad product family, such as machinery or edible vegetables.
Digits 3–4: Heading — the product group within that chapter.
Digits 5–6: Subheading — the internationally harmonized product description.
Digits 7–10: National detail — added by each country. In the U.S., Schedule B for exports and HTS for imports.

Six digits are globally consistent; anything beyond six is country-specific, so a buyer's code and your code can legitimately differ after the sixth digit.

Why classification matters commercially

It sets the duty rate your buyer pays on arrival, which affects your landed price and your competitiveness.
It determines whether the shipment qualifies for reduced duty under a trade agreement.
It drives which documents customs will expect, including certificates of origin.
It is used to flag products subject to controls, quotas or destination-specific restrictions.
It feeds official trade statistics, which is how markets for your product category become visible in the first place.

How to work toward the right code

1
Describe the product precisely
Write down what it is made of, what it does, how it is processed, and how it is packaged for sale. Classification usually turns on material composition and function, not on your marketing name for the product.
2
Find the chapter first
Identify the broad family before hunting for a specific line. Working top-down avoids the common trap of matching a keyword in the wrong chapter.
3
Compare candidate subheadings
When two lines seem plausible, look at what distinguishes them — degree of processing, material, intended use — and document why you chose one over the other.
4
Verify before you ship
Confirm the code with a licensed customs broker, or use the official U.S. classification tools and rulings, and keep a written record of the basis for your choice.

Where to verify officially

United Exports provides educational guidance only. Any code produced by a tool — including tools on this platform — is a suggestion, not a determination.

The U.S. Census Bureau publishes the Schedule B classification used for exports and a search tool for it.
The U.S. International Trade Commission publishes the Harmonized Tariff Schedule used for imports into the United States.
U.S. Customs and Border Protection publishes binding ruling procedures when a classification needs official certainty.
A licensed customs broker can classify on your behalf and is the appropriate professional for borderline cases.

Educational guidance, not an official determination

Classification is a legal determination. Educational guidance on this page, and any code suggested elsewhere on United Exports, is labeled “Suggested” and must be confirmed with a licensed customs broker or through official U.S. government classification resources before you ship.

Continue learning

Exporting Made SimpleIncludes the classification step in context with the rest of the export process.Export Documents ExplainedWhere the HS code appears on the commercial invoice and other paperwork.Do I Need an Export License?How classification connects to controls and licensing questions.