Every product that crosses the US border needs an HTS (Harmonized Tariff Schedule) code. It's a 10-digit number that tells customs what your product is, what duty rate applies, and whether it needs a license before it can be imported. Get it wrong, and the consequences range from overpaying duties to customs holds to penalties for misclassification.
If you're new to exporting, or you're classifying a product line for the first time, here's what actually matters — and a free tool at the bottom of this page to look up any code in seconds.
What an HTS Code Actually Tells You
The code itself is built in layers. The first six digits are the international Harmonized System (HS) number, shared globally. The US adds four more digits on top for its own tariff schedule, which is where the actual duty rate and any special program eligibility show up. Two products that look identical on the surface — say, a cotton shirt versus a cotton-poly blend shirt — can carry meaningfully different duty rates because the fiber content changes the classification entirely.
The Most Common Classification Mistakes
- Classifying by name, not composition. "Copper wire" and "insulated copper wire for electrical use" can land in different chapters of the schedule entirely. Customs cares about material and function, not what you call the product on your invoice.
- Copying a supplier's or competitor's code. A code that's correct for one company's version of a product isn't automatically correct for yours — small differences in materials or use can change the classification.
- Missing special trade program rates. Programs like USMCA can lower or eliminate duty on qualifying goods, but only if you flag eligibility explicitly — it's not applied automatically.
- Not re-checking after schedule updates. The tariff schedule gets revised periodically, including recent additions tied to trade actions on steel, aluminum, and other materials. A code that was correct last year may carry a different rate today.
Misclassification is one of the most common reasons US Customs flags a shipment for review — and it's almost entirely avoidable with a quick lookup before you file.
How to Classify a Product, Step by Step
- Identify what the product is made of and what it's used for — not just what it's called commercially.
- Search the tariff schedule by keyword to find candidate chapters and headings.
- Compare the full product description text under each candidate code — the details matter more than the summary.
- Check the general, special, and "other" (column 2) duty rates listed for that code.
- When in doubt on a high-value or recurring product, consider requesting a binding ruling from CBP so you have it in writing.
From Lookup to Paperwork, Automatically
Looking up a code is only half the job — the same code then has to appear correctly on your commercial invoice, shipper's letter of instruction, and certificate of origin, every time, with no typos or version drift between documents. That's where our documentation portal comes in: codes you save get pulled automatically into every document that needs them.
Create a free account to start building your product library, or see our full freight and compliance services.