HTS Codes Explained: Classification, Duty Rates & Common Mistakes

What Is an HTS Code?

The Harmonized Tariff Schedule (HTS) is a 10-digit classification system used by U.S. Customs to categorize every product that crosses the border. Your HTS code determines your duty rate, whether you're subject to antidumping or countervailing duty orders, whether your product requires special permits, and how your entry is reviewed by CBP.

The HTS is based on the international Harmonized System (HS), which is used by over 200 countries. The first six digits are universal. The last four digits are U.S.-specific and determine statistical suffixes, which sometimes affect duty rates and import requirements.

How the Code Is Structured

Digits	What They Represent	Example
Digits 1–2	Chapter (broad product category)	76 = Aluminum
Digits 3–4	Heading (specific product type)	7604 = Aluminum bars, rods, profiles
Digits 5–6	Subheading (international level)	7604.10 = Of aluminum, not alloyed
Digits 7–8	U.S. tariff rate line	7604.10.10 = Specific form
Digits 9–10	U.S. statistical suffix	7604.10.1000 = Full 10-digit

Where to Look It Up

The official U.S. HTS is published and searchable at hts.usitc.gov. Type in a keyword or navigate by chapter. The CBP CROSS database at cbp.gov/trade/rulings contains binding classification rulings — these are the most authoritative sources on how CBP classifies specific products.

Why It Matters So Much

Duty rate: Your HTS code is the direct input to your duty calculation. A one-digit difference can mean a 20-point swing in your effective rate.
Section 301 applicability: The Section 301 tariff lists are defined by HTS codes. Whether your product is subject to 7.5%, 25%, or 0% Section 301 tariff depends entirely on your classification.
ADD/CVD exposure: Antidumping and countervailing duty orders are defined by HTS subheadings. The wrong code can expose you to (or shield you from) orders that carry 50–300% additional duties.
Import requirements: Some HTS codes trigger FDA review, USDA permits, EPA certifications, or other agency requirements. Your code tells CBP which agencies to loop in.

Common Classification Errors

Using a generic chapter instead of a specific subheading

Filing "plastic articles" (3926.90.9990 — a catch-all) when the product should be classified more specifically. The specific heading usually carries a lower rate — or sometimes higher. Either way, it's wrong.

Classifying by material instead of function

HTS classification follows the General Rules of Interpretation (GRI). For many products, the classification is driven by the product's primary function — not what it's made of. A steel bracket used in electronics may classify under Chapter 85, not Chapter 73.

Using the same code for finished goods vs. components

A finished garment and a textile cut panel classify differently. A complete machine and its spare parts classify differently. Brokers handling high volume sometimes use generic codes across a product line instead of classifying each item specifically.

Ignoring principal use or chief value rules

Some HTS chapters use principal use or chief value to determine classification. If 60% of a product's value is aluminum but it's being used as a medical device component, classification may follow use, not material.

How to Verify Your Code

Look up your code in the USITC schedule — does the description match your actual product in all relevant characteristics?
Search the CBP CROSS database for rulings on similar products. Binding rulings are CBP's official position on classification.
Request a binding ruling — if you have significant volume and aren't certain, you can request a binding ruling from CBP before importing. Takes 30 days and is legally binding.
Get a second opinion from a licensed broker — HTS classification is an art and a science. If your current broker classified your product without documentation or discussion, ask them to show their work.

We offer free HTS review as part of onboarding. We don't just accept whatever code your previous broker used — we classify from scratch, check CBP rulings, and document our rationale so you have a defensible reasonable care record.

Get a Free HTS Review

In This Guide

What is an HTS Code? Code Structure Why It Matters Common Errors How to Verify Yours

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HTS Codes Explained