If you are importing or exporting goods internationally, two things determine how much you pay at the border: your HS code and the tariff rate attached to it. Most importers focus on the tariff — the percentage — without fully understanding that the code is what triggers it. Get the code wrong and you may be paying the wrong rate, under-declaring your duties, or exposing your company to a customs audit that surfaces years after the shipment cleared.

This page explains what HS codes are, how they connect to your tariff liability, and why getting them right matters more right now than it ever has.

What is an HS Code?

HS stands for Harmonized System. It is a standardized numerical classification system maintained by the World Customs Organization — the WCO — that covers every product traded internationally. There are tens of thousands of goods on that list, and every single one has a six-digit code that identifies exactly what it is.

Those six digits are universal. Whether your cargo is clearing customs in Houston, Rotterdam, or Singapore, the first six digits of the HS code mean the same thing to every customs authority in the world. Countries then add additional digits — the United States uses a ten-digit version called the HTS code, the Harmonized Tariff Schedule — to create more specific classifications for their own tariff schedules.

The code does two things simultaneously: it tells customs what is in your shipment, and it triggers the tariff rate that applies to that product. Same product, wrong code — different rate, potential liability.

How Your HS Code Determines Your Tariff

Every HS code carries a tariff rate — a percentage applied to the declared value of your goods at the time of import. Under normal circumstances that rate is published and predictable. The problem is that circumstances have not been normal.

Section 301 tariffs, applied to goods from China, are layered on top of standard rates for thousands of product categories. A product with a standard 5% duty rate may carry an additional 25% Section 301 tariff, depending on its HS code and country of origin. The difference between two closely related codes can be the difference between a 5% rate and a 30% rate on the same type of product.

This is not theoretical. We have clients who have had to hire attorneys and fight tariff classifications after the fact. The disputes are expensive, time-consuming, and not always resolved in the importer's favor. The better investment is getting the classification right before the shipment moves.

Who Actually Pays the Tariff?

This is one of the most misunderstood aspects of trade policy. Tariffs are not paid by the exporting country. They are not paid by the foreign manufacturer. They are paid by the importer of record — the U.S. company or individual who brings the goods into the country.

No other party can pay them. A customs broker can file and remit payment on your behalf, but the legal and financial obligation rests entirely with the importer of record. When tariffs go up, the cost lands on American importers — and through them, on American businesses and consumers.

How Texas Global Services Handles HS Code Research

HS code classification is not guesswork — but it requires expertise. The WCO schedule contains thousands of headings and subheadings, and many products could plausibly fall under more than one classification. The correct code is determined by the product's composition, function, and intended use — and in some cases, the distinction between two codes comes down to technical specifications that require industry knowledge to apply correctly.

We research HS codes for our clients' cargo as part of our service. That research covers:

A Note on the Current Tariff Environment

Tariff rates have changed more frequently in the past several years than at any point in recent memory. Section 301 rates have been modified, exclusions have been granted and expired, and new product categories have been added to tariff lists with limited notice. For Houston importers — particularly those moving industrial equipment, oilfield components, manufactured goods, and raw materials — staying current on applicable rates is an ongoing responsibility, not a one-time task.

The infrastructure that supports international trade — the freight forwarders, customs brokers, and logistics providers who handle this complexity daily — has contracted significantly under this pressure. Companies have closed. Experienced staff have left the industry. The practical consequence is that the knowledge required to navigate this environment correctly is less available than it was five years ago.

Getting your HS codes right, working with a licensed customs broker, and reviewing your classifications regularly is not overcaution. It is basic protection for your business in an environment where the rules are changing and the consequences of errors are real.