HS Code vs HTS Code: The Difference for US Imports

The Harmonized Commodity Description and Coding System — universally called the Harmonized System or HS — is an international nomenclature developed and maintained by the World Customs Organization (WCO). More than 200 countries and territories use it as the foundation for their customs tariff schedules, export statistics, and trade data collection. The system organizes goods into 21 sections, 97 chapters, and thousands of headings and subheadings based on the nature of the product, its material composition, and its primary function.

The internationally standardized portion of the HS is the six-digit code. The first two digits represent the chapter, the next two represent the heading within that chapter, and the final two represent the subheading within the heading. For example, chapter 85 covers electrical machinery and equipment. Within chapter 85, heading 8517 covers telephone sets including smartphones. Subheading 851712 identifies smartphones specifically. This six-digit subheading is the same in every country that uses the HS — a smartphone classified as 8517.12 in China, the EU, and the United States is pointing to the same international subheading.

The WCO reviews and updates the HS every five years in what are called revision cycles. The most recent edition entered into force in 2022 (HS 2022), with HS 2027 in preparation. Each revision reorganizes some chapters, splits certain subheadings, and creates new ones to reflect changes in technology, trade patterns, and international priorities. When a revision occurs, code numbers can change, and a tariff database built on HS 2017 codes may not map correctly to HS 2022 codes for the same product.

The United States Harmonized Tariff Schedule (HTS or HTSUS) is the official US tariff nomenclature maintained by the US International Trade Commission (USITC). It starts with the six-digit HS foundation and extends it to 8, 10, and in some cases additional digits that are specific to the United States. The 8-digit level is the basic US statistical breakout — the point at which US-specific distinctions appear. The 10-digit level is used for filing and duty-rate determination at import.

The US HTS includes columns for MFN (Column 1 General) duty rates, special program rates (such as FTA preferences listed in the Special column), and Column 2 rates (which apply to a very small number of non-NTR countries). For most importers from most countries, the Column 1 General rate is the applicable base rate. For China-origin goods, trade actions layer additional rates on top of that base in a way that is tracked outside the standard tariff columns.

The USITC publishes the HTS online at hts.usitc.gov and updates it throughout the year through presidential proclamations, CBP rulings, and USITC recommendations. Because the HTS changes more frequently than the underlying HS revision cycle, a code that was accurate six months ago may have been modified, renumbered, or have an attached annotation that changes its duty treatment. For recurring import programs, it is worth checking the current HTS publication at the time each new purchase order is issued rather than assuming the code is static.

A product keyword match can help start research, but the final code depends on material, function, construction, and legal notes in the tariff schedule. Two products that look identical from a commercial description standpoint — a 'Bluetooth speaker' for instance — can be classified differently depending on whether the product's primary function is treated as a portable audio device, a telecommunications terminal, or a data processing peripheral. Each classification leads to a different HTS subheading, a different duty rate, and potentially different trade-action exposure.

The duty rate assigned at the 10-digit HTS level can differ substantially from what might be inferred from the 6-digit HS subheading. The HS 6-digit code tells you the international category; the US 10-digit HTS tells you the specific US duty rate, the applicable trade program eligibilities, and any special annotations. Using only an HS code in a duty estimate for US imports is equivalent to knowing which section of a library a book is in without knowing the book's actual contents.

For trade-action exposure — Section 301, antidumping, or countervailing duties — the determination is made at the HTS code level. An antidumping order that covers HTS 7216.50.0090 does not automatically cover 7216.50.0091 even though both share the same parent heading. This is why looking up the correct 10-digit code rather than the 6-digit heading is the prerequisite for any meaningful duty estimate for US imports.

Start with a product description search to generate candidate HS and HTS subheadings. Keyword search tools help narrow the range of possibilities, but treat the results as candidate codes that require validation, not as confirmed classifications. The starting keyword list should include the product's primary material, its principal function, how it is sold or packaged, and whether it contains components (batteries, motors, sensors) that could affect classification.

Once you have a shortlist of candidate 6-digit HS subheadings, cross-reference them against the current USITC HTS to find the US-specific 10-digit code. Review the chapter notes, section notes, and any relevant explanatory notes for the heading to confirm that your product falls within the legal scope of the subheading. US CBP binding ruling databases can also show how similar products have been classified in past rulings — these are not binding on your entry but are useful evidence of how CBP approaches the product type.

Save the chosen code, source note, date, origin, customs value, freight, and insurance together so the estimate can be reviewed later. Classification work is perishable — the product may change, the tariff schedule may change, or the trade-action environment may change. A dated record of the classification decision and the inputs used makes future re-validation much faster and provides documentation that supports any audit or broker review.

For products with genuinely ambiguous classification — products made of multiple materials, products with multiple functions, products that straddle two chapters, or products that are new to market and lack prior rulings — a binding ruling from US Customs and Border Protection (CBP) provides certainty. A binding ruling is a written decision from CBP that states how a specific product will be classified when it enters the United States. It is binding on CBP for the product described and provides protection against reclassification at entry.

A binding ruling request requires a detailed product description, samples in some cases, the technical specifications, and the requested HTS classification. The process takes several months and is most appropriate for high-volume, recurring import programs where the duty rate difference between two plausible classifications represents significant annual cost. For one-off or low-volume shipments, the standard broker review process is more proportionate.

For most importers doing quote planning rather than formal entry filing, the practical goal is to identify the most defensible candidate code for estimation purposes, flag the uncertainty level, and build the process to have a licensed broker confirm the code before the shipment arrives. The broker review is not redundant with a lookup tool — it is the step that converts a candidate code into a filed entry, and experienced brokers add value in interpreting chapter notes, identifying prior rulings, and catching classification errors before they create liability at the port.