HS, HTS, Schedule B, and NAICS: How to Classify Products and Buyers

Who this explainer is for

This explainer is for manufacturers, exporters, and B2B research teams using public trade and business data to assess a U.S. or North American market. It is educational and does not determine a tariff classification for a shipment.

Contents

1 The four systems in one view 2 How the product-code hierarchy works 3 Why NAICS is different 4 Use the SellersGPT Two-Axis Classification Record 5 Classification workflow for market research 6 Illustrative example 7 Common mistakes 8 What this explainer does not mean 9 Common questions 10 Sources and methodology

1. The four systems in one view

System What it classifies Primary U.S. use Maintained or published by HS Goods in international trade International foundation through six digits World Customs Organization; implemented nationally HTS / HTSUS Goods imported into the United States Tariff and statistical classification for U.S. imports U.S. International Trade Commission; administered at entry by CBP Schedule B Goods exported from the United States U.S. export statistical reporting U.S. Census Bureau NAICS Business establishments by primary economic activity U.S. business statistics and industry analysis U.S. statistical agencies under OMB framework, developed with Canada and Mexico HS - international product foundation Official fact: The Harmonized System uses a two-digit chapter, four-digit heading, and six-digit subheading. It is the international foundation on which national tariff and statistical codes are built. USITC

- Section 1205 and the Harmonized System HTS - U.S. imports The Harmonized Tariff Schedule of the United States describes imported goods for tariff, quota, and statistical purposes. Official fact: The HTS is based on the international HS. Its four- and six-digit provisions are international; U.S. eight-digit rate lines and ten-digit statistical reporting categories add national detail. USITC publishes and maintains the schedule, while U.S. Customs and Border Protection interprets and enforces it at import. USITC - About the HTS Schedule B - U.S. exports Schedule B is the U.S. statistical classification used for exports. Official fact: The U.S. Census Bureau's Schedule B resource provides current browse, search, download, concordance, and obsolete-code materials. U.S. Census Bureau - Schedule B NAICS - business establishments NAICS groups establishments according to economic activity. It does not classify a shipment or assign a tariff. Official fact: The Census Bureau describes NAICS as the standard used by federal statistical agencies to classify business establishments for collecting, analyzing, and publishing U.S. business-economy data. U.S. Census Bureau - NAICS

2. How the product-code hierarchy works

Consider a ten-digit U.S. import reporting number as a hierarchy, not a label to be guessed from a keyword:

• digits 1-2: HS chapter;

• digits 1-4: HS heading;

• digits 1-6: HS subheading;

• digits 1-8: U.S. HTS rate line;

• digits 1-10: U.S. statistical reporting category. Official fact: USITC states that the legal text of the U.S. HTS ends at the eight-digit level where rates are assigned; ten-digit categories serve statistical reporting. USITC - HTS Frequently Asked Questions National digits after the common six-digit HS level may differ. A code supplied by a foreign factory may therefore be valid in the exporting country but not the correct U.S. HTS code. HTS and Schedule B are related but not interchangeable Their first six digits align for HS chapters 1 through 97, but U.S. import and export detail can diverge beyond six digits. Official fact: Census explains that most U.S. export transactions can use a qualifying HTS number, but some export situations require Schedule B detail, and Schedule B numbers cannot be reported on import entries. U.S. Census Bureau - Exporting With Import Classification Numbers For market research, state whether the dataset is using HTS, Schedule B, HS, or a concorded series. For operations, use the current rules for the actual direction and transaction.

3. Why NAICS is different

A product may be purchased by establishments in many NAICS industries. One establishment may buy many product classes. There is no automatic one-to-one mapping. For example, a pump can appear in product trade statistics, while likely buyers may include food processors, chemical plants, equipment OEMs, contractors, and distributors. The pump's HTS code does not tell you which relationship applies. A food-manufacturing NAICS code does not prove every establishment uses that pump. SellersGPT recommendation: Build two axes: 1 Product axis: what goods are included in the trade flow? 2 Buyer axis: which establishments, applications, and buying relationships could create relevant demand? Connect the axes with account and application evidence, not an assumed code crosswalk.

4. Use the SellersGPT Two-Axis Classification Record

Product record Field Record Commercial product name Name used by the business Technical description Function, material, construction, operating principle, condition, and intended use Direction U.S. import, U.S. export, or other-country flow Classification system HS, HTS, Schedule B, or national tariff schedule Code and level Exact code and digit level Official description Verbatim short description within quotation limits Notes reviewed Relevant section, chapter, heading, and statistical notes Version and effective date Schedule vintage used Alternatives considered Similar codes and why excluded Decision source Internal specialist, broker, ruling, official search, or adviser Research limitation Breadth, mixed products, code changes, or uncertainty Buyer record Field Record Establishment activity What the facility primarily does NAICS version Current code edition used NAICS code and level Sector through national industry Application evidence Why the establishment could use the product Relationship type OEM, distributor, end user, or contractor Facility vs parent Which level is being counted Inclusion and exclusion Written ICP rules Verification status Included, excluded, or research needed This record makes later updates reproducible and prevents a change in code from silently changing the market definition.

5. Classification workflow for market research

Step 1 - describe the product before searching Collect technical drawings, materials, principal function, components, method of operation, condition at import, packaging, and intended use. Do not begin with the marketing name alone. Step 2 - search the current official schedule Use the current USITC HTS Search for U.S. imports and the current Census Schedule B for U.S. exports. Read the hierarchy and relevant notes. Step 3 - confirm the purpose Separate three tasks:

• compliance classification for a transaction;

• statistical classification for a market-data query;

• broader product grouping for a commercial analysis. A broader group can be valid for screening if its limitations are disclosed. It is not automatically valid for customs entry. Step 4 - obtain qualified guidance when material Official fact: CBP's Binding Ruling Program lets importers and other interested parties request pre-entry classification and other decisions for a described prospective import transaction. U.S. Customs and Border Protection - Binding Ruling Program Step 5 - identify candidate buyer industries separately Search NAICS descriptions, examine facilities, applications, and value-chain relationships, and validate real accounts. Include distributors and contractors only when they fit the chosen relationship hypothesis. Step 6 - preserve the version HS and national codes change. When building a multi-year series, review concordances, obsolete codes, and DataWeb warnings so a classification change is not mistaken for market growth or decline.

6. Illustrative example

Illustrative example. No tariff or industry code is assigned here because classification depends on exact facts. This is not customs advice. A sanitary pump manufacturer wants to research U.S. food-processing demand. 1 It prepares a technical product description rather than searching only "sanitary pump." 2 A qualified owner identifies the relevant current U.S. import classifications and records alternatives and notes. 3 The research team queries product flows at the narrowest defensible level and flags mixed products. 4 Separately, it identifies food-manufacturing NAICS industries and facility clusters. 5 It validates which facilities operate relevant liquid processes and whether purchases occur through end users, OEMs, distributors, or contractors. The result is not "the HTS market equals the NAICS market." It is a product-flow view connected to a verified account-and-application view.

7. Common mistakes

• Using a supplier's foreign ten-digit code for U.S. imports: only the first six digits are generally harmonized.

• Searching by product name and selecting the first result: classification depends on the schedule hierarchy and product facts.

• Using Schedule B on an import entry: Schedule B is the U.S. export system.

• Assuming every HTS code is valid for export reporting: some cases require Schedule B detail.

• Treating NAICS as a product code: NAICS classifies establishments.

• Treating a product-to-industry concordance as a buyer list: statistical relationships do not prove application or purchase.

• Ignoring code changes across years: discontinuities can create false trends.

• Presenting a research code as customs advice: keep research scope and transaction responsibility separate.

8. What this explainer does not mean

• It does not classify a specific product or determine duty, origin, admissibility, marking, remedy, or reporting obligations.

• It does not replace CBP, a customs broker, trade counsel, or another qualified specialist.

• It does not guarantee that an official keyword search returns the correct code.

• It does not say all national tariff codes match after six digits.

• It does not convert NAICS counts into qualified accounts.

9. Common questions

Is an HS code the same worldwide? The international HS foundation is harmonized through six digits. Countries can add national detail and set their own tariff treatment beyond that level. Which code should I use for U.S. import data? Use the U.S. HTS classification and record the version, code level, flow, measure, partner, and period. For a customs transaction, verify the classification for the exact goods. Which code should I use for U.S. exports? Use Schedule B unless current rules permit the applicable HTS number for that export. Confirm with current Census guidance. Can NAICS show which companies buy my product? No. It can identify establishment activities and support geographic or industry screening. You still need application, relationship, facility, and account evidence.

10. Sources and methodology

Sources 1 USITC - About the Harmonized Tariff Schedule. Used for HTS purpose, hierarchy, national detail, publication, and administration. Accessed August 24, 2026. 2 USITC - Section 1205 and the Harmonized System. Used for the two-, four-, and six-digit international HS hierarchy. Accessed August 24, 2026. 3 USITC - HTS Frequently Asked Questions. Used for digit levels, international versus U.S. provisions, and classification guidance. Accessed August 24, 2026. 4 USITC - HTS Search. Used as the current official U.S. tariff-schedule access point. Accessed August 24, 2026. 5 U.S. Census Bureau - Schedule B. Used for current U.S. export classification resources and code vintages. Accessed August 24, 2026. 6 U.S. Census Bureau - Exporting With Import Classification Numbers. Used for the permitted and excluded use of HTS numbers in U.S. export reporting. Accessed August 24, 2026. 7 U.S. Census Bureau - International Trade Definitions. Used for the official descriptions of HS, HTS, and trade-statistical concepts. Accessed August 24, 2026. 8 U.S. Census Bureau - NAICS. Used for the official purpose and North American development of NAICS. Accessed August 24, 2026. 9 U.S. Customs and Border Protection - Binding Ruling Program. Used for the availability and scope of pre-entry binding rulings. Accessed August 24, 2026. 10 USITC - DataWeb. Used for official U.S. merchandise trade query and classification resources. Accessed August 24, 2026. SellersGPT framework The Two-Axis Classification Record and six-step market-research workflow are original SellersGPT editorial tools. They organize evidence but do not determine a legal customs classification. Evidence labels

• Official fact: directly supported by a named official source.

• Calculated from official data: derived from disclosed data and method.

• SellersGPT recommendation: an editorial framework or interpretation. Update policy Review at least annually and whenever HS, HTS, Schedule B, NAICS, product design, direction of trade, or the market-data period changes. Keep prior code versions with the research record.