HS Code vs HTS Code vs Schedule B: What U.S. Shippers Need to Know

HS code, HTS code and Schedule B number are often used as if they mean the same thing. They are related classification systems, but U.S. importers and exporters use them for different purposes.

The simplest distinction is: HS is the international foundation, HTS is the U.S. import system, and Schedule B is the U.S. export classification system.

What an HS code is

The Harmonized System (HS) is the international product-nomenclature structure administered by the World Customs Organization. Countries use the same basic 4- and 6-digit product categories, then extend them with national tariff or statistical subdivisions.

That common six-digit foundation is why a product can appear to have the “same code” across countries at a broad level while the complete national code differs.

What an HTS code is

The Harmonized Tariff Schedule of the United States (HTS or HTSUS) is the U.S. import tariff schedule maintained by the U.S. International Trade Commission. The USITC explains that the international 4- and 6-digit HS categories are subdivided into 8-digit U.S. tariff-rate lines and 10-digit statistical reporting categories.

The HTS is used to classify merchandise imported into the United States and to determine applicable tariff treatment, subject to origin, trade programs and other rules.

What a Schedule B number is

Schedule B is administered by the U.S. Census Bureau and is used for U.S. export reporting. Like the HTS, it is based on the Harmonized System, but the U.S. export statistical structure does not always match the U.S. import structure at the 8- and 10-digit level.

The USITC specifically notes that the first six digits of Schedule B and HTS numbers are the same because both derive from HS, while later U.S. statistical digits can differ.

System	Primary U.S. use	Typical depth	Maintained by
HS	International classification foundation	6 digits internationally harmonized	World Customs Organization
HTS/HTSUS	U.S. imports	8-digit tariff lines, 10-digit statistical reporting	USITC
Schedule B	U.S. exports	10-digit export reporting numbers	U.S. Census Bureau

Why a 10-digit HTS code may not equal a Schedule B number

At six digits, both systems usually point to the same international product family. After that, the United States collects different statistical detail for imports and exports. USITC notes that there are more detailed 10-digit HTS import numbers than Schedule B export numbers, so multiple import classifications can correspond to a smaller number of export classifications.

Example: one product moving both directions

A U.S. company imports a machine component, modifies it and later exports it. The import entry needs the appropriate HTS classification. The export filing is based on Schedule B requirements. The first six digits may align, but the company should not blindly copy a 10-digit import code into its export system.

2026 classifications can change during the year

Classification is not a one-time spreadsheet exercise. The USITC published multiple 2026 HTS revisions, including Revision 20 dated September 28, 2026. Tariff provisions, statistical breakouts and additional-duty rules can change, so importers should verify the current HTS rather than relying on a prior-year code list.

The Census Bureau also publishes current Schedule B and AES classification updates for export reporting.

How to classify a product more reliably

1. Describe the product precisely. Include material, function, composition, form and principal use.
2. Start with the legal structure. Review the relevant headings, section notes and chapter notes rather than using keyword search alone.
3. Work from broad to specific. Identify the correct 4-digit heading before moving into subordinate categories.
4. Use the correct national system. HTS for U.S. imports; Schedule B for export reporting as applicable.
5. Document the reasoning. Keep specifications, rulings and classification notes with the SKU record.
6. Revalidate when the product changes. A material, function or construction change can change classification.

Why classification matters for landed cost

The HTS classification can affect duty rate and additional tariff treatment. An incorrect code can therefore make a landed-cost model look artificially cheap or expensive.

Pair classification work with the Import Duties, Taxes and Disbursement Fees guide and Freight Cost Allocation Calculator when building SKU economics.

Common classification mistakes

• Choosing the first search result that “sounds right.”
• Copying a supplier’s code without checking U.S. rules.
• Using a Schedule B number on an import entry.
• Assuming the full code is identical in every country.
• Failing to update codes when the HTS changes.
• Using a code without enough product-detail documentation to support it.

Frequently asked questions

Are HS and HTS the same thing?

No. HS is the international foundation; HTSUS is the U.S. tariff schedule built on that foundation for imports.

Can I use an HTS code for a U.S. export?

U.S. export reporting is based on Schedule B. The USITC notes that some HTS numbers can be reported for exports where permitted, but exporters must follow Census/AES requirements and use Schedule B where required.

Who decides the final classification?

Importers and exporters are responsible for accurate reporting. Customs brokers and classification specialists can assist, and formal rulings may be appropriate for difficult products.

Sources

• USITC: About the Harmonized Tariff Schedule
• USITC: Schedule B vs HTS numbers
• USITC: HTS and export classification
• U.S. Census Bureau: International Trade Reference