HTS vs Schedule B Codes: What Every Importer Needs to Know

Two Code Systems, One Harmonized Foundation

The United States uses two distinct 10-digit tariff code systems: the Harmonized Tariff Schedule (HTS) for imports and the Schedule B for exports. Both are built on the same international foundation — the World Customs Organization's Harmonized System (HS) — which means the first six digits are identical for the same product. The divergence happens at digits 7 through 10, where each system serves its own purpose.

HTS Codes: The Import Side

The HTSUS is maintained by the US International Trade Commission and enforced by CBP. Its 10-digit codes determine the applicable duty rate, eligibility for preferential trade programs (like USMCA or GSP), and any additional regulatory requirements. The last four digits (7-10) are designed to capture duty-rate distinctions and statistical data relevant to imports. There are approximately 18,927 10-digit HTS codes currently in effect.

Schedule B Codes: The Export Side

Schedule B is maintained by the US Census Bureau and is used exclusively for reporting exports from the United States. While Schedule B codes are also 10 digits, the last four digits serve statistical purposes for export tracking — they do not determine duty rates (since exports are generally duty-free from the US side). The Census Bureau uses this data to compile trade statistics, and exporters are legally required to report Schedule B codes on their Electronic Export Information (EEI) filings via the Automated Export System (AES).

Where They Overlap and Where They Diverge

• Digits 1-6: Identical for the same product in both systems (HS-based).
• Digits 7-8: Often identical, but not always — there are cases where HTS and Schedule B diverge at the 8-digit level.
• Digits 9-10: Frequently different. HTS uses these for duty rate granularity; Schedule B uses them for statistical reporting.
• Total codes: HTS has approximately 18,927 codes vs Schedule B's approximately 8,958 codes — HTS is more granular because it needs to capture more duty-rate distinctions.

Common Confusion Points

The most common mistake is using a Schedule B code on an import entry or an HTS code on an export filing. Since the first six digits match, the error may not be immediately obvious — but it can result in incorrect duty calculations, denied trade preference claims, or rejected export filings. Another frequent issue is assuming that because a product has the same 6-digit HS code in both systems, the full 10-digit code is interchangeable. It is not.

When to Use Which Code

• Importing into the US: Always use the HTS code. This is what appears on your customs entry (CBP Form 7501).
• Exporting from the US: Always use the Schedule B code. This is what you report on your EEI filing in AES.
• Foreign trade zones (FTZ): Use HTS codes for goods entering the FTZ and for duty calculations when goods leave the zone for domestic consumption.
• Internal product databases: Store both codes if you import and export the same product. Never substitute one for the other.

How TariffPro Handles Both Systems

TariffPro classifies products under the correct system based on your transaction type. When you specify an import classification, it returns the full 10-digit HTS code with duty rates and trade program eligibility. For exports, it maps to the corresponding Schedule B code. This dual-system approach eliminates the risk of cross-contamination between import and export codes — a common compliance gap that TariffPro closes automatically.