Where can I look up the official HTSUS?

The official HTSUS is published by the US International Trade Commission (USITC) at hts.usitc.gov. Our calculator uses USITC data and applies the current rates automatically.

How often do HTSUS rates change?

The base HTSUS rates change rarely (typically during HS revisions every 5 years). But Section 301 exclusions and modifications change quarterly. Our data refreshes weekly via USITC API.

US Tariff Schedule — HTSUS Lookup Guide for Importers (2026)

The Harmonized Tariff Schedule of the United States (HTSUS) is the official guide to US import duty rates. It contains over 10,000 tariff lines organized into 99 chapters. Every product imported into the US must be classified under a specific HTSUS subheading, and the duty rate attached to that subheading determines how much you pay at customs.

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How the HTSUS works

HTSUS uses a 10-digit classification system. The first 6 digits are the international HS code (same worldwide). Digits 7-8 are the US-specific subheading. Digits 9-10 are statistical suffixes that don't affect duty but are required on entry documents.

Example: 8517.62.00.90. 8517.62 = wireless communication apparatus (HS-6). 00 = US subheading. 90 = statistical suffix.

Duty rate types

HTSUS rates come in three forms:

Ad valorem: a percentage of the customs value (e.g., 16.5% on cotton t-shirts). Most common.
Specific: a fixed dollar amount per unit (e.g., 2.5 cents per kilogram on certain chemicals).
Compound: both ad valorem and specific combined (e.g., 4.9¢/kg + 9.8% on some dairy products).

Column 1 vs Column 2 rates

Column 1 General: the MFN rate. Applies to imports from WTO member countries (almost everyone). This is the rate you'll pay on Chinese, European, Vietnamese, Indian goods.

Column 1 Special: preferential rates under FTAs (USMCA, CPTPP, etc.) or trade programs (GSP, AGOA).

Column 2: punitive rates for non-MFN countries (Cuba, North Korea, Russia). These can be 2-10x higher than Column 1.

Section 301, 201, and 232 tariffs

Section 301 (China): additional tariffs of 7.5-25% on specific Chinese products on top of the HTSUS rate. The specific products are defined by USTR lists that change quarterly.

Section 232 (steel and aluminum): 25% on steel and 10% on aluminum from most countries. Applied regardless of origin.

Section 201 (safeguard): applies to specific products like washing machines and solar cells from all origins.

Frequently asked questions

Where can I look up the official HTSUS?: The official HTSUS is published by the US International Trade Commission (USITC) at hts.usitc.gov. Our calculator uses USITC data and applies the current rates automatically.
How often do HTSUS rates change?: The base HTSUS rates change rarely (typically during HS revisions every 5 years). But Section 301 exclusions and modifications change quarterly. Our data refreshes weekly via USITC API.

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