Official-source first

Sources and limits

This site is designed as a research shortcut. It should point you back to official tariff text, rulings, and customs guidance before you act.

USITC Harmonized Tariff Schedule

The lookup index is generated from USITC's 2026 HTS Revision 21 JSON release, released October 9, 2026. It contains 29,861 indexed rows. The pinned raw export has SHA-256 bea73f235732215a4bfab973be7495c16c450c65b78e40f58324031ebf092a09.

Open USITC Revision 21

USITC Open Data

USITC publishes HTS data in downloadable and machine-readable formats, including CSV, Excel, JSON, and API access.

Open USITC data

CBP CROSS Rulings

CBP's rulings database helps researchers compare product facts against prior classification rulings. Rulings can be highly fact-specific.

Search CBP rulings

Trade.gov HS Code Guide

Trade.gov explains the relationship between HS codes, HTS numbers, and Schedule B numbers for U.S. import and export workflows.

Read Trade.gov guide

World Customs Organization

The WCO maintains the international Harmonized System, which is the global 6-digit foundation used by customs authorities.

Read WCO overview

HS Finder Methodology

Read how the lookup index is generated, how hierarchical descriptions are expanded, and what the ranking does not claim to prove.

Read methodology

What this site does not do

It does not issue customs rulings, guarantee a code, calculate all trade remedy duties, determine admissibility, or replace a licensed broker or official customs authority.