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Methodology

Where this tariff data comes from

Written by the PMDTC editorial teamLast reviewed August 19, 2026Editorial policy

Everything on this site is built from one source: the official Harmonized Tariff Schedule of the United States published by the US International Trade Commission. This page documents what we loaded, what we changed, and what we do not attempt — so you can judge how far to trust any figure before you act on it.

Source and version

Edition: USITC 2026 Basic Edition, Revision 16, taken from the Commission's own machine-readable export rather than scraped from the PDF or from any third-party mirror. That export was loaded on August 18, 2026 and contains 29,847 tariff lines, of which 19,949 are 10-digit statistical codes usable on a customs entry.

What is verbatim

  • Code numbers, article descriptions, unit of quantity, general (Column 1) rate, special (Column 1) rate, Column 2 rate, quota quantity and additional duties text are reproduced character for character from the export. We do not normalise, round or reword rate text — if the schedule says "Free (A+, AU, BH, CL, CO...)", that is what you see.

What is derived

  • Category paths. The printed schedule conveys hierarchy through indentation, so a line can read simply "Males" with its real meaning sitting three rows above it. We resolved the indent levels once, at import time, into an explicit breadcrumb per line. The wording in each breadcrumb segment is the parent line's own description — nothing is invented.
  • Chapter grouping. Chapters are taken from the first two digits of the code. Chapter titles are the schedule's own titles, lightly shortened for use as page headings.
  • Rate inheritance. Duty rates are legally set at the 8-digit rate line, so most 10-digit statistical codes have blank rate columns. Where that happens we display the nearest ancestor's rate and label the page with the code it came from. We never silently present an inherited rate as the line's own.
  • URLs and page copy. Slugs are generated from descriptions. Explanatory sentences around the tables are written by us and are not part of the official schedule.

What the duty calculator includes

The calculator parses the published rate text for the selected code, picks the general or special column based on the country of origin you choose, and applies the resulting ad valorem percentage to the customs value plus any freight and insurance you enter.

It does not include: antidumping or countervailing duty orders, Section 232 metals tariffs, Section 301 tariffs beyond the broad flag shown for affected origins, merchandise processing fee, harbor maintenance fee, excise tax, or compound and specific rates expressed per unit rather than as a percentage — where a rate is not a simple percentage we say so instead of guessing. Treat the output as an order-of-magnitude figure for planning, not as a landed-cost quote.

Refresh cadence

The USITC publishes several revisions a year. We reload the full export after each revision and update the version stamp shown in the footer and on every code page. Mid- revision presidential proclamations and trade-remedy actions are not reflected until the next revision, which is the single biggest reason to confirm a rate against the live schedule before filing. See our editorial policy for how corrections are handled between revisions.

Sources