Method

Where these numbers come from, how current they are, and what they leave out.

How to read a tariff line

Every imported product has a tariff number, and every tariff number carries three duty rates:

General

The rate for goods from most countries.

Special

The lower rate for goods that qualify under a trade agreement. Each agreement has a letter code. USMCA's code is S.

Column 2

The rate for the few countries the United States has no normal trade relations with.

Take knitted sweaters of man-made fibers, tariff number 6110.30.30. The general rate is 32%. The special column reads Free (AU,BH,CL,CO,IL,JO,KR,MA,OM,P,PA,PE,S,SG), and the S in that list is USMCA. A sweater that qualifies as USMCA originating comes in free instead of at 32%. That gap is the reason to make the claim.

Since August 22, 2026 there has been a second thing to check. A set of duties on Canadian goods, imposed under Section 338 of the Tariff Act of 1930, apply no matter which country the goods originate in. They reach 554 tariff numbers, and on 280 of them the special column still reads free under USMCA. That reading is now incomplete, because the Section 338 duty is owed on top of it. The sweaters above are one of the 280.

Sources

Duty rates come from the U.S. International Trade Commission's Harmonized Tariff Schedule, Revision 18 (2026).

Section 338 coverage comes from HTS Chapter 99, U.S. note 51. The proclamations that created these duties put the list of covered products at the back. In the Federal Register those lists are scans, essentially photographs of a printed page, so you cannot search them or copy a tariff number out of one. Chapter 99 of the tariff schedule repeats the same lists as text, so that is the version used here.

Proclamation wording is quoted from the Federal Register.

What is counted

A tariff number appears here only if it carries special-rate code S and its general rate is something other than free. Numbers already duty free for every country are left out, because a USMCA claim on them saves nothing.

Operative text over headlines

Proclamation 11056 is titled "Temporary Suspension of Additional Duties" and its preamble discusses suspending duties for three days. What the operative paragraph does is narrower: it moves an effective date from August 19 to August 22, 2026. The duties took effect. Where a title and the operative text point in different directions, this site follows the operative text and quotes it.

How current this is

Rates change when the Commission issues a new revision of the schedule, and this site updates as soon as feasible. The revision every page was drawn from is named in the top right corner, so you can tell at a glance whether you are looking at current figures.

New trade actions are watched frequently. A proclamation does not change anything here until it has been reviewed.

Limits

This is a reference, not legal advice, and it will not stand in for a binding ruling from CBP. It does not calculate landed cost. It ignores antidumping and countervailing duties, quota status, and Chapter 98 provisions, any of which can change what you owe. Classification remains the importer's responsibility.