Global Trade

Country of Origin and Substantial Transformation for Importers

November 8, 2026

Reviewed by Sasha Božič, Licensed Customs Broker

Country of origin is the country where goods were made, and it decides which duties apply at import, including Section 301 duties on Chinese goods and other country-specific tariffs. When a product is made in more than one country, CBP generally treats the origin as the last country where it was substantially transformed into a new and different article with a new name, character or use. Getting origin wrong means paying the wrong duty, or worse.

The substantial transformation test

Processing in a second country changes origin only if it turns the components into a new article. CBP looks at the name, character and use of the product before and after, and at the complexity of the processing. Simple assembly, packaging or finishing usually does not change origin. These questions are decided case by case, often through CBP rulings.

Origin for trade agreements is different

Free trade agreements such as USMCA use their own rules of origin, often based on a change in tariff classification or a regional value content test. A product can have one origin for USMCA preference and another for marking or for Section 301.

Marking

Under 19 U.S.C. 1304, most imported goods must be marked with their country of origin so the ultimate purchaser knows where they were made. Incorrect marking can lead to marking duties and other consequences.

Why origin errors are expensive

  • Overpaying: Declaring China origin for goods substantially transformed elsewhere can add Section 301 duty that did not apply.
  • Underpaying: Claiming a new origin for goods that were only lightly processed creates penalty exposure.
  • Transshipment to disguise origin is enforced aggressively.

Frequently asked questions

How do I get certainty on origin? Request a binding ruling from CBP.

Can I fix origin on past entries? Through a Post-Summary Correction before liquidation, or a protest after.

How Caspian checks origin

Caspian's audit checks declared origin against your supplier data and flags entries where origin, and the duties that follow it, look wrong. See our trade audit. This article is general information, not legal advice.

Works Cited:

Caspian Trade, Inc.
2261 Market Street
San Francisco, California 94114

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