When a product is made from parts or materials sourced from multiple countries, the country of origin is determined by where the last substantial transformation occurs.
Substantial transformation means a process that changes the product’s name, character, or use. It’s not just about final packaging—it’s about where the product becomes what it essentially is.
For example:
If components come from China, Germany, and Mexico—but the final product is fully assembled and functionally transformed in Mexico—then Mexico may be considered the country of origin.
If only minor assembly or packaging happens in a second country, the origin is likely still attributed to the country where most manufacturing took place.
Because rules of origin can vary depending on the product category, it’s a good idea to:
Ask your customs broker to confirm origin based on your specific product and manufacturing steps
Note: Answers reflect the current status as of April 18th, 2025. We’ll continue updating this article as policy changes are announced.