Certificate of origin (COO)
A certificate of origin (COO) is a document attesting to the country in which goods were produced, used by customs authorities to determine tariff treatment, eligibility for preferential duty rates under trade agreements, and trade statistics. Origin follows the country where the last substantial transformation occurred, not where goods were shipped from, which makes accurate supplier origin data the foundation of duty planning.
Examples
USMCA claim: A buyer imports cable assemblies from Mexico at $11.80 each, 240,000 units a year. With valid USMCA certifications on file the parts enter duty free instead of paying the standard rate, and the team refreshes blanket certifications before each calendar year so claims never lapse.
Stale certificate: A supplier moves machining from Taiwan to mainland China mid-year without updating its origin declaration. The importer keeps declaring Taiwan origin until a customs audit catches the change; back duties on 14 months of entries cost $86,000 plus interest, and the supplier now owes notice of any production move.
Definition
Origin sounds like a shipping fact but it is a legal determination. A motor assembled in Malaysia from Chinese and Japanese components is not automatically Malaysian; it depends on whether the assembly amounts to substantial transformation or, for preferential claims, whether it satisfies the specific rule of origin in the relevant free trade agreement (a tariff classification shift, a regional value content threshold, or both). Re-routing freight through a third country changes nothing about origin.
Certificates come in two flavors. Non-preferential certificates establish origin for ordinary tariff treatment, marking, and statistics. Preferential certificates or certifications support a reduced or zero duty claim under an agreement, and they carry audit risk: claim a preference you cannot substantiate and customs can claw back the duties with penalties years later.
For procurement this becomes a recurring data campaign: solicit origin declarations from every supplier, tie them to part numbers and HTS codes, and keep the records your customs broker needs at entry. Suppliers change their own sub-sources mid-year, so treating a certificate as permanent is how preference claims quietly go stale.
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