Rules of Origin
The tests that decide where goods legally originate. They are written for each tariff heading.
Goods wholly obtained in one country originate there. For goods made from materials of several origins, the rule for the tariff heading decides. Usually the rule is a change of HS classification at four or six digits. Sometimes it is a minimum percentage of local value.
Preferential rules under a trade agreement are different from non-preferential rules, and often stricter. To claim preference you must apply that agreement's rule. Stating where the factory is does not count.
Repackaging, labelling, simple assembly and dilution never give goods a new origin, however much work they involve.
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