A trade agreement reduces duties only for goods that originate in a partner country. Deciding what originates where is governed by detailed rules that shape how products are made.
Shipping from a country is not origin
Goods must be produced in the partner territory in a defined sense, not merely dispatched from it. Otherwise any agreement could be used by routing goods through a member.
Goods wholly obtained in a country, such as minerals extracted or crops grown there, present no difficulty. Manufactured goods with imported inputs are the hard case.
Rules therefore specify what processing must occur locally for a product containing foreign materials to count as originating.
Three main tests are used
A change of tariff classification test requires that imported inputs enter under a different code from the finished product, demonstrating substantial transformation.
A value content test requires that a specified proportion of the value be added locally, calculated either from originating content or by limiting non-originating materials.
A specific process test requires a named operation to be performed in the territory, common in textiles and chemicals where the decisive step is well defined.
Minimal operations do not confer origin
Agreements list operations that never confer origin regardless of any test, including packaging, labelling, simple assembly, sorting and mixing.
The provision prevents a superficial final step from converting foreign goods into originating ones, and it is applied strictly.
Tolerance provisions work the other way, allowing a small proportion of non-originating material that would otherwise fail a classification test.
Cumulation links partner countries
Cumulation permits materials from another party to the agreement to count as originating, which allows production to be shared across several partner countries.
Wider arrangements extend this across a network of agreements with common rules, enabling regional supply chains that no single bilateral agreement would support.
The scope of cumulation is often the most commercially significant part of an agreement, since it determines whether existing supply chains qualify without restructuring.
Compliance is a documentation obligation
Claiming preference requires a declaration of origin, and the exporter must be able to demonstrate the claim with supplier declarations and production records.
Records must generally be retained for several years, and customs authorities can verify claims retrospectively through the partner administration.
Where verification fails, duty becomes payable on past shipments, which is why many exporters forgo preference on low-margin goods rather than carry the administrative burden.