Tariff classification is more than selecting a 6‑digit HS heading. In each market, duty rates, import restrictions, and trade remedies are applied at the full national tariff line level (often 8 to 10 digits). Aim to determine, or help your importer determine, the full line by providing detailed technical descriptions, materials, uses and product literature.
Classification is interpretive and can vary by country because customs authorities apply their own legal notes, administrative guidance and, in some cases, published rulings. Where your products are complex or high value, consider reviewing destination country guidance and, where possible, seeking written or binding rulings from the customs authority in the target market. Keep rulings on file for future reference.
Different FTAs use different certification and documentation systems. This creates operational complexity for exporters dealing with multiple markets.
Key differences you may encounter:
- Self-certification vs. third-party certification: Some agreements (for example, the Canada-United States Mexico Agreement (CUSMA), and the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP)) allow knowledge-based self-certification by the exporter, importer, or producer. Other agreements require certificates issued by chambers of commerce or government authorities.
- Prescribed forms vs. flexible formats: Some FTAs mandate specific certificate formats with exact wording. Others accept origin statements on invoices or any commercial documents, provided they contain required data elements.
- Who can certify: Under some agreements, only exporters can certify. Under others, importers, exporters or producers may certify. Some require approved exporter status for simplified procedures.
- Record keeping: All FTAs require supporting records to substantiate origin claims, but the specific documents needed and retention periods (typically 3 to 7 years) vary by agreement.
Before claiming preferential tariff treatment:
- confirm the specific certification format and requirements for your product under each FTA
- identify who can certify (exporter, importer, producer, or government authority)
- understand what supporting records you must maintain and for how long
- consult your customs broker to confirm requirements for your specific product and market combinations