They also serve as an explanation for the exporter. However, certificates of origin can be available in many forms, so a company must carefully consider the requirements of the free trade agreement for which benefits are sought. FTA certificates or declarations should only be issued if your property is qualified for ESTV. Not all FTA agreements require specific forms. There is a special NAFTA certificate (CBP 434) for qualified shipments to Canada and Mexico. Many other FTA partners may accept declarative statements containing certain data elements, including information about how the product qualifies for an FTA. . . .