When do I need a NAFTA Certificate of Origin?

When shipping between Mexico, Canada and the United States, companies seeking the benefit of reduced or eliminated rates of customs duty through the North American Free Trade Agreement, can do so with the proper paperwork. Shipments valued at $1,00 USD or less require only the NAFTA statement be present on the commercial invoice. Shipments valued at greater than $1,00 USD, or when required by the buyer, should have a chamberized NAFTA Certificate of Origin, along with the air waybill and commercial invoice.