Third Party Invoicing (TPI) refers to the arrangement, where an invoice that accompanies the preferential Certificate of Origin and used for the clearance of goods in the importing Party, is not issued from the exporting Party but from another country who may not necessarily be a Party to the same FTA. In some FTAs, TPI is commonly referred to as Third Country Invoicing.

An example with graphical illustration can be found in the Handbook on Rules of Origin for Preferential Certificates of Origin page 19.