A commercial invoice is a form used in international trade
A commercial invoice is a form used in international trade for customs purposes with the details of the parties in the transaction, the goods being shipped and the value of the merchandise. It is a form for customs declaration which should meet requirements of the customs office both of the country of origin and the country of destination.
There is a worldwide harmonized numbered system in international trade and many countries require certificates of origin as well as the commercial invoice for tariff purposes and to ascertain that the goods are authentic and legally manufactured and shipped according to international law.