This invoice transaction set is used by suppliers to request payment from their customers for goods or services provided. The seller transmits the 810 to the buyer, typically in response to a purchase order or as a standalone billing document. The transaction begins with the BIG (Beginning Segment for Invoice) segment, which contains essential invoice details such as invoice number, date, and amount due. Supporting information is organized through optional segments like REF (Reference Identification) for cross-referencing related documents and N1 (Name) loops for identifying parties involved in the transaction. The IT1 (Baseline Item Data) loop in the detail section itemizes each product or service being invoiced, including quantities and pricing.

Consider a scenario where Midwest Manufacturing ships widgets to Northeast Retail. After delivery, Midwest’s billing system generates an 810 Invoice with invoice number INV-47392 and today’s date in the BIG segment. The transaction details Northeast Retail as the bill-to party in an N1 loop and lists three IT1 line items: 500 units of blue widgets at $12 each, 300 units of red widgets at $15 each, and a setup charge service. The TDS (Total Monetary Value Summary) segment calculates the grand total of $12,300, which Northeast Retail receives and matches against their purchase order for payment processing.