Skip to content

What Is a Purchase Order (PO)?

Business Terms

Explained Simply

A PO is the buyer's commitment: it sits between the supplier's quote and the supplier's invoice. The usual order is quote (the price offer), purchase order (the buyer accepts and orders), delivery, then invoice (the supplier asks for payment). Issuing a PO number lets a business control spending before money is committed, and gives the supplier a reference to quote on the invoice. Many larger businesses and government departments ask suppliers to quote the PO number on the invoice before they will process payment. Three-way matching means the accounts payable clerk checks that the PO, the goods received note and the supplier's invoice agree on quantity and price before paying. Remember that a PO is not a tax invoice, so a VAT vendor still needs the supplier's tax invoice to claim input VAT.

Need to send a price first? Create a free quote.

Ready to bill for delivered work? Use the invoice generator.