Purchase Order (PO)

A Purchase Order (PO) is a formal document issued by a buyer to confirm an order of goods or services under agreed terms. It outlines the key details of the purchase, including descriptions of items or services, quantities, unit prices, delivery timelines, and any applicable contract references or terms and conditions. Once the supplier accepts the PO, it becomes a legally binding agreement, forming a simplified contract between the two parties.

In public procurement, purchase orders are widely used for routine, low-value, or call-off purchases under existing agreements. For example, under a framework agreement or dynamic purchasing system, POs are the mechanism through which actual orders are placed—without needing to re-negotiate terms or run a new competition. Public sector buyers use POs to ensure compliance, traceability, and control over decentralized purchasing activities while maintaining administrative efficiency.

In practice, purchase orders help streamline procurement and ensure accountability. They provide clear instructions to suppliers and an auditable record for buyers. When issued under established frameworks or catalog systems, POs allow for rapid, compliant ordering that supports operational needs without duplicating procurement effort. For suppliers, an accepted PO offers assurance of payment based on pre-agreed conditions.