Purchase order
A purchase order (PO) is a legal document issued by a buyer authorizing a supplier to deliver specified goods or services at agreed prices and terms. The PO represents the buyer's formal commitment to purchase and, when accepted by the supplier, forms a binding contract. Purchase orders create clear documentation of what was ordered, at what price, and under what conditions.
Examples
Standard purchase order: A manufacturing company issues a PO for 5,000 units of a specific component at $2.50 each, referencing the supplier's quote number, specifying delivery to a particular location within 4 weeks, and indicating payment terms of Net 30. The PO includes the buyer's standard terms and conditions.
Service purchase order: A company issues a PO for consulting services, specifying the scope of work, hourly rates, not-to-exceed amount, project timeline, and deliverables. The PO authorizes the consultant to begin work and submit invoices against the authorized amount.
Capital equipment PO: A buyer issues a purchase order for manufacturing equipment including the unit price, installation services, training, warranty terms, acceptance criteria, and milestone payment schedule tied to delivery, installation, and successful qualification.
Definition
Purchase orders serve multiple functions in business operations. They authorize suppliers to ship or perform work, commit the organization's funds, create legal documentation of the transaction, and provide the reference point for receiving, invoicing, and payment processes.
Standard PO elements include: unique PO number, buyer and supplier identification, item descriptions with quantities and unit prices, delivery address and required dates, payment terms, applicable terms and conditions, and authorized signatures or approval indication.
Many organizations establish PO requirements based on dollar thresholds, requiring POs for purchases above certain amounts while allowing purchasing cards or simplified processes for smaller transactions. This balances control with administrative efficiency.
Modern procurement systems automate PO creation from approved [requisitions](purchase-requisition.md), electronic transmission to suppliers, and integration with receiving and accounts payable systems for the procure-to-pay process.
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