What Is a Non PO Invoice

A non-PO (Purchase Order) invoice, also known as a non-purchase order invoice, is a type of invoice that is submitted by a vendor or supplier for products or services that were provided to a buyer without a prior purchase order being issued. Unlike traditional invoices that are generated after a purchase order has been issued and accepted, a non-PO invoice is created based on an agreement between the buyer and the supplier, usually through a contract or other means of communication.


In traditional business transactions, a purchase order serves as the primary document that outlines the details of a purchase, such as the quantity, price, and delivery terms of the products or services being acquired. Upon receipt and verification of the goods or services, the buyer generates a purchase order invoice to request payment from the buyer.

However, there are scenarios in which a purchase order is not issued prior to the receipt of products or services. This could be due to various reasons, including urgent requirements, ongoing service agreements, or specific arrangements between the buyer and the supplier. In such cases, a non-PO invoice is used to initiate the payment process.


Non-PO invoices offer several advantages for both the buyer and the supplier. For the buyer, it provides flexibility in procuring goods or services quickly without the need for a formal purchase order process. This can be particularly useful in situations where immediate action is required, such as in emergency situations or for urgent project needs.

For suppliers, non-PO invoices enable them to expedite the payment process for the services rendered or products delivered. This allows for faster revenue recognition and improved cash flow management. Additionally, non-PO invoices can help streamline administrative processes by eliminating the need for manual purchase order creation and approval.


Non-PO invoices find widespread use in various industries and sectors, particularly in areas where ad-hoc or specialized services are commonly required. For example, in the IT sector, where custom software development projects often involve a dynamic and ever-changing scope, non-PO invoices provide a practical way to account for additional work or changes during the development process.

Non-PO invoices are also commonly used in consultancy services, where service providers may be engaged on a retainer basis or for discrete projects without the need for a purchase order for each engagement. Additionally, industries such as healthcare and finance, which deal with highly regulated environments and strict compliance requirements, often employ non-PO invoices to facilitate efficient payment processing.


In summary, a non-PO invoice is a type of invoice that allows for the payment of goods or services without the requirement of a traditional purchase order. It serves as a means to streamline the payment process and expedite transactions in situations where a purchase order is not feasible or necessary. By understanding the concept of non-PO invoices, businesses can enhance their operational efficiency and effectively manage their financial transactions within the dynamic landscape of the information technology and related sectors.

This glossary is made for freelancers and owners of small businesses. If you are looking for exact definitions you can find them in accounting textbooks.

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