Purchase Order

A purchase order (PO) is the formal document a business issues to a supplier to authorize the purchase of specific goods or services. It records exactly what has been ordered, the agreed price per unit, the quantity, and the expected delivery date. Once the supplier accepts the PO, it forms a binding agreement between both parties - making it a key document for financial control, dispute resolution, and audit purposes.

For small to medium-sized businesses (SMBs), purchase orders do more than authorize spending. They create a traceable record between an internal approval and a supplier delivery, which protects the business when goods arrive damaged, incomplete, or at a different price than agreed. Without a formal PO process, businesses often face invoice discrepancies they cannot easily challenge because there is no documented agreement to reference.

The Purchase Order Process

A purchase order follows a predictable sequence. An employee identifies a need and requests a purchase - sometimes through a formal purchase requisition, sometimes directly. The request is reviewed and approved by an authorized person, then converted into a PO that is sent to the supplier. When the goods or services arrive, the delivery is checked against the original PO. If everything matches, the supplier invoice is approved for payment. This three-way match - PO, delivery confirmation, and supplier invoice - is the foundation of controlled procurement in any business.

The process breaks down when businesses skip steps. Verbal orders placed directly with suppliers, purchases made without approval, or invoices paid without a matching PO are common problems that lead to overspending and supplier disputes. Once a team gets into the habit of bypassing the PO process for speed, undocumented spend tends to grow quickly.

Why Purchase Orders Matter for Order-Based Businesses

Businesses that operate on a project or order basis - such as promotional merchandise distributors, AV integrators, or construction subcontractors - often need to raise multiple purchase orders per customer job. Each supplier on a job may need its own PO covering materials, components, or services specific to that project. Tracking these POs against the customer order allows the business to monitor committed costs in real time, compare actual spend against the original quote, and identify cost overruns before they affect margin.

Zigaflow's purchase orders feature (/purchase-orders) lets businesses raise and manage supplier POs directly against customer jobs, so committed costs are visible alongside the original quote from the moment a PO is raised.