Knowledge Base
Purchase Order
A purchase order (PO) is a document a buyer issues to a supplier before a purchase, specifying the items, quantities, and prices agreed to, and creating the record an invoice is later checked against.
How a purchase order works
The buyer issues a PO listing items, quantities, and agreed prices; the supplier fulfills against it; and when the invoice arrives, accounts payable matches invoice to PO to receiving record — the three-way match. Anything billed that was not ordered, or billed at a price other than the one agreed, surfaces in the match. POs give a property a paper trail before money is committed, which is the opposite of the multifamily default, where the invoice is often the first document anyone sees.
Why POs are rare in multifamily maintenance
PO systems assume purchases are planned. Multifamily maintenance is largely unplanned — the water heater fails in the afternoon and the part is bought within the hour. Requiring a PO for every urgent part either slows repairs or trains the site team to work around the system. Most operators reserve POs for planned work — unit turns, capital projects, bulk orders — and let small MRO purchases flow through house accounts. The consequence: the majority of transactions, and a large share of pricing risk, live exactly where the control does not. That gap is what a multifamily invoice audit is built to cover.
A PO controls process, not price
The three-way match confirms you were billed what you agreed to pay. It cannot confirm that what you agreed to pay was a good price — an overpriced part on a PO matches perfectly. Price control is a separate discipline: comparing the items actually bought against other verified suppliers, whether or not a PO existed. That is the check The Benchmark performs on every paid invoice line each quarter, and it is why a vendor invoice audit finds money even at properties with clean AP controls. Matching catches billing errors; pricing catches expensive habits.
Related terms
Start with one property and one quarter
Send us a quarter of invoices and we will show you what it should have cost. If there is nothing there, we will tell you that too.
