Purchase order best practices for a small business: number every order, approve by threshold, check receipt, match before paying, and never reuse a number. The process itself is not complicated and almost nobody disagrees about the steps. What decides whether it works is which steps have a named owner, because the ones that do not are the ones that stop happening the first week somebody is busy.
Five steps, and the one nothing forces
Request, approve, issue, receive, match. Four of those happen on their own because something external pushes them: somebody wants a thing, an approver is asked, a supplier needs an order, and an invoice turns up. Receipt is the one nothing forces, and it is where the process quietly stops in most small businesses.
Write it as who does what, not as a flowchart
A flowchart of this process is easy to draw and hard to follow, because the boxes are obvious and the ownership is not. The useful version is four sentences naming who raises, who approves above and below the threshold, who checks in a delivery, and who matches the invoice before it is paid.
The threshold carries the approval rule
One approver for everything is a bottleneck people work around by ordering first. Everyone approving their own is not a control. A value threshold does the work: on the worked example a $1,200 request sits $200 above a $1,000 threshold and routes to the second approver without anybody having to recall the rule.
Match before paying, not after
The last step is comparing the invoice to the order, and it only has value before payment. On the worked example order 1042 was agreed at $827.21, so an invoice at $869 is a $42 query. After payment the same difference is a credit note to chase, which is materially more work and often simply absorbed.
Questions people ask about purchase order best practices
What are the steps of the purchase order process?
Request, approve, issue the numbered order, receive and check what arrived, then match the invoice against the order before paying it.
Which step do small businesses skip?
Receipt, almost always, because nothing external forces it. The invoice arrives whether or not anyone checked the delivery, and that is how partial deliveries get paid in full.
Do we need to write the process down?
Four sentences naming who does what is enough, and is more useful than a flowchart. What matters is that the approval threshold and the matching step have named owners.