Processing a purchase invoice is seven steps, and in almost every organisation that measures them, six take minutes and one takes days. Knowing which is which is what separates an improvement that suppliers notice from one that improves a step nobody was waiting on. The bottleneck is nearly always the same step for the same reason.
The six quick steps
Arrival at a monitored address with the date recorded. Capture into a record. Validation against known suppliers and previous invoice numbers. Matching against the order and receipt. Coding, ideally inherited from the order. And scheduling into a payment run with a remittance advice at the end. All mechanical, all largely automatable, all measured in minutes.
The one slow step
Approval, because it is performed by somebody outside finance with other priorities who receives the request as one more item in an inbox they are behind on. Add absence with no delegate and the tail grows. None of this is fixed by a better form: it is fixed by routing, automatic cover and escalation to a named alternative.
And the step that decides everything upstream
Whether the invoice arrived with an order and a receipt behind it. That is decided before payables sees anything, and it determines whether the invoice takes the six-minute path or the multi-day investigation. Measuring that share, by department, is more useful than any internal process improvement payables can make alone.
Questions people ask about purchase invoice processing
How do we find our own bottleneck?
Record, for fifty invoices, the date at each step. The gaps make it obvious within an hour of analysis.
Which step should we automate first?
The one your measurement shows is slowest, which for most teams is approval routing rather than capture.
What is the cheapest improvement?
Consolidating arrival channels so nothing reaches an individual's inbox, which costs nothing and closes the largest leak.
Should payables chase missing purchase orders?
Payables should count and report them by department; the behaviour belongs to purchasing and to whoever manages both. Peer chasing between departments rarely produces a durable change on its own.
What should a supplier do to be paid faster?
Quote the purchase order reference, bill the address you asked them to use, and invoice promptly. Those three remove most of the avoidable delay, and they are worth telling suppliers explicitly rather than assuming.