The accounts payable department is measured on invoices processed, exceptions cleared and not paying twice, and it is blamed for slow payments. What is rarely acknowledged is that the two largest determinants of its workload, whether purchases have orders behind them and whether deliveries are recorded, are decided by other people. Being clear about the boundary is useful for everybody.
What payables owns
Receiving invoices, validating them, performing the match, routing for approval, coding, scheduling payments, sending remittances, reconciling supplier statements and maintaining supplier records. Within that stretch it controls tolerance, exception routing and ageing, and those three determine how efficiently it handles whatever arrives.
What decides its workload
Purchase-order coverage and goods-receipt discipline, both owned elsewhere. An invoice with an order and a receipt behind it can clear with almost no attention; one without needs research. The ratio between those two populations is set upstream, and no amount of payables effort changes it. Reporting that ratio by department is usually more effective than chasing individuals.
Where the friction sits
At the two boundaries: with purchasing over orders and prices, and with operational staff over receipts. Both are structural, because those teams are measured on other things. The productive response is measurement and visibility rather than exhortation: a monthly count of invoices without orders, by department, tends to change behaviour where a reminder email does not.
Questions people ask about accounts payable department
How large should a payables team be?
It depends on invoice volume and on how many arrive matchable. Two organisations with identical volumes can need very different headcounts depending on upstream discipline.
Should payables report to the controller?
Usually, since it is a control function. What matters more is that somebody senior can arbitrate at the boundary with purchasing.
What should payables be measured on?
The queue by state, the age of the oldest item, and the share matching cleanly. The last is partly a measure of other departments, which is worth saying out loud.