Microsoft's Payables Agent reads supplier invoices and turns them into purchase invoices in Business Central without a person keying them. Here is what happens to a real invoice, step by step, where it stops and asks, what it gets wrong, and how to decide whether it is worth 50p an invoice for your purchase ledger.
Of the agents Microsoft has shipped in Business Central, the Payables Agent is the one with the clearest business case, because supplier invoice processing is high-volume, repetitive, and nobody enjoys it. It is also the one most likely to be oversold. This is what it does, with a real invoice, and what it does not.
An agent is not a chat window. It is a background process with its own user account, permissions and task list, that watches for something (in this case, supplier invoices arriving), does a series of steps, and hands the result to a person for review. The Payables Agent watches a mailbox you nominate, picks up invoices (PDF, image, or e-documents arriving through the e-document framework), reads them, and creates draft purchase invoices in Business Central.
A supplier emails a three-line invoice for stationery against a purchase order you raised last week.
That is the whole thing. The agent does the capture, the matching and the keying. The person does the judgement and the posting.
By design, often. Unknown supplier. Two possible suppliers. No purchase order and no receipt to match. Price or quantity outside tolerance. VAT that does not add up. A credit note it is not sure is a credit note. Duplicate invoice number. Anything the extraction was not confident about. Each of these is a flag on the draft and a reason the review step exists. You can set the tolerances and you can widen what it is allowed to do, and you should do both slowly.
It runs on Copilot Credits, which are metered: 50 credits per invoice plus 5 per line, at $0.01 a credit pay-as-you-go, so roughly 50p for a three-line invoice and about £1.15 for a twenty-line one. There is no free allowance. We worked through the numbers for different sizes of business in the real cost of AI agents; the short version is a few hundred pounds a month for a small purchase ledger and a five-figure annual line for a large one.
Do the sort. Take a month of supplier invoices and split them: routine (known supplier, PO-backed, within tolerance) and everything else. The agent will handle the routine ones in a glance-and-click, and it will hand most of the others back to you with the keying done but the judgement still needed. If routine is 70 per cent or more of the volume, and the volume is a few hundred a month or more, it pays for itself in hours and in posting accuracy. If routine is 30 per cent, you are paying 50p an invoice for data entry on documents a person still has to think about, which may still be worth it, but it is a smaller win.
Then pilot: one supplier group, one month, review step on, count what it got right. Widen from there. And whatever you do with the time it saves, keep the person who understands the purchase ledger; the agent is a tool, not a clerk, and the day it stops, someone has to know how the invoices get in.
If you would like the pilot set up properly (mailbox, permissions, tolerances, supplier defaults, the review workflow), it is about two days of work and we have done it enough times to know where it goes wrong. Talk to us.
