Accounts Receivable Automation ROI: Two Numbers, Not One (2026)

A collections team pays twice for every late invoice. It pays in hours: someone checks the aging report, writes the reminder, answers the reply that says the PO number is missing, matches the payment that arrives without a reference. And it pays in capital: the amount sits unpaid while all of that happens, and the company finances it with its own cash or a credit line. Automation touches both, and they need separate arithmetic.

Both figures come from a vendor of AR software and its commissioned research, so read them as the optimistic edge. They are useful for one thing: they show that the DSO effect is real and measured in days, not in percent of a vague productivity gain.

A collections touch is a reminder, a statement request or a dispute reply. Our working estimate from delivered projects is six minutes for a person: open the invoice, check the history, write, send, note it. At a fully loaded 35 euros an hour that is 3.50 euros per touch.

The model reads the invoice and the thread, about 1,500 input tokens, and writes a 300-token reply. At Claude Sonnet 5 list prices of 2 and 10 dollars per million tokens, with a 1.2 factor for retries, that is well under a cent. A person still reads three reminders out of ten for two minutes each, which adds 0.35 euros. AI per touch: about 0.36 euros.

At 1,500 touches a month the person costs 5,250 euros and the model with review about 540 euros plus 60 euros of hosting. The monthly difference is about 4,650 euros; against a 14,000 euro build the payback is three months and the first-year saving about 41,800 euros. That is the number for the operations lead. It is not the number for the CFO.

Days sales outstanding is the average number of days between invoicing and payment. Cut it by seven days and the cash that used to arrive on day 55 arrives on day 48, once, permanently, for every invoice. The formula is short: daily invoiced revenue times the days you cut equals the cash released. What that cash costs you today, your cost of capital, is the yearly financing saving.

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Cash released is not profit. It is working capital you stop financing. Put the financing saving in the business case, and the cash figure on the table when liquidity is the constraint.

Notice the asymmetry. At 500,000 euros of monthly revenue the DSO effect is worth 9,205 euros a year in financing, less than the 41,800 euro saving on hours. At five million a month the same seven days release 1.15 million euros and save 92,000 euros a year, and the hours become a footnote. Which number leads your case depends on your revenue, which is why the calculator keeps them apart.

The calculator does not assume a reduction, because the honest answer depends on why your invoices are late. Open your aging report and look at the invoices that eventually paid without a dispute. How many days late was the typical one? A consistent reminder sequence recovers part of that lateness; it does nothing for invoices held by a genuine dispute or by a customer who cannot pay.

A defensible entry is a third of the typical lateness as the conservative case and the whole of it as the goal. If your typical late invoice pays 12 days after due, enter four days first and see what that is worth. Then enter twelve and label it the ceiling.

The first version is smaller than the vendor brochure. It reads open invoices from your accounting system, writes reminders in your tone with the real invoice details, sends them from your mailbox on the schedule you set and stops the moment payment lands. Replies are classified: a promise to pay gets a note on the promised day, a dispute goes to the right person with the invoice attached, everything else queues for a human. Remittance matching and the aging report as a conversation come in the second build.

Systems we connect to: Xero, QuickBooks, Sage, Microsoft Dynamics, SAP Business One, Odoo or a bank statement export. The workflow and process automation service describes the build and the handover; the back office calculator prices the invoice-entry side of the same team.