AP automation ROI calculator
Model whether an AP automation purchase can pay back under your own workload assumptions. The calculator uses only the costs and remaining manual effort you enter. Need a software fee to enter? Start from published AP automation pricing for 8 vendors.
Page reviewed September 30, 2026.
Current AP process
What invoice processing costs you today.
Automation scenario
Use pricing and workload assumptions you want to evaluate.
Modeled result
Cost comparison
Costs that are easy to leave out
- Remaining manual work: exceptions, mismatches, and approval follow-up that still need people after go-live. Enter it as residual staff hours; it is often what separates a modeled saving from a real one.
- Transaction and payment fees, which grow with volume rather than staying fixed.
- Implementation, data migration, and your own team's setup time, entered as the one-time cost.
- Renewal terms: ask for them in writing before you rely on year-one pricing.
Frequently asked questions
How do you calculate AP automation ROI?
Work out what an invoice costs today and what it would cost after automation, multiply the difference by monthly invoice volume, and divide the one-time implementation cost by that monthly saving to get break-even months. Current cost per invoice = (AP staff hours × fully loaded hourly cost + other monthly AP costs) ÷ monthly invoices. Automated cost per invoice = (software fee + per-invoice fee × monthly invoices + remaining staff hours × hourly cost) ÷ monthly invoices.
What is a good ROI for AP automation?
There is no universal benchmark worth trusting, and this calculator uses none. Vendor-published savings figures describe their own customers, not your process. The practical test is whether your own inputs produce positive monthly savings and a break-even period you can defend internally.
How long does AP automation take to pay back?
Break-even months = one-time implementation cost ÷ modeled monthly savings. The calculator shows a payback period only when your inputs produce positive savings; when the automated cost per invoice is higher than today's, it says so instead of inventing one.
Does this ROI calculator use vendor savings claims?
No. It computes only from the numbers you enter; the methodology documents the formulas.
Next steps
Match vendors to your requirements · Test shortlisted vendors with the AP Vendor Evaluation Kit