How much does it cost to process an invoice, and where can you save?
Senior Manager Content Marketing at Medius
- Introduction
- What actually goes into the cost of processing an invoice?
- Four factors driving invoice processing costs up
- The hidden costs most AP teams don't count
- Where AP automation delivers the biggest ROI
- Six strategies to reduce invoice processing costs
- How to benchmark your own invoice processing costs
The average cost to process an invoice is $10.18. Best-in-class accounts payable teams bring their AP cost per invoice down to $2.36, and bottom-quartile performers pay $25 or more, according to Ardent Partners' State of ePayables benchmark research. That spread, nearly $23 per invoice between the top and bottom performers, is the single clearest way to see what AP automation ROI actually looks like in dollars.
For a company processing 5,000 invoices a month, closing the gap between average and best-in-class performance is worth roughly $469,000 a year. This guide breaks down what drives invoice processing cost today, where automation delivers the most savings, and the specific changes that move a team from the average column to the benchmark column.
What actually goes into the cost of processing an invoice?
Invoice processing cost isn't one number. It depends on invoice volume, the mix of PO versus non-PO invoices, whether AP is centralized or spread across business units, and how much of the process is automated versus manual.
Two companies of the same size can have wildly different costs per invoice based entirely on process design. That's why benchmarking against the $2.36 to $10.18 range, and the $25-plus bottom-quartile tail, matters more than comparing yourself to a single competitor: it shows you both the ceiling on efficiency and how far behind a struggling AP process can fall.
Four factors driving invoice processing costs up
Manual, paper-based workflows
Paper invoices, manual data entry, and physical routing for approval are the single biggest driver of labor cost per invoice. Every manual touchpoint adds time, and time is the largest line item in the cost-per-invoice equation. Moving to digital invoice capture removes most of that labor before an invoice ever reaches an approver.
Weak invoice matching
Without automated invoice matching, AP staff reconcile invoices against purchase orders and receipts by hand, line by line. That's slow, and it's where most coding errors and duplicate payments originate. Line-item-level automated matching cuts this step down to an exception-only review.
Slow, office-bound approval chains
An approval workflow that depends on someone being at their desk, or on a paper form physically moving between offices, adds days to your invoice cycle. Every extra day increases the odds of a missed early-payment discount and increases the labor cost of tracking down approvers.
Legacy, on-premise AP systems
Maintaining older AP software adds hosting, IT maintenance, and licensing costs that don't show up in a per-invoice calculation but absolutely belong there. Cloud-based platforms remove that overhead and update automatically, which is part of why they show up consistently in benchmark comparisons of top performers.
Each of these factors compounds. A team with paper invoices, manual matching, and a legacy system isn't paying for three separate problems; it's paying the combined cost of all three at once, which is usually where the $10.18 average, and the $25-plus costs at the bottom of the range, come from in the first place.
The hidden costs most AP teams don't count
The direct labor cost of processing an invoice is only part of the picture. Several costs compound quietly in the background:
- Late payment fees and missed early-payment discounts (many vendors offer roughly 2% for fast payment, a discount most manual AP teams can't capture consistently)
- Rework from data entry errors and duplicate payments
- Audit and compliance exposure from inconsistent approval trails
- Fraud risk, which rises when manual processes make it harder to catch anomalies before payment
These costs rarely appear in a simple per-invoice calculation, but they're a real part of why the gap between average and benchmark performers is so wide.
Where AP automation delivers the biggest ROI
Medius's 2025 AP Benchmark Report puts real numbers behind that gap, and they're more dramatic than the cost-per-invoice range alone suggests. Ardent Partners' industry data shows the average company runs a 38.3% touchless processing rate for PO invoices, with a total processing time of 11.6 days per invoice. Best-in-class teams in the same report hit a 96.3% touchless processing rate and close out a PO invoice in 1.4 days. That jump in touchless processing, more than the cost-per-invoice number itself, is where the bulk of AP automation ROI actually comes from: it's what happens when invoices stop needing a person at every step.
Non-PO invoices show a similar spread: best-in-class teams route 99.5% of them automatically, approve them in 1 day on average, and finish total processing in 2.1 days. That's not a marginal improvement. It's a different way of running AP entirely.
Chadwell Supply moved from 20% touchless processing to 89.4% after automating
TVH runs a 75.7% touchless capture rate
Duni Group hits a 97.6% automatic routing rate
Rejmes Personvagnar AB averages a 1.4-day approval time
These are current customer results, not theoretical projections, and they're the clearest evidence that the $2.36 benchmark isn't a ceiling, and that AP automation ROI compounds well beyond the initial cost-per-invoice drop. It's what happens when touchless processing becomes the default instead of the exception.
Weighed against savings like these, AP automation cost is usually recovered in months, not years. Most mid-market teams see payback well inside the first year once touchless processing is handling the bulk of their invoice volume.
Six strategies to reduce invoice processing costs
None of these require a full AP overhaul on day one. Most teams close the gap between average and benchmark performance in stages, starting with the change that removes the most manual labor first.
Go paperless first
Digital capture and extraction technology eliminates manual entry regardless of the invoice format a vendor sends. This is the foundation every other improvement builds on.
Automate end to end
An AP automation platform that covers everything from receipt to payment, not just data capture, is what separates benchmark performers from average ones. Partial automation still leaves manual bottlenecks in the workflow.
Match invoices at the line-item level
Advanced invoice automation matches invoices to purchase orders and receipts automatically, enabling touchless processing for the majority of invoices and leaving staff time for the exceptions that actually need judgment.
Let AI handle routine approvals
This is the biggest shift since the last time most AP teams reviewed their process. AI-powered tools like Medius Copilot can flag anomalies, recommend approvals, and route routine invoices automatically, so approvers spend their time on the invoices that carry real risk instead of rubber-stamping the rest. Copilot is already live across 406 customers and more than 3,300 individual users, which puts it well past the pilot stage.
This shift is showing up industry-wide, not just at Medius. Coverage of 2025 accounts payable trends points to more than half of companies expected to bring AI into their AP function, largely because rising operational costs are pushing teams to find efficiency gains beyond basic automation. Teams that wait on this tend to be the ones stuck at the $10.18 end of the benchmark range, or worse.
Put approvals on mobile
Giving approvers a mobile-friendly way to review and approve invoices removes the "waiting on someone's desk" bottleneck entirely and shortens the approval cycle without adding headcount.
Move to the cloud
Cloud-based AP platforms remove the IT maintenance burden of legacy systems and scale with invoice volume, which matters as much for a growing mid-market company as it does for an enterprise AP team. Cloud platforms also make it far easier to keep up with global e-Invoicing mandates, which are becoming a compliance requirement rather than a nice-to-have in a growing number of countries.
How to benchmark your own invoice processing costs
Start by calculating your actual cost per invoice: total AP labor cost, plus software and infrastructure cost, divided by invoice volume. Compare that number to the $2.36 to $10.18 industry range (and the $25-plus tail if you're still largely manual), and be honest about where the gap comes from, whether that's manual matching, slow approvals, or legacy systems.
A team at $10 per invoice and a team at $2 per invoice usually aren't separated by headcount or invoice complexity. They're separated by how much of the process runs without a human touching it. That's the number worth tracking quarter over quarter, not just at the start of a new AP initiative.
Ardent Partners' 2025 State of ePayables research found that Best-in-Class AP teams run at roughly 79% lower processing costs than their peers, which lines up with the gap in the benchmark data above. The takeaway isn't the exact number. It's that the gap is closable, and most of what closes it is process and technology, not headcount.
The fastest way to use these numbers is to run your own cost per invoice and processing time against the PO and non-PO benchmarks above. Then pick the single biggest driver behind your gap, whether that's paper, matching, approvals, or legacy systems, and fix that one first.
Ready to see what touchless invoice processing looks like in practice? Book a demo with Medius.
