What does it cost to process an invoice? AP benchmarks every finance team should know

The quick answer? According to Ardent Partners’ 2025 Accounts Payable Metrics That Matter report, the average cost of processing a single invoice is $9.40, with best-in-class organizations bringing that down to $2.78 per invoice. Much of that gap comes down to how invoices are received, approved, and paid — including how exposed a business is to fraud and manual error along the way.

If you don’t know your own cost per invoice, you’re not alone. But it’s one of the most useful numbers you can track, because it tells you exactly how much friction (and risk) is baked into your current payment process.

Here’s what the research says, and what it means for your AP team.

What is cost per invoice, and why does it matter?

Cost per invoice is the total expense of getting a single invoice from receipt to payment — labor, systems, overhead, error correction, and everything in between. It’s one of the core benchmarks that establish what “average” and “best-in-class” actually look like.

Once you know your own number, you can compare it against these benchmarks, track whether it’s improving, and build a real case for where to invest next.

The real cost of manual, paper-based AP

If your AP team is still relying on paper checks, manual data entry, and back-and-forth email approvals, the cost — and the time — adds up fast.

According to Ardent Partners’ 2025 report, the average invoice takes 9.2 days to process, with exception rates averaging 14% across organizations. By comparison, best-in-class organizations process invoices in just 3.1 days, compared to 17.4 days for others, and best-in-class teams maintain a 9% invoice exception rate versus 22% for the industry average. 

Every invoice that turns into an exception — a mismatched PO, a missing field, a disputed charge — needs a person to step in and resolve it. The more of those exceptions your process generates, the more your true cost per invoice climbs above that $9.40 average.

Fraud is a growing part of the equation

Cost isn’t the only thing separating average AP operations from best-in-class ones. AP leaders face significant hurdles including increasing fraud risk alongside high exception rates and lengthy approval workflows. 

That fraud exposure is closely tied to payment method. According to the 2026 AFP Payments Fraud and Control Survey Report, checks were the most frequently reported payment method subject to fraud in 2025 (58% of organizations), followed by ACH debits (30%) and wire transfers (25%). Paper checks remain one of the easiest payment types to compromise, since the routing number, account number, and signature needed to alter or counterfeit one are printed right on the document. When check fraud happens, resolving it isn’t quick — it typically means stop-payments, reissued checks, and closed-and-reopened accounts, all of which add hidden labor cost on top of the per-invoice number above.

This is a big reason more finance teams are shifting supplier payments to virtual cards. Instead of a static account number that’s exposed on every transaction, a virtual card generates a unique, single-use number for each payment. If that number is ever compromised, there’s no reusable account data for a bad actor to exploit. Virtual cards also give AP teams more control from the start — setting spend limits, restricting a card to a specific vendor, and getting real-time visibility into transactions instead of waiting for a monthly statement to catch a problem.

Why the gap between average and best-in-class keeps widening

Part of the story here is technology adoption. Ardent Partners’ research found that 75% of AP departments now use some form of AI or automation, which is helping to streamline operations and reduce manual effort. But adoption is uneven — many organizations are automating pieces of the process (like invoice capture) while still paying suppliers the old way, by check. 

That matters because the payment step is where a lot of residual cost and risk still lives. Digitizing invoice capture doesn’t eliminate fraud exposure or reconciliation headaches if the payment itself is still a mailed check. Closing that gap — from invoice receipt all the way through to payment — is where the biggest jump from “average” to “best-in-class” tends to happen.

What counts as a “good” cost per invoice?

Using Ardent Partners’ benchmarks as a reference point:

• Above $9.40 per invoice: Above the industry average — worth examining where exceptions, manual approvals, or check-related overhead are driving up cost.
• Near $9.40 per invoice: In line with the average, with likely room to close the gap toward best-in-class performance.
• Near $2.78 per invoice: Best-in-class territory, typically reflecting a more automated, more digital end-to-end process.

To find your own number, add up your team’s fully loaded labor cost plus any systems or overhead tied to AP, then divide by your monthly invoice volume. It’s a simple exercise, but the result is often eye-opening.

A more secure, more efficient way to pay

Cost per invoice is a reflection of how secure, reliable, and vendor-friendly your payment process actually is. Slow, paper-based payments mean more fraud risk, more exceptions, and more strained supplier relationships. Digital payments — like virtual cards — offer tighter security through single-use card numbers, more control over spend, and the added benefit of earning rebates on the spend you’re already generating, instead of just absorbing the cost of paying your bills.

Frequently asked questions

What is the average cost to process an invoice?
According to Ardent Partners’ 2025 Accounts Payable Metrics That Matter report, the average cost of processing a single invoice is $9.40, with best-in-class organizations at $2.78 per invoice.

How long does invoice processing typically take?
The average time it takes to process a single invoice is 9.2 days. Best-in-class organizations process invoices in just 3.1 days, compared to 17.4 days for others, according to Ardent Partners’ research.

What is an invoice exception rate, and why does it matter?
An exception is any invoice that requires manual intervention before it can be paid — due to a mismatch, missing data, or dispute. Top-performing AP teams maintain a 9% invoice exception rate, significantly lower than the industry average of 22%, and fewer exceptions generally mean a lower cost per invoice.

Why are paper checks riskier than digital payments?
Checks carry the account and routing numbers needed to alter or counterfeit them right on the document, and resolving check fraud requires significant manual cleanup — stop-payments, reissued checks, and account changes.

How do virtual cards help reduce invoice processing costs and risk?
Virtual cards replace static account numbers with single-use numbers for each transaction, reducing fraud exposure. They also give finance teams real-time visibility into spend, custom controls like vendor restrictions and spend limits, and the potential to earn rebates on supplier payments.

For more insights and updates on corporate payments, check out:

• Your guide to virtual card rebates
• How to create an anti-fraud culture
• 2026 business payment trends

Learn more about how WEX payment solutions can be tailored to your business, so you can accelerate and streamline operations while creating lasting growth and success for your organization.

The information in this blog post is for educational purposes only. It is not legal or tax advice. For legal or tax advice, you should consult your own legal counsel, tax, and investment advisers.

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