What’s the average cost of accounts payable?
Personnel cost (beyond just the invoice-touching staff)
This includes salaries, wages, bonuses, overtime, and benefits for everyone contributing to the process. Fringe costs also count here: employer contributions to retirement funds, workers' comp, insurance, and pension plans. This is usually the single largest component and the one most easily underestimated.
Overhead
Indirect costs such as office space, utilities, and general administrative support are attributable to the AP function.
Real hidden expense sits
This bucket covers everything that isn't a clean line item but is still a direct consequence of how AP runs:
- Error correction
- Missed early payment discounts
- Late payment penalties
- Duplicate or fraudulent payments
- Compliance and audit costs
- Training and onboarding
- Outsourced costs
Part of APQC's total-cost framework includes any part of your AP process (data entry, scanning, exception handling) handled by a third party or shared service centre rather than by in-house staff.
| Region | Manual cost per invoice (approx.) |
|---|---|
| Global (2025) | $9 |
| Australia | AU$28 |
| United Kingdom | £15 (up to £50 for complex/error-prone processes) |
Ardent Partners, ATO, DocuClipper
How to calculate cost per invoice
The question now arises: how can you calculate the cost per invoice for your business? The formula is very simple:
Cost per invoice = AP processing costs in total ÷ Total number of processed invoices
For example, suppose your company’s total AP processing costs for the quarter break down is as follows:
- Labour costs: AU$110k (£55kk)
- Technology & infrastructure: AU$15k (£7.5k)
- Payment processing fees: AU$4k (£2k)
- Other ‘hidden’ cost (late payment penalty): AU$1k (£500)
Then your total AP processing costs = AU$130k (£65k)
During the same quarter, the company processed 5000 supplier invoices.
Cost per invoice = AU$130k ÷ 5k = AU$26 (£13)
So your company spends around AU$26 (£13) to process each invoice.
Manual vs automated invoicing cost
Benchmarks tell you the average cost per invoice, but you process hundreds of invoices every month. The gap between manual and automated processing doesn't stay flat as volume grows, it multiplies.
The table below applies the per-invoice benchmarks already covered for both AU and UK across four common volume tiers, so you can see roughly what’s the difference in cost between manual and automated AP and how much you can save monthly and annually with automated AP.
United Kingdom
Manual AP: 1 invoice = approx. £15
Automated AP: 1 invoice = approx. £2
| Invoice volume | Manual AP cost (£) | Automated AP cost (£) | Monthly savings with automated AP (£) | Annual savings with automated AP (£) |
|---|---|---|---|---|
| 250 | 3,750 | 500 | 3,250 | 39,000 |
| 500 | 7,500 | 1,000 | 6,500 | 78,000 |
| 1,000 | 15,000 | 2,000 | 13,000 | 156,000 |
| 2,000 | 30,000 | 4,000 | 26,000 | 312,000 |
Australia
Manual AP: 1 invoice = approx. AU$28
Automated AP: 1 invoice = approx. AU$4
| Invoice volume | Manual AP cost (AU$) | Automated AP cost (AU$) | Monthly savings with automated AP (AU$) | Annual savings with automated AP (AU$) |
|---|---|---|---|---|
| 250 | 7,000 | 1,000 | 6,000 | 72,000 |
| 500 | 14,000 | 2,000 | 12,000 | 144,000 |
| 1,000 | 28,000 | 4,000 | 24,000 | 288,000 |
| 2,000 | 56,000 | 8,000 | 48,000 | 576,000 |
What's driving the cost of manual accounts payable?
4 factors do most of the work, and the cost of each scales with volume rather than remaining flat.
Labour and data entry
How: Every invoice still needs a person to key in the data, chase down an approval, and match it against the purchase order.
Why it compounds: This cost multiplies as volume increases. Twice the invoices means roughly twice the labour hours.
Errors
How: Manual entry creates the conditions for duplicate payments and wrong amounts to leave your business.
Why it compounds: An error isn't a one-off cost. It creates downstream work like correcting the ledger, investigating what happened, and the audit exposure that comes with it, so one mistake can cost several times what the original entry would have.
Late-payment penalties
How: Manual processing means longer approval chains, and longer approval chains mean payment deadlines get missed.
Why it compounds: This is usually the cost leadership that notices first, because it's the most visible. A late fee sits as a hard number directly on the vendor invoice, impossible to ignore or explain away.
Missed early-payment discounts
How: The same long approval times that cause late fees also cause discount windows to close before an invoice is even approved.
Why it compounds: Unlike a late fee, there's no line item for a discount you didn't take. But it happens every month on every eligible invoice, so a small percentage missed compounds into a meaningful annual figure once you actually total it up.
Calculate your savings with AP automation
Use our free savings calculator to find out how much you can save using AP automation based on your invoice volume.
What can you do next?
- Start by running your own cost per invoice using the formula covered earlier.
- See what automation would actually change for your specific volume and process, based on your invoice count.
- Look at AP automation providers. Use our free RFP template to find the most suitable provider for your business
- Conduct a free trial before you commit
Final Thoughts
The real question isn't whether manual AP is costing you money. The benchmarks and drivers above confirm it is. It's whether you know your own number, and what you're prepared to do once you have it.
Across every region we looked at, the pattern holds: manual invoice processing costs several times more than automated processing. This gap doesn't stay fixed. It grows with volume.
The formula is simple: total AP processing costs divided by invoices processed. What's harder is being honest about everything that belongs in “total cost”.
Once you've run that number for your own organisation, the comparison against automated benchmarks stops being an industry statistic and starts being a business case with your name on it.
