The AU$27.67 figure is the one most businesses find when researching AP automation costs in Australia. It comes from the ATO’s eInvoicing value assessment, which uses a 2016 Deloitte Access Economics estimate of what it costs to process a PDF invoice. That cost is shared between the business sending the invoice and the one paying it. The ATO gives 60% of it to accounts payable by default and says the split can vary substantially, so the payer’s share of the cost per invoice is about AU$16.60. At 100 invoices a month, that’s about AU$1,660 in processing labour. Annualised: roughly AU$19,900.
This is the number that makes the automation business case arithmetic look straightforward. AP automation for 100 invoices a month costs from about AU$70 a month (Pulsify’s Get Control plan is AU$69 for 100 documents). Prices vary by platform. If it cuts processing labour by 60%, it saves about AU$1,000 a month on those numbers, so it covers its own cost from the first month. Our invoice processing cost calculator applies the benchmark to your own volume so you can see where your business lands. The best invoice processing automation software for Australia shows which platforms actually deliver that reduction.
But the figure only counts staff time. The ATO builds it from average step times for receipt, validation, review and approval, plus generic rates for exceptions such as contested payments and data entry errors. It doesn’t count money that leaves the business by mistake. In manual AP, more of that happens than you’d expect.
What does the benchmark not include?
An invoice that needs to be rekeyed because the first entry had the wrong supplier selected: another 10-15 minutes. A duplicate invoice that cleared approval and was paid, discovered six weeks later when the supplier sent a statement: recovering the credit note, processing the reversal, updating the ledger - typically 45 minutes to two hours, plus whatever the supplier’s credit terms say about how the overpayment gets applied. A GST coding error found at BAS time: correcting the journal, lodging the amendment, potential ATO correspondence - variable, but never less than an hour.
The ATO’s model allows 5 minutes to fix a data entry error and 20 minutes to clarify a contested payment. The fixes above take far longer. None of them count the money that went out the door. Our full guide to automating your AP process covers how automation shrinks both the time and the losses.
For a business processing 100 invoices a month from 30 active suppliers, we assume a correction rate of 2 to 4%: two to four invoices a month where something needs fixing after the bill was posted. That range is an assumption we use, not a measured rate. The ATO’s model uses 3.6% for data entry errors alone. Correction rate sits alongside exception rate among the accounts payable KPIs worth measuring once you are handling hundreds of invoices a month, because it exposes cost the invoice count alone hides. At an average of 60 minutes per fix, less the 5 minutes the ATO’s model already allows for each one, that’s about 1.8 to 3.7 hours a month in correction work. At an example loaded rate of AU$45 an hour, the same rate our KPI guide uses, that’s about AU$80 to 165 a month the headline figure doesn’t capture.
The error types that create financial exposure
Some AP errors cost only time. Others have direct financial consequences.
Duplicate payments cost money, not just time. A supplier submits an invoice twice - different reference numbers, slightly different formatting - and both are processed and paid. At 100 invoices per month from 30 suppliers, a 1% duplicate rate means one duplicate payment per month on average. If the average invoice value is AU$4,000, that’s AU$4,000 in overpayment. Recovery depends on the supplier’s cooperation and can take weeks. Some overpayments get applied to future invoices without notice, creating reconciliation problems months later.
GST coding errors accumulate quietly. An invoice miscoded as GST-inclusive when it’s GST-free overstates the input tax credit claimed on that BAS. Across 100 invoices per quarter, even a 3% miscoding rate means three invoices per quarter with incorrect GST treatment. When a business goes through a tax review, a pattern of incorrect input tax credit claims creates a liability including the overclaimed amount, interest and potentially penalties.
What fraud exposure does manual processing create?
Payment redirection fraud exploits the gap between invoice receipt and payment approval. An attacker sends an invoice or bank detail change request impersonating a known supplier. In a manual AP process, the check that would catch it - comparing the bank account number on the incoming invoice against the account stored for that supplier - depends on the accounts payable officer remembering to do it while processing 80 other invoices that month. Under time pressure, the check gets skipped. The payment goes to the wrong account. This is the AP fraud vulnerability that manual workflows leave wide open.
The ACCC’s National Anti-Scam Centre reported AU$166.8 million in payment redirection losses across Australia in 2025. A single successful fraud at AU$15,000 adds AU$15,000 to the real cost of manual AP for that business that year, plus the staff time investigating and attempting recovery. BECS payments are processed quickly. Reversal isn’t guaranteed once funds have moved.
The honest total
For a 20-person Australian business processing 100 invoices per month:
The payer’s share of the ATO estimate gives about AU$1,660 a month in direct processing labour, roughly AU$19,900 a year. Add correction labour at a 3% rate, less the ATO’s own allowance for data entry fixes: about AU$125 a month at AU$45 an hour. Add duplicate payment exposure: one duplicate a month at AU$4,000 average value with 75% recovered is about AU$1,000 net loss. Add fraud exposure, amortised conservatively: material, but highly variable.
The visible, calculable costs run to roughly AU$2,800 a month before fraud. The duplicate losses are bigger than the extra labour. Fraud exposure is harder to quantify in advance, but the ACCC data makes clear it isn’t hypothetical.
AP automation for 100 invoices a month costs from about AU$70 a month. Pulsify’s Get Control plan is AU$69 a month for 100 documents. Prices vary by platform. If automation cuts direct processing labour by 60 to 70%, that’s about AU$1,000 to AU$1,160 a month back, or about AU$12,000 to AU$13,900 a year. For a comparison of the available platforms, see our guide to the best AP automation software in Australia. Take off AU$828 a year for a AU$69 plan and the net saving on processing labour alone is about AU$11,100 to AU$13,100 a year. That assumes one document per invoice, the ATO’s default 60/40 split and that the hours saved are hours you would otherwise pay for. It’s before counting prevented duplicate payments and fraud exposure.
The business case for automating AP isn’t complicated. It’s usually presented as a time-saving argument, which undersells the error and fraud prevention components - and those are often where the more significant financial exposure actually sits. We work through the full numbers for a typical mid-sized operation in the ROI case for AP automation at a 15-person Australian business, where a single AP officer carries all of this exposure alone. The comparison of manual approvals versus automated workflows in high-volume finance teams goes deeper into the control differences at 50-plus invoices per week, where the approval step itself degrades from a control function into a throughput function. For businesses at the lower end of the volume scale, the AP software guide for small businesses at 10-50 invoices a month covers what to look for and when native Xero or MYOB tools are genuinely sufficient.
Sources: ATO - Peppol eInvoicing value assessment: cost calculations · ACCC National Anti-Scam Centre - Targeting Scams Report 2025
Further reading: Best AP Automation Software Australia 2026 · What a Modern AP System Needs to Do · AP Automation: The Business Case for a 15-Person Business