Accounts Payable

Accounts payable refers to the money a business owes to its suppliers for goods and services received but not yet paid. The term covers both the outstanding balances recorded on the balance sheet and the internal process used to receive, validate, code, approve, and pay supplier invoices.

In practice, accounts payable is one of the most operationally intensive parts of running a business. Invoices arrive by email, supplier portal, and post. Each one needs to be checked against what was ordered and delivered, coded to the correct accounts in the accounting system, approved by the right person, and paid within the agreed terms. Each step involves judgment calls, and each step is a potential failure point.

How the AP process works

A complete AP process follows five stages. The first is invoice capture: the invoice arrives and the relevant data is extracted, either manually or through automated software. The second is coding: each line item is assigned to the correct account in the chart of accounts with the correct GST treatment. The third is validation: the invoice is checked for accuracy, duplicates, and signs of fraud. The fourth is approval: the coded and validated invoice is routed to the correct approver based on the amount, supplier, and cost centre. The fifth is posting and payment: the approved invoice is recorded in the accounting system and paid within terms.

In businesses managing AP manually, each of these steps happens through a combination of email forwarding, spreadsheet tracking, and manual data entry into Xero or MYOB. At low invoice volumes, this is manageable. At higher volumes, the manual approach becomes the primary source of errors, late payments, and fraud exposure.

The financial risk in accounts payable

The AP process is one of the most targeted areas of business fraud in Australia. Payment redirection fraud, duplicate invoice fraud, and phantom vendor schemes all operate through weaknesses in AP controls. The Australian Competition and Consumer Commission reported AU$152.6 million in business email compromise losses in 2024, most of which entered through AP processes that lacked adequate validation and approval controls.

Beyond fraud, accounts payable affects cash flow directly. Paying invoices earlier than required ties up working capital unnecessarily. Paying invoices late damages supplier relationships and can trigger late payment interest charges. The timing of payments, managed deliberately, is a working capital lever. Managed poorly, it becomes a liability that affects both the balance sheet and supplier trust.

AP compliance in Australia

Australian businesses face AP-specific compliance requirements that add to the operational complexity. Every supplier invoice paid above a certain threshold requires the supplier's ABN. Payments made to suppliers without an ABN require 47 percent withholding tax to be deducted and remitted to the ATO. GST treatment varies across invoice types: standard taxable supplies, GST-free supplies, input-taxed supplies, and deferred GST on imported goods each require different coding in the accounting system. These requirements make accurate AP coding a compliance obligation, not just a bookkeeping preference.

For businesses on Xero or MYOB, the accounting system handles the final recording step but does not manage the upstream process. Invoice capture, coding, validation, and approval all sit outside the accounting system and require either manual effort or a dedicated AP automation platform to handle correctly at volume.

When manual AP becomes a problem

The inflection point where manual AP becomes a meaningful risk and cost problem typically occurs around 50 invoices per month. Below that threshold, a bookkeeper can manage the process manually with acceptable accuracy. Above it, the time cost of manual processing, the risk of coding errors accumulating across hundreds of invoices, and the fraud exposure from informal approval processes start to outweigh the cost of automation. Australian businesses processing more than 100 invoices per month that still rely on email-based approvals and manual coding are carrying a risk that is measurable and preventable.