Automating invoice processing in a small business
By Keith Hamilton · · 5 min read
In many small businesses, supplier invoices still arrive by email, get opened one by one, keyed into the accounts and chased round for approval. It works, but it is slow, it depends on one or two people, and mistakes are easy to make. This guide explains how automating invoice processing works in practice, where a person should stay involved, and what to check before you start.
What does automating invoice processing actually mean?
It means letting software handle the repetitive steps between an invoice arriving and it being ready to pay. Most set-ups follow the same basic flow:
- Capture. The invoice is collected from an inbox or upload folder and the key details are read from it.
- Matching. Those details are checked against what you expected, such as a purchase order, a delivery note or a supplier's agreed price.
- Approval. The invoice is routed to the right person to approve, based on simple rules.
- Posting. The approved bill is created in your accounting system, ready for payment.
Anything that does not fit the rules is set aside as an exception for a person to look at. That last part matters more than any of the others.
How invoice capture works
Modern tools can read invoices in different layouts and pull out the supplier name, invoice number, date, amounts, VAT and line items. AI has made this much better at handling invoices it has not seen before, but it is still not perfect.
To get reliable capture:
- Use one dedicated email address for supplier invoices and ask suppliers to send to it.
- Keep a clean, current list of suppliers and their details in your accounting system.
- Check a sample of captured invoices by hand in the early weeks, so you know how accurate it really is with your suppliers.
Poor-quality scans, handwritten notes and invoices with many pages of line items are the usual sources of errors.
Matching invoices to orders and deliveries
Matching is where much of the time saving comes from. If you raise purchase orders, the system can compare the invoice with the order and, where you record them, the goods received. If everything agrees within a tolerance you set, the invoice can move straight on.
If you do not use purchase orders, you can still match against expected patterns, such as a regular monthly charge from the same supplier for a similar amount. The rules do not need to be clever. They need to be clear and agreed.
Setting up approvals that people will follow
Approval rules should reflect how your business already works, written down. For example:
- Invoices below a certain value from known suppliers go to the budget holder.
- Invoices above that value also need a director.
- Invoices from a new supplier always need a second check.
Keep the rules few and simple. Complicated approval chains tend to stall, and then people work around them by email, which defeats the point.
Why a person should always handle exceptions
Automation typically removes somewhere between a third and two thirds of a repetitive task, not all of it. The remaining share is mostly exceptions: a price that does not match, a missing purchase order, a duplicate, a credit note, or bank details that have changed.
These are exactly the cases where judgement matters, and where mistakes cost money. A change of supplier bank details, in particular, should always be confirmed by a person through a separate, known contact route before anything is paid. Never let an automated process approve or act on a bank detail change by itself.
A good set-up makes exceptions easy to see, explains why each one was flagged, and keeps a record of who resolved it and how.
Connecting to your accounting system
The automation is only useful if it fits the system your finance team already uses. Before choosing a tool, check:
- Whether it connects directly to your accounting package, rather than relying on exported spreadsheets.
- Whether it creates bills with the right nominal codes, VAT treatment and supplier records.
- Whether it keeps a link to the original invoice image, so you have an audit trail.
- What happens if the connection fails, and who gets told.
Start by running the new process alongside the old one for a short period. Compare the results before you switch fully.
Data protection and record keeping
Invoices often contain personal data, especially from sole traders and individual contractors, and may include names, addresses and bank details. UK GDPR applies to that data. You need a lawful basis for processing it, you should keep only what you need, and you should know where any tool stores and processes it.
If the processing is likely to be high risk, carry out a data protection impact assessment. The ICO publishes guidance on AI and data protection that is worth reading before you start. Remember too that you still need to keep proper financial records, so check that the tool retains invoices and approvals in a form your accountant can use.
Frequently asked questions
Is invoice automation worth it for a small business?
It can be, if you handle a steady volume of supplier invoices and someone spends several hours a week on them. Work out the time spent today and the value of removing part of it before you commit. For a business with only a handful of invoices a month, a tidy manual process may be enough.
Can AI approve invoices on its own?
It can apply rules you set, such as passing a fully matched invoice from a known supplier on for payment. Decisions outside those rules, and anything unusual, should go to a person. Keeping people on exceptions is what makes the process safe.
What should I automate first?
Capture and posting are usually the easiest places to start, because they save keying time without changing who approves what. Once that is reliable, add matching and approval routing. Building in stages lets you check accuracy at each step.
Where Forwardcycle fits
Our cost reduction service helps small and medium businesses map their invoice process, decide what to automate and keep the right checks in place. To see where it might fit your business, take the free AI Readiness Assessment or arrange a free call.