If supplier invoices take up a meaningful part of your team's week, you have broadly three options: use the capture features in your accounting system, buy a dedicated accounts payable automation product, or have a custom workflow built. As a company that builds custom workflows, we recommend the first two more often than you might expect.
Here is how to decide.
Option 1: Built-in capture in your accounting software
Most cloud accounting systems now include some form of bill capture: forward an invoice to an address and a draft bill appears. Dedicated receipt and bill capture tools that integrate with them are also widely used, especially by bookkeepers.
Good fit when: you have one entity, a modest volume of invoices, few purchase orders, and you mainly need to stop typing.
Limits: little or no PO and receipt matching, basic approval workflows, limited control over coding rules and exceptions.
Option 2: A dedicated AP automation product
AP automation platforms add approval workflows, PO matching, vendor management and often payments on top of capture.
Good fit when: your accounting system or ERP is well supported by the product, your approval rules are fairly standard, and your volumes justify a per-invoice or per-user subscription.
Limits: you adapt your process to the product. Complex matching rules, several ERPs, invoices tied to operational data (shipments, jobs, properties), or an ERP the vendor supports poorly all reduce the fit. Pricing typically scales with volume, which matters as you grow.
Option 3: A custom workflow
A custom build combines an extraction service with validation, matching and approval logic designed around your process, posting into whichever systems you use.
Good fit when: your matching rules are unusual, you need to check invoices against data that lives outside the ERP, you run several entities or systems, or you have already tried a product and found yourself working around it.
Limits: higher upfront cost, and it needs an owner, either an internal team or a support plan.
A side-by-side view
| Factor | Built-in capture | AP product | Custom workflow |
|---|---|---|---|
| Upfront cost | Very low | Low to moderate | Moderate to high |
| Ongoing cost | Low | Scales with volume | Hosting, AI usage and support |
| PO and receipt matching | Limited | Standard rules | Your rules |
| Fit with unusual processes | Low | Medium | High |
| Time to start | Days | Weeks | 6–10 weeks |
| Who maintains it | Vendor | Vendor | You or your provider |
A simple decision guide
- Fewer than a few hundred invoices a month, mostly non-PO: start with built-in capture.
- Hundreds to thousands a month, standard PO matching, well-supported ERP: evaluate two or three AP products before anything custom.
- Matching against operational data, several systems, or a product that has not fit: a custom workflow is likely to pay back.
- Not sure: measure first. Count invoices per month, the share with POs, the share that need investigation, and the hours spent. The answer is usually obvious once those four numbers are known.
What each option really costs over three years
Purchase price is only part of the picture. Over three years, include set-up, subscriptions, internal time and the cost of the manual work that remains.
| Cost | Built-in capture | AP automation product | Custom workflow |
|---|---|---|---|
| Set-up | Low | Low to moderate | $12,000–$45,000 build |
| Ongoing software | Included or low | Per-invoice or per-user fees that grow with volume | Low platform and AI usage costs |
| Internal time | Most manual matching remains | Configuration and admin | Exceptions only |
| Fit to your rules | Standard | Configurable within limits | Exactly your rules |
For low volumes, the built-in option almost always wins. As volumes and complexity grow, per-invoice fees and remaining manual work shift the balance towards a product or a custom build. Our cost guide covers build pricing in more detail.
The hybrid option
Many of the projects we deliver are hybrids. The client keeps their capture tool or AP product for what it does well, and we build the parts it cannot do, such as matching carrier invoices to load records, or routing approvals based on data in a separate operational system. That often costs less than a full custom build and avoids replacing something the team already knows.
Questions to ask any vendor or provider
- What share of our invoices would go straight through, and how was that estimated?
- How are exceptions presented, and who handles them?
- What happens when a supplier changes their invoice layout?
- What are the total costs at our volume in three years?
- If we leave, what do we keep?
If you would like an independent view, including when the answer is a product rather than a build, our assessment covers it. You can also read how we approach invoice processing automation.