When Standard SaaS Is the Wrong Choice for Accounts Payable Automation

by | Oct 9, 2026 | Accounts Payable

The short answer

Standard SaaS accounts payable tools are built around limited approval paths, defined entities, and finite business rules. They work well for specific use cases that were anticipated by the developer of the proprietary workflow engine. They stop working once a company needs more niche functionality: multiple approval paths by business unit, 3rd party system integrations, or a requirement that invoice data stay inside the organization’s own Microsoft 365 tenant rather than a vendor’s platform.

That gap shows up first in the numbers. The average invoice takes 9.2 days to process and costs $9.40, per Ardent Partners’ 2025 benchmarking of more than 200 AP professionals. Best-in-class, automated departments pay $2.78. For organizations with real process complexity, the gap is usually wider: 53% of AP professionals name invoice exceptions, not invoice volume, as their single biggest challenge.

The signals standard SaaS has hit its limit

Four conditions show up again and again in organizations that have outgrown a standard AP tool.

Multiple and Complex approval paths. A defined approval chain works for a single entity. Once a business has more than one subsidiary, department, or spending policy, invoices need to route differently by origin, without duplicating the whole workflow per business unit.

Integrations with 3rd Party Applications. Standard SAAS workflows are typically confined to the system in which they reside. That means they can’t query other applications to obtain data that will be used to dictate the workflow path..

Data that has to stay in a specific environment. Some organizations can’t accept a tool that copies invoice data into a separate, vendor-hosted database. The requirement is narrower: data has to stay inside the organization’s own Microsoft 365 tenant, under its own access controls.

An ERP the standard tool doesn’t really integrate with. A lot of “integration” in standard AP software means a nightly batch export. Real ERP integration means invoices post directly, in real time, for both PO and non-PO types, not a disconnected copy reconciled later.

Any one of these is manageable with a workaround. Two or more together, and the workarounds start costing more than the software was supposed to save. Exception rates for the broader AP population run around 22%, against roughly 9% at best-in-class organizations whose workflows were built to handle them.

What a better fit looks like

The alternative isn’t a bigger version of the same standard tool, and it isn’t a from-scratch custom build either. It’s a proven application already built for these conditions, configured to the organization’s workflow rather than forcing the workflow to fit the software.

EasyAP365, for example, captures invoices however they arrive, extracts data with built-in OCR, and posts approved invoices directly into the ERP in real time, for both PO and non-PO invoices. Approval routing runs on Microsoft Power Automate, so multiple approval paths by entity or department are a configuration choice, not a limitation. Because the application runs inside the customer’s own Microsoft 365 tenant, the data residency question has a direct answer instead of a vague one.

None of this requires reinventing accounts payable. It requires recognizing, earlier than most organizations do, that the requirement has moved past what a standard tool was built for.

FAQ

How do I know if my AP process is too complex for standard software?

This is difficult to answer as proprietary workflow tools break down in a variety of situations. Look for such things as one or more of these items together: multiple approval paths by entity or department, exception handling that needs to stay auditable, a requirement that data remain in your own Microsoft 365 environment, integration with 3rd party applications, or an ERP live integration as opposed to batch-sync only.

Is this just a company-size problem?

No. Invoice volume and process complexity are different variables. A single-entity company with one approval chain can have high volume and still be well served by standard SaaS. A smaller, multi-entity or regulated organization can outgrow standard software at relatively low volume.

What does “exceptions” mean in this context?

An exception is any invoice that doesn’t follow the default path: a price variance, a missing PO, a need to reference data in another system, a nonstandard approval requirement. In a standard tool, exceptions usually mean someone pulls the invoice out of the system to handle it manually, which is exactly where audit trails and controls break down.

Does moving off standard SaaS mean a custom build?

Not necessarily. A proven, configurable application occupies the middle ground. It already has the workflow engine, ERP integrations, and compliance groundwork built in, and gets configured to fit, rather than requiring a business to build and maintain that foundation itself.

Sources

    • Ardent Partners, AP Metrics That Matter in 2025, as reported by apexanalytix (March 2025)