Start with AP leakage and approval drag
Invoice routing creates real cost when approvals stall, vendors chase status, GL coding is inconsistent, PO context is missing, or duplicate invoices slip through. The AI decision is whether AP needs better investigation support or a controlled routing path that respects the approver matrix.
OECD SME AI adoption research emphasizes practical use cases and readiness, which fits finance operations. Choose one invoice class first, such as recurring vendors, PO-backed invoices, or high-exception non-PO spend, and define the controls before choosing Copilot or a custom workflow.
Use Copilot for investigation, custom AI for approval control
Copilot can summarize invoice context, draft approver or vendor messages, and help AP staff investigate exceptions inside Microsoft 365 content. Microsoft's privacy and architecture guidance makes it relevant where the reviewer already has permission to see the supporting documents.
Custom AI is warranted when the workflow must match vendors and POs, suggest GL coding, enforce approval thresholds, flag duplicates, log exceptions, and update ERP or AP systems. NIST controls should define reviewer authority and monitoring; CISA's AI data-security guidance matters because invoice workflows touch vendor, bank, financial, and purchasing data.
Prove routing quality before touchless volume
Deloitte's 2026 AI research reinforces that value comes from production adoption. In AP, that means the pilot should prove controlled routing quality before claiming broad automation.
Measure touchless routing rate, exception accuracy, approval-cycle time, coding corrections, duplicate prevention, and audit-trail completeness. Copilot is enough when AP only needs faster context. Build the custom path when the company needs system updates, threshold enforcement, and evidence that finance controls held.
