Research question
Which evidence separates an invoice-processing capacity problem from an approval bottleneck?
What authoritative sources establish
The Federal Reserve's small-business payments research describes firms using multiple payment methods, while IRS recordkeeping guidance connects transactions to supporting records. Together, these sources show why a payable is not complete merely because an invoice arrived: evidence, approval, and payment control are separate events.
Operational analysis
Measure receipt-to-ready time separately from ready-to-approval time. Count missing purchase evidence, duplicate flags, disputed amounts, changed payment details, and reviewer minutes. The split identifies whether administrative preparation or decision latency dominates the queue.
Staffing boundary
Back-office staff can validate required fields, assemble support, and maintain the exception register. Vendor approval, bank-detail verification, accounting treatment, and payment release remain with accountable finance owners.
Conclusion
Measure receipt-to-ready time separately from ready-to-approval time. Count missing purchase evidence, duplicate flags, disputed amounts, changed payment details, and reviewer minutes. The split identifies whether administrative preparation or decision latency dominates the queue. This evidence supports a capacity decision only when the queue recurs and a named owner reviews exceptions.