Approval Cycle Time

Approval cycle time is the elapsed time between an invoice being routed for approval and receiving the final required approval that allows it to proceed to payment. It is a component of total invoice cycle time, but is often the largest component in businesses where processing and coding are automated but approvals still depend on individual managers reviewing and acting on items in their queue. Approval cycle time is measured in hours or business days, and should be tracked by approver, approval tier, and invoice category to identify where bottlenecks are concentrated.

In most manual and semi-automated AP environments, approval cycle time is the primary bottleneck to payment performance. The capture, coding, and validation stages can be completed in minutes or hours with modern AP software. But an invoice requiring approval from a busy operations manager who reviews their AP queue once a week may wait four or five business days regardless of how efficient the upstream processing was. That delay consumes most of the available time window in a 30-day payment term and eliminates any early payment discount opportunity.

What drives long approval cycle times

The most common cause of long approval cycle times is poor visibility. Approvers who receive invoice approval requests by email, buried among other operational email, frequently delay or miss approvals not from unwillingness to approve but from the approval request being invisible in a crowded inbox. Approvers who have dedicated approval queues in an AP system -- where approvals are presented clearly with the relevant invoice information, supplier context, and any purchase order match details -- consistently approve faster because the task is visible and the information needed to make the decision is immediately available.

Multi-stage approval requirements for higher-value invoices add cycle time by design, but the total cycle time impact depends on how long each stage takes. A two-stage approval where each approver acts within 24 hours adds two days to cycle time. A two-stage approval where the second approver is waiting to be prompted by the first, and the first takes four days, adds five to six days. Automated routing that simultaneously notifies the second approver when the first approves -- rather than sequential notification -- removes the wait-time compounding that makes multi-stage approvals slow.

Approver unavailability -- leave, travel, illness -- is a legitimate cause of approval delay that requires a mitigation process. Delegation rules that automatically route approvals to a nominated delegate when an approver is marked unavailable prevent approval queues from freezing during absences. Without delegation rules, invoices can sit in an absent approver's queue for the duration of their leave, causing late payments for every due date that falls in that window.

The link between approval speed and fraud detection

Approval cycle time has a less obvious but significant relationship with fraud detection quality. When approvals are urgent because payment deadlines are approaching, approvers under time pressure are more likely to approve invoices without adequate scrutiny. "Can you approve this quickly, it's overdue" is a phrase that bypasses normal review in many AP environments -- and it is also a social engineering technique used to push fraudulent invoices through approval.

Reducing approval cycle time removes the urgency pressure that leads to cursory approvals. When an invoice arrives in an approver's queue three weeks before the payment due date, there is time to ask questions about the supplier, check against what was ordered, and push back on anything unusual. When it arrives three days before the due date, the pressure to approve fast competes with the instinct to scrutinise. Faster processing upstream creates better conditions for quality approvals, not just faster ones.