AP Metrics a PE Operating Partner Should Ask Portfolio CFOs to Report Monthly

1. Invoice cycle time: average days from receipt to approval and to payment. 2. Cost per invoice: fully loaded cost to process an invoice. 3. Electronic payment rate: share of payments made electronically. 4. Exception rate: share of invoices requiring intervention. 5. Aging and overdue: open invoices by age and any overdue. 6. Discount capture: early-payment discounts won versus available. 7. Days payable outstanding: cash and working-capital measure.

Cycle time and cost per invoice are the core efficiency measures. Invoice cycle time, the average days from receipt through approval to payment, shows how fast the AP process moves, and a long or rising cycle time signals a bottleneck. Cost per invoice, fully loaded, shows how efficiently the operation runs, and high cost points to manual effort that automation could reduce.

Reported monthly across the portfolio, these two reveal which companies process efficiently and which carry excess manual cost. They are often the metrics that surface the clearest value-creation opportunities, because a company with slow, expensive AP usually has room to improve through process and automation.

Electronic payment rate and exception rate speak to modernization and quality. The share of payments made electronically shows how far a company has moved off paper checks, which affects cost and fraud exposure. The exception rate, the share of invoices needing intervention, reveals process and data quality, since a high rate signals upstream problems consuming the team's time.

Aging and overdue invoices round out the control picture. Open invoices by age, and any overdue, show whether the company is paying on time and where late-payment risk sits. Together these metrics tell the operating partner whether a company's AP is controlled and clean or strained and error-prone.

Discount capture and days payable outstanding are the cash metrics. Early-payment discount capture, won versus available, shows whether the company is realizing a cash benefit or leaving it on the table. Days payable outstanding shows the working-capital posture, though it should be read alongside discount capture, since paying early to capture discounts and extending terms to hold cash pull in opposite directions.

Comparability is what makes the whole set useful. A metric defined differently at each company cannot be compared, so the operating partner should standardize the definitions, not just the list. With consistent definitions, the metrics let the partner benchmark companies against each other, spot outliers, and confirm that reported improvements are real. A portfolio CFO who reports these with the underlying drivers can bring a clear, quantified picture to the operating partner rather than raw numbers without context.

Stampli gives each company real-time operational visibility into its AP process, including in-flight invoices, approvals, aging, and exceptions, which are the operational inputs behind several of these metrics. Because the process runs in one platform, the underlying data is consistent rather than assembled by hand.

Across a portfolio, a standardized AP platform supports consistent definitions, since the same workflow and the same measures apply at each company even when the ERPs differ. That consistency is what makes the metrics comparable across the portfolio rather than defined differently at each company.

Because every action is captured in an immutable audit trail and the ERP remains the system of record for the financials, the metrics rest on a traceable process and authoritative numbers. Stampli supports the operational measurement, while the ERP holds the financial figures the metrics draw on.