The AP numbers that matter

1. The ten KPIs

Each measure answers a different question about your invoice process. Together they show what AP costs, how often it goes wrong, and what that does to cash and suppliers.

• Cost and productivity: cost per invoice, invoice cycle time, invoices per AP person
• Process quality: PO linkage, exception rate, straight-through rate
• Working capital and suppliers: supplier e-enablement, days payable outstanding, early payment discounts taken, on-time payment rate

The guide sets each one against benchmarks from Ardent Partners, APQC and The Hackett Group, and shows how the numbers move each other.

2. Where AI fits

AI is arriving in AP, but slowly. According to Ardent Partners, 58% of AP teams are using or piloting AI, but only 1% have it fully embedded. 61% say data quality is the biggest barrier.

That points back upstream. Clean POs and supplier records make automation work. Messy ones just make mistakes faster.

3. Three decisions that cost nothing

1. No PO, no commitment. Make a purchase order a condition of spending, enforced when the order is placed, not when the invoice arrives.
2. Give supplier data an owner. One named person, a regular review, and bank details checked before they change.
3. Ask for the numbers. Get your team to baseline the ten measures. You can’t close a gap you haven’t measured.

Benchmarks: Ardent Partners, AP Metrics that Matter in 2026 (global survey of 194 AP, finance and P2P leaders, March to May 2026); APQC; The Hackett Group. Figures in US dollars, as published.