What is payment velocity and how does it predict collection risk?

Payment velocity is a customer-level metric for how quickly a specific customer actually pays, not how quickly they're supposed to pay under your terms. A customer on net-30 with an average velocity of 45 days is systematically slow. A customer on net-30 with a velocity of 28 days is reliable. The distinction matters because customers rarely change their payment behavior abruptly. Someone who has always paid in 45 days will keep paying in 45 days. A customer who suddenly jumps from 28 days to 65 days is signaling a possible cash flow problem or a change in their business.

Tracking velocity by customer needs at least a few months of invoice history. For each paid invoice, calculate days from invoice date to payment receipt. Average those across the customer's recent history and compare to your stated terms. An average significantly above terms tells you the customer is a chronic late payer, and you can adjust credit strategy accordingly: tighter credit limits, shorter terms, or required deposits for new projects.

Payment velocity is also useful at the portfolio level. If your average collection velocity across all customers climbs from 35 days to 42 days over three months, it may indicate market-wide liquidity stress in your customer base, a change in your collections process, or concentration risk in a single large slow-paying customer. Monitoring it monthly alongside DSO is an early warning system for collections problems before they show up as cash shortfalls.