How to Spot a Revenue Leak Between Billing and Collections

The revenue leak between billing and collections shows up as a widening gap between what you invoiced and what you’ve collected — and the earliest signal is your days-to-collect creeping up while aged receivables pile in the 60- and 90-day columns. By the time it’s obvious in the bank balance, the money has been sitting uncollected for months. Spotting it early means watching three numbers, not waiting for the year-end write-off.

The three signals

• Days to collect is rising. The time between sending an invoice and getting paid is the most direct measure of cash velocity. A creeping average means collections are slipping before anything gets written off.
• AR aging is bunching in the later columns. Watch the shape of your accounts receivable aging, not just the total. Balances drifting past 60 days rarely improve on their own.
• Collection rate is diverging from realization. If you’re billing well but collecting less of it, the leak is downstream of the invoice — in follow-up, payment friction, or disputes.

Why the leak hides

The leak between billing and collections is hard to see because the two live in different places for most firms — billing in one system, cash in another, follow-up in someone’s memory. The gap between them is exactly where lockup builds: work performed, invoiced, and then stranded. This is the difference between a billing problem and a revenue operations problem. The leak lives in the handoff between billing and collections — which is why no one looking at either system alone tends to catch it.

How to close it

Make the handoff visible. When billing and collections run on one connected view, aged balances surface while they’re still collectable, follow-up can be triggered by rules instead of memory, and payment friction (paper checks, no online option) gets designed out. The firms that collect fastest aren’t chasing harder — they’ve removed the gap where the money used to get stuck.

Frequently asked questions

What is lockup at a law firm? Lockup is work that’s been performed but not yet collected — unbilled time plus unpaid invoices. It’s a direct measure of cash tied up in the gap between doing the work and getting paid.

What’s a healthy days-to-collect? Industry cycles often run 45–60 days; faster-collecting firms are well under that. The trend matters as much as the number — a rising average is an early leak signal.

How do I improve my collection rate? Invoice promptly, offer online payment, and make aged receivables visible early so follow-up happens before balances go stale.