How to reduce billing leakage.

Billing leakage is the gap between the value of work your team recorded and the cash that actually landed in the bank. It shows up in four places — and they leak in roughly that order of size for most small firms.

Before you do anything, get a baseline number. The Billing Leakage Calculator gives you realisation, collection, and total leakage £ from four monthly figures. The billing leakage tracker keeps it month-to-month so you can see whether fixes are actually working. Run those first; come back here for the playbook.

The four leakage points

1. Time recorded → time billed.Realisation rate. Late time entry, write-downs at pre-bill review, partner discounts “to keep the relationship”.
2. Time billed → invoice raised. Lag between work being billable and an invoice actually being sent.
3. Invoice raised → cash collected. Collection rate. Aged debt, write-offs, settlement haircuts.
4. Cash collected → margin held. Disbursements mis-billed, refunds, costs forgotten.

Most firms find the biggest pool sits in #1 and #3. Fix those first; they usually fund the time to fix #2 and #4.

Fix 1 — Realisation: tighten the pre-bill review

Time gets written off at pre-bill, almost always silently. A partner glances at a draft invoice, decides “that won't fly with the client,” trims 30%, sends it. Multiply across the firm and that's your realisation gap.

The fix isn't to stop write-offs — sometimes they're right. It's to make them visible and discussed.

1. Track every write-down.Reason code (scope creep, fixed-fee overrun, client hardship, partner judgement, mis-recorded time). Don't default to “client relationship” — that hides everything.
2. Monthly write-down review.30 minutes with the partners. Look at the worst five. Most months you'll find a matter type or client where the same write-down happens repeatedly. That's a pricing or scoping problem, not a billing problem.
3. Don't let pre-bill be a one-person decision. Write-downs over a threshold (e.g. £1,000 or 10% of the bill, whichever is greater) need a second pair of eyes. Stops the quiet trim becoming the default.

Pair this with same-day time entry — see killing the three biggest admin drains — because late time entry is the single biggest realisation leak below the surface.

Fix 2 — Invoice cycle time

Work's billable on the 5th. Invoice goes out on the 28th. That's 23 days of cash sitting on your shoulder for no reason — and the longer the delay, the more of that bill the client will dispute.

Three moves:

• Bill weekly, not monthly. Especially for hourly matters. Smaller bills get paid faster and disputed less. Weekly billing also forces same-day time entry to actually stick.
• Move pre-bill review off the partner's desk where possible. Standard hourly bills with no unusual write-down should go straight from system to client. Partners review the exceptions, not the routine.
• Trigger billing on event, not date.For fixed-fee work — bill when the milestone's reached, not on the 1st of the month. Money in faster, client less surprised.

Fix 3 — Collection: the credit-control rhythm

Collection rate (cash collected ÷ revenue invoiced) sits around 92–96% at well-run small firms. Below 90% means aged debt is building up and someone needs to chase. Above 98% means you're probably not pricing aggressively enough.

The mechanic that delivers good collection at small firms isn't a system — it's a rhythm:

1. Day 14 after invoice: automated polite reminder. From your billing system, if it can. Otherwise the paralegal sends one from a template.
2. Day 30:phone call from the matter handler (not a partner — handler). “Just checking the invoice got through OK.” Friendly. Reveals whether it's a dispute, an admin issue, or just sitting on someone's desk.
3. Day 45: partner call. Same matter, but now partner-to-decision-maker. Different conversation.
4. Day 60: formal letter. Stop work clause activated where applicable.

The first two steps catch about 80% of late payments without any drama. The point is to make the chase impersonal and rhythmic — “this is just what we do at day 14” — rather than something that gets put off because it feels confrontational.

Fix 4 — Disbursements and the small leaks

Smallest pool, but also the easiest to plug because it's almost entirely process. The usual suspects:

• Search fees, court fees, courier costs incurred but never billed back.
• Disbursements billed at cost when your engagement letter says they're markup-able.
• Costs orders awarded against the other side but never actually collected.

One paralegal, one weekly check: pull all matter-level disbursements; flag any not posted to the next bill; chase any costs orders pending. Half a day a week, often £15–30k a year in recovered cash for a mid-size firm.

What good looks like at day 90

Realisation up 3–6 points. Collection up 2–3 points. Invoice cycle time down by 5+ working days. The monthly billing leakage figure is trending down on the tracker, not up. Your partners stop being surprised by their bonus pool.

For one final move when the basics are tight: raising utilisation in 90 days — because billing leakage is what you lose between recorded and collected, but utilisation is what you lose before it's recorded at all. They're different problems and they deserve different fixes.