Ask a finance director where their firm loses money, and most point at collections. Late payers, disputed invoices, the client who settles for less than what they owe. That is where the loss is visible, so that is where everyone looks.
The money usually leaves earlier. It leaves before an invoice exists, before the work is logged against anything, in the quiet gap between winning a client and opening the file.
A 2026 CFO Research Program from sa.global and Briefing- put numbers on that gap. Thirty finance leaders at UK law firms, each with more than 250 staff, answered detailed questions about how revenue moves through their business. Not one of them rated their client onboarding as very strong. The whole sample had settled on “adequate.” And by their own estimate, 3% to 5% of billable value disappears in the pre-matter window, before a matter formally exists in the system.
Law firms bill by the hour, so their leakage is easy to measure. The pattern belongs to any business that sells time: agencies, consultancies, engineering practices, IT and managed service providers. If you start work before the project exists, someone is doing billable work that no system is watching. That time never gets recorded, so it never gets billed. And because it was never recorded, it never shows up as a write-off either. There is nothing to write off. It is simply absent.
That is what makes early-stage leakage so dangerous. It is invisible by construction.
Four stages, and the loss compounds through all of them
The research tracks revenue across four stages: onboarding, matter or project management, invoicing, and collection. In plainer terms, intake, delivery, billing, and cash. Most firms put their controls at the last two, because that is where money and problems become visible. The leakage starts at the beginning of the cycle.
Watch how it compounds. A client is onboarded with fee terms that are almost right but not quite documented. More than 20% of firms in the study said commercial terms were clarified only after work had already started. Delivery begins on that fuzzy basis, and time gets recorded against a matter, which many times hasn’t been created in the system, or that does not yet reflect the real terms. By the time it reaches billing, the numbers do not line up, so a partner writes part of it down. At collection, the client queries the rest.
Every stage inherits the mess from the stage before it. You can perfect the invoice template and still lose the money, because you cannot bill your way out of a leakage problem.
Why teams keep looking in the wrong place
Here is the part that should bother any leader: most firms cannot see where their losses begin. Between 55% and 60% of the finance leaders in the study said they had no reliable way to trace a write-off back to its origin. The write-off is recorded at billing, so billing takes the blame. But the decision that caused it was made weeks earlier, at intake, by someone who never saw the financial consequence.
So the firm invests in the thing it can see. New billing software. A tighter collections process. A push on realization rates. All of it aimed at the last mile, when the value already leaked out at the first.
The systems integration score across these firms sits at 6 out of 10. That number explains a lot. When onboarding, delivery, and finance run on partly connected systems, a person has to carry information across each gap by hand. People forget. Context gets lost between the engagement letter and the timesheet. The gaps are where the money falls through.
What actually closes the gap
The fix is not a better invoice. It is a single record that every stage writes to and reads from, so a decision made at intake is visible at billing, and a cost recorded in delivery shows up in the forecast the same day.
In law firms, that record is the legal practice management software that holds every matter, timekeeper, and bill in one connected system instead of a chain of spreadsheets and disconnected tools. When the matter is opened properly at the start, with the terms documented and time capture running from the first hour, the 3% to 5% that used to vanish before billing simply gets recorded. It stops being invisible.
The mechanism travels. Whatever your business calls a matter, if intake, delivery, and finance write to one system, the leakage between them has nowhere to hide. If they do not, you will keep finding your losses at the end and keep fixing the wrong stage.
The lesson for the rest of us who bill for time is short. Audit your intake, not just your invoicing. The 3% you are chasing in collections was already gone before the meter started.
Closing this gap requires firms to build a solid data foundation as a single, connected, cloud business platform that intake, delivery, and finance all write to — the terms captured at onboarding, the time recorded during delivery, and the invoice itself, all visible in the same place at the same time. That is the standard worth measuring your own firm against.
[See how sa.global connects onboarding, delivery, and billing for law firms →]
