A Sydney consulting firm at $7M revenue feels its problem as a cashflow problem. There is always work on, the team is flat out, and yet the bank balance never quite reflects how busy everyone is. The managing partner assumes they need to win more work. They almost never do. The issue is that a large slice of the revenue they have already earned is sitting unbilled, or billed and uncollected, and a chunk of the hours the team worked never converted to cash at all. In a labour business, those leaks decide whether the firm is profitable or just busy.
This is a guide to what a virtual CFO does for a Sydney professional services firm between $3M and $15M, the operating metrics that actually drive profit, and how the work is scoped.
Published: June 2026
Professional services firms, law, consulting, architecture, engineering, design, share one structural feature: people are both the product and the largest cost, typically 60% to 70% of revenue. That means profitability is not driven by the headline revenue figure. It is driven by how much of your people's time you sell, at what rate, and how quickly that work turns into cash. Three numbers carry most of the weight.
Utilisation. The percentage of available time spent on billable work. The benchmarks are sobering: the industry-average lawyer utilisation sits around 37%, roughly 2.9 billable hours in an eight-hour day, with well-managed firms targeting 40% to 45% and partners typically expected at 65% to 75% (Accounting Atelier law firm benchmarks; Clio Legal Trends). The same logic applies to consultants and architects measured against available capacity.
Realisation. The percentage of recorded billable time that actually gets invoiced, after write-offs and discounts. Realisation is consistently the single strongest predictor of financial success in these firms, because it is where quiet margin leakage lives.
Collection. The percentage of invoiced work that gets paid. The average law firm collection rate is around 93%.
Multiply them and the picture is stark. At industry averages, roughly 37% utilisation times 88% realisation times 91% collection means under 30% of working time converts to collected revenue. Lift utilisation from 37% to 45% and the effective billing rate can rise more than 20%, potentially adding tens of thousands of dollars per fee earner per year. None of this shows in the revenue line. It shows in a model that decomposes revenue into its drivers, which is the work.
The cashflow problem the managing partner feels has a name: lockup. It is the number of days of revenue tied up as unbilled work in progress plus unpaid invoices, and it is the professional services equivalent of inventory.
The median total lockup for law firms in 2025 is around 93 days, split into roughly 43 days of realisation lockup (work done but not yet billed) and 32 days of collection lockup (billed but not yet paid), with industry total lockup commonly cited at 75 to 100 days and well-managed firms targeting under 45 days. For a firm billing $7M a year, every 30 days of lockup represents about $575,000 of earned revenue sitting outside the bank. Cutting lockup from 90 days to 60 on that firm frees up over half a million dollars of cash, without winning a single new client.
That is usually the highest-value thing a virtual CFO does for a professional services firm: model the lockup, find where the days are accumulating (slow billing, scope creep on fixed fees, stalled approvals, lax collections), and build the cashflow forecast that makes the leak visible and fixable.
Consider a Sydney design and engineering firm at $5M revenue, 35 people, labour at 64% of revenue, utilisation hovering around 40%, and total lockup near 100 days. The owner is considering a $250K line of credit to ease the cash squeeze and is thinking about hiring two more engineers to handle the workload.
Model it and the real problem surfaces. The firm does not have a demand problem, it has a conversion problem. The 100-day lockup is tying up roughly $1.4M. Pulling lockup back to 60 days, by billing weekly instead of monthly, tightening realisation on a handful of scope-creeping fixed-fee jobs, and chasing receivables on a predictable cadence, releases close to $550K of cash. That is more than twice the line of credit the owner was about to take on, and it costs nothing in interest. The two new hires only make sense after utilisation and realisation are lifted, because adding capacity to a firm that already fails to convert its time just adds cost. The order of operations is the insight, and it only appears once the numbers are built.
Most professional services firms set prices by looking sideways at what competitors charge, then defend margin by working harder. That is backwards. In a labour business, the pricing model you choose determines where your margin risk sits before a single hour is worked.
A virtual CFO models the realised margin under each structure for your actual work, so you can see which clients and service lines should move to fixed fee, which retainers are underpriced for the hours they consume, and where a price rise is overdue. Pricing set against margin data, rather than against a competitor's rate card, is usually the fastest profit lever a firm has.
Most virtual CFOs sell professional services firms an open-ended monthly retainer at $3K to $8K per month. We think the work a firm actually needs, a lockup and cashflow model, a profitability-by-client or by-matter build, a clean owner-facing dashboard, is project work with a defined output, not a standing meeting.
Our front-door engagement, the 90-Day Number, is fixed scope, fixed fee, fixed timeline at $9,950 plus GST, with one named deliverable on day 90. For a professional services firm that is usually a 13-week cashflow forecast built around lockup, a profitability-by-client-and-service-line model, or a board or partner reporting pack tracking utilisation, realisation, and lockup. Led by a Chartered Accountant (CA ANZ). No retainer, no scope creep. On day 90 you have the model, and what comes next is your decision.
Why is my firm busy but not generating cash?
Usually lockup. Earned revenue is trapped as unbilled work in progress or unpaid invoices. At a 90-day-plus lockup, a meaningful share of your annual revenue is sitting outside the bank at any given moment. Tightening billing and collections releases that cash without any new work.
What is a good utilisation rate?
For fee earners, well-managed firms target 40% to 45% on the law-firm definition, with partners higher at 65% to 75%. The number matters less than tracking it honestly and tying it to capacity and hiring decisions. Most firms do not measure it at all.
What is realisation and why does it matter so much?
Realisation is the share of recorded billable time that actually gets invoiced after write-downs. It is the strongest single predictor of profitability because it captures quiet leakage: discounts, write-offs, and over-servicing that never reaches an invoice.
What does the 90-Day Number deliver for a professional services firm?
One named deliverable on day 90: typically a lockup-aware 13-week cashflow forecast, a profitability-by-client model, or an owner or partner reporting pack. Fixed scope at $9,950 plus GST, no retainer.
Do I need a full-time CFO?
Most firms below $15M revenue do not. A full-time finance executive runs a base of $180K to $300K, closer to $250K to $350K-plus loaded with super, leave, and recruitment. The work most firms need is a model built properly and a reporting rhythm established, which is project work.
Is this different from my accountant?
Yes. Your accountant handles compliance and statutory accounts. A virtual CFO works on the levers that drive profit and cash: utilisation, realisation, lockup, pricing, and the owner-facing numbers that inform decisions.
Sydney Virtual CFO is a Sydney-based virtual CFO service for founders running $3M to $15M businesses across SaaS, ecommerce, professional services, construction, and other low-volume, high-value industries. We deliver fixed-scope CFO engagements with a named deliverable on day 90: a 13-week cashflow forecast, a fundraise-ready financial model, a unit economics build, or a board reporting pack you can run on your own.
Our front-door product, the 90-Day Number, is fixed scope at $9,950 plus GST. We are one of the few project-based virtual CFOs in Australia, in a market built almost entirely on monthly retainers. No retainers without a deliverable. No 80-page reports. No theatre.
This content is general information only, written for Australian founders running businesses in the $3M to $15M revenue range. It does not constitute tax, financial product, investment, or legal advice and should not be relied on as such. The work referenced is led by a Chartered Accountant (CA ANZ), but Sydney Virtual CFO is not a licensed tax agent, not a licensed financial adviser, and not authorised to provide personal financial advice. Tax obligations, accounting treatments, fundraise terms, and statutory requirements depend on your individual circumstances. For advice specific to your business, contact the team directly or consult a registered tax agent, licensed financial adviser, or qualified lawyer. Information was current at the time of publication and may change without notice. We review and update guides periodically.
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