Virtual CFO for Law Firms in Sydney
A virtual CFO for Sydney law firms: matter economics, lockup as a financing line, and the partnership P&L, translated for managing partners.
Most law firms know their fees and their profit. Far fewer know their lockup, which is the cash their own success ties up in unbilled work and unpaid invoices. For a Sydney firm growing its fee base, lockup is often the single largest hidden financing line in the business. This is a virtual CFO’s view of the numbers that actually run a law firm, written for managing partners rather than accountants.
Published: July 2026
A law firm’s revenue looks simple: hours worked, at rates charged, less the cost of the people who worked them. The complication is timing. Work is performed now, billed later, and paid later still, and the gap between doing the work and banking the cash is where firms get into trouble even while they are busy and profitable.
That gap has a name, lockup, and managing it is the difference between a firm that funds its own growth and one that borrows to pay partners. A virtual CFO engagement for a law firm usually starts here, and the sub-vertical sits under the broader professional services work.
Lockup is the sum of two things: work in progress days (work done but not yet billed) and debtor days (billed but not yet paid). Together they measure how many days of fees are sitting outside your bank account at any moment.
The reason lockup matters so much in law is that it scales directly with growth. Win more work, and unless billing and collection keep pace, WIP and debtors rise in lockstep, consuming cash. A firm can double its fees and find itself tighter on cash than before, because the extra work is all sitting in lockup rather than in the bank.
Consider a firm at $8M in fees carrying, say, 100 days of lockup. That is roughly $2.2M of fees, about a quarter of annual revenue, tied up outside the bank at any moment. Cut lockup by ten days, through faster billing and tighter collection, and the firm releases in the order of $220,000 of cash, without winning a single new matter. That is the arithmetic that makes lockup the first thing a CFO looks at, and it is worth stating plainly: for most firms, reducing lockup is a larger and faster cash lever than growing fees.
The second number firms rarely have is margin by matter type. A firm’s blended profit tells you nothing about which work actually makes money. Fixed-fee matters that ran long, hourly matters written down at billing, matters that soaked up partner time that never made it onto an invoice, each can quietly lose money while the firm as a whole looks profitable.
Matter-level economics answer the question of which work to do more of and which to price differently or decline. It requires attributing time, including the partner time that firms habitually leave uncosted, and comparing the fee actually collected against the true cost of delivery. The firms that do this stop chasing revenue and start chasing the right revenue.
A law firm has two profit stories, and confusing them causes trouble. The operating P&L treats partner drawings as a distribution of profit. The true economic P&L treats a market-rate salary for the work partners actually do as a cost, and only what is left over as genuine profit on the enterprise.
The distinction matters at decision time. A firm that looks profitable on the operating view can be barely breaking even once partners are paid a market rate for their billable hours, which tells you the firm is buying the partners a job rather than building an asset. A virtual CFO builds both views so partners can see the difference and decide accordingly, particularly ahead of any succession or sale conversation.
For most firms, the highest-value fixed-scope deliverable is either a 13-week cashflow forecast built around the billing and collection cycle, or a board or partnership reporting pack that puts lockup, matter margin, and the two P&L views in front of the partners each period. Either is a defined 90-Day Number engagement at a fixed $17,850 plus GST, delivered by day 90 and yours to run afterward. The lockup and utilisation analysis connects naturally to capacity modelling for services firms, which sets the revenue ceiling the current team implies.
Above roughly $25M in fees, or where the firm has a complex finance function needing daily leadership, a full-time finance director becomes the right call. Below that, a firm rarely needs a CFO in the seat every day; it needs specific numbers built well and a reporting rhythm it can maintain. That is the case a project-based virtual CFO is built for, and it is worth reading alongside when you have outgrown a virtual CFO.
What is lockup and why does it matter for a law firm?
Lockup is work in progress days plus debtor days: the fees you have earned but not yet banked, either because the work is unbilled or the invoice is unpaid. It matters because it scales with growth and ties up large amounts of cash. Reducing lockup is often a bigger and faster cash lever than winning new work.
How much cash can reducing lockup release?
It depends on your fee base and current lockup, but the arithmetic is direct. On $8M of fees, each ten-day reduction in lockup releases roughly $220,000 of cash. A firm carrying 100-plus days of lockup usually has meaningful room, and the cash comes from faster billing and collection rather than new matters.
Why does matter-level margin matter if the firm is already profitable?
Because blended profit hides which work makes money. Fixed-fee matters that overran, hourly work written down at billing, and uncosted partner time can each lose money while the firm looks healthy overall. Matter-level margin tells you which work to price differently, do more of, or decline.
What is the difference between the operating and economic P&L?
The operating P&L treats partner drawings as profit distribution. The economic P&L charges a market-rate salary for the partners’ actual work as a cost, showing the true profit on the enterprise. A firm can look profitable on the first view and barely break even on the second, which matters before any succession or sale.
Does a virtual CFO handle our trust accounting?
No. Trust accounting is a regulated compliance function and sits outside virtual CFO work; your bookkeeper, practice manager, and auditor handle it. A virtual CFO works on the decision economics: lockup, matter margin, cashflow, and the partnership P&L. The two are complementary but distinct.
We are a five-partner firm at $9M in fees. Do we need a full-time CFO?
Probably not yet. At that size the need is usually specific, a proper lockup and cashflow view, a reporting pack the partners trust, rather than a full-time executive. A fixed-scope virtual CFO engagement builds those and hands them over. A full-time hire tends to make sense past roughly $25M in fees or where daily finance leadership is required.
How does pricing work?
The 90-Day Number is a fixed $17,850 plus GST for one named deliverable by day 90, with no retainer or auto-renewal. Most Australian virtual CFO work is sold as an open-ended monthly retainer at $3,000 to $8,000; the project-based model is deliberately different, and rare in this market.
Sydney Virtual CFO is a Sydney-based virtual CFO service for founders running $2M 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 $17,850 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.
Visit Sydney Virtual CFO | The 90-Day Number | Book a Call
This content is general information only, written for Australian founders running businesses in the $2M 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.
