Virtual CFO vs fractional CFO.
A virtual CFO delivers finance leadership remotely, usually as an ongoing monthly service wrapped around your bookkeeping and reporting. A fractional CFO is a part-time senior hire, often on site some of the time, brought in for a defined period or a specific event. The difference is delivery model and commitment, not seniority.
What is a virtual CFO?
A virtual CFO is finance leadership provided remotely and continuously. The engagement is usually monthly, priced as a retainer, and sits on top of a bookkeeping and management accounts function that the same firm often runs. The rhythm is regular rather than event-driven: a monthly close, a board or owner pack, a rolling forecast, a cash review, and a call to talk through the decisions in front of you.
The model exists because the work moved. Bank feeds, cloud ledgers and shared dashboards mean the person interpreting the numbers no longer has to sit near the person producing them. What a virtual CFO gives up is corridor presence. What it buys is continuity at a cost a growing business can carry every month rather than in bursts.
What is a fractional CFO?
A fractional CFO is a part-time senior finance executive engaged directly by the business, typically for one to four days a month, often through a defined term or a specific mandate: a funding round, a refinancing, a systems change, a sale process, a turnaround. The relationship is closer to a part-time hire than to a service. They may attend board meetings in person, hold a title, and manage your existing finance staff.
Fractional engagements are event-shaped. They ramp up during diligence or a covenant renegotiation and step back down afterwards. A fractional CFO whose day count never changes across two years is usually being used as an expensive management accountant, which is a real failure mode we see when the mandate was never written down.
Virtual CFO vs fractional CFO: how do they actually differ?
| Dimension | Virtual CFO | Fractional CFO |
|---|---|---|
| Delivery | Remote, ongoing | Part-time, often partly on site |
| Commercial shape | Monthly retainer, rolling | Day rate or fixed term, mandate-based |
| Typical trigger | Reporting has outgrown the founder and the bookkeeper | A transaction, a covenant, a turnaround, a systems rebuild |
| Relationship to bookkeeping | Usually integrated with the same firm's ledger work | Usually separate, sits above whoever keeps the books |
| Team management | Rare, the firm brings its own team | Common, often line manages your finance staff |
| Continuity risk | Low, the firm covers absence | Higher, one individual with other clients |
| Board presence | Dial in, prepare the pack | Attend, and often present |
| Exit | Notice period, service continues to the end | Mandate ends, handover to a permanent hire |
Neither label is regulated, which is why the terms are used interchangeably in marketing and precisely in contracts. Read the scope of work rather than the title. If the document promises a monthly pack, a forecast and a call, that is a virtual CFO service whatever it is called. If it promises days, presence and a named individual, that is a fractional hire.
Which one should you choose?
Start from the decision in front of you, not from your revenue. Both models answer different questions well.
- Choose a virtual CFO when the numbers arrive late, the forecast lives in a spreadsheet nobody trusts, you are making pricing or hiring decisions on feel, and the underlying bookkeeping needs work at the same time. The saving is real: one integrated engagement instead of a bookkeeper, a management accountant and a consultant who each blame the other.
- Choose a fractional CFO when there is a discrete, high-stakes event with a deadline: a priced round, a bank facility, an earn-out negotiation, a first statutory audit, a carve-out. These need someone who can sit in a room with a counterparty and hold a position, and they end.
- Choose neither, yet, when the real gap is that nobody is closing the month properly. Strategic finance on top of a broken ledger produces confident answers to the wrong question. Fix the close first with monthly management accounts, then add leadership.
Our own view, which not every firm will print: most businesses that ask for a fractional CFO need a virtual CFO plus a good management accountant, and most businesses that ask for a bookkeeper upgrade during a funding round actually need a fractional CFO for six months. The mismatch runs in both directions and costs money either way.
What does a CFO at either cadence actually produce?
The deliverables overlap more than the marketing suggests. In both models the recurring output is a small set of documents that a board, a lender or an investor can act on.
- A rolling cash forecast. Weekly out to thirteen weeks, reconciled to the bank every Monday. The mechanics are in our 13 week cash flow template.
- A monthly pack. Profit and loss against budget, balance sheet, cash bridge, a KPI page and, more importantly, a page of written commentary that says what changed and what is being done about it.
- A driver-based model. Not a spreadsheet of last year plus ten per cent. Volume, price, conversion, churn, headcount and payment terms as inputs, with scenarios attached.
- Revenue recognition that survives scrutiny. Subscription and milestone businesses need a policy that holds up under IFRS 15 or its US equivalent, ASC 606, before diligence starts rather than during it.
- A compliance calendar that does not surprise anyone. Statutory accounts and the filing deadlines at Companies House, corporation tax under HMRC's Corporation Tax rules, and the point at which growth removes your audit exemption.
That last item is the one founders most often meet by accident. Crossing the audit thresholds changes your year-end by months and your costs by a five figure sum, and it is knowable a year in advance from your own forecast. Our audit and assurance service covers what changes when you get there.
How is each one priced?
Virtual CFO work is normally a fixed monthly fee, scoped by the size of the ledger, the number of entities and currencies, and the reporting cadence. It should include the close, the pack, the forecast and the call. Watch for engagements priced as a retainer but scoped as advice only, where the underlying accounting is billed separately and the fee you compared was never the whole cost.
Fractional CFO work is normally a day rate against a committed number of days, sometimes with a success element on a transaction. The two numbers to ask about are the minimum commitment and what happens when the event runs long, because diligence almost always runs long. Our published fixed-fee pricing plans set out how we structure the recurring side, and the fractional CFO service page covers the mandate side.
What should you ask before signing either engagement?
- Who is the named individual doing the work, and how many other clients do they carry?
- What happens to the monthly close if that person is unavailable for three weeks?
- Is the bookkeeping in scope, out of scope, or assumed to be someone else's problem?
- What is in the monthly pack, and can I see a redacted example before signing?
- Which decisions will you own, and which will you only advise on?
- What does the handover look like when we hire a permanent finance director?
Question six matters more than it sounds. A good engagement of either kind is designed to become unnecessary in its original form. If nobody can describe the handover, the engagement has been sold as a subscription rather than as finance leadership.
How do you tell whether the engagement is working?
Set the test at the start, in writing, and review it at six months. Four measures separate a working engagement from an expensive habit.
- Close speed. Working day on which the management accounts are signed off. Ten working days is a reasonable target for a single-entity business, five for a well-run one. If that number has not moved in six months, the engagement is not touching the process.
- Forecast accuracy. Compare the thirteen week cash forecast made in week one against actuals in week thirteen. A variance that narrows quarter on quarter is the clearest evidence the model reflects the business.
- Decisions changed. Name the specific decisions the engagement altered: a price rise, a hire deferred, a facility renegotiated, a customer dropped. If the list is empty after two quarters, you are buying reporting rather than leadership.
- Surprises removed. Count the times in the period that a tax bill, a covenant test or a cash squeeze arrived without warning. The right answer after the first quarter is zero, and it is the one measure a board notices immediately.
Write these into the engagement letter. A scope of work that lists activities but no outcomes gives neither side anything to review, and it is the reason so many finance engagements end in a vague sense of disappointment rather than a decision.
Where each model fits by business type
Funded software businesses tend to need the fractional model around a raise and the virtual model between raises, which is the pattern behind our SaaS accountants work and the argument in when does a startup need a CFO. Owner-managed businesses with no external investors usually get more from a continuous virtual engagement, because their hardest decisions are pricing, working capital and hiring pace rather than transactions: see small business accountants. E-commerce brands sit in between, because stock commitments create transaction-shaped decisions on a rolling basis, which is why our e-commerce accounting service pairs a monthly forecast with a stock and margin review. Startups preparing for a first institutional round should read startup accountants for VC-backed founders alongside this. Terms used here are defined in our accounting and tax glossary.
Not sure which model you need?
Thirty minutes to look at your close process, your forecast and the decision in front of you, then a straight answer on whether that is a monthly engagement or a six month mandate.
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