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To choose a fractional CFO, confirm who will actually do the work, check that they have experience at your stage, ask for named deliverables for the first 90 days, and make sure they fit with your bookkeeper and CPA. Only then compare price. The same title covers very different providers: a single senior operator, a firm with a partner, a manager and a team of analysts, or a marketplace that matches you with whoever is available. Pricing is covered in the guide to fractional CFO cost, so this guide stays on fit.
Firm, independent or marketplace
There are three common ways to buy fractional CFO work. None is right for every company. The honest trade-offs:
| Fractional CFO firm | Independent fractional CFO | Staffing marketplace | |
|---|---|---|---|
| Who you get | A senior lead plus a team, often with analysts doing much of the build | One senior person, sometimes with a small bench | A matched individual from a pool |
| Strengths | Depth of bench, coverage during vacations, broader service menu | Continuity, direct access to the senior person, one point of accountability | Speed to start, wide choice, easy to swap |
| Watch for | Senior time diluted across many clients, junior staff turnover | Capacity limits, single point of failure, narrower specialty | Variable quality, limited accountability, little institutional knowledge |
| Best fit | Companies that also want bookkeeping or accounting under one roof, or need several specialists | Companies that want one experienced operator who knows the business deeply | Short, well-defined needs where speed matters more than depth |
Questions to ask on the first call
Whichever model you lean toward, the first call should cover the same ground:
- Who will do the work each week, and who will be in board meetings?
- What have you built for companies at this stage and in this industry?
- What would you build first here, and why?
- What will exist at the end of the first 90 days?
- How do you work with the existing bookkeeper, controller and CPA?
- Where will the models and reports live, and who owns them?
- How often are meetings, and how quickly do you answer ad hoc questions?
- What is out of scope?
- What is the minimum term and the notice period?
- Can the company speak with two or three clients at a similar stage?
Who actually does the work
Many firms are built on leverage. A senior partner wins the work and owns the relationship, and analysts or managers build the model, prepare the reporting and assemble the board deck. That model can work well. It becomes a problem when it is not said up front, and the founder discovers months in that the person they hired attends one meeting a month.
Ask directly:
- Who will build the operating model and the cash forecast?
- Who will be in board meetings and investor calls?
- Who answers when you send a question on a Tuesday afternoon?
- If there is a team, what does each person do, and how much of the senior person's time is included?
There is nothing wrong with a junior analyst refreshing a forecast. There is something wrong with a junior analyst making judgment calls about how revenue is recognized in your metrics, or what assumptions drive the runway number your board relies on.
Relevant experience by stage and industry
General finance experience is not the same as experience at your stage in your industry. A CFO who spent a career in manufacturing will know cost accounting cold and may need to learn ARR, net revenue retention and burn multiple on your time.
Stage
- Seed. The need is structure: a clean chart of accounts, a cash forecast, a simple model and a monthly report. Look for someone who can build quickly and keep it light.
- Series A. The need is a real operating model, consistent SaaS metrics and a board package that holds together quarter after quarter.
- Series B. The need is scenario planning, cohort analysis, a data room and, often, preparing the company to hire a full-time finance leader.
Ask what they would build first at your stage, and why. A specific answer is a good sign. A generic list of services is not. The guide to fractional CFOs for startups covers what the work looks like at each stage in more detail.
Industry
For software companies, ask how they define ARR, how they treat multi-year contracts and expansion revenue, and how they calculate retention. The answers should come easily. For other recurring revenue businesses the questions change, but the test is the same: have they seen your revenue model before?
The milestone in front of you
If a raise, a lender conversation or a sale is coming in the next year, ask what part they played in similar processes. Building a model is different from defending one in diligence, where a buyer's quality of earnings review tests the numbers line by line.
Scope and deliverables in the first 90 days
A good provider can describe what will exist at the end of month three that does not exist today. A reasonable picture for most companies:
- A cash forecast with a runway number under a base and a downside case
- An operating model tied to the actuals
- A monthly reporting package with defined metrics and budget versus actual
- A finance calendar agreed with leadership: when the close lands, when the forecast is refreshed, when board materials are due
The details will vary. What should not vary is that the deliverables are named, such as "a cash forecast, refreshed weekly."
How they work with your bookkeeper, controller and CPA
A fractional CFO sits on top of the books, not in place of them. Ask how they will work with the people already producing your numbers:
- Will they rely on your current bookkeeper and close process, or push you to switch to their in-house team?
- What do they need from the close, and by when, to produce reporting on time?
- How do they handle it when the books are not ready or not right?
- How do they coordinate with the CPA on items that touch both planning and tax?
A provider that insists on replacing your bookkeeper as a condition of the engagement may be selling bookkeeping more than CFO work. Sometimes a change is warranted. It should be a recommendation with reasons, not a prerequisite.
Tools and systems
Ask what they will build in and what you will own. The safest answer is that the work lives in your systems and your files: your accounting platform, and models in Excel or Google Sheets that your team can open and read.
Put ownership in writing too. Under US copyright law, work commissioned from an outside party counts as a work made for hire, owned by the company that ordered it, only if it falls into one of nine categories listed in the statute and both sides sign a written agreement saying so (U.S. Copyright Office, Circular 30). So who owns the models and reports should be settled in the engagement letter, not assumed.
Be cautious when the model lives in a proprietary platform you lose access to when the engagement ends. Also ask whether they will help clean up the chart of accounts and reporting structure, because a forecast is only as good as the categories underneath it.
Communication cadence and access
Fractional means part time, so agree up front how that time shows up:
- How often you meet, and with whom
- When the monthly reporting package goes out
- How ad hoc questions are handled and how quickly they get answered
- What happens during a busy stretch, such as a raise or a board meeting
Response time is worth pinning down. A CFO who takes a week to answer a question about a hire is not much help when the offer letter is due on Friday.
References and what to ask them
Ask for two or three references from companies at a similar stage. Then ask the references questions that a testimonial would not answer:
- Who did the work day to day?
- What was in place after the first 90 days?
- How did they handle a number that turned out to be wrong?
- How did they work with your bookkeeper and CPA?
- How did they show up in board meetings or with investors?
- Would you hire them again for the next stage?
Listen for specifics. Vague praise from a reference is a weak signal.
How to compare proposals side by side
Lay the proposals next to each other and check each against the same list. Leave price out until scope is comparable, because a lower number for less work is not a saving.
| Check | What a strong proposal shows |
|---|---|
| Named lead | The person doing the work, by name, and their role |
| Team | Who else is involved and what each person does |
| Deliverables | Named outputs, not activities or adjectives |
| 90-day plan | What will exist at the end of month three |
| Cadence | Meeting rhythm, reporting dates, response time |
| Existing team | How they work with your bookkeeper, controller and CPA |
| Systems | Where the work lives and who owns the files |
| Out of scope | A clear boundary, especially bookkeeping and tax |
| Terms | Minimum period, notice period, how scope changes are handled |
| Exit | What you keep and how handover works if the engagement ends |
If a proposal leaves several of these blank, ask. How a provider answers tells you a lot about how they will work.
Red flags
- Vague scope. Hours or "support" with no named deliverables make it impossible to tell whether the work got done.
- No named person. A proposal from "the team" with no lead named, or a senior name that disappears after signing.
- Bookkeeping dressed up as CFO work. If most of the scope is categorizing transactions and reconciling accounts, it is an accounting engagement with a CFO title.
- Long lock-ins without an exit. A minimum period to get through onboarding is reasonable. A year-long commitment with no notice clause is not.
- Promising fundraising outcomes. No finance partner can guarantee a raise, a valuation or an introduction that closes. Investors decide on the business, the market and the round. Good preparation improves the odds and shortens diligence. It does not guarantee a term sheet.
- A price before a look. A firm number quoted before anyone has seen how your numbers are run today.
How an investor reads your choice of finance partner
Investors rarely ask who the fractional CFO is; they see the result in whether forecasts hold up, whether metric definitions stay consistent, and how quickly diligence questions get answered. When evaluating candidates, ask them to walk through how an investor would test your current model. The quality of that answer is a preview of the next board meeting.
How Decipher approaches this
Decipher's founder works with clients directly, from the first call through every deliverable, with nearly a decade of FP&A experience inside private equity backed enterprise software companies. After a 30-minute intro call, Decipher sends a written proposal within 48 hours covering scope, deliverables, timeline, cadence and price. Retainers start with a three-month minimum, then continue month to month with 30 days' notice. Decipher works alongside your bookkeeper and CPA and does not do bookkeeping or tax. See Decipher's fractional CFO services for what each engagement covers, or take the finance scorecard, which takes about two minutes and shows where your finance function stands.
FAQ
How do you hire a fractional CFO?
First choose the model: a firm, an independent fractional CFO or a staffing marketplace. Then assess each option on who will do the work, stage and industry experience, the deliverables promised for the first 90 days and fit with the existing bookkeeper and CPA. Call two or three references and compare proposals on scope before price.
Is it better to hire a fractional CFO firm or an independent fractional CFO?
Neither is better in every case. Firms bring a bench, vacation coverage and more services, though senior attention may be spread thin. Independents bring continuity and direct contact with one senior person, at the cost of limited capacity and a single point of failure. In both cases, confirm who does the work and their track record.
What questions should you ask a fractional CFO before hiring?
Focus on who does the weekly work and attends board meetings, relevant stage and industry experience, what they would build first, and what will exist after 90 days. Then cover how they work with the bookkeeper and CPA, who owns the models, response times, what is out of scope, the minimum term and notice period, and references.
What are the red flags when choosing a fractional CFO?
Watch for scope with no named deliverables, no named lead, accounting work sold under a CFO title, year-long commitments with no notice clause, guarantees about raising money, and a firm price before anyone has reviewed how the numbers are run. Investors decide on the business, the market and the round, so no adviser can promise a term sheet.
How does your finance function score?
Twelve quick questions on the close, forecasting, reporting and decisions. About two minutes, with a score out of 10.
Take the 2-minute scorecardRelated reading
Sources
- Works Made for Hire (Circular 30), U.S. Copyright Office (accessed )
Educational content, not tax, legal or investment advice. Figures in examples are illustrative, not client data.
