Hiring a Fractional CFO for Your Startup
There is a stage in most startups when the founder is still doing the finance work at night, the bookkeeper is keeping the books tidy, and nobody is really thinking ahead. A fractional CFO fills that gap: senior finance judgment for a few days a month, without a full-time executive salary. This guide shows you when hiring a fractional CFO makes sense, how to scope the role and how to make the first 90 days count.
Key takeaways
- A fractional CFO is a part-time, senior finance leader who works with several companies at once, usually on a monthly retainer or a defined project.
- The role is about forward-looking decisions: planning, fundraising readiness, pricing, hiring plans and board reporting. Bookkeeping and tax filing are separate jobs.
- Write a clear scope with outcomes, hours, access and a review date before you sign anything.
- The first 90 days should produce a clean close process, a working financial model and a reporting rhythm you can keep.
Mid-July is a good moment for this: the first half is closed and autumn budgeting and fundraising are only weeks away.
A quick note: this article is general information, not financial, tax or legal advice. Rules on accounting, tax and employment vary by country, so check with a qualified accountant or lawyer for your own situation.
What a fractional CFO actually does
Think of a fractional CFO as the person who connects your numbers to your decisions. They do not usually record transactions or file returns. They look at what the books say, build a view of the future and help you choose between options with your eyes open.
Typical responsibilities include:
- Financial planning and modeling. A driver-based model that links hiring, pricing, sales and spending to cash and runway.
- Monthly reporting. A short pack for founders, the board and investors that explains what changed and why.
- Fundraising readiness. Cleaning up historical numbers, building the forecast investors will test and organizing the data room.
- Pricing and margin work. Checking which products, plans or customers actually make money.
- Systems and controls. Approval rules for spending, a tidy month-end close and clear ownership of each task.
How it differs from other finance roles
Founders often mix up the finance roles, which leads to hiring the wrong person. Here is the simple split.
| Role | Main focus | Looks | Typical output |
|---|---|---|---|
| Bookkeeper | Recording transactions accurately | Backward | Reconciled accounts |
| Controller or accountant | Closing the books, compliance, tax filings | Backward and present | Monthly financial statements, returns |
| Fractional CFO | Strategy, planning, capital, decisions | Forward | Model, forecast, board pack, recommendations |
A fractional CFO depends on clean books. If your bookkeeping is months behind, fix that first, or make sure the CFO's scope includes managing the catch-up with your bookkeeper.
Signs your startup is ready for one
You do not need a CFO on day one. Many early startups get by with a good bookkeeper, an accountant at year end and a founder who checks the bank balance every morning. The signal to bring in senior finance help is usually a decision you cannot make well with the information you have.
- You are preparing to raise. Investors will ask for a forecast, historical numbers that tie together and answers about margins and hiring. A fractional CFO can make that process calmer and faster.
- Your board or investors want better reporting. If monthly updates take you a full weekend, the reporting needs a system.
- You are about to hire several people. A hiring plan changes your cash position for years. It deserves a proper model.
- Revenue is growing but cash is tight. Payment terms, inventory, deferred revenue or slow collections might be the reason, and a CFO can find it.
- You are taking on debt or a complex contract. Loan covenants, personal guarantees and revenue-share deals deserve a second pair of expert eyes.
Common mistake
Hiring a fractional CFO to "do the finance stuff" without saying what decisions you need help with. You end up paying senior rates for bookkeeping clean-up and generic reports. Start from the two or three decisions coming up in the next six months and build the scope around them.
Engagement models and how to scope the role
Fractional CFOs usually work in one of three ways. Rates vary widely by country, experience and scope, so ask several candidates for proposals and compare what you get for the money rather than the headline number.
Monthly retainer
A set number of days or hours per month for ongoing work: reporting, planning, board meetings and ad hoc questions. This suits startups that want a steady finance partner.
Project-based
A fixed scope with a clear end, such as building a fundraising model, preparing a data room or setting up a budgeting process. This suits founders who want to test the relationship or need help with one big event.
Hourly or on-call
Pay as you go for advice. It looks flexible but can be hard to budget, and it rarely builds the systems you need. It works best as a top-up after a retainer ends.
Whichever model you choose, a good scope answers six questions:
- Outcomes. What will exist at the end of 90 days that does not exist today? Name the deliverables.
- Time. How many days or hours per month, and how is extra time agreed and billed?
- Rhythm. Which meetings will the CFO attend: weekly founder check-ins, monthly close reviews, board meetings?
- Access. Which systems, bank accounts and documents will they see, and with what permissions?
- Boundaries. What is not included, such as tax filings, audit work or day-to-day bookkeeping?
- Review and exit. When will you review the arrangement, and what notice does either side give to end it?
Pro tip
Give the CFO read-only access to banking and accounting systems by default. Payment approval rights should stay with founders or named staff unless you make a deliberate decision to change that and document it.
How to find and interview candidates
Good fractional CFOs often come through referrals from investors, other founders, accountants and lawyers who work with startups. Ask people whose numbers you trust who they use. You can also look at professional networks and firms that place part-time finance leaders.
When you speak to candidates, you are testing three things: relevant experience, how they communicate and whether they can work at your pace.
Questions worth asking
- Which companies at our stage and in our business model have you worked with, and what did you change for them?
- Walk me through how you would build a forecast for a business like ours. What drivers would you start with?
- How many clients do you work with at once, and how do you handle a week when two of them need you urgently?
- What do you need from our bookkeeper and from me each month?
- Tell me about a time you told a founder something they did not want to hear. How did you handle it?
- Which tools do you prefer for modeling and reporting, and can you work with what we already use?
- What would you expect to deliver in the first 30, 60 and 90 days?
Ask two founder references one simple question: "Would you hire this person again for the same job?"
A fractional CFO scope template
Copy this table into your proposal or engagement letter and adapt it. The hours and dates are made-up examples for illustration only.
| Workstream | Deliverable | Owner on your side | Example time per month | Due (example) |
|---|---|---|---|---|
| Month-end reporting | Five-page monthly pack with commentary | Founder and bookkeeper | 1 day | By the 10th of each month |
| Financial model | Driver-based model with base and cautious cases | CEO | 2 days in month one, then half a day | End of week 6 |
| Fundraising readiness | Data room index and investor Q&A sheet | CEO and COO | 1 day | End of week 12 |
Add a final row for "Out of scope", such as tax returns. That one line prevents awkward invoices later.
Your first 90 days together
A good fractional CFO arrives with a plan, but it helps if you know what to expect. Here is a practical shape for the first three months.
Days 1 to 30: understand and clean up
The CFO reviews your accounts, contracts, payroll, bank accounts and current reporting. They meet your bookkeeper and accountant, map how money flows through the business and list the problems they find. By the end of the month you should have a written list of issues ranked by importance.
Days 31 to 60: build the core tools
This is when the model takes shape. It should connect the things you control, such as headcount, pricing, marketing spend and payment terms, to revenue, costs and cash. The CFO also sets up a close calendar so the books are finished on a predictable date each month, and agrees the format of your monthly pack.
Days 61 to 90: use the numbers to decide
Now the work turns to decisions. You might test two hiring plans, review pricing on your lowest-margin product or prepare for a raise in the autumn. The CFO should present options, the trade-offs and their recommendation, while you and your co-founders make the call.
Hypothetical example
Imagine Lena, founder of a small software company with eight people and a seed round behind her. She plans to raise again early next year and wants to hire four engineers this autumn. Her fractional CFO spends the first month cleaning up how annual contracts are recorded, then builds a model in month two. The model shows that hiring all four engineers in September would leave too little room if sales slip. Lena staggers the hires across two quarters, keeps the plan she wanted and walks into investor meetings with a forecast that holds up to questions. (This scenario is made up for illustration.)
Making the relationship work long term
A fractional CFO is only as useful as the information and attention you give them. A few habits keep the partnership productive.
- Keep a shared decision log. Record what you decided, what the numbers said and what you expect to happen. Review it each quarter.
- Bring them in early. Ask for input before you sign a big contract, not after the first invoice lands.
- Review the scope every six months. Needs change quickly in a growing startup.
Also think about how the arrangement is set up legally. A fractional CFO is usually an independent contractor or works through their own firm. Contractor status rules differ by country: in the US the IRS looks at control and independence, and some states use a stricter ABC test, while in the UK the IR35 off-payroll rules can apply. Ask an employment lawyer or accountant if you are unsure.
When to move to a full-time CFO
The fractional model has natural limits. If you find you need the CFO in almost every leadership meeting, finance is managing a team of several people, or you are preparing for a large round, an acquisition or a listing, a full-time hire may now make sense.
Your fractional CFO action checklist
- List the two or three finance decisions you face in the next six months
- Check that your bookkeeping is current, or plan the catch-up
- Ask investors, founders and your accountant for referrals
- Interview at least three candidates with the questions above
- Call two founder references for your top choice
- Write a scope with outcomes, time, access, boundaries and a review date
- Set read-only system access and keep payment approvals with you
- Agree a 30, 60 and 90 day plan in the first week
- Book a scope review in six months
Frequently asked questions
How many hours a month does a fractional CFO usually work?
It depends entirely on your stage and needs. Some startups need a few days a month for reporting and planning, while others need more during a fundraise. Agree a baseline in the scope and a clear process for adding time when something big comes up.
Can a fractional CFO file my taxes?
Usually not. Tax filing is typically handled by an accountant or tax adviser. A fractional CFO may coordinate with them and plan around tax deadlines, but check the scope and confirm who is responsible for each filing.
Should a fractional CFO get equity?
Some startups offer a small amount of equity alongside cash, especially for a long engagement. If you do, put it in writing with vesting, and remember that equity for contractors can have tax and legal implications that differ by country. Talk to your lawyer before you offer it.
Is a fractional CFO worth it before we raise?
It can be if you are preparing for a raise, planning major hires or struggling with cash despite growth. If your business is still very simple, a good bookkeeper and accountant may be enough for now. Start with the decisions you face and decide from there.
Related reading
The bottom line
Hiring a fractional CFO is a way to get senior finance judgment exactly when your startup needs it, without the cost of a full-time executive. Start with the decisions ahead of you, make sure the books are clean, write a tight scope and expect a clear 90-day plan with real deliverables.
Use these summer weeks to set it up. By the time autumn planning and fundraising conversations begin, you will have numbers you trust and a partner who can explain them as clearly as you explain your product.
