Do we really need a full-time CFO now, or can a fractional CFO give us the financial leadership we need without making a permanent executive hire too early? That is one of the most common questions founders ask once cash management becomes more demanding, investors expect cleaner reporting, or growth creates more operational complexity. For startups working with , the practical answer is usually this: choose a fractional CFO when you need senior financial judgment, forecasting, fundraising support, and strategic oversight on a part-time basis; choose a full-time CFO when finance has become a daily executive function that affects reporting, controls, capital planning, investor communication, and cross-functional decision-making across the business.
Why This Decision Matters
There’s a lot that goes into a CFO’s job. Senior finance leaders create reports, oversee how/where investments will occur, prepare forecasted numbers, ensure legal obligations are completed, and aid management in making financial decisions, according to the U.S. Bureau of Labor Statistics. Likewise, ACCA states that CFO activities include sourcing and managing funds, measuring performance, keeping the books (in management), providing support in decision making, and preparing financial statements. Additionally, the U.S. Small Business Administration states that the foundational element in managing finances is the balance sheet as it relates to cash flow projections. Therefore, as opposed to asking the question, “Does my startup have an accounting function?” One should instead ask whether or not your business truly requires senior finance leadership frequently enough to warrant the method of operation you select.
Highlights briefly
- Typically, hiring a fractional CFO makes much more sense for companies looking for a senior finance resource that they don’t need to have every day. Examples include: there are more important things to focus on like having accurate forecasts or getting prepared for fundraising than building a large internal finance function or designing useful KPIs.A full-time CFO is usually the better fit when finance has become a constant executive responsibility involving controls, reporting cadence, team supervision, governance, and capital-allocation decisions.
- Hiring a fractional CFO is more appropriate for businesses needing a senior finance professional when that individual isn’t going to be needed on a regular basis. For example, firms often spend their time and resources working on other higher priority items such as designing accurate forecasts or preparing for capital raising rather than developing a large internal finance team, creating meaningful KPIs, etc.
- Stage matters less than complexity. A lean company can need a CFO earlier than a larger company if its financing, compliance, or operational setup is more demanding.
Who Is a Fractional CFO Right For?
For early-stage (pre-seed, seed, Series A, and bootstrap) startups that require additional financial insight before hiring a full-time CFO, a fractional CFO is often the perfect option. Many of these organizations have basic accounting needs met through bookkeeping, payroll, or controllership, but still need help making business decisions based on their finances, including cash runway modeling, adherence to budget goals, investor presentations, fundraising assistance, due diligence preparation, and enhanced performance dashboards. This closely aligns with ERB’s account structure, budgets, forecasts, investor-ready financials, and other support for start-ups. Additionally, as detailed in the SBA, good fractional CFOs can help a growing company’s finance department become an independent internal entity by establishing processes for performing regular reviews of annual budget versus actuals and implementing forecasting processes.
Where a Full-Time CFO Creates More Value
When finance evolves from being just a supporting function to being an integral part of a company’s overall leadership structure, a full-time CFO starts to become a stronger option. Generally speaking, this transition occurs in companies that operate in more than one legal entity, have exposure to more than one currency, have increased board member or investor expectations, have a larger finance organisation that requires more management supervision, have tighter compliance obligations, or regularly make decisions pertaining to funding, hiring policies, pricing restraint, and the allocation of resources. According to the Bureau of Labor Statistics (BLS), some of the senior finance roles include supervising the reporting and budgeting process, ensuring compliance with applicable laws and rules, and providing financial advice to executive management. In addition, the U.S Securities & Exchange Commission places the onus on management for establishing and maintaining effective internal controls over financial reporting, while the International Federation of Accountants (IFAC) describes the modern CFO and finance function as strategic partners that provide value to the board, risk, internal controls, and capital allocation. Once those needs begin to develop into ongoing situations rather than one-off events, then generally speaking, a full-time CFO will provide significantly more leverage than a part-time CFO arrangement.
How to Decide
To begin with it is more sensible to start with complexity rather than vanity in terms of understanding your revenue streams as well as your compliance load (for taxes, etc). Once you have established what your company looks like on paper (i.e. your reporting obligations/structures from overheads), take into account frequency of the biggest financial decisions you will need to make within the next year (monthly closes; fundraising programs or limited number of major strategic projects); if this is going to be more than once a month you are going to need an FTE level executive to manage it vs a fractional type position. Lastly see how prepared you are for potential investors by having managerial examples of past successes and recent activities documented previous financial statements in determining whether to fund you). After deciding whether your company will require made-to-order financial oversight (e.g. forecasting, variance analysis, investor presentations) and if possible be done on an ongoing basis (if so then you may wish to look at FTEs vs fractional, this is important to you since at best you’ll have full-time financial leadership during wildly varied conditions over any given year and in some instances within multiple financial leaders departments within business (i.e., 1 per department).
Summary
The best path for many new businesses is developmental/ staged/ phase-in. In the early days keep transaction finance solid, introduce the fractional CFO for financial forecasting, fundraising, and complexity that start to exceed the owners’ capabilities, then transition to a permanent CFO when finance starts to become a daily executive responsibility associated with control, governance, and strategy execution. This supports both the modern expectations of CFOs and ERB’s service delivery model for startups.
FAQ
When should a startup hire a CFO?
A startup should consider CFO-level support when forecasting, cash runway, investor reporting, or compliance become too complex for the founders and basic accounting alone. That support can begin fractionally and become full-time later.
What does a fractional CFO do?
A fractional CFO typically handles forecasting, budgeting, cash planning, investor-facing reporting, KPI design, and strategic finance projects rather than only bookkeeping or close work.
Is a controller the same as a CFO?
No. BLS describes controllers as leaders of financial reporting and forecasting processes, while CFO responsibilities extend more broadly into funding, strategy, performance measurement, and executive decision support.
Can a fractional CFO help with fundraising?
Yes. ERB Proximo explicitly highlights fundraising support, financial models, forecasting, and investor-ready reporting, and the SBA notes that investors examine financial statements and related materials during due diligence.
Do we need a full-time CFO before expanding internationally?
Not always. Some startups can expand with a fractional CFO plus strong accounting, payroll, and setup support, but sustained cross-border complexity can justify a full-time CFO sooner.
Should we hire a CFO before or after Series A?
There is no universal rule. ERB’s Proximo stage-based positioning suggests the better trigger is financial complexity, not the funding label alone: some startups need CFO support before Series A to become investor-ready, while others wait until scaling makes finance a daily executive function.