Do you need a fractional CFO yet?

Probably not yet. Most pre-seed and seed companies need a good bookkeeper or outsourced accountant and a clean monthly close well before they need a CFO of any kind. That changes when a specific trigger shows up: a priced round that needs a real model, complex revenue recognition, a board asking questions you can't answer, a year of runway with no plan, multiple entities, or debt.

The order matters. A CFO, fractional or full-time, works from your books. If the books are three months behind, you are paying a strategic rate for someone to do catch-up bookkeeping.

What does each finance role actually do?

Founders tend to blur four different jobs together:

• Bookkeeper. Records and categorizes transactions, reconciles bank and card accounts, and keeps the accounting system current. This is the record of what happened.
• Outsourced accountant. Closes the books each month, produces the profit and loss, balance sheet and cash flow statement, handles accruals, and usually coordinates tax filings. Many firms bundle this with bookkeeping.
• Fractional CFO. A senior finance person working part-time, usually across several companies. Owns the operating model, budget and forecast, prepares fundraising financials, and joins the board conversation about cash.
• Full-time CFO. The same judgment every day, plus running a finance team, owning audits and banking relationships, and later the path to an exit.

The first two look backwards and make the numbers correct. The second two look forwards and make decisions with them. Bessemer's guide to hiring a CFO and building a finance team quotes Upvest's CFO on the split: controllership "is more about getting the books right," and "not a lot of people are good at both."

When do you not need a CFO yet?

When you have one entity, one bank account, simple revenue, and the question you are trying to answer is how much cash you have and how long it lasts. That is not a CFO question. It is a bookkeeping question plus a formula.

Bessemer's guidance for the earliest stage, roughly $0 to $5 million in ARR, is about controls and books that get closed on a timely, regular basis. The same guide notes it is much more common for early-stage startups to hire a head or VP of finance at Series A or B, before a CFO. Paying for strategy before you have accurate history is the expensive mistake: a fractional CFO handed messy books spends the first two months cleaning them.

What are the triggers for hiring a fractional CFO?

1. You are raising a priced round and need a real model. A small SAFE round can run on a clean P&L and a runway number. A priced round with a lead doing diligence usually needs a driver-based model whose assumptions you can defend line by line.
2. Revenue recognition gets complicated. Annual prepayments, usage-based pricing, multi-year contracts, implementation fees. Once cash collected and revenue earned stop matching, someone needs to own the rules.
3. Your board asks questions you can't answer. If the honest reply to "what happens to runway if the big deal slips a quarter?" is "let me get back to you", you have a forecasting gap, not a reporting gap.
4. You are near 12 months of runway with no plan. That is about when the next raise has to start, and the choice between cutting, bridging and raising deserves a model rather than a gut call.
5. You have more than one entity or operate internationally. Intercompany transactions, foreign payroll and several currencies are where simple books stop being simple.
6. You are taking on debt. Venture debt comes with covenants and reporting obligations. Someone should model the downside before you sign and track compliance after.

One trigger usually justifies a few hours a month. Three at once means you are already late. Bessemer adds two signals from the other direction: preparing for an audit or a fundraise, and a founding team that cannot make accurate cash flow projections over the next six months, quarter or year.

What should you have in place before you hire one?

• A monthly close. Books closed and reconciled by a fixed day each month, every month.
• One source of truth for cash, burn and runway. One written definition of burn and one place the number lives, not three versions across the bank, the accounting tool and a spreadsheet.
• Clean categories. A chart of accounts that separates payroll, contractors, software and one-off costs, so burn can be read by type.
• A short list of decisions. Raise timing, hiring pace, pricing. A fractional CFO without a question to answer turns into an expensive report generator.

With those in place, a fractional CFO spends the first week on the forward-looking work you are actually paying for. They also make your board reporting easier, because the seven numbers a board expects every month already exist and reconcile.

How do fractional CFO engagements usually work?

Most take one of three shapes: a monthly retainer for a set number of hours or days, hourly work on an as-needed basis, or a fixed-scope project around one event such as a raise or a first audit. Bessemer notes that fractional CFOs tend to bill hourly. Typical work includes the operating model and forecast, a monthly review of actuals against plan, the board reporting package, and fundraise support: the model, the financials in your data room, and diligence answers.

Before you sign, ask for references from founders at your stage, ask who actually does the work week to week, and confirm they work in your accounting system. For when to go full-time, Bessemer quotes a fractional CFO's rule of thumb: switch when fractional support costs 75% or more of a full-time salary, or when you expect a big jump in operational or financial complexity. Tax and entity questions still belong with your accountant and lawyer.

Where does Boxsy fit?

Boxsy is not a CFO and does not try to be one. It keeps the numbers that a CFO, an accountant or a founder works from current. The control center pulls the P&L and balance sheet from QuickBooks, bank balances from Plaid and pipeline from HubSpot, and shows cash on hand, burn, runway and KPIs, each with a definition and formula tooltip. Whoever does the finance work starts from live numbers instead of last month's export. See what each plan includes. If you are looking for the accounting or finance firm itself, the ones we recommend to founders are on our preferred partners page.

Fix the books, then buy the judgment

A fractional CFO is worth the money when there is a decision on the table that is bigger than the bookkeeping underneath it. Until then, spend on accurate books, a monthly close and one runway number everyone agrees on. When the first trigger arrives, you will be hiring for judgment rather than cleanup.

If you are not sure which side of that line you are on, talk to our team and we will look at it with you.