Building a Finance Function from Scratch: What to Prioritise First

Start with clean books

Everything in finance depends on accurate underlying data. Before building anything else - before hiring a CFO, before building models, before implementing reporting - get your books clean and current. This means a proper chart of accounts, reconciled accounts, consistent categorisation, and a monthly close process that actually closes. Without this foundation, every other financial tool is built on sand.

The instinct for most founders is to hire a CFO first because that feels senior and strategic. This is almost always wrong at early stages. Without clean books underneath, a CFO has nothing reliable to analyze. The first hire or outsource should be someone producing accurate monthly financials, not someone producing strategy decks off bad numbers.

Clean books at this stage means: bank accounts reconciled monthly, revenue categorized correctly, expenses classified consistently, tax returns filed, and basic financial statements produced monthly within 15 days of close. If any of these are missing, adding strategic finance on top is premature. Fix the foundation first.

Add oversight before strategy

The next layer after clean bookkeeping is controller-level oversight: someone who reviews the books, catches errors, ensures internal controls are followed, and produces reliable monthly financial statements. This is about accuracy and integrity, not strategy. Many businesses skip this layer and try to go straight from bookkeeper to CFO - which means the CFO is spending time on accuracy problems rather than on strategic work.

Oversight is the layer between bookkeeping and strategy. It answers questions like: are the numbers right, what changed this month, what should we be paying attention to. A controller or senior accountant does this work. Without it, the CEO is either flying blind or trying to do controller-grade review themselves, which is a poor use of CEO time.

The pattern we see working: bookkeeper (15 hours/month at ~$50-75/hour) plus controller oversight (10-15 hours/month at ~$150-200/hour). Total spend $3-4K/month for reliable monthly financials with variance commentary. This combination is strictly better than a single mid-level hire at the same cost because it covers both the transactional and review layers.

Then add strategy

With clean books and reliable oversight, you can add CFO-level strategic work: financial modelling, scenario analysis, fundraising support, board reporting, and capital allocation advice. This is where the financial function starts to drive decisions rather than just record them.

Strategy becomes relevant when the basic questions are being answered. Now the CEO starts asking forward-looking questions: what if we hire another 5 engineers, can we afford to wait on the raise, what is our runway under different scenarios. A fractional CFO is the right layer for this. The CFO uses the clean numbers the controller is producing to model decisions.

The fractional CFO engagement typically runs $4-8K per month at this stage. Combined with bookkeeping and controller work, you are spending $7-12K/month on finance at a company doing $3-10M in revenue. That is typically 2-4% of revenue, which is in line with healthy mid-market finance spend.

The team structure at different stages

Under $1M: founder handles finances with basic bookkeeping support. $1M-$3M: dedicated bookkeeper or small firm handles day-to-day with periodic CPA oversight. $3M-$10M: fractional controller and fractional CFO working in coordination. $10M-$20M: full-time controller, fractional or part-time CFO. Above $20M: full-time controller, full-time CFO, and supporting staff. These are ranges, not rules - the right structure depends on the complexity of the business, not just revenue.