One of the first questions founders ask when they engage a fractional CFO or financial clean-up service is: how long will this take? It's a reasonable question. The honest answer is: it depends — but there's a predictable range based on how far back the disorganisation goes and how complete the underlying records are.

Understanding what affects the timeline helps you set realistic expectations and make better decisions about when and how to prioritise a financial clean-up.

What drives the timeline

The single biggest driver of clean-up timeline is the quality of the underlying records. A business that has been running transactions through a single bank account with consistent descriptions, using an accounting system consistently even if incorrectly categorised, and keeping supplier invoices filed, is much faster to clean up than one where transactions have flowed through multiple accounts, some expenses were paid personally and never reconciled, and historical invoices exist only in someone's email inbox.

The second biggest driver is how far back you need to go. If the goal is clean historical financials going back 12 months, the work is bounded and manageable. If you need three years of clean financials to support a fundraise or an acquisition process, and the first two of those years were managed with minimal discipline, the scope expands significantly.

Typical timelines by situation

For a business that has been trading for 12–18 months with reasonable but imperfect record-keeping — transactions in an accounting system but inconsistently categorised, bank reconciliations done occasionally rather than monthly, some historical invoices missing — a full clean-up typically takes 3–5 weeks with a dedicated finance resource. The output is clean historical financials, a restructured chart of accounts, and a documented close process to keep them clean going forward.

For a business with 2–3 years of trading history, mixed record-keeping quality, and potentially some periods where no accounting system was in use at all, the timeline extends to 6–10 weeks. These projects often surface surprises — historical transactions that were categorised in ways that materially change the reported profitability of the business — which need to be investigated and resolved before the clean financials can be signed off.

What happens during a clean-up

A financial clean-up has three phases. The first is assessment: understanding what exists, what's missing, what's incorrect, and what the target state should look like. This phase typically takes 3–5 days and produces a clear scope and timeline for the rest of the work.

The second phase is reconstruction: going through historical transactions, categorising them correctly, reconciling bank accounts, tracking down missing invoices, and building the clean historical record. This is the most time-consuming phase and the one where quality of source data has the biggest impact on speed.

The third phase is forward infrastructure: setting up the chart of accounts, documenting the close process, and establishing the reporting templates that will keep the books clean going forward. This phase is shorter but arguably more important — because a clean-up that doesn't produce a sustainable process will need to be repeated.

When to start

The best time to start a financial clean-up is before you have a deadline that depends on it. Raising a round, running a diligence process, or bringing in a new CFO are all events that will surface financial chaos — and doing the clean-up under time pressure, with a deal on the line, is both more expensive and more stressful than doing it proactively. If you know a significant financial event is coming in the next 6–9 months, start the clean-up now.