Why cash-flow kills more businesses than losses
Profitable companies go bust every year. It sounds paradoxical, but the explanation is simple: profit is an accounting concept; cash is reality. A business can show healthy profits while simultaneously running out of cash because receivables are slow, inventory ties up capital, or growth requires upfront investment before revenue arrives. Cash-flow forecasting closes this gap.
The 13-week rolling forecast
The most practical tool for SMEs is a 13-week rolling cash-flow forecast. This covers a full quarter with weekly granularity. Each week, you update the forecast with actuals and extend it by one week. The discipline of weekly updates means you always have 90 days of visibility, and deviations from plan are caught early enough to act on.
What to include
Your forecast should capture every cash inflow and outflow: customer receipts by expected payment date (not invoice date), payroll, rent, supplier payments, tax obligations, loan repayments, and capital expenditure. The key insight is timing. A £50K invoice means nothing if it won’t be paid for 60 days but your payroll is due in 14.
Scenario planning
A single forecast is a guess. Three scenarios — best case, likely case, worst case — are a strategy. Vary your assumptions around sales conversion, payment timing, and costs. This gives you a range of outcomes and lets you identify the point at which you’d need to take action, such as drawing on a credit facility or delaying a hire.
Common mistakes
The three most common forecasting mistakes are: optimism bias on receivables (assuming everyone pays on time), forgetting lumpy costs like annual insurance or quarterly VAT, and failing to update the forecast weekly. A forecast that isn’t maintained is worse than no forecast at all because it creates false confidence.
Getting started
If you don’t currently forecast cash flow, start with a simple spreadsheet. List your bank balance today, then project 13 weeks of inflows and outflows. Within two weeks of maintaining this discipline, you’ll have more financial clarity than most SMEs ever achieve. If the process reveals complexity you can’t manage alone, that’s exactly when a fractional CFO earns their fee.