A cash flow forecast is one of the most practical financial tools available to any business owner, yet many founders either skip it entirely or produce one only when a lender or investor asks for it. Understanding what a cash flow forecast is and how to use it as a live management tool — rather than a one-off document — changes how a founder relates to their business finances.
A cash flow forecast is a forward-looking projection of the money expected to flow into and out of a business over a defined period, typically presented week by week or month by month. It shows when income is likely to be received, when costs fall due, and what the resulting cash balance is expected to be at each point. A good forecast lets a founder anticipate when the business may run short of cash and take action before the gap becomes a crisis.
Cash flow forecasts are most useful when maintained as rolling documents — updated regularly with actual figures and extended forward as new information becomes available. A forecast built and filed once is significantly less valuable than one reviewed and revised every month. Our guide to building a cash flow forecast covers the structure, inputs, and practical use of forecasting for UK founders.