Cash flow forecasts

A cash flow forecast is an estimate of the future cash inflows and cash outflows of a business over a period, used to predict its cash position (closing balance) month by month.

One method is to collect trade receivables faster — for example by offering customers a cash discount for early payment. This brings cash into the business sooner, improving the cash balance in shortfall months. The trade-off is that the discount reduces the revenue received per sale, so it must be set carefully.

The first purpose is to identify cash shortfalls in advance. By predicting the closing balance each month, the forecast shows which months the business will run short of cash, giving managers time to act — for example by arranging an overdraft or delaying a payment — before the shortage becomes a crisis.

The second purpose is to support an application for finance. Banks usually require a cash flow forecast before granting a loan or overdraft, because it demonstrates that the business can manage its cash and repay what it borrows. A realistic forecast therefore makes it easier to obtain the finance the business needs.

Together these purposes help the business plan its cash carefully and reduce the risk of becoming insolvent, although the forecast is only as reliable as the assumptions behind it.

A cash flow forecast predicts a new business's future cash inflows and outflows, and for a vulnerable new venture it is highly valuable.

Its main value is early warning of cash shortages. New businesses are especially at risk of running out of cash because they pay heavy start-up costs before steady revenue arrives, and they have few reserves. By showing which months the closing balance turns negative, the forecast lets the owner act in advance — arranging an overdraft, delaying a purchase or chasing customers — rather than facing sudden insolvency. It is also essential for raising finance: banks require a forecast before lending, so a credible one helps secure the start-up capital the business needs, and it provides a target against which actual cash can later be monitored.

However, its value has limits. A forecast is only as good as its assumptions, and new businesses find these hard to estimate accurately — sales are uncertain and costs can be under-predicted, so the forecast may be over-optimistic. External shocks can also quickly make it inaccurate, and it shows cash only, not whether the business is profitable.

Therefore a cash flow forecast is very valuable to a new business for spotting cash problems and raising finance, but its usefulness depends on the accuracy of its assumptions. It is a necessary planning tool, not a guarantee — most useful when combined with realistic data and sound management.

Facing a predicted shortfall, the business has several options, each with benefits and drawbacks.

It could arrange a bank overdraft to cover the shortfall months. This is flexible and quick, providing cash exactly when needed, but it carries interest costs and the bank can demand repayment, so it suits a temporary problem rather than a lasting one. It could speed up cash inflows by chasing receivables and offering early-payment discounts: this directly raises the cash balance, though discounts cut revenue and aggressive collection may lose customers. It could delay or reduce outflows — taking the full supplier credit period and postponing non-essential spending such as buying equipment — which keeps cash in the business at no interest cost, but risks supplier goodwill if overdone. Finally, sale and leaseback of a fixed asset raises a cash lump sum while keeping use of the asset, though it brings ongoing lease payments and loss of ownership.

Judgement. The best action depends on whether the shortfall is temporary or structural. If it is a one-off timing problem (e.g. a delayed customer payment), an overdraft combined with faster receivables collection is sensible and low-risk. If the shortfall reflects a structural weakness — the business consistently spends more than it collects — then borrowing only delays the problem, and the firm must tackle the underlying cause by improving its working-capital cycle (faster receivables, tighter stock control, lower costs). The most defensible approach is therefore a combination matched to the cause: short-term finance to bridge an immediate gap, alongside structural improvements to inflows and outflows so the shortfall does not recur. Relying on a single quick fix, especially borrowing, is the weakest response.

A cash flow forecast predicts a business's future cash inflows, outflows and closing balances, helping it anticipate its cash position. Whether it prevents a business running out of cash depends on how accurate it is and how the business acts on it.

The case that a forecast helps prevent running out of cash. Its great strength is early warning. By showing which months the closing balance will turn negative, the forecast gives managers time to act before the shortfall occurs — arranging an overdraft, chasing receivables, delaying payments or postponing spending. This is especially valuable for new and fast-growing firms, which are most at risk of overtrading. The forecast also imposes discipline: it forces managers to plan the timing of large payments and to monitor actual cash against the plan, catching problems early. In this sense, a well-used forecast is one of the most effective tools a business has for avoiding a cash crisis.

The case that a forecast cannot guarantee it. A forecast is only a prediction based on assumptions. If sales are over-estimated or costs under-estimated, it will be wrong, and an over-optimistic forecast can give false reassurance. External shocks — a recession, a key customer's failure, a sudden cost rise — can make any forecast inaccurate overnight. Crucially, the forecast itself does nothing: it only prevents a cash shortage if managers act on its warnings and have access to finance to do so. A business that prepares a perfect forecast but cannot obtain an overdraft, or ignores the warning, will still run out of cash. The forecast identifies the problem; it does not solve it.

Weighing it up (criterion). The extent to which a forecast prevents running out of cash depends on (a) the accuracy of its assumptions and (b) whether management acts on it with access to finance. Where assumptions are realistic and managers respond promptly, a forecast can largely prevent cash shortages. Where assumptions are poor, shocks occur, or no action/finance is available, it cannot.

Judgement. Preparing a cash flow forecast helps prevent running out of cash to a significant extent — but it cannot guarantee it. It is a powerful early-warning and planning tool, and businesses that use one are far better placed to avoid a cash crisis than those that do not. However, it is necessary but not sufficient: prevention also requires accurate assumptions, prompt managerial action and access to finance. The most defensible conclusion is that a cash flow forecast greatly reduces the risk of running out of cash, but only when it is realistic and acted upon — it is a tool for managing cash, not a guarantee of solvency.