A cash flow forecast gives you a clear view of money coming in and going out over the weeks and months ahead. It's one of the most useful tools a small business can build, and it doesn't need to be complicated to be effective.
What a cash flow forecast shows you
At its simplest, a forecast lists expected income and expenses over a set period, usually broken down by week or month, showing your running cash balance throughout. This lets you see in advance if there's a point where you might run short, giving you time to act, whether that's chasing a payment, delaying a cost, or arranging finance ahead of time.
Building your first forecast
Start simple rather than trying to capture everything perfectly. A basic forecast needs:
• Your current cash balance as a starting point
• Expected income, based on confirmed orders, invoices due, and realistic new sales
• Expected expenses, including regular costs like rent and wages, plus one-off costs you know are coming
• A running total showing your projected balance at each point in time
Keeping it realistic
A forecast is only useful if it reflects reality, so it's worth being cautious rather than optimistic, particularly around when customers will actually pay. If customers typically pay late, build that into your forecast rather than assuming they'll pay on the due date. It's better to be pleasantly surprised by cash arriving early than to be caught out by an overly optimistic forecast.
Reviewing and updating regularly
A forecast isn't a one-off document. Update it regularly, ideally weekly, comparing what actually happened against what you predicted, and adjusting your assumptions as you learn more about your business's patterns. Over time, this makes your forecasts more accurate and genuinely useful for spotting problems well before they arrive, rather than reacting to a cash shortage once it's already happening.
Frequently asked questions
How far ahead should a cash flow forecast look?
Most small businesses benefit from forecasting at least three to six months ahead, with the near term broken down weekly and further out months broken down more broadly.
Do I need special software for cash flow forecasting?
Not necessarily. A simple spreadsheet works well to start with, though many accounting software packages include forecasting tools that update automatically as you invoice and pay bills.
How accurate does a cash flow forecast need to be?
It doesn't need to be perfect, just realistic and regularly updated. The value comes from spotting trends and potential gaps early, not from predicting exact figures precisely.
