A simple cash flow forecast for small businesses

By Tracey Hargraves ACAUpdated 5 min read

In short

  • Profit and cash are different. A profitable business can still run out of money.
  • A rolling 12-week forecast is the simplest, most useful starting point.
  • Update it weekly and compare it with what actually happened.

Start with your opening bank balance

Use the real balance across your business accounts today. Everything else builds on this figure.

List money in and money out by week

Be realistic about when customers actually pay, not when you invoice them. Include:

  • Customer receipts, based on real payment habits
  • Wages, rent, suppliers and loan repayments
  • VAT, PAYE and corporation tax payments on their due dates
  • One-off costs such as equipment, insurance renewals or drawings

Use it to make decisions

The forecast shows your lowest point ahead of time. That gives you options: chase a debtor, delay a purchase, or arrange funding before you need it rather than in a panic.

Figures are based on HMRC guidance for the 2026/27 tax year and were checked on 28 September 2026. This guide is general information, not personal advice.

How Acton Cliff can help

See what is coming, so cash never catches you out. Talk it through with Tracey. A ten-minute call is usually enough to work out your next step.

Let's have a proper conversation about your numbers

No jargon, no obligation. Tell us where you are and we'll tell you honestly how we can help.

Prefer email? info@actoncliff.co.uk