Why it matters
It gives you time to act on a funding gap, slow collection or a large tax payment. A useful forecast explains assumptions and is updated against actual results. Short weekly forecasts support immediate decisions; longer monthly views help with growth plans. Choose a level of detail that someone can maintain consistently rather than building a spreadsheet no one updates.
A practical example
Opening cash of £8,000 plus expected receipts of £6,000 less payments of £9,000 leaves £5,000. If the largest customer pays two weeks late, the low point may be very different. Move that receipt in a cautious scenario and see what action would be needed.
A common misunderstanding
A forecast is not a guarantee and should not treat an unapproved loan as available cash. It also should not use invoice dates where collection dates are what matter. Record the assumptions so changes can be checked rather than buried in totals.
General information for UK readers, updated 3 November 2026. Examples are illustrative. Tax treatment depends on the facts and current rules; seek advice before making a decision.