Track a running cash balance across a sequence of periods from expected inflows and outflows, and see whether you dip negative or breach an overdraft limit.
Données vérifiées · July 2026
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A cash flow forecast carries an opening balance forward period by period, adding expected receipts and subtracting expected payments to build a running balance. This calculator flags the lowest point the balance reaches, how many periods dip into deficit, and whether any period would breach an available overdraft limit — the earliest possible warning of a cash squeeze.
£10,000 opening balance, inflows of £10,000/£8,000/£12,000 and outflows of £9,000/£11,000/£7,000 across 3 periods: balance dips to £8,000 in period 2 but never breaches a £5,000 overdraft limit.
Enter your opening cash balance for the first period.
Enter expected cash inflows for each period (comma-separated).
Enter expected cash outflows for each period (comma-separated, same order as inflows).
Enter your overdraft limit if you have one, to see if the forecast breaches it.
Last data update
July 7, 2026
Sources and references
ICAEW / ACCA management accounting — cash flow forecasting method; generic treasury practice on running balance and overdraft headroom monitoring.
The data in this calculator is updated regularly to reflect the latest official rates. When in doubt, consult the official sources listed above.
The forecast runs for as many periods as there are inflow entries — any missing outflow for a period is treated as zero, so make sure both lists cover the same periods in the same order.
Not necessarily — check the lowest balance and periods in deficit too, since a healthy closing position can still hide a dip that breaches your overdraft limit mid-way through.