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A direct cash forecast is opening balance plus receipts less payments. The useful output is not the closing figure but the headroom against your minimum operating buffer, because that is what tells you whether and when a facility must be drawn.
Closing cash
Closing = Opening cash + Receipts - Payments
Headroom
Headroom = Closing cash - Minimum buffer
Weekly for 13 weeks is the standard treasury horizon. Monthly forecasts hide intra-month troughs around payroll and tax dates.
Because receipts slip and payments do not. A buffer of two to four weeks of outflows is a common minimum.