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Forecast cash by the dates money is expected to enter and leave the business—not just by sales or expenses recorded. Start with actual cash, map receipts and payments period by period, and create separate base and downside scenarios for uncertain demand, service costs, and collection timing. The lowest projected balance, and when it occurs, gives you a practical early-warning point for decisions.
What a cash-flow forecast shows
A cash-flow forecast estimates cash entering and leaving the business over time, along with the balance remaining in each period. It answers a different question from an income statement or a list of invoices: a sale may be recorded before the customer pays, while payroll or supplier bills may be due before the related work is collected.
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Build the forecast around expected cash dates. Choose monthly, weekly, or daily periods according to how closely you need to manage liquidity and when your billing, payroll, tax, and supplier payments fall. Monthly periods are common, but a shorter cadence can make a near-term cash pinch visible sooner. A longer view can help with strategic planning.
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Build the forecast from cash dates
- Set the opening balance. Use the current bank balance as the starting point. If you track more than one account, define which balances are included and use that definition consistently.
- List expected receipts. Record the amount and period when cash is expected to arrive, not merely when work is invoiced. Include relevant customer payments, contract milestones, or other business receipts.
- List expected payments. Enter payroll, contractors, suppliers, rent, tax, and other outflows in the periods when payment is expected. Include both the amount and timing of costs that may change with workload.
- Calculate each closing balance. For each period, add expected receipts to opening cash and subtract expected payments. Carry that closing balance forward as the next period’s opening balance.
- Keep assumptions visible. Note the basis for demand, project dates, prices, collection timing, labor needs, and supplier costs. A forecast is easier to update and explain when its inputs can be traced to contracts, booking patterns, payment history, or other relevant indicators.
New Zealand’s Business.govt.nz guide to cash-flow forecasting describes preparing a forecast in a spreadsheet or accounting software. The format matters less than being able to see the timing, assumptions, and changing cash balance.
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Make demand and service costs explicit
For demand, estimate the volume and timing of booked work, likely new work, renewals, or projects. Record whether an amount is contracted, scheduled, or only an estimate; those are not equally certain. Account for seasonality or known delays where relevant, and identify the evidence behind the estimate.
For delivery costs, list the staffing, contractor, supplier, and other costs required to serve that workload. Distinguish fixed or committed costs from costs that rise or fall with the amount of work. Include when those costs are likely to be paid: a higher workload can increase cash receipts, but it may also require labor or materials to be paid before customers settle their invoices.
Business Queensland’s budgets and forecasts guidance emphasizes documenting assumptions and considering relevant non-financial information. For a service business, indicators might include confirmed bookings, project milestones, staffing availability, or a change in supplier terms. Use indicators that actually inform your own forecast rather than treating any single signal as certainty.
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A base case is a working estimate, not a promise. Add a downside case when uncertainty could materially change the cash outlook; add an upside case if it would inform a real capacity or spending decision. Change a small number of assumptions at a time so you can see what drives the difference.
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| Assumption to compare | Base case | Downside case |
|---|---|---|
| Demand and workload | Expected volume and project timing, with the basis noted | Lower volume, delayed starts, or rescheduled work where plausible |
| Price or contract timing | Expected rates, milestones, and payment terms | Any credible delay or change that shifts the amount or date of receipts |
| Labor and supplier costs | Expected cost level and payment timing for the planned workload | Higher costs, added staffing needs, or earlier payment dates where plausible |
| Customer collections | Expected receipt dates based on the available evidence | Slower receipts or a greater share of late payments, if relevant |
| Cash result | Lowest projected balance and the period it occurs | Lowest projected balance and the period it occurs |
| Available response | Actions still feasible before the low point | Actions still feasible before the low point |
These are controlled alternatives, not predictions that every downside will happen at once. Choose assumptions that fit your business and make the consequence visible. The Department for Education in England recommends presenting a range where the outlook is materially uncertain, including base, best, and worse cases, in its management accounts good practice guide for colleges. That guide is written for colleges in England; the scenario-planning principle is useful more broadly, but its institutional guidance should not be mistaken for a universal business rule.
Use the lowest balance to plan action
For each case, identify the lowest projected cash balance and the period in which it falls. A positive closing balance at the end of a month can conceal a shortfall earlier in that month, so use sufficiently short periods if the timing of payroll, bills, or receipts makes that distinction important.
If a scenario points to a likely squeeze, consider what could be done before it arrives: follow up an overdue receivable, review the timing of discretionary spending, or revisit planned commitments. These are options to assess against actual obligations, contracts, and local rules—not automatic recommendations. Australia’s business.gov.au guidance on improving cash flow discusses practical cash-flow management steps.
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Roll the forecast forward and learn from misses
Update the forecast on a cadence that matches the decisions you need to make. The Department for Education’s England college guide says, “You should keep an up-to-date rolling cashflow forecast and report this in each month’s accounts.” Its monthly reporting advice is specific to its college context; a service business can apply the rolling-forecast idea at a frequency suited to its cash risks.
- Replace forecast figures for completed periods with actual receipts, payments, and closing cash.
- Compare actual results with the forecast and identify the main differences, such as a late customer payment, a project shift, an unexpected staffing cost, or a changed workload.
- Decide whether each difference is a timing variation or evidence that the underlying demand or cost assumption has changed.
- Revise assumptions and dates for remaining periods, then recalculate each scenario’s cash balance and low point.
Queensland’s budgets and forecasts guidance and Victoria’s cash-flow forecasting guidance provide additional government guidance on forecasting and review. Acquisition.gov’s cash flow forecast regulation applies to a specific U.S. federal contracting context; its emphasis on reviewing and supporting forecast information should not be read as a legal requirement for every service business.
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