Calculator · Cash Flow
Cash Forecast Error Calculator
Reconcile actual closing cash against a forecast using signed receipt and payment differences, with explicit percentage bases.
Formula and cost boundary
Closing-cash error = (actual receipts − forecast receipts) − (actual payments − forecast payments)
This bridge assumes actual and forecast share the same opening cash. If opening cash changed, add that opening-balance error separately before interpreting the reconciliation. A positive payment error means more cash paid than forecast, so it reduces closing cash. Percent errors use the respective forecast amount as denominator; a zero forecast makes that ratio undefined even when a dollar error exists. The tool measures one period, not average forecast accuracy or causal explanations. Payment delays can improve closing cash while leaving obligations unpaid.
Worked example: Fewer receipts and more payments
The following inputs are hypothetical values for checking the calculation. They are not recommended prices, wages, margins or platform charges. Keep the units and period shown in each label when replacing them with your own records.
| Input | Example value |
|---|---|
| Common opening cash | $5,000 |
| Forecast receipts | $20,000 |
| Actual receipts | $18,000 |
| Forecast payments | $15,000 |
| Actual payments | $16,000 |
| Result | Calculated value |
|---|---|
| Actual closing cash minus forecast closing cash | −$3,000 |
| Actual closing cash | $7,000 |
| Receipt error | −$2,000 |
| Payment error | $1,000 |
| Receipt error / forecast receipts | -10% |
| Payment error / forecast payments | 6.67% |
Using the result
Save the input set alongside the source date of each quote or cost record. Review the cost boundary before comparing this result with another report: a contribution measure may exclude overhead, and a cash measure follows payment dates. Display rounding does not change the underlying assumptions. Recalculate when an input changes; the tool does not predict future sales or collections.
Are any rates supplied automatically?
No. Numeric fields are your inputs. Example values demonstrate arithmetic only. Check your contracts and records for the amounts that apply to your business.
Why might a result be unavailable or negative?
A missing denominator or inconsistent inputs can make the calculation undefined. Those combinations are rejected or labeled explicitly. A valid negative result remains visible because it may identify a loss or cash shortfall.
Method reference: OpenStax: Flexible Budgets. Checked October 22, 2026. Comparison of assumptions and actual activity; no prediction or recommended error threshold.
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