Keep an assumption log beside a cash scenario
AI-assisted editorial field note · Educational planning framework
What should a cash assumption log record?
Record the source, confidence, timing and review trigger for material estimates. A cash sheet can produce precise totals from uncertain inputs, so the assumptions need to remain visible. The log helps a reviewer identify which changes could alter the result most. It also separates actual records from a planning scenario and supports discussion with an appropriate finance professional.
Put it into practice
Identify material inputs
Focus on receipts, costs and obligations that could change the decision. Avoid a long list of trivial estimates that obscures the most important uncertainty.
Record the basis
Label a figure as an actual record, agreed term, estimate or hypothetical scenario. Link the relevant source without exposing unnecessary confidential details.
State the review trigger
Use an invoice status change, new commitment or updated operating record. Include who maintains the assumption and when it was last considered.
Test sensitivity
Change one meaningful input at a time to understand its effect. Keep combined scenarios clearly labelled rather than treating them as a calculated probability.
A worked example
Illustrative scenario — not a customer case study
A scenario assumes one customer receipt on a Friday and constant monthly operating costs. The log marks the receipt as unconfirmed and the cost level as an average. A reviewer can immediately ask about timing and a known irregular payment instead of trusting the headline closing balance.
Make the next decision
Use the scenario when its material assumptions are inspectable and the decision can tolerate their uncertainty. Obtain stronger evidence or professional review when the consequence is significant.
A mistake to avoid
Do not attach probability labels without a defensible basis. A case named 'likely' is still an assumption unless evidence supports that confidence.
Must every number have the same confidence?
No. Actual receipts, contracted obligations and hypothetical sales have different evidence. The log should preserve those differences instead of making all inputs look equally certain.
Primary sources and further reading
- U.S. Small Business Administration: managing finances
Introductory further reading. Jurisdiction-specific accounting and obligations require appropriate professional review.
Take the next step
Check the broader business context with the free six-question assessment. Use your own evidence to choose the next action.
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