Practical finance utilities
Tools
A disciplined way to use calculators, checklists and reference data in finance decisions.
A finance tool is useful only when its definition, inputs and assumptions are visible. Use this page as a practical check before relying on a calculator, model, checklist or benchmark.
A five-point tool check
- Frame the decision. State the question the output must help answer and who owns that decision.
- Define every measure. Confirm the formula, period, unit, scope and exclusions before entering data.
- Trace the inputs. Record the source, extraction date, owner and any manual adjustment.
- Test the assumptions. Run a reasonable range instead of treating one estimate as certain.
- Record the outcome. Save the version used, the decision made and the condition that would trigger a review.
Minimum decision record
| Field | What to capture |
|---|---|
| Decision | The action, owner and decision date. |
| Definition | The formula, unit, period and boundary. |
| Evidence | Source, access date and any transformation applied. |
| Assumptions | Known estimates, dependencies and sensitivity range. |
| Review trigger | The event or threshold that requires the decision to be revisited. |
Use the supporting resources
Read the Finance Circuit Methodology for our evidence approach, or browse decision resources by subject and format.