What-If Analysis
What-if analysis tests how one or more changed assumptions or inputs affect modeled outcomes relative to a stated baseline.
A what-if result is conditional. It does not change recorded financial reality, prove that the assumption will occur, or automatically become the approved plan.
Start from a supported baseline, change the named input or inputs, recalculate deterministically, and compare the outcome delta. Keep the changed assumptions visible so the result can be reproduced and challenged.
Change the assumption, not the recorded reality
The calculation is deterministic even when the assumption is uncertain.
- 01Supported baseline
Current recorded facts and explicit planning state
- 02Changed assumption
One or more named values, dates, events, or policies
- 03Deterministic recalculation
The same inputs and rules produce the same conditional output
- 04Outcome delta
Difference from the baseline under the changed assumptions
- 05Compare and decide
Human review of consequences, confidence, constraints, and next action
What is What-If Analysis?
What-if analysis asks how a modeled outcome changes when one or more explicit inputs or assumptions change. The input might be an amount, date, hiring decision, price, collection delay, commitment, funding event, growth rate, or another supported variable.
Changing exactly one input is often called sensitivity analysis when the purpose is to measure the response systematically. What-if analysis can change one or several inputs to answer a specific question. Scenario analysis usually compares coherent sets of alternative assumptions, while Scenario Planning is the broader process of designing alternatives and preparing decisions.
The calculation can be deterministic without making the assumption certain. A delayed receipt case, for example, can be reproduced exactly from its inputs while the real collection date remains unknown. The model should show the changed assumptions and preserve the baseline for comparison.
What-If Analysis versus related methods
Sensitivity Analysis
Systematically changes selected variable values to observe how the outcome responds.
Scenario Analysis
Compares coherent alternative assumption or event sets against a shared baseline.
Scenario Planning
Designs plausible alternatives, models their implications, and prepares decisions or contingencies.
Forecast
Represents an expected path under a defined forecasting method rather than a question-driven alternative alone.
A useful what-if question names the change
“What if cash gets worse?” is too vague. “What if the $80,000 customer receipt moves from June to August while payroll and commitments stay unchanged?” names the value, timing, and held-constant assumptions. That makes the result reviewable.
Keep hypothetical and canonical states separate
A Scenario should not silently overwrite Treasury, recorded receipts, actual payroll, commitments, the approved budget, or another canonical record. If the event later occurs, update the owning workflow through its supported process.
Why it matters
What-if analysis helps a team understand consequence before commitment. It can reveal which assumptions have the largest effect, where timing creates pressure, and which options deserve deeper operational review.
The output is only as useful as the baseline, changed assumptions, calculation rules, and decision context. It should inform judgment, not replace it.
What goes into it
- A supported baseline and as-of date
- One or more explicit changed assumptions
- The calculation rules and values held constant
- Outcome measures and comparison horizon
- Clear separation from canonical actuals and approved plan states
Illustrative collection-timing question
The baseline includes an $80,000 customer receipt in June. A what-if case moves that receipt to August while leaving payroll and recorded commitments unchanged. The recalculated path shows the two-month cash difference and runway effect. The customer receipt remains expected, not realized, in both cases.
How RunwayCal helps
RunwayCal Scenarios keeps hypothetical changes separate from the canonical financial baseline and recalculates supported cash, burn, and runway outcomes under those assumptions. Teams can compare the result with the current path before deciding whether to act.
RunwayCal does not predict which case will occur or convert a Scenario into recorded reality automatically.
Common mistakes
- 1Defining what-if analysis as changing exactly one input in every case.
- 2Changing several assumptions without naming each one.
- 3Treating a deterministic result as a prediction.
- 4Overwriting recorded actuals or the approved plan with a hypothetical case.
- 5Comparing outcomes built from different baselines, horizons, or calculation rules.
Get the Financial Clarity Newsletter
Practical tips on cash flow, runway, and financial decisions for founders, business owners, CFOs, investors, and board members. Free, weekly, no spam.
Test the change without rewriting the baseline.
Keep assumptions visible, recalculate deterministically, and compare conditional outcomes before making the real decision.
Explore Scenarios