Move beyond optimistic, base, pessimistic
The traditional three-scenario approach -- optimistic, base, pessimistic -- has a fundamental flaw: it treats the future as a single dimension that can be better or worse. Reality is multi-dimensional. Revenue might exceed expectations while costs also exceed expectations. A new customer might arrive just as a key supplier fails.
The three scenarios every CFO should maintain are more nuanced: the operating plan, the stress case, and the strategic option.
Scenario 1: The operating plan
This is your base forecast -- the most likely outcome given current trajectory and known commitments. It is not optimistic or pessimistic; it is realistic.
Key characteristics:
- Built from current run rates and committed changes (signed deals, approved hires, contracted costs)
- Updated monthly with latest actuals
- Used for operational management, monthly reporting, and board updates
The discipline: The operating plan should be the forecast you would stake your reputation on. If you would not bet your own money on it, the assumptions need work.
Scenario 2: The stress case
The stress case models a plausible downside -- not a catastrophe, but a scenario that pressure-tests the business's resilience.
Common stress assumptions for a SaaS business:
- New customer acquisition drops by 30-40%
- Existing customer churn increases by 50%
- A major customer (top 5-10% of revenue) is lost
- Payment cycles lengthen by 15-30 days
- A planned fundraise is delayed by two quarters
The purpose: The stress case answers "can we survive this, and what levers do we pull?" It informs contingency planning: which costs can be cut quickly, how much cash runway remains, what covenants or commitments are at risk.
The discipline: Update the stress case quarterly. The specific stress assumptions should evolve as the risk landscape changes.
Scenario 3: The strategic option
This scenario models a specific strategic decision the business is considering: an acquisition, a new market entry, a major product investment, or a significant restructuring.
Key characteristics:
- Tied to a real decision with a defined timeline
- Models both the investment required and the expected return
- Shows the incremental impact versus the operating plan
- Includes an explicit go/no-go framework (e.g., "we proceed if payback is under 18 months")
The purpose: Strategic options give the board a clear framework for evaluating investments. Instead of debating in the abstract, they can see the financial impact modelled against realistic assumptions.
The discipline: Retire strategic option scenarios once the decision is made or the opportunity has passed. Replace with the next decision on the horizon.
Presenting the three scenarios
When presenting to the board, show the three scenarios on a single page:
- Summary metrics (revenue, EBITDA, cash) for each scenario side by side
- Key assumptions that differ between scenarios, highlighted
- Decision points: what triggers a shift from operating plan to stress case responses, or what conditions justify pursuing the strategic option
This framework keeps scenario analysis focused, actionable, and manageable -- even for a finance team of one.