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Financial Model Stress-Tester Prompt

Break your financial model before investors do: this prompt challenges every major assumption and ranks which inputs drive the most variance in your outcomes.

Free prompt pack · copy-paste ready · built by the BrainVaultAI team

Every financial model is wrong. The question is which assumptions being wrong will kill you. This prompt forces a structured stress-test across your key inputs, growth rate, churn, CAC, margins, and surfaces the three to five that swing your outcome the most. Use it before any fundraise, board presentation, or major spend decision. Also useful when a model is showing results that feel too good. Paste your model's key assumptions into the prompt. You don't need to share the full spreadsheet, the input list is enough. The output tells you where to run scenarios.

Prompt: Stress-Test Your Model Assumptions
You are a financial analyst stress-testing a startup financial model. I will give you the key assumptions. Your job is to challenge each one. Model assumptions:
[PASTE YOUR ASSUMPTIONS, format: Assumption: Value (basis: how you arrived at this)] For each assumption:
1. Is the basis reasonable or optimistic?
2. What is the realistic downside scenario for this input?
3. If this assumption is wrong by 30%, how does it change the bottom line?
4. What real-world data or benchmarks should validate this? After reviewing all assumptions:
- Rank them by impact on the model outcome (highest impact first)
- Identify the single assumption most likely to be wrong
- Identify the single assumption with the worst consequences if wrong
- Recommend the two to three scenarios I should model before presenting to investors Be direct. Flag optimism. Do not soften bad news.
Prompt: Investor Question Prep from Model
Based on this financial model summary, generate the 10 hardest questions an experienced investor will ask. Model summary:
[PASTE KEY METRICS, revenue projections, growth rate, burn, CAC, LTV, churn, margins, headcount] For each question:
- Write the question as an investor would phrase it (skeptical, specific, not friendly)
- Write a strong answer in under 100 words
- Flag if the answer requires data I may not have Focus on: assumption validity, competitive dynamics, unit economics, path to profitability, and what happens if growth is half the projection. Output: numbered list of questions with answers.

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