In the pack: ChatGPT, Claude & Gemini Prompts to Write a Business Plan
Assumptions Register: Every Number Your Forecast Relies On
Prompt
My business and stage: {{BUSINESS_SUMMARY}}
My draft assumptions (prices, volumes, growth, costs, payment terms, wages, rent, loan terms): {{DRAFT_ASSUMPTIONS}}
Evidence I have for each: {{ASSUMPTION_EVIDENCE}}
Produce:
1. An assumptions register table: ID, assumption, value, unit, source or evidence, confidence (high, medium or low), and what it drives in the forecast.
2. Assumptions I've missed that a forecast for this kind of business needs, such as card fees, bad debts, seasonality, owner pay, equipment replacement and sales-tax timing. List them with [NEEDS FIGURE], not a number.
3. The five assumptions the result is most sensitive to, with a plain reason for each.
4. For each low-confidence assumption, a quick way to firm it up (a quote, a test, an interview, a supplier call).
5. A clean version I can paste into a spreadsheet tab.
Rules: never fill a gap with a typical industry figure. Keep my numbers exactly as given; if two contradict each other, flag it. Educational, not financial advice.
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About this prompt
“Assumptions Register: Every Number Your Forecast Relies On” is a free prompt for ChatGPT in the Business category, 184 words long, added to The Prompt Index on October 28, 2026 by The Prompt Index. Copy it with the button above, paste it into ChatGPT or any other AI chat assistant, and send it.
It has 3 placeholders to fill in first:
{{BUSINESS_SUMMARY}}, {{DRAFT_ASSUMPTIONS}}, {{ASSUMPTION_EVIDENCE}}.
Use the “Customize this prompt” fields to personalise it before you copy.
Recommended models: ChatGPT, Claude, Gemini.
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