20 tested prompts across 4 stages. Works with ChatGPT, Claude, and Gemini.

Getting Claude for Business Plans right takes more than a single prompt. This 4-stage guide covers Define the Business and Model, Write the Core Business Plan Sections, Build the Financial Model, and more, breaking the whole process into focused steps where each prompt builds on the last. Most first-time business plan writers either produce a generic template they found online or get so deep in the weeds they never finish. These prompts use Claude to think through the business model systematically, stress-test the key assumptions, write clear and compelling sections, and build the financial logic that investors and lenders actually want to see. Every prompt is tested and runs in ChatGPT, Claude, and Gemini.
Stage 1
Before writing, you need a clear understanding of what the business actually is, who it serves, and how it makes money. These prompts help you nail this foundation.
Define the core business in one paragraph
I am starting a business that does the following: [DESCRIBE YOUR IDEA IN YOUR OWN WORDS]. Help me write a clear, jargon-free one-paragraph description of what this business does, who it serves, how it makes money, and what makes it different from existing alternatives. The goal is a description I could read to anyone — a potential investor, a potential customer, or my parents — and they would immediately understand it.
Define the target customer clearly
My business idea is: [DESCRIBE]. I think my customer is [DESCRIBE WHO YOU THINK THE CUSTOMER IS]. Help me define my target customer more specifically. What demographic and psychographic characteristics matter for this business? What specific problem am I solving for them, and how painful is that problem? What does the customer look like, and where do I find them?
Map the revenue model
My business is: [DESCRIBE]. I am considering these potential revenue models: [LIST MODELS YOU ARE CONSIDERING — SUBSCRIPTION, ONE-TIME PURCHASE, TRANSACTION FEE, ADVERTISING, FREEMIUM, ETC.]. Help me think through which revenue model best fits this business. What are the pros and cons of each? What are the unit economics implications? Which model is most likely to lead to sustainable margins at scale?
Identify the key assumptions behind the business
Here is my business model: [DESCRIBE IN DETAIL]. List the five to seven most important assumptions that have to be true for this business to work. For each assumption, describe: how confident I should be that it is true right now, what evidence would confirm or disprove it, and what happens to the business if this assumption turns out to be wrong.
Describe the competitive landscape
My business is in the [INDUSTRY/MARKET] space. Direct competitors include: [LIST]. Indirect competitors or alternatives customers use today: [LIST]. Help me write a competitive analysis that is honest and specific. What do competitors do well that I need to match? What is the genuine gap in the market I am filling? What is my defensible advantage, and how durable is it?
Stage 2
Each section of a business plan has a specific job. These prompts help you write each one efficiently without producing generic template filler.
Write the executive summary
Here is my business plan in rough form: [PASTE OR DESCRIBE MAIN POINTS]. Write a one-page executive summary that covers: what the business does (one sentence), the problem and solution, the target market size, the business model, the traction or validation I have so far, what I am asking for (if pitching investors), and the team. It should make a reader want to keep reading, not summarize every section.
Write the market opportunity section
My business targets [CUSTOMER TYPE] in the [MARKET/INDUSTRY]. Write the market opportunity section of my business plan. Include: total addressable market (TAM), serviceable addressable market (SAM), and serviceable obtainable market (SOM) — explain what each means and give me a logical way to estimate each for my specific business. I have the following market data: [PASTE ANY DATA YOU HAVE]. Help me frame it to show a compelling but credible opportunity.
Write the product or service description
My product or service is: [DESCRIBE IN DETAIL]. Write the product/service section of my business plan. It should explain: what the product is and does, the key features and benefits (from the customer's perspective, not the engineer's), what stage of development it is in, and what the roadmap looks like. Use plain language. Avoid buzzwords.
Write the go-to-market strategy
My business is [DESCRIBE] targeting [CUSTOMER]. I plan to acquire customers through: [DESCRIBE YOUR ACQUISITION STRATEGY]. Write the go-to-market strategy section. It should describe: my initial target segment and why I am starting there, the main customer acquisition channels and why they fit this business, the pricing strategy and how it connects to value, and the key milestones for the first year.
Write the operations section
My business is [DESCRIBE]. Key operational elements include: [DESCRIBE PRODUCTION, DELIVERY, KEY SUPPLIERS, TECHNOLOGY, TEAM]. Write the operations section of the business plan that describes how the business actually runs day-to-day. It should show that I have thought through the key operational dependencies and risks, not just the product idea.
Stage 3
The financial section is where most business plans fall apart. These prompts help you build honest projections and explain the numbers in a way that holds up under scrutiny.
Build a revenue projection framework
My business model is: [DESCRIBE]. My main revenue driver is [UNITS SOLD / SUBSCRIBERS / TRANSACTIONS / ETC.]. Help me build a simple three-year revenue projection framework. What are the key input variables I need to estimate? What assumptions about growth rate are realistic for this type of business? Walk me through the logic so I can build the projection in a spreadsheet.
Estimate startup costs
I am starting a [TYPE OF BUSINESS]. Help me build a comprehensive startup cost estimate. What categories of costs should I plan for (one-time setup costs, initial inventory or equipment, working capital, first-year operating costs)? For each category, list the specific line items I should include. I can then fill in my estimated amounts for each line.
Explain the unit economics
My business has the following unit economics: customer acquisition cost is approximately [CAC], average order value or monthly revenue per customer is [AOV/MRR], and my gross margin is approximately [%]. Help me write the unit economics section of my business plan. Explain what these numbers mean, how they relate to each other (LTV to CAC ratio), and what trajectory they need to follow to build a sustainable business.
Stress-test the financial projections
Here are my three-year financial projections: [PASTE KEY PROJECTIONS]. Help me stress-test them. What are the biggest levers that drive these numbers? What happens to the model if my key assumptions are wrong by 20%? What is the break-even point, and how long does it take to reach it under my base case and under a pessimistic scenario?
Write the funding ask section
I am seeking [AMOUNT] from [INVESTORS / BANK / GRANT PROGRAM]. The money will be used for: [DESCRIBE USE OF FUNDS]. Write the funding ask section of my business plan. It should clearly state the amount, what it will be used for in specific terms, what milestones this funding gets us to, and what the return or repayment looks like. Avoid vague language like "scale the business."
Stage 4
A business plan should survive scrutiny. These prompts help you find the weak spots, tighten the writing, and prepare for hard questions.
Find the weaknesses in the business plan
Here is my business plan (or key sections): [PASTE]. Play the role of a skeptical investor or lender who is looking for reasons to say no. What are the three to five biggest weaknesses you see? For each weakness, explain why it matters and what I could do to address it — either by strengthening the plan or by acknowledging it honestly with a mitigation strategy.
Prepare for investor questions
My business plan covers [DESCRIBE THE BUSINESS AND KEY CLAIMS]. I am preparing to present this to [TYPE OF INVESTOR/LENDER]. Generate the ten hardest questions they are likely to ask about my business plan. For each question, draft a concise, honest answer — not a defensive one. Include at least two questions that challenge my market size assumptions and two that challenge my competitive position.
Make the executive summary compelling
Here is my executive summary: [PASTE]. I want it to feel compelling and credible, not generic. Rewrite it with these changes: cut any filler language, make the market opportunity feel real with at least one specific data point, strengthen the statement of competitive advantage to be specific rather than vague, and end with a clear, confident ask.
Simplify complex sections for non-technical readers
Here is a section of my business plan that is too technical or dense: [PASTE SECTION]. My reader is [DESCRIBE AUDIENCE — INVESTOR / BANK LOAN OFFICER / GRANT COMMITTEE / GENERAL BUSINESS PARTNER]. Rewrite it for this audience. Remove or define any technical jargon. Lead each paragraph with the most important point. Cut anything that does not help the reader make a decision.
Create an appendix outline
My business plan has the following core sections: [LIST]. What supporting material should I include in the appendix? Suggest the documents, data, or exhibits that would strengthen credibility for my specific type of business and audience. Include: financial model assumptions, market data sources, team bios or credentials, and any customer validation data.
Claude can write every section of a business plan if you give it the raw inputs: your business concept, your target customer, your market research, and your financial assumptions. It is especially strong at the writing-heavy sections like the executive summary, market analysis, and product description. The financial projections require your own numbers.
It depends on the audience. For investors, 10-15 pages plus a financial model is typical. For a bank loan, 20-30 pages with full financials. For internal planning, the length matters less than the depth on the key questions: who the customer is, how you acquire them, and what the unit economics look like.
Early-stage investors typically want a pitch deck first. If they are interested, they will ask for a business plan or a more detailed memo. The discipline of writing a plan is valuable regardless — it forces you to think through the business rigorously. The plan is not just for the reader; it is for you.
Unrealistic financial projections and vague competitive positioning. Investors and lenders have seen hundreds of plans. The ones that get funded either show compelling traction or make an unusually rigorous case for a large market and a defensible position. Generic templates do neither.
At minimum: a three-year revenue projection with clearly stated assumptions, a startup cost estimate, a break-even analysis, and a twelve-month cash flow projection. If you are raising investment, also include a cap table and the projected return for investors.
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