Quick answer: to write a business plan with AI, gather your own facts first, let ChatGPT, Claude or Gemini interview you, draft one section at a time, build the financials in a spreadsheet, and ask the AI to criticise the finished plan.
A business plan used to mean a weekend with a blank document and a template you half understood. AI assistants such as ChatGPT, Claude and Gemini have changed that. Used well, they can turn your ideas into a clear, well-structured plan in a few hours – asking you the right questions, organising your thinking and drafting each section.
Used badly, they produce a generic plan full of confident-sounding numbers that have nothing to do with your business. This guide shows you how to write a business plan with AI the right way: you supply the facts and judgement, the AI does the structuring and drafting.
Table of Contents
What AI can and cannot do for your business plan
| AI is good at | You still need to do |
|---|---|
| Structuring the plan into clear sections | Decide what the business actually is and who it serves |
| Asking questions that expose gaps in your thinking | Answer those questions honestly |
| Drafting readable text from rough notes | Check every claim and number |
| Suggesting research areas and competitor types | Do the real research and speak to customers |
| Building a forecast layout and formulas | Supply realistic prices, costs and sales volumes |
| Rewriting for a bank, investor or grant audience | Make sure the plan reflects reality |
The golden rule: never let AI invent your numbers or your market data. AI tools can state figures that sound plausible but are wrong. Use them to organise and explain, not as a source of facts.
Before you start: gather your raw material
AI works best with specific input. Spend 30 minutes jotting down, in any order:
- What you sell, and at what price
- Who buys it and why they need it
- Where and how you will sell (shop, online, trade, contracts)
- Who else sells something similar nearby or online
- What it costs you to make or deliver
- Start-up costs: equipment, stock, website, deposits
- Your own experience and any team
- What you want the plan for: a bank loan, an investor, a grant, or your own clarity
Rough bullet points are fine. The point is that the facts come from you.
Step 1: Let the AI interview you
Instead of asking for a plan immediately, ask the assistant to question you first. This single step dramatically improves the result.
Prompt: “I want to write a business plan for [idea] in [town/region]. Act as an experienced business adviser. Ask me questions one at a time to understand the business, the customers, the competition and the finances. After about 15 questions, summarise what you have learned and point out any gaps or risks.”
Answer as honestly as you can. If you do not know something, say so – the gaps it identifies become your research list.
Step 2: Agree the structure
Most UK business plans, including those requested by banks and start-up loan schemes, follow a similar structure:
- Executive summary
- Business description and owners
- Products or services
- Market research and target customers
- Competitor analysis
- Marketing and sales plan
- Operations: premises, suppliers, equipment, staff
- Financial plan: start-up costs, pricing, sales forecast, cash flow, break-even
- Risks and how you will manage them
Prompt: “Based on our conversation, create an outline for my business plan using these sections. Under each heading, list the specific points I should cover for my business.” If a lender or grant body has its own template, paste its headings in instead.
Step 3: Draft each section separately
Do not ask for the whole plan in one go. You will get shallow, generic text. Work section by section, giving the AI your notes each time.
Business description
Prompt: “Write the business description section using these notes: [notes]. Keep it under 300 words, factual and plain English. Do not add any claims I have not given you.”
Target customers
Prompt: “Help me describe my target customers. Here is what I know: [notes]. Suggest two or three customer profiles, and list what I should check to confirm each one is real.”
Competitor analysis
List real competitors you have found yourself, with their prices and what customers say about them. Then: “Turn this competitor information into a comparison table and a short analysis of where my business can stand out: [details].” Research tools such as Perplexity can help you find competitors, but always visit their websites to confirm – see our guide to using Perplexity for research.
Marketing plan
Prompt: “Suggest a realistic first-year marketing plan for [business] with a budget of [amount]. Break it down by month and channel, and say how I would measure whether each activity works.”
Operations
Prompt: “Write the operations section from these notes: [premises, suppliers, opening hours, equipment, staff]. Highlight anything that could stop the business operating and what the backup would be.”
Step 4: Build the financials – carefully
This is where AI is most useful and most dangerous. It is excellent at building the structure of a forecast and explaining concepts; it has no idea what your sales will be.
- Start-up costs. Give the AI your list of costs and ask it to organise them into a table with a total, and to suggest common costs you may have forgotten (insurance, licences, accountancy, website hosting).
- Sales forecast. Decide your own assumptions – price, customers per week, seasonality – then ask the AI to lay them out month by month for 12 months in a table you can paste into a spreadsheet.
- Cash flow. Ask for a simple cash flow template with columns for each month and rows for money in and money out, and an explanation of how to fill it in.
- Break-even. Ask it to calculate your break-even point from your fixed costs, price and cost per sale, and to show the working.
Then check the maths in a spreadsheet yourself. AI chatbots can make arithmetic mistakes, especially across long tables. Most lenders will expect a spreadsheet anyway.
Step 5: Write the executive summary last
The executive summary is the most-read page, and it is easier to write once everything else exists.
Prompt: “Here is my complete business plan: [paste]. Write a one-page executive summary for [a bank manager / an investor / a grant panel]. Include what the business does, the opportunity, how much funding is needed and what it will be used for, and the key financial figures. Use only information from the plan.”
Step 6: Ask the AI to criticise it
Once the plan is drafted, switch the AI into critic mode. This is one of its most valuable uses.
Prompt: “Act as a sceptical bank lending manager. Review this business plan and list the ten biggest weaknesses, unanswered questions or unrealistic assumptions. Be blunt.” Fix what you can, and address the rest honestly in the risks section.
Step 7: Tailor the plan to its reader
The same business can need very different plans. A bank wants to know it will be repaid, so it focuses on cash flow, security and your track record. An investor wants growth and a route to a return. A grant panel wants to see that you meet its criteria and will deliver the outcomes it funds. And a plan written only for yourself can be shorter and more practical.
Prompt: “Rewrite this plan for [audience]. Tell me which sections they will care about most, what they are likely to ask, and what I should add or cut.” Keep a master version and create tailored copies, rather than overwriting the original each time.
Which AI tool is best for business plans?
- Claude handles long documents well and writes in a natural tone, which helps when reviewing a full plan. See how small businesses use Claude.
- ChatGPT is strong for brainstorming and structured tables. See how small businesses use ChatGPT.
- Gemini is convenient if you write in Google Docs and Sheets, and its Deep Research feature helps with early market research.
Free versions are enough for most plans. Paid plans help if you are uploading long documents repeatedly. Our 50 ChatGPT prompts for small business owners include more planning prompts.
Common mistakes to avoid
- Copying AI market statistics. Find figures from reliable sources and cite them.
- Accepting generic text. If a sentence could describe any business, rewrite it with your specifics.
- Over-optimistic forecasts. Ask the AI for a pessimistic scenario as well as your expected one.
- Forgetting your own voice. Lenders meet you, not the AI. Make sure you can explain every part of the plan in your own words.
- Pasting sensitive information carelessly. Think before uploading personal financial details or other people’s data.
The UK government’s guide to writing a business plan includes free templates you can use alongside these prompts. Combining an official template with a business plan with AI drafting is one of the quickest ways to get a lender-ready document.
Business plan with AI: frequently asked questions
Can ChatGPT write a business plan for me?
It can draft one, but the plan is only as good as the information you give it. Use AI to structure and write, and supply the facts, prices and forecasts yourself.
Will a bank accept a business plan written with AI?
Banks judge the content, not how it was typed. A plan based on real research and realistic numbers, which you can explain confidently, is what matters.
How long does it take to write a business plan with AI?
With your notes prepared, a solid first draft can take an afternoon. Allow more time for research and for checking the financials.
Is it safe to put my business idea into ChatGPT?
Check the data settings of the tool you use. Most allow you to turn off training on your conversations, and business plans offer stronger data terms.
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