How to Use AI to Write a Business Plan

Whether you’re applying for a start-up loan, talking to a bank or just trying to get your own thoughts straight, a business plan forces you to answer the awkward questions: who will buy this, why from you, and will the numbers ever add up? Many people put it off because the template looks like homework.

AI makes the process far less daunting. It can interview you about your idea, turn your answers into clear sections, suggest questions you haven’t thought about and help you set up a simple forecast. It can’t know your local market or your real costs, so the research and the numbers still come from you. Plan for two or three sessions of about an hour each.

What you’ll need

• A short description of your idea: what you sell, to whom and roughly where
• Whatever research you have: competitor names and prices, quotes from suppliers, any customer feedback
• Your best estimates of start-up costs, monthly running costs and prices
• An AI chatbot plus Google Sheets or Excel
• Two or three sessions of about an hour

Step-by-step: build your plan with AI

1. Start with the purpose. A plan for a bank loan needs more detail on finances and repayments; a plan for yourself can be shorter. Tell the AI who the plan is for.
2. Get interviewed. Ask the AI to question you one section at a time (prompt 1). The common sections are: executive summary, business description, target customers, market and competitors, marketing and sales, operations, management, financial forecast and risks.
3. Do the real research. Wherever the AI says “you’ll need to check”, go and check. Visit competitors’ websites, ask suppliers for quotes, look at local business directories and talk to potential customers. AI can suggest what to look for, but it doesn’t know current local prices or demand.
4. Draft each section. Paste your answers back and ask the AI to write each section in plain English (prompt 2). Keep the executive summary until last: it’s a one-page summary of everything else.
5. Build a simple forecast. Ask for a 12-month cash-flow layout with formulas (prompt 3), then fill it with your own figures. Be conservative with sales and generous with costs. Check every formula.
6. Pressure-test it. Ask the AI to play a sceptical bank manager or investor and list the ten hardest questions they’d ask (prompt 4). Strengthen the plan wherever the answer is weak.
7. Tidy and format. Use clear headings, short paragraphs and a few tables. Ten to fifteen pages is plenty for most small businesses; a one-page version is useful for conversations.

Copy-paste prompts

1. Interview me about my business idea

I'm writing a business plan for [BUSINESS IDEA] in [LOCATION]. The plan is for [A START-UP LOAN / MY OWN PLANNING / A PARTNER]. Interview me one section at a time: business description, target customers, competitors, marketing, operations, finances and risks. Ask two or three questions per section, wait for my answers, and tell me where I need to do more research before moving on.

2. Write a section from my answers

Here are my answers for the [SECTION NAME] section of my business plan: [PASTE ANSWERS]
Write this section in clear, plain UK English, about [NUMBER] words, with a short table if it helps. Use only the facts I've given. Where something is missing or an assumption looks optimistic, add a note in [BRACKETS] instead of filling the gap.

3. Create a 12-month cash-flow template

Create a 12-month cash-flow forecast layout for Google Sheets for a [TYPE OF BUSINESS]. Rows: opening balance, sales income (by product or service), other income, then costs ([LIST YOUR MAIN COSTS]), total costs, net cash flow and closing balance. Give me the exact formulas with cell references, and explain how to enter seasonal sales.

4. Challenge my plan like a lender

Act as an experienced, sceptical small-business lender reading this plan: [PASTE PLAN OR SUMMARY]
List the 10 toughest questions you would ask, ranked by importance. For each, say what a convincing answer would need to include. Be direct but fair.

Recommended tools

• ChatGPT: good for interviewing you section by section and drafting from your notes.
• Claude: handles long documents well, so it can review your whole plan for gaps and consistency.
• Gemini in Google Sheets: help with forecast formulas inside your spreadsheet.
• Microsoft Copilot in Excel and Word: the same for Microsoft users.
• Grok: quick for brainstorming risks and competitor angles.
• Government business support: free templates and local advice services are available in many countries.

Tips and mistakes to avoid

• Don’t use AI market figures without checking. Chatbots can produce confident but out-of-date or made-up statistics. Use official sources or your own research and note where each figure came from.
• Keep the numbers yours. The AI can build the spreadsheet, but every price, cost and sales estimate should come from quotes, research or honest guesses you can explain.
• Be specific about customers. “Everyone” is not a target market. “Busy parents within five miles who want healthy takeaway meals” is.
• Include the boring risks. Illness, a key supplier letting you down, a slow first winter. Lenders like to see you’ve thought about them.
• Protect confidential details. You don’t need to paste supplier contracts or personal finances into a chatbot. Summaries are enough.
• Update it. Revisit the plan every few months and compare forecasts with what actually happened.

FAQ

Can AI write my whole business plan?

It can produce a draft that looks complete, but a plan built on invented assumptions is worse than useless. Use AI to structure, question and polish, and supply the research and figures yourself.

How long should a small business plan be?

Long enough to answer the key questions clearly. For most small businesses that’s 10–15 pages plus a forecast. A loan application may ask for a specific template, so check first.

Do I need a business plan if I’m not borrowing money?

It’s not required, but writing one helps you test whether the idea works before you spend savings on it. A short, one-page version is a good middle ground.

I'm writing a business plan for [BUSINESS IDEA] in [LOCATION]. The plan is for [A START-UP LOAN / MY OWN PLANNING / A PARTNER]. Interview me one section at a time: business description, target customers, competitors, marketing, operations, finances and risks. Ask two or three questions per section, wait for my answers, and tell me where I need to do more research before moving on.

Related guides

• How to use AI to make a monthly budget
• How small businesses can use AI to answer customer emails
• How to use AI to write product descriptions that sell

Reference: GOV.UK: Write a business plan