How to write a business plan with AI

By the end of this, you will have a first draft of a complete business plan, built section by section with AI as a thinking partner rather than a machine that spits out a generic template.

What you will need

• Any AI chat tool: Claude, ChatGPT, or Gemini all work well.
• A rough idea of your business: what you sell, who you sell to, and why.
• About 30 to 45 minutes, and somewhere to save the draft as you go.

Step 1: Give the AI the full picture

Start by telling the AI everything you know about your idea, even the messy, half-formed parts. The more context you give it up front, the more your plan will sound like your business and not a stock example.

I'm planning a business and want your help drafting a business plan. Here's
what I know so far:

- What it is: [describe your product or service]
- Who it's for: [your customers]
- Why people would choose it: [what makes it worth paying for]
- Where I am now: [an idea, a side project, already trading, etc.]

Please don't write anything yet. First, ask me any questions that would help
you understand the business better.

What to expect: the AI will ask you a handful of questions, often about pricing, competitors, or how you will reach customers. Answering them is the most valuable part of the whole exercise.

If it does not work: if it starts writing the plan straight away, reply with “Please hold off on writing and ask me your questions first.”

Step 2: Agree on the structure

Before writing any content, settle on the shape of the plan. This keeps the whole thing organised and gives you a checklist to work through.

Based on what I've told you, suggest a section-by-section outline for my
business plan. Keep it practical for a small business, and add a one-line
note under each section explaining what it should cover.

What to expect: a clear list of sections, usually something like an overview, the market, your offering, how you will make money, and next steps. Read it and add or remove sections until it fits your business.

If it does not work: if the outline feels too corporate or long, say “Trim this to the six sections that matter most for a business at my stage.”

Step 3: Draft one section at a time

Now work through the outline in order, one section per message. Tackling it in small pieces keeps each part focused and stops the AI from losing track of the detail.

Let's draft the "market and customers" section. Write it in plain, confident
English, in the first person, and about 200 words. Base it only on what I've
told you. If you need a detail I haven't given, leave a clearly marked gap like
[NEED: rough market size] rather than guessing.

What to expect: a tidy draft of that one section, with any missing facts flagged instead of invented. Fill the gaps yourself, then move on to the next section with the same kind of prompt.

If it does not work: if a draft reads as vague or padded, reply with “This feels generic. Make it specific to my business using only the details I’ve given.”

Step 4: Stress-test your thinking

A good plan survives a few hard questions. Ask the AI to challenge you before you consider the draft finished.

Act as a cautious potential investor reading this plan. Give me the five
toughest questions you'd ask, and point out any claims that sound optimistic
or unsupported.

What to expect: a list of pointed questions and a few weak spots worth strengthening. Some may not apply, and that is fine. Work the useful ones back into the relevant sections.

Wrapping up

You now have a full first draft, written in your voice and pressure-tested for weak points. Read it through end to end, since AI can occasionally state something with confidence that is not quite right, so check every figure and claim against what you actually know. From here you can ask the AI to tighten the language, produce a one-page summary, or turn the plan into slides for a meeting.

A note on long plans: an AI tool can only hold so much text at once, a limit called the context window. If your plan grows long and the AI starts forgetting earlier sections, paste the relevant section back in before asking it to edit that part.