How to Use AI to Write a Business Plan (6 Steps + Prompts)

You have the idea. Maybe you have the first clients. What you don’t have is the document a bank, a partner or your own sceptical brain keeps asking for. You open a blank page, type “Executive Summary”, and stare at it for twenty minutes.

Here’s the short answer. To use AI to write a business plan, don’t ask it to “write a business plan for my coffee shop”. Give it a short brief with the facts only you know (who pays you, what for, what it costs you, what you need), let it interview you about the gaps, then have it draft one section at a time in a format you picked: a one-page lean plan or a full traditional plan. You do the numbers yourself, and you finish by asking the AI to attack the plan like a lender would. ChatGPT, Claude or Gemini can get you to a solid first draft in an afternoon. The thinking stays yours. The typing gets a lot lighter.

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What AI is good at in a business plan (and where it will fool you)

AI is very good at three jobs here: turning your messy notes into clear sections, asking the questions you forgot, and spotting where your story doesn’t hang together. That is most of the pain of writing a plan.

It is bad at one thing that matters a lot: facts about your market. OpenAI says it plainly in its own help article “Does ChatGPT tell the truth?”: the model can produce incorrect facts and even fabricated studies or citations, and it can sound confident while doing it. Their advice is to use it as a first draft, not a final source, and to check data and references yourself.

So a market size figure that shows up in your draft without a link you clicked yourself doesn’t go in the plan. Treat every number the AI offers as a question (“where would I check this?”), never as an answer.

There’s a second trap. Harvard professor William Sahlman wrote in Harvard Business Review that detailed financial projections for a new company are an act of imagination, and that most business plans spend far too much ink on the numbers. AI makes that worse if you let it, because it can produce five years of tidy spreadsheets in seconds. Tidy is not the same as true. Spend your effort on who the customer is, why they buy and what could go wrong.

Step 1: Pick your format before you prompt

The U.S. Small Business Administration describes two common formats in its guide “Write your business plan”:

• Lean startup plan. Usually one page, built from a handful of blocks: key partnerships, key activities, key resources, value proposition, customer relationships, customer segments, channels, cost structure and revenue streams. The SBA says it can take as little as an hour.
• Traditional plan. Detailed and often dozens of pages: executive summary, company description, market analysis, organization and management, service or product line, marketing and sales, funding request and financial projections. The SBA notes lenders and investors commonly ask for this one.

Rule of thumb: if you’re asking a bank or investor for money, write the traditional plan. If the plan is for you and a partner to get clear on the business, start lean. You can always grow the lean version into the full one later, and AI is great at that expansion step.

Telling the AI which format you want is the single biggest upgrade to your prompt. Without it you get a generic mix of both.

Step 2: Write a 10-minute founder brief

This is the part nobody can do for you, and it is why AI drafts usually sound empty. The model knows what a business plan looks like. It doesn’t know your business. Open a note and answer these in plain sentences. Bullet fragments are fine.

The last line matters more than it looks. A plan for a bank loan officer and a plan for a co-founder are different documents, and the AI can only write for the reader you name.

Step 3: Let the AI interview you first

Paste your brief and ask for questions, not a draft. This is where AI saves you the most time, because it is good at noticing what is missing.

Answer honestly, including “I don’t know yet”. Those “don’t know” answers become your to-do list. Some of them, like how big your local market is or what competitors charge, need real research. Our guide on how to use AI for market research shows how to do that with sources you can check, and the SBA’s guide lists free public data such as the Census Business Builder.

Step 4: Draft one section at a time

Asking for the whole plan in one go gives you a long, smooth, shallow document. Section by section gives you something you can actually defend. Start with the middle (market, customers, offer) and leave the executive summary for last, because it summarizes everything else.

Then repeat for each section you need. The [NEEDS DATA] tags are the trick. They stop the model from filling holes with plausible fiction, and they show you exactly what to look up.

A quick tool note. ChatGPT, Claude and Gemini all handle this well. Claude is pleasant for long documents if you paste the whole draft back in later, and it is what we use in how to use Claude for work. Pick the one you already pay for. The brief matters far more than the brand.

Step 5: Do the numbers yourself, with AI as a checker

This is where most AI business plans go wrong. Don’t ask the model to “create financial projections”. Give it your numbers and ask it to lay them out and check the math.

The SBA’s guide includes a simple break-even formula every plan should show: fixed costs divided by (price per unit minus variable cost per unit) gives your break-even point in units. Here is a made-up example to show the idea. Say your fixed costs are 3,000 a month, you sell a service at 500, and each sale costs you 100 to deliver. 3,000 divided by 400 is 7.5, so you need 8 sales a month before you make a cent.

Then check the math in a spreadsheet. Chatbots still slip on arithmetic now and then, and a lender will check. If you’d rather work from a sheet you already have, our guide to analyzing a spreadsheet with ChatGPT walks through uploading it and asking good questions.

Honest projections with your reasons written next to them beat confident five-year curves. That’s Sahlman’s point too: readers care about the people, the opportunity and the risks you see, not about how many cells you filled.

Step 6: Ask the AI to attack your plan

Once the draft is done, switch roles. This is the step that turns an AI draft into a plan you trust.

You will not like every answer. Good. It is much cheaper to hear it from a chatbot at your kitchen table than from a loan officer across the desk.

Want a second angle on the same plan? Run a quick SWOT analysis with AI on your business before you send it out. It shows where your strengths line up with real opportunities, and which threats your plan still has no answer for.

A worked example: a freelance bookkeeper’s lean plan

To make this concrete, here is an illustrative example (not a real client). Sam is a freelance bookkeeper who wants to stop taking every job and focus on small hair and beauty salons.

Her prompt without a brief: “Write a business plan for a bookkeeping business.” The result: a generic page about “offering high-quality financial services to businesses of all sizes”, a competitor section with no names, and growth figures nobody can check.

Her prompt with a brief: She told the AI she has six salon clients, charges a fixed monthly fee, gets most new clients through referrals from one supplier, and has room for about ten more clients on her own. She asked for a lean plan for herself and a possible part-time hire.

The draft came back with a clear value proposition (bookkeeping that understands booth rental and tips), a customer segment narrow enough to market to, and three [NEEDS DATA] tags: how many salons are within her area, what other bookkeepers charge them, and how many referrals the supplier sent last year. The attack step then pointed out that the whole plan leans on one referral source. That became the first risk in her plan, with a fix: test a second channel before hiring.

Same tools, same afternoon. The difference was the brief.

Free AI business plan generators vs a normal chatbot

If you search for an AI business plan generator, you’ll find many tools, free and paid. Some are useful, especially ones that give you a good template and a finance sheet that adds up. Under the hood, most of them do what you just did: ask you questions and fill sections.

So the honest test for any tool is simple. Does it ask you for your real facts before writing? Does it let you edit every section? Does it show you where its numbers come from? If yes, use whatever you like. If it writes ten pages from one sentence about your idea, you are back to a generic plan with a nicer cover.

A general chatbot plus the prompts on this page gets you the same result without a new subscription. If you’ve built a plan before, you’ll notice the work looks a lot like using AI to create a project plan: brief first, structure second, your judgement last.

What not to paste into a chatbot

A business plan holds sensitive things: client names, bank details, your salary, a partner’s personal finances. Before you paste, check your settings. OpenAI’s data controls page explains that on personal ChatGPT plans, data sharing for model training is on by default and can be turned off under Settings, Data controls, “Improve the model for everyone”. It also says business and enterprise workspaces aren’t used for training by default.

Simple habit: replace client names with “Client A”, round personal figures, and leave out account numbers completely. The AI doesn’t need them to write a good plan.

Applying for funding instead of a loan or investor? The same facts-first method works for grants too. Here is how to use AI to write a grant proposal section by section, including what funders say about AI.

Common mistakes

• No brief. One sentence in, ten generic pages out.
• Letting AI invent the market. Every number needs a source you opened yourself.
• Writing the executive summary first. Write it last, from the finished sections.
• Five-year projections with no reasons. Twelve honest months with your assumptions written down are more convincing.
• Skipping the attack step. The weak points are still there. You just find out later.
• Sending the AI’s wording as is. Read it out loud. If it doesn’t sound like you, a reader who meets you will notice.

FAQ

Can AI write a business plan for me?

It can write the draft, and it can save you hours of typing and structuring. It can’t know your customers, your costs or your goals unless you tell it, and it can get facts wrong. Think of it as a fast co-writer who needs a good brief and a careful editor.

What is the best AI to use to write a business plan?

ChatGPT, Claude and Gemini all do this well. Use the one you already know. A clear brief, a chosen format and the section-by-section method matter far more than which model you pick.

Can I use an AI-written business plan for a bank loan?

Yes, as long as everything in it is true and you can explain every number. The lender reads the plan, not the tool you used. Check the figures yourself, add real sources, and make sure you could answer the questions from Step 6 in a meeting.

How long does it take?

The SBA says a lean plan can take as little as an hour. With AI doing the drafting, a lean plan is realistic in one sitting. A traditional plan usually takes a few sessions, mostly because of the research and the numbers, which is time well spent.

What should a business plan include?

For a traditional plan, the SBA lists executive summary, company description, market analysis, organization and management, service or product line, marketing and sales, funding request and financial projections. Use only the sections your reader needs.

Stuck choosing between two business ideas, markets or pricing models before you write the plan? Make a decision matrix with AI first, so the plan starts from a choice you can defend.

Your next step

Open a note now and fill in the founder brief from Step 2. Ten minutes. Then paste it into the chatbot you already use with the interview prompt from Step 3. By tonight you’ll have a list of honest questions about your business, and that list is worth more than any polished template.

If you want more workflows like this, built for people who use a computer all day and want AI to take the boring parts, start on our home page or grab the free Launchpad right here.

Writing client proposals as well as plans? See AI proposal writing software for how to pick the right stack for your deals.

Still testing an idea before you write the plan? Here is how to use ChatGPT to make money and get your first paying customer.