How to Write a Business Plan With ChatGPT, Claude or Gemini

To write a business plan with ChatGPT, Claude or Gemini, give the AI your own facts first (what you sell, to whom, at what price, what it costs you), then have it draft one section at a time, question your assumptions and tighten your wording. Don’t let it supply market numbers, sources or financial projections on its own: those are where AI makes things up. You stay the author. The AI is a fast first-draft writer and a tough practice reviewer, and every number in the final plan should come from you or a source you have opened yourself.

This guide covers what an AI business plan assistant does well, where it goes wrong, and a section-by-section workflow with ten prompts. It works the same in any chat tool.

What AI is good at in a business plan

AI chat tools save the most time on the parts of a plan that are about words and structure:

Structure. It can lay out the standard sections in a sensible order and adapt them to your purpose, such as a bank loan, an investor pitch or your own planning.
First drafts. Turning your rough notes into readable paragraphs is the step most people get stuck on. A draft you can edit beats a blank page.
Rewording. It can shorten a rambling section, cut jargon, or rewrite for a reader who doesn’t know your industry.
Questioning your assumptions. Asked to play a skeptical loan officer or investor, it will find gaps you didn’t notice: no plan for slow months, no answer to “why you and not the shop down the street?”
Formulas and checklists. It can explain how to build a break-even calculation or a cash flow table, so you can do the math yourself in a spreadsheet.

Where ChatGPT and Claude get business plans wrong

The same tools fail in predictable ways. If you know them in advance, you can catch them.

Made-up market numbers. Ask “how big is the dog grooming market in Ohio?” and you may get a confident figure with no real source behind it. It can look exactly like a real statistic.
Made-up or wrong sources. AI can name a report, a survey or an agency page that doesn’t exist, or that doesn’t say what it claims. If your tool searches the web and shows links, open each one and find the number on the page.
Generic copy. “We are passionate about delivering exceptional quality and outstanding customer service” could describe any business. Readers skim past it, and it tells them you haven’t thought about what makes you different.
Unrealistic projections. AI tends to produce smooth, optimistic growth curves. It doesn’t know how many customers you can physically serve in a day, how long it takes to get your first ones, or what your supplier actually charges.
Outdated program details. Government loan and grant programs change, and an AI’s training data has a cutoff. For example, the Canada Small Business Financing Program added new loan classes, a line of credit and higher loan amounts in 2022. A tool working from older material can describe the old rules with complete confidence. Always check program details on the official page and with the lender.

Before you start: build a fact sheet

The quality of an AI draft depends almost entirely on what you give it. Spend an hour on a plain fact sheet before you open the chat. Write short answers to these:

What you sell, in one sentence, and your prices.
Who buys it: a specific type of customer in a specific place.
Why they would choose you over the alternatives you know about (name the competitors).
Where you will operate, and your hours or capacity.
Your relevant experience and anyone else on the team.
What it costs to start (equipment, deposits, licenses, first inventory). See estimating startup costs for a worksheet.
Your monthly running costs (rent, insurance, wages, software, vehicle).
How much money you need, where it will come from, and what it’s for.
What you know about demand: pre-orders, a waiting list, quotes from customers, local data.
The purpose of the plan and who will read it.

Mark anything you’re unsure of as “estimate” or “unknown”.

What not to paste in. Leave out personal identifiers such as your Social Insurance Number or Social Security Number, account numbers, and anything confidential from an employer or partner. Check your tool’s privacy or data settings for whether your chats can be used to train its models. Anthropic, for example, explains its setting for Claude in its privacy center.

How to write a business plan with ChatGPT, step by step

Work in one conversation per plan, so the AI keeps your fact sheet in view. Go one section at a time and edit each draft before moving on. The ten prompts below follow the usual section order. Replace the parts in square brackets.

The sections themselves are standard. The U.S. Small Business Administration lists the usual parts of a traditional plan: executive summary, company description, market analysis, organization and management, service or product line, marketing and sales, funding request and financial projections. Our step-by-step business plan guide explains what goes into each one.

Step 1: Load your facts and let the AI interview you

Paste your fact sheet with this prompt. The interview fills gaps before any drafting starts.

I'm writing a business plan for [business, one sentence] in [city, region].
The plan is for [a bank loan / an investor / my own planning], and the
reader is [a loan officer / an angel investor / me and my partner].

Here is my fact sheet:
[paste fact sheet]

Don't write anything yet. Ask me up to 10 questions, one at a time, about
the gaps a [loan officer / investor] would notice. Wait for each answer
before asking the next. Never fill in a fact or number I haven't given you.

Step 2: Get an outline fitted to your reader

Using my answers, propose an outline for the plan with these sections:
executive summary, company description, products and services, market
analysis, competition, marketing and sales, operations, management,
funding request, financial projections. For each section, list the 3-5
points it must cover for my reader, and mark each point "have it" or
"missing" based on what I've told you.

The “missing” points are your to-do list. Don’t let the AI draft them until you have the facts.

Step 3: Draft the company description and products

Draft the company description and the products and services sections,
about 300 words in total. Use only facts from this conversation. Write
in plain, specific language for a [loan officer]. No phrases like
"passionate", "cutting-edge", "world-class" or "exceptional service".
Where a fact is missing, write [NEED: what's missing] instead of guessing.

The [NEED: …] markers stop the AI from quietly inventing details and show you what to fill in.

Step 4: Plan the market analysis, then do the research yourself

This is where AI does the most damage if you let it supply numbers. Ask it for a method instead.

Help me plan the market analysis for [business] in [area]. Don't give me
any market size figures. Instead:
1. List the specific numbers I need (e.g., number of target households,
   number of competitors, typical spend).
2. For each one, suggest the kind of official or primary source that could
   provide it, and how I could estimate it myself if no source exists.
3. Show the bottom-up formula that turns those numbers into a first-year
   sales estimate.

Then find the numbers yourself. Good free starting points are government statistics. In the U.S., the Census Bureau’s County Business Patterns gives the number of establishments with paid employees by industry, county and employment size. In Canada, Canadian Industry Statistics from Innovation, Science and Economic Development Canada lets you look up an industry by name or NAICS code and see business counts by province, from Statistics Canada data. Add your own evidence: competitor price lists, a count of competitors on a map, customer interviews. Our guide to market analysis for a business plan walks through the full method.

Step 5: Map the competition

Here are the competitors I know about, with what I've found on their
websites and in person: [list names, prices, services, hours, reviews].
Build a comparison table: competitor, price, what they do well, where
they're weak, and how my business is different. Use only what I've given
you. Then tell me which of my claimed differences a customer would
actually care about, and which are weak.

Step 6: Draft marketing and sales

Draft the marketing and sales section. My budget is [$X per month] and my
main channels will be [list]. For each channel, state the action, the
monthly cost and how I'll measure whether it works. Tie the plan to the
customer I described. Keep it under 350 words and mark any guess as
[ASSUMPTION].

Step 7: Check the financial assumptions, not just the totals

Build your projections in a spreadsheet you control, then paste in the key assumptions for a review. Don’t ask the AI to “create financial projections” from nothing: it will hand you tidy numbers with no basis. See financial projections for a business plan for how to set up the spreadsheet.

Here are the assumptions behind my first-year projections:
[price, customers or units per day, days open, cost per sale, monthly
fixed costs, owner's pay, loan payment, startup costs].

Check them like a skeptical lender. For each one: is it realistic for a
new business in my situation, what would make it wrong, and what evidence
would make it believable? Then recalculate monthly break-even from my
numbers and show every step of the math.

Re-check any arithmetic the AI shows you in your spreadsheet. Chat tools can make simple calculation errors.

Example (made up): a mobile dog groomer called Tidy Paws asks an AI for first-year revenue. The draft assumes 8 grooms a day at $95, 5 days a week, 48 weeks a year. But each groom takes about 90 minutes plus 30 minutes of driving, so an 8-hour day fits 4 grooms at most. A new business won’t fill every slot in year one, so the owner also tests 80% of capacity.

Version	Grooms per day	Price	Days per year	Revenue
AI draft	8	$95	240	$182,400
Full capacity	4	$95	240	$91,200
80% of capacity	3.2	$95	240	$72,960

The AI’s figure is two and a half times the realistic one. A lender who asks “how long does a groom take?” would find that in a minute.

Step 8: Stress-test the whole plan

Once every section has a draft, paste in the full plan and ask for an honest review.

Act as a [commercial loan officer at a bank / angel investor] reviewing
this business plan. Be blunt. List:
1. The 5 questions you'd ask me in a meeting.
2. Every claim that has no evidence behind it.
3. Any numbers that don't match between sections.
4. The biggest risk to repayment [or to a return], and whether the plan
   addresses it.
Don't rewrite the plan. Just give me the review.

Answer each point in the plan itself, with facts. Our SWOT analysis guide is a useful way to organize the risks it raises.

Step 9: Write the executive summary last

Our guide to the business plan executive summary shows what a finished one looks like.

Write a one-page executive summary of the final plan below for a
[loan officer]. Cover: what the business is, who the customer is, why it
will win, how much money I need and what it's for, how it will be repaid
[or what the investor gets], and the key first-year numbers. Use only
figures that appear in the plan, exactly as written.

[paste final plan]

Compare every figure in the summary with the plan. A summary that says $91,200 while the projections say $72,960 is a common slip.

Step 10: Edit out the AI voice

Edit this section so it sounds like me, an owner explaining my business
to someone across a desk. Shorter sentences. Remove filler, buzzwords and
any sentence that could describe a different business. Keep every fact
and number unchanged. Show me what you cut.

Then read the plan out loud and rewrite anything you wouldn’t say in a meeting.

How to fact-check an AI business plan

Before anyone else reads your plan, go through it with this checklist:

Every number has a home. Each figure is either your own (a quote, your price list, your count) or comes from a source you opened and found the number on. Write the source down, even if it doesn’t go in the plan.
Every source exists. Open each link or title. If you can’t find the document, or it doesn’t contain the number, delete the claim.
Program and tax details come from the official page. Loan programs, grants, licensing rules and tax rates go to the government or lender page, not the AI’s summary. If you’re applying for a Canada Small Business Financing Program loan, see our CSBFP business plan guide and confirm the current terms with your lender. For a U.S. loan backed by the Small Business Administration, start from the SBA’s own loans page.
The math adds up. Recalculate totals, break-even and loan payments in your spreadsheet. Make sure the same number is the same everywhere it appears.
Capacity is physically possible. Customers per day, hours worked and staff count fit together, as in the Tidy Paws example.
No generic sentences. Search the text for words like “passionate”, “innovative”, “leverage”, “seamless” and “cutting-edge”. Replace each with a specific fact or delete it.
You can explain every line. If someone asked “where did this come from?”, you’d have an answer.

What lenders and investors notice

A plan tests whether you understand your business, so the reader judges you as much as the document. These stand out when AI has done too much of the work:

Numbers with no visible basis. A market size or growth rate with no source, or a sales forecast with no customers-times-price logic behind it.
Sections that don’t agree. Different startup costs in the funding request and the financials, or a staff count that doesn’t match the wage line.
Copy that could be about anyone. Vague promises instead of your actual location, prices, suppliers and first customers.
An owner who can’t explain the plan. In a meeting, you’ll be asked about your assumptions. If the answers are in the plan but not in your head, that shows quickly.

What reads well is the opposite: specific local facts, honest risks with a plan for each, and numbers that tie back to things you can show. For any lending, legal or tax decision, check with the lender or a professional.

Is it OK to use AI to write a business plan?

Yes, as long as you use it as a writing and thinking aid and the plan is accurate. A business plan is judged on whether its facts are true and its numbers hold up, and on whether you understand them, not on who typed the first draft. The risk is submitting something you haven’t checked. If an AI-invented statistic or an outdated loan rule ends up in front of a lender, it’s your credibility on the line.