How to write a business plan with ChatGPT, and what to check

ChatGPT can turn your notes into a business plan draft in an hour. That is real help. But the thinking, and the numbers, are still your job.

What a business plan is for

Before you open a chat, decide who the plan is for. A plan for a bank loan needs careful financials. A plan for yourself needs honest answers about whether the idea works. A plan for an investor needs a story about growth.

Tell ChatGPT which one it is. The same facts make a very different document for each reader.

Step 1: write a fact sheet first

ChatGPT fills gaps with guesses that sound confident. Close the gaps before you ask. Write one page of plain facts:

• What you sell, and the price.
• Who buys it, and why they buy it now.
• Your costs to start and to run each month.
• Who else sells something similar, and how you differ.
• How customers will find you.
• What the plan is for: a loan, an investor or your own decision.

This page is the most valuable part of the whole process. It is the same idea as a context file for AI: the model can only work with what you give it.

Step 2: build the plan section by section

Do not ask for the whole plan in one message. Paste your fact sheet, then ask for one section at a time. You will get more detail and catch mistakes sooner.

Here are the facts about my business. Use only these facts. If something is missing, ask me instead of guessing.

[paste your fact sheet]

Write the "Market and customers" section of a business plan for a bank loan. Keep it under 300 words. Mark any number that does not come from my facts with "CHECK".

Repeat for each section: summary, problem and solution, market, competitors, marketing and sales, operations, team, and financials. Write the summary last.

Step 3: check the numbers yourself

This is the step people skip. ChatGPT can produce market sizes, growth rates and statistics that look real and are not.

• Check every number against a source you can name.
• Build the financial forecast in a spreadsheet, not in the chat.
• Ask the model to list every assumption the plan depends on. Then test each one.

A plan with honest, smaller numbers is worth more than one with impressive numbers nobody can defend.

Step 4: make it sound like you

A lender or investor will meet you. If the plan sounds like a template, they will notice. Rewrite the summary in your own words, and cut the stock phrases.

There is more on this in how to make AI sound like you.

Use the plan after you write it

Most plans are written once and filed away. Keep yours alive. The fact sheet from step 1 is the start of a page you will use every week: your offer, your prices, your customers and your decisions. That page is the seed of a second brain for your business.

If you are deciding whether to start at all, how to run a one-person business with AI covers what AI can and cannot take off your plate.