How to Write a Business Plan: A 6-Week Roadmap, Section by Section
8 min read ยท 2026-10-12
How to write a business plan: decide who will read it, research your market and customers, and describe your offer and how you will run the business. Then plan how you will sell, build your financial projections and write the executive summary last. If you work on one block per week, a first plan you can send to a bank, an investor or a partner takes about six weeks part time.
This roadmap gives each week one job, a few concrete tasks and a milestone you can check. At the end of each week you have a finished piece of the plan, not a blank document and a vague to-do list.
The roadmap at a glance
Goal: A complete business plan, reviewed by at least two people, ready to send to its first reader. Duration: 6 weeks, part time
Purpose and Setup (Week 1)
Decide what the plan is for, so every section answers the right question.
- Write one sentence that says who will read the plan and what you want from them: a loan, an investment, a partner or your own clarity.
- Choose the format: a lean one-page plan for yourself, or a traditional plan for a lender or investor.
- Create the document with all section headings, even empty ones.
- List what you already know and what you still need to find out, section by section.
Milestone: A document with every heading in place and a written list of open questions.
Market and Customer Research (Week 2)
Prove that people want what you plan to sell, and find out who those people are.
- Describe your target customer in a few lines: who they are, what problem they have, how they solve it today.
- Talk to at least five potential customers and write down their exact words.
- List your direct competitors and the alternatives people use instead, with their prices and offers.
- Collect market data from public sources such as government statistics, industry associations or trade reports, and note each source.
Milestone: A finished market analysis section with every figure sourced and quotes from real conversations.
Offer, Operations and Team (Week 3)
Explain what you sell, how you will deliver it and who will do the work.
- Describe your product or service, its price and why a customer would pick it over the alternatives.
- Write how the business runs day to day: suppliers, location, tools, legal structure and licenses.
- Present the founders and key people, with the skills each one brings.
- Name the gaps in the team and how you plan to fill them.
Milestone: The company description, products and services, and management sections are drafted.
Marketing and Sales Plan (Week 4)
Show how customers will find you and buy from you.
- Choose two or three channels you can actually run, such as local search, social media, partnerships or direct sales.
- Describe the path from first contact to payment, step by step.
- Set realistic sales targets for the first year, month by month, based on your channel tests and research.
- Note what each channel costs in time and money.
Milestone: A marketing and sales section with named channels and a monthly sales target you can explain.
Financial Projections (Week 5)
Turn everything you wrote into numbers a reader can check.
- List your startup costs: equipment, setup, deposits, first stock and legal fees.
- Build a monthly forecast for the first year: sales, costs and cash in the bank at the end of each month.
- Find your break-even point: the sales level where income covers all costs.
- If you need money, write how much, what it pays for and when it will be repaid or what investors get in return.
Milestone: A spreadsheet with startup costs, a 12-month cash flow forecast and a break-even figure, with every assumption written next to it.
Executive Summary and Review (Week 6)
Write the summary, get feedback and ship the plan.
- Write the executive summary in one page: the problem, your offer, your market, your team, your numbers and your request.
- Send the plan to two people: one who knows your industry and one who knows nothing about it.
- Fix every point both readers stumbled on.
- Proofread, export to PDF and send it to your first reader.
Milestone: The plan has been reviewed by two people and sent to its first real reader.
Which Type of Business Plan Do You Need
There are two main formats. A lean plan fits on one page and covers the essentials in short blocks: problem, solution, customers, channels, revenue, costs and key metrics. It is fast to write and easy to update, so it works well when you are still testing an idea or planning for yourself.
A traditional plan is a longer document with full sections and detailed financials. Banks, investors and some grant programs usually expect this format, because they need to see your reasoning and your numbers in detail. If you are not sure, start lean in Week 1, then expand each block into a full section during the following weeks. You lose nothing, because the lean version becomes your outline.
What Goes in Each Section
A traditional business plan usually follows the same order. Readers expect it, so keeping this order makes your plan easier to read.
If you are not asking for money, skip the funding request. Keep the other sections, even if some are short.
- Executive summary: a one-page overview of the whole plan, written last but placed first.
- Company description: what the business does, its legal structure, location and goals.
- Market analysis: your target customers, the size and trends of your market, and your competitors.
- Organization and management: the founders, the team, advisors and who decides what.
- Products or services: what you sell, how it is priced and what makes it different.
- Marketing and sales: how you will reach customers and turn them into buyers.
- Funding request: how much you need, what it pays for and over what period.
- Financial projections: forecasts of sales, costs, cash flow and profit.
- Appendix: supporting documents such as resumes, licenses, quotes from suppliers or research notes.
How to Build the Financial Projections Without a Finance Background
The numbers can feel scary if you are new to this, but they come from what you wrote in the earlier weeks. Your sales forecast comes from your marketing plan. Your costs come from your operations section. The financials are those two sections turned into a spreadsheet.
Start with a simple sheet: one row per income or cost line, one column per month for the first year. Write every assumption in plain words next to its number, for example "two new clients per month from local search, based on the first test month". A reader will forgive a cautious forecast. They will not trust a number with no reason behind it.
- Build a prudent version and an optimistic version, and present the prudent one.
- Watch cash, not only profit: a business can be profitable on paper and still run out of money.
- Ask an accountant to check the sheet before Week 6 if the plan supports a loan or investment.
How to Get Feedback That Actually Improves the Plan
Feedback in Week 6 works best when you ask precise questions. "What do you think?" gets polite answers. "Which part did you find hardest to believe?" and "What would you ask me before giving money?" get useful ones.
Choose two very different readers. Someone from your industry will catch weak assumptions about costs, suppliers or competitors. Someone outside it will show you where the plan uses jargon or skips steps. If both readers stop on the same page, rewrite that page first.
How to Keep the Plan Alive After Week 6
A business plan is not a document you write once and forget. Once the business starts, compare your real numbers with the forecast every month. Where reality is different, update the plan and note why.
Review the full plan every quarter, or as soon as something important changes: a new competitor, a price change, a new hire or a funding round. A plan that matches what is really happening is far more useful to you, and far more convincing to the next reader, than a polished document from last year.
Common mistakes to avoid
- Writing the executive summary first forces you to guess. Write it last, once every section is done.
- Using market figures with no source. Note where each number comes from, or leave it out.
- Saying "everyone" is your customer. Describe one specific customer type you can actually reach.
- Ignoring competitors or alternatives. List what people use today, even if it is a spreadsheet or doing nothing.
- Forecasting sales with no link to your marketing plan. Tie each sales figure to a channel and an assumption.
- Making the plan too long to read. Cut anything that does not help the reader decide.
Frequently asked questions
How long should a business plan be?
A lean plan fits on one page. A traditional plan for a bank or investor is much longer, with detailed financials in the appendix. The right length is the shortest one that answers your reader's questions. If a page does not help them decide, cut it.
Can I write a business plan on my own?
Yes. You can write a first plan on your own, and this roadmap is built for one person working part time. Ask an accountant or advisor to check the financial projections, especially if the plan supports a loan or investment.
Which section of a business plan is the most important?
Readers tend to look closely at the executive summary, the financial projections and the team. The summary must make them want to read on, and the numbers must be believable. A strong market analysis supports both.
Do I need a business plan if I am not raising money?
It still helps. Writing the plan forces you to check your market, your prices and your cash needs before you spend money. A short lean plan can be enough when the plan is only for you.
How often should I update my business plan?
Compare real results with your forecast every month and update the plan every quarter. Update it right away after any major change, such as a new product, a price change or new funding.