To learn how to write a business plan, start by choosing a format, then work through a fixed set of sections: an executive summary, company description, market analysis, organization, products or services, marketing and sales, a funding request and financial projections. Research comes first, numbers come last, and the executive summary is usually written at the very end.
This guide from the Glorvix.com editorial team walks through each step in plain language, so you can produce a plan that is useful to you as well as to lenders or investors.
Key takeaways
- Decide between a traditional plan (detailed, lender-ready) and a lean plan (short, fast to update) before you start writing.
- Do your market research before you write the marketing and financial sections, because both depend on it.
- Financial projections should be explained clearly and match any funding you request.
- Write the executive summary last, once every other section is settled.
- Treat the plan as a living document and review it regularly.
Why a business plan is worth the effort
A business plan forces you to test an idea on paper before you commit serious money to it. Writing down who your customers are, what they will pay and what it will cost to serve them often exposes gaps that are easy to miss in conversation.
Lenders and investors commonly ask for one, and even if nobody else reads it, the plan gives you a benchmark to measure progress against.
Step 1: Choose a traditional or lean plan
The U.S. Small Business Administration describes two common formats in its business plan guidance: a traditional plan, which goes into detail across standard sections, and a lean startup plan, which summarizes the business in a handful of key elements. The right choice depends on your audience and how quickly your idea is changing.
| Factor | Traditional plan | Lean plan |
|---|---|---|
| Length | Long, multi-section document | Often a single page or chart |
| Time to write | Days to weeks | Hours |
| Best for | Loan applications, investor pitches, complex businesses | Testing ideas, simple businesses, fast-changing plans |
| Financial detail | Full projections and statements | Cost structure and revenue streams only |
| Drawback | Can go out of date quickly | Lenders may ask for more information |
Many owners start with a lean plan to validate the idea, then expand it into a traditional plan when they need financing.
Step 2: Do your market research
Your marketing section and your financial projections both rest on research, so do this work early. The goal is to understand demand, customers and competitors well enough to make realistic assumptions.
What to research
- Industry outlook: Is the market growing, stable or shrinking, and what trends are shaping it?
- Target customers: Who buys, why they buy, how often and through which channels.
- Competitors: What successful competitors do well, how they price and where they leave gaps.
- Market size: A grounded estimate of how many potential customers you can realistically reach.
Where to find it
Combine existing sources, such as government statistics and industry association reports, with direct research like customer interviews, short surveys and test sales. The SBA’s market research and competitive analysis section lists useful starting points for both approaches.
If you plan to sell online, the Glorvix.com team also recommends looking at how people search for what you offer. It can confirm demand and reveal the words customers actually use.
Step 3: Write the core sections
A traditional plan usually follows the order below. Keep each section focused and back claims with evidence from your research.
- Company description: The problem you solve, who you serve and the advantages that set you apart.
- Market analysis: A summary of your research on the industry, customers and competitors.
- Organization and management: Your legal structure, who runs what and the relevant experience of key people.
- Products or services: What you sell, how it benefits customers and any intellectual property or development plans.
- Marketing and sales: How you will attract and keep customers, and how a sale actually happens.
- Funding request: How much you need, what it is for, the type of funding and the time period it covers.
- Financial projections: Your forecast of income, costs and cash.
- Appendix: Supporting documents such as resumes, permits, contracts or credit history.
For the marketing section, be specific about channels and costs. Our guide to setting a small business marketing budget can help you turn a broad strategy into figures you can defend.
If you choose a lean plan
A lean plan replaces long sections with short entries. Common elements include key partnerships, key activities, key resources, value proposition, customer relationships, customer segments, channels, cost structure and revenue streams. Keep each entry to a few lines.
Step 4: Build your financial projections
This is the section lenders and investors read most closely. Your aim is to show that the business can become financially sustainable, using assumptions that a sceptical reader would accept.
What to include
- Startup costs: Equipment, fit-out, licences, initial inventory and launch marketing.
- Projected income statement: Expected revenue, cost of goods sold and operating expenses.
- Cash flow forecast: When money actually comes in and goes out, month by month for the first year.
- Balance sheet: Assets, liabilities and owner’s equity at key points.
- Break-even analysis: The sales level at which revenue covers all costs.
The SBA suggests projecting several years ahead and being more detailed, such as quarterly or monthly, for the first year. Established businesses are also expected to include historical financial statements.
Keep assumptions honest
State every key assumption, such as price, conversion rate or average order value, and explain where it came from. Build a conservative scenario alongside your expected one. Cash timing matters as much as profit, which is why our article on small business cash flow is worth reading before you finalize your forecast.
If you are unsure about tax, lending terms or legal structure, check your numbers with a qualified accountant or adviser. You can also browse the finance section for related guides.
Step 5: Write the executive summary last
The executive summary sits at the front of the plan but should be written at the end. It is a one- or two-page overview of what the company does, who it serves, why it will succeed and, if relevant, how much funding you are seeking.
Many readers decide whether to continue based on this section alone, so lead with the opportunity and include only the key numbers.
Step 6: Review and keep it current
Before sharing the plan, ask someone outside the business to read it and point out anything unclear or unconvincing. Check that figures are consistent between sections, especially funding and projections.
After launch, compare actual results with your forecasts and update the plan at least once a year, or whenever something significant changes. At Glorvix.com we see owners get the most value when the plan guides real decisions rather than sitting in a folder. More practical guides are available in our business section. For a closely related topic, read our guide to How to Build an Emergency Fund.
Frequently asked questions
How long should a business plan be?
There is no fixed length. A lean plan can fit on one page, while a traditional plan prepared for a lender often runs to many pages plus appendices. Aim for the shortest document that answers your reader’s questions clearly, and cut any section that repeats information without adding new evidence or detail.
Do I need a business plan if I am not seeking funding?
It is not legally required, but it is still useful. A plan helps you test assumptions, set targets and spot costs you might otherwise miss. A lean plan is often enough when nobody else needs to read it, and you can expand it later if you decide to apply for a loan or approach investors.
What is the most important section of a business plan?
It depends on the reader. Lenders and investors focus heavily on the financial projections and funding request, while the executive summary determines whether they keep reading at all. For your own use, the market analysis often matters most, because weak research undermines every assumption that follows in the marketing and financial sections.
How often should I update my business plan?
Review it at least once a year and whenever something important changes, such as a new product, a shift in costs, a major competitor or a funding round. Comparing actual results with your projections each quarter helps you adjust targets early instead of discovering problems only at year end.
