How to Write a Business Plan: A Step-by-Step Guide With Templates
To write a business plan, you set out what your business does, who its customers are, how it will reach them, how it will be run and how it will make money, backed by realistic numbers. For a loan or investment you will usually need a detailed traditional plan; for testing an idea, a one-page lean plan is often enough. This step-by-step guide follows the structure recommended by the US Small Business Administration (SBA) and includes practical tips for each section.
Why Do You Need a Business Plan?
A business plan forces you to test your idea before you spend serious money on it. It helps you spot gaps in your research, estimate how much cash you need, and decide whether the numbers add up. It is also the document banks, investors and grant providers ask for.
The stakes are real. According to the US Bureau of Labor Statistics, roughly one in five new private-sector businesses does not survive its first year, and about half close within five years. A plan will not guarantee success, but it makes it far more likely that you will spot problems early.
Should You Write a Traditional or a Lean Plan?
The SBA’s business plan guide describes two main formats:
- Traditional business plan: detailed and comprehensive, often dozens of pages. Lenders and investors commonly ask for this format, and it suits detail-oriented founders or anyone seeking traditional finance.
- Lean start-up plan: a high-level summary of the essentials that can take as little as an hour and fit on a single page. It suits fast-moving businesses, early idea testing or plans you expect to change often.
Many founders start with a lean plan to test their idea, then expand it into a traditional plan when they need funding. You do not have to follow any template exactly: use the sections that make sense for your business.
What Sections Should a Traditional Business Plan Include?
The SBA lists nine common sections. Here is what each should cover:
1. Executive summary
A short overview of what the company does and why it will succeed: your mission, product or service, leadership team, location and, if you are seeking funding, headline financials and growth plans. Write it last, once the rest of the plan is complete, and keep it to one or two pages.
2. Company description
Explain the problem you solve, who you serve and your competitive advantages, such as specialist expertise, a strong location or a proprietary process.
3. Market analysis
Show that you understand your industry and target market. Include the size of the market, trends, customer needs and a review of competitors: what do successful rivals do well, and how will you do it better or differently?
4. Organisation and management
Describe your legal structure, such as a sole proprietorship, LLC or corporation, and who runs the business. An organisational chart and short biographies of key people help show you have the right team. Our guide to LLCs and S corporations explains two popular US structures.
5. Service or product line
Describe what you sell, how it benefits customers, its life cycle and any intellectual property, such as trademarks, patents or copyrights, as well as research and development plans.
6. Marketing and sales
Explain how you will attract and keep customers and how a sale will actually happen. There is no single right strategy, so focus on the channels that suit your audience and budget.
7. Funding request
If you are raising money, state how much you need over the next five years, what you will use it for and the terms you would like, such as debt or equity.
8. Financial projections
Show that the business will be financially stable. Established businesses should include past income statements, balance sheets and cash-flow statements. New businesses should provide forecasts for the next five years, with more detailed monthly or quarterly figures for the first year.
9. Appendix
Supporting documents such as credit histories, CVs, product images, licences, permits, patents, legal documents and letters of reference.
What Goes in a One-Page Lean Plan?
A lean plan typically uses a grid of short boxes covering: key partners, key activities, key resources, value proposition, customer relationships, customer segments, channels, cost structure and revenue streams. The point is speed: you can fill it in during an afternoon, then test each assumption with real customers before investing more time.
How Do You Make Realistic Financial Projections?
Financial forecasts are where many plans lose credibility. To keep yours grounded:
- Build from the bottom up: estimate customers, average order value and purchase frequency rather than claiming a percentage of a huge market.
- List every cost: include rent, wages, software, insurance, taxes, marketing, equipment and your own pay.
- Plan cash flow, not just profit: many profitable businesses fail because cash arrives later than bills.
- Create three scenarios: a cautious, an expected and an optimistic case.
- Work out your break-even point: how many sales you need each month to cover costs.
- Keep a cash buffer: aim for several months of running costs in reserve.
What Mistakes Should You Avoid?
- Skipping customer research: talk to potential customers before writing projections.
- Ignoring competitors: “we have no competition” usually means the research is incomplete.
- Overly optimistic numbers: lenders discount hockey-stick growth curves without evidence.
- Too much jargon: write clearly enough for a non-specialist to follow.
- Writing it once and forgetting it: review your plan at least every few months and update it as you learn.
How Long Should a Business Plan Be?
There is no fixed length. A lean plan fits on one page. A traditional plan for a bank loan is often 15 to 30 pages plus appendices, while a plan for a large investment may be longer. Aim for the shortest document that answers your reader’s questions: lenders want to see how you will repay, investors want to see how the business will grow, and you want a practical roadmap. Use headings, tables and charts so busy readers can find key figures quickly.
Where Can You Get Free Help?
In the US, SCORE offers free mentoring from experienced business people, and Small Business Development Centers provide free or low-cost advice and training, often through local universities. Both can review your plan and point you to sources of finance. The SBA website also has free sample plans for a consulting firm and a toy company that you can adapt.
If you are starting on a tight budget, read our guide on how to start a business with no money, and use design thinking techniques to test your idea with real users.
Business Plan Checklist at a Glance
- Choose a format: lean for testing ideas, traditional for loans and investors
- Core sections: executive summary, company description, market analysis, management, products, marketing, funding request, financials, appendix
- Financials: five-year projections, monthly for year one, with cash flow and break-even
- Write last: the executive summary
- Update regularly: treat the plan as a living document
Featured image: Beale Street Brews Counter (26499287821), by Joshua Noble / Wikimedia Commons, CC BY-SA 2.0. Cropped, colour-graded and combined with MediaPavilion branding.
Sources
- US Small Business Administration — Write your business plan (accessed 27 October 2026).
- US Bureau of Labor Statistics — Entrepreneurship and the U.S. economy: survival of private sector establishments (accessed 27 October 2026).
