A business plan is a written document that explains how a business will operate and achieve its objectives. It normally describes the business idea, target customers, products or services, competitors, marketing strategy, daily operations and financial expectations.
The plan does not need to predict the future perfectly. Its purpose is to show that the business owner has researched the opportunity, considered the risks and created a realistic strategy.
A business plan may be written for internal planning, a bank application, an investor presentation or a government-backed funding application. The level of detail should therefore reflect who will read it and what decision they need to make.
Official guidance on writing a business plan is also available from GOV.UK.
Key Takeaways:
- A business plan explains what a business will offer, who its customers are and how it expects to operate and generate income.
- Most plans include an executive summary, market research, competitor analysis, marketing strategy, operational details and financial forecasts.
- Financial estimates should be realistic and supported by clear assumptions rather than optimistic guesses.
- The type and length of the plan should reflect its purpose, such as internal planning, applying for a loan or attracting investors.
- A strong plan acknowledges possible risks and explains how the business will respond to them.
- Business plans should be reviewed regularly as sales, costs, customers and market conditions change.
- A well-prepared plan cannot guarantee funding or success, but it can support better decisions and expose weaknesses before money is committed.
Last Updated: 30.07.2026
Why Is a Business Plan Important?
A carefully prepared business plan can help turn a general business idea into a practical course of action. It forces the owner to consider how the business will attract customers, cover its costs and respond to competitors.
A business plan can help with:
- Testing whether a business idea is commercially realistic
- Estimating startup and operating costs
- Understanding the target market
- Setting measurable goals
- Applying for loans or investment
- Identifying potential risks
- Monitoring the progress of the business
Before developing the plan, it is useful to spend time choosing and validating a business idea. A plan will be more useful when the product, customer and business objective are clearly defined.
Which Type of Business Plan Should You Use?
The most appropriate format depends on the age of the business, the complexity of the idea and the reason the plan is being created.
A traditional business plan is usually a detailed document containing market research, financial forecasts, operating information and supporting evidence. This format is often suitable for loan applications, investors and businesses with significant startup costs.
A lean business plan is shorter and may fit on one or two pages. It summarises the business model, customer, value proposition, sales channels, costs and expected income. It can be suitable for testing an early idea or managing a small owner-operated business.
A funding business plan should be more detailed. It must clearly explain how much money is needed, how it will be used, how repayments may be made and what evidence supports the financial assumptions.
What Should a Business Plan Include?
Most business plans contain the following sections:
- Executive summary
- Business description
- Business objectives
- Products or services
- Market and competitor research
- Marketing and sales strategy
- Operations and management
- Financial forecasts
- Funding requirements
- Risks and supporting documents
The exact structure can be adjusted, but each section should provide useful information rather than general statements.
How Do You Write a Business Plan Step by Step?
1. Prepare the Executive Summary
The executive summary provides a short overview of the entire business plan. It should explain what the business does, who it serves, what makes it different and what it expects to achieve.
Although this section appears first, it is usually easier to write it after completing the rest of the plan.
A useful executive summary may include:
- The business name and location
- The product or service
- The target customer
- The main competitive advantage
- The business objectives
- The amount of funding required
- A brief summary of the financial forecast
Keep the section focused. A lender or investor should be able to understand the main opportunity without reading the entire document.
2. Describe the Business and Its Objectives
Explain what the business will do and why it is being created. Include the problem it intends to solve and the value it will provide to customers.
The objectives should be specific and measurable. For example, “increase sales” is too vague. A clearer objective would be to secure 100 paying customers within the first six months.
This section may also explain the proposed legal structure, such as a sole trader, partnership or limited company. Readers considering the simplest structure can learn more about setting up as a sole trader.
3. Explain the Product or Service
Describe exactly what the business will sell. Avoid assuming that the reader already understands the product.
Explain:
- What the product or service does
- Who needs it
- How customers will use it
- How it will be priced
- How it differs from existing alternatives
- Whether any suppliers, equipment or specialist skills are required
Do not rely on statements such as “the product is unique” or “everyone will want it.” Support important claims with research, evidence or customer feedback.
4. Identify the Target Market
A business plan should define the customers most likely to buy the product or service.
Depending on the business, the target market may be described by:
- Location
- Age group
- Income
- Occupation
- Business size
- Industry
- Buying behaviour
- Customer problem
- Preferred sales channel
Avoid defining the target market as “everyone.” A smaller, clearly identified audience usually creates a more credible marketing and sales plan.
5. Conduct Market and Competitor Research
Market research should show that genuine demand may exist. Use reliable information such as industry reports, government data, customer interviews, surveys and competitor research.
The competitor section should identify both direct and indirect competitors. A direct competitor may sell a similar product, while an indirect competitor may solve the same customer problem differently.
For each major competitor, consider:
- Products or services
- Pricing
- Target customers
- Location
- Marketing channels
- Strengths
- Weaknesses
- Customer reviews
The aim is not to claim that the business has no competitors. A lack of visible competitors may mean that demand is weak or that the market has not been properly researched.
6. Create a Marketing and Sales Strategy
Explain how customers will discover the business and how interest will be converted into sales.
Potential marketing channels may include:
- Search engine optimisation
- Social media
- Email marketing
- Paid advertising
- Local partnerships
- Networking
- Direct sales
- Referral programmes
- Events
- Physical advertising
The strategy should connect each channel to the target customer. For example, a business selling professional services to local companies may prioritise networking and direct outreach rather than relying entirely on consumer-focused social media.
A more detailed business marketing strategy can be developed after the target audience and sales process have been defined.
7. Explain How the Business Will Operate
The operations section explains how the business will deliver its products or services.
It may cover:
- Business premises
- Working hours
- Suppliers
- Equipment
- Technology
- Stock management
- Delivery
- Customer support
- Staffing
- Quality control
- Insurance
- Licences or permissions
There is no single licence required by every UK business. Requirements depend on the activity, industry and location, so business owners should check the relevant official guidance.
The plan should also account for suitable protection and operating expenses. For example, businesses dealing with members of the public may need to consider small-business liability insurance costs.
8. Describe the Management Team
Explain who will manage the business and what relevant experience they bring.
For each important person, include:
- Their role
- Relevant experience
- Professional qualifications
- Main responsibilities
- Skills they contribute
- Any important skills gaps
A new business does not need a large management team. However, the plan should explain how essential responsibilities such as sales, bookkeeping, customer support and operations will be handled.
Where skills are missing, explain whether the business will hire an employee, use a freelancer or work with a professional adviser.
9. Prepare the Financial Forecasts
The financial section is one of the most important parts of a business plan. It should show how much money the business needs, where income may come from and when the business could become financially sustainable.
Include realistic estimates for:
- Startup costs
- Monthly operating costs
- Sales
- Gross profit
- Net profit
- Cash flow
- Tax
- Loan repayments
- Break-even point
- Emergency reserves
The assumptions behind every major figure should be explained. For example, a sales forecast should show the expected number of customers, average order value and frequency of purchase.
Do not increase the forecast simply to make the opportunity look more attractive. Lenders and investors are likely to question figures that are not supported by evidence.
Practical templates and examples are available through the Start Up Loans business-planning guidance.
10. Explain the Funding Requirement
A business seeking funding should state:
- How much money is required
- What the money will be used for
- Whether the owner is investing personal funds
- When the money will be needed
- How the funding will support growth
- How a loan could be repaid
- What could happen if sales are lower than forecast
Avoid asking for a general amount without a detailed cost breakdown. A lender should be able to see how the requested funding connects to the financial forecast.
11. Identify the Main Business Risks
Every business involves risk. A credible plan acknowledges those risks and explains how they will be managed.
Possible risks include:
- Lower-than-expected demand
- Rising supplier costs
- Loss of an important customer
- Cash-flow shortages
- Staff shortages
- Regulatory changes
- Equipment failure
- Increased competition
- Cybersecurity incidents
For each significant risk, describe the potential impact and the action the business would take.
What Financial Information Should You Include?
Financial information should normally cover at least the first 12 months of trading. Some lenders or investors may ask for forecasts covering two or three years.
The main documents may include:
Startup Cost Forecast
List one-off costs such as equipment, stock, website development, professional fees, deposits, licences and initial marketing.
Sales Forecast
Estimate how many products or services may be sold and at what price. Explain the evidence supporting these assumptions.
Cash-Flow Forecast
A cash-flow forecast records when money is expected to enter and leave the business. A profitable business can still fail if it does not have enough cash available to pay bills when they become due.
Profit-and-Loss Forecast
This forecast estimates revenue, costs and expected profit over a set period.
Break-Even Calculation
The break-even point shows how much the business must sell before its total income covers its costs.
Financial forecasts are estimates rather than guarantees. They should be based on reasonable evidence and updated when actual trading results become available.
What Are the Most Common Business Plan Mistakes?
A business plan may appear weak when it includes unsupported claims, unrealistic forecasts or unclear objectives.
Common mistakes include:
- Overestimating sales
- Underestimating costs
- Ignoring competitors
- Using outdated market information
- Confusing revenue with profit
- Failing to explain financial assumptions
- Targeting an audience that is too broad
- Including excessive background information
- Avoiding discussion of risk
- Failing to update the plan
The plan should be reviewed from the perspective of someone who knows nothing about the business. Every important claim should either be explained or supported.
How Long Should a Business Plan Be?
There is no mandatory length. A small internal plan may only require a few pages, while a detailed funding application may be considerably longer.
The document should contain enough information to support its purpose without repeating points or adding irrelevant background. Clarity and evidence are more important than word count.
Supporting information such as detailed research, management CVs, technical documents and full financial calculations can be placed in an appendix.
How Often Should a Business Plan Be Updated?
A business plan should not be treated as a document that is written once and forgotten.
It should be reviewed when:
- Actual sales differ significantly from forecasts
- Costs increase
- The business introduces a new product
- The target market changes
- Funding is required
- A major competitor enters the market
- The business hires staff or expands
- New regulations affect operations
Many small businesses may benefit from reviewing their plan at least every three to six months during the early stages.
What Should You Do After Completing the Plan?
After completing the business plan, check that the figures are consistent and that each claim is supported. Ask an independent person, accountant or business adviser to review it.
The next steps may include registering the business, arranging insurance, setting up financial records and choosing a suitable business bank account.
Free planning tools are also available from The King’s Trust business-plan resources.
Conclusion
Learning how to make a business plan involves more than describing a business idea. A useful plan must explain the target market, competition, sales strategy, operating model, financial expectations and potential risks.
The strongest plans are realistic, evidence-based and regularly updated. A clear business plan cannot guarantee success or funding, but it can help a business owner make better decisions and demonstrate that the opportunity has been properly considered.
Frequently Asked Questions
Can I write a business plan myself?
Yes. Many sole traders and small-business owners prepare their own plans using reliable guidance and templates. However, an accountant or business adviser can help review complex financial forecasts, funding requirements or legal considerations.
How long should a business plan be?
There is no required length. A lean internal plan may be only a few pages, while a detailed plan for a lender or investor may be considerably longer. The document should include enough evidence to support its purpose without unnecessary repetition.
Do I need a business plan to start a small business?
A business plan is not legally required for every UK business, but it can help clarify costs, customers, pricing, risks and objectives. A lender, investor or funding programme may also request one before considering an application.
What is the most important part of a business plan?
Every section has a purpose, but the financial forecasts, market research and explanation of customer demand are particularly important. These sections help demonstrate whether the idea is commercially realistic.
How far ahead should a business plan forecast?
Many new businesses prepare monthly forecasts for the first 12 months and broader projections for the following two or three years. The appropriate period may depend on the lender, investor and nature of the business.
How often should a business plan be updated?
A new business may benefit from reviewing its plan every three to six months. It should also be updated when costs change, sales differ from expectations, new products are introduced or additional funding is required.
Can a business plan guarantee that I will receive funding?
No. A clear and evidence-based plan may strengthen an application, but lenders and investors will also consider affordability, risk, credit history, management experience and the commercial potential of the business.
Note
This guide provides general information about preparing a business plan for a UK business. It has been researched using official and established business-support sources and reviewed for clarity and practical relevance.
Financial forecasts are estimates rather than guarantees, and business, tax, banking, licensing and funding requirements can vary according to the organisation, industry and individual circumstances.
Readers should verify current requirements and consider advice from a qualified accountant, financial professional, solicitor or business adviser where appropriate.
