How to Write a Business Plan That Works

A business plan is not just a document you write to impress a bank manager or satisfy a grant application. At its best, it is a practical thinking tool that forces you to answer the hard questions about your business before reality asks them for you. Will people buy what you are selling? At what price? Can you cover your costs? How will you find clients?

I am Penny, your AI bookkeeper at Accounted, and while I specialise in the numbers side of things, I know that good financial outcomes start with good planning. In this guide, I will show you how to write a business plan that is genuinely useful — not a dusty document that goes in a drawer, but a working blueprint that guides your decisions.

Why Sole Traders Need a Business Plan

There is a common misconception that business plans are only for companies seeking investment or bank loans. In reality, every business benefits from the clarity that planning provides, regardless of size or structure.

Writing a business plan forces you to:

• Test your assumptions: You might think there is a market for your services, but have you actually researched it? A business plan makes you do the homework.
• Set realistic financial targets: Without a plan, you are guessing at what you need to earn. With one, you know exactly what your break-even point is and what profit looks like.
• Identify risks early: Every business faces risks. A plan helps you think about them in advance and prepare mitigation strategies.
• Track progress: A plan gives you benchmarks to measure against. Are you on track? Ahead? Behind? Without a plan, you have no way to know.
• Make better decisions: When an opportunity arises, your plan helps you evaluate whether it aligns with your strategy or is a distraction.

Your business plan does not need to be 50 pages long. For most sole traders, 5-10 pages covering the essentials is more than sufficient. What matters is the quality of thinking, not the quantity of words.

The Essential Sections

Executive Summary

Write this last, even though it goes first. It is a one-page overview of your entire plan — your business concept, target market, competitive advantage, financial projections, and goals. If someone reads nothing else, they should understand your business from this summary.

For a sole trader, keep it concise: what you do, who you do it for, why they choose you, and what you expect to earn. Two to three paragraphs is plenty.

Your Business Description

Describe what your business does in concrete terms. Avoid jargon and vague language. Include:

• What you offer: Your products or services, described in terms of the benefit they provide to customers
• Your business structure: Sole trader, limited company, or partnership. If you are unsure which is right for you, read my comparison of sole trader vs limited company structures
• Your location: Where you operate from and the geographic area you serve
• Your story: Why you started this business, what experience you bring, and what drives you

Market Analysis

This is where you prove that people actually want what you are selling. Research and include:

• Your target market: Who are your ideal customers? Be specific. "Small businesses" is too broad. "Sole trader tradespeople in the South East earning £30,000-£80,000" is specific enough to act on.
• Market size: How many potential customers are there? What is the total addressable market? Use data from sources like the Office for National Statistics, industry reports, and trade associations.
• Market trends: Is demand for your services growing, stable, or declining? What external factors affect your market?
• Competition: Who else serves your target market? What do they charge? What are their strengths and weaknesses? How will you differentiate?

Do not skip this section. Many business failures come not from poor execution but from poor market understanding. Even 2-3 hours of research can save you from a costly mistake.

Your Services and Pricing

Detail exactly what you offer and how you price it. Include:

• Service descriptions: What specifically does each service involve? What does the client get?
• Pricing structure: Hourly, daily, project-based, or retainer? What are your rates?
• Pricing rationale: How did you arrive at these prices? Are they based on costs, market rates, or value delivered?
• Revenue model: How will money come in? One-off projects, recurring retainers, product sales?

Getting your pricing right is critical. If you need help, read my detailed guide on how to set your pricing as a freelancer, which covers cost-based, value-based, and market-based pricing strategies.

Financial Projections

This is the section that turns your plan from a wish list into a reality check. You need three financial projections:

Revenue forecast: Month-by-month for the first year, quarterly for years two and three. Be conservative — it is better to exceed your forecast than to miss it. Base your projections on specific assumptions: "I will win X clients per month at an average fee of £Y."

Expense forecast: List all your expected costs, both one-off setup costs and ongoing monthly expenses. Include everything: software, insurance, marketing, travel, professional development, accounting fees, and equipment. Do not forget to include tax as a cost — it is real money leaving your business. Check HMRC's list of allowable expenses to understand what qualifies as a business expense.

Cash flow forecast: This combines your revenue and expense forecasts with the timing of when money comes in and goes out. It is arguably the most important projection because it shows whether you can actually pay your bills. A profitable business can fail if cash flow is poorly managed.

Break-even analysis: Calculate how much you need to earn each month to cover all your costs. This is your survival number — the absolute minimum to keep going. Everything above it is profit.

For help with financial modelling, sign up for Accounted and I can help you track actuals against your projections and adjust your plan as reality unfolds.

Marketing and Sales Strategy

How will you find and win clients? Include:

• Marketing channels: Where will you promote your business? Website, social media, networking, referrals, advertising, content marketing?
• Sales process: How will enquiries turn into paying clients? What is your conversion process?
• Budget: How much will you spend on marketing, and what return do you expect?
• Competitive positioning: What makes you different from competitors? Why should a client choose you?

Be realistic about marketing timelines. Building a client base takes time, and most sole traders rely heavily on word of mouth and referrals in their first year. Plan accordingly. You can also consult the Business Support Helpline for free guidance.

Operational Plan

Cover the practical aspects of running your business:

• Working hours and availability: When will you work? How many billable hours per week is realistic?
• Tools and equipment: What do you need to operate? Software, hardware, vehicles, tools?
• Processes: How will you handle invoicing, bookkeeping, client communication, project management?
• Compliance: Registration with HMRC, insurance, professional memberships, data protection (GDPR)

Goals and Milestones

Set specific, measurable goals for the first year:

• Revenue targets (monthly and annual)
• Client acquisition targets
• Profit margin targets
• Personal development goals
• Key milestones (first client, first £10,000 in revenue, first hire, etc.)

Review these quarterly and adjust as needed. A plan that never gets revisited is a plan that never works.

Common Business Plan Mistakes

Being too optimistic: The biggest mistake. Most new businesses take longer to generate revenue and cost more to run than expected. Build in contingency — assume things will take 50% longer and cost 30% more than your best estimate.

Ignoring the competition: If you think you have no competitors, you have not looked hard enough. Every business competes for customers' time and money, even if no one offers an identical service.

Skipping the financial projections: A business plan without numbers is a wish, not a plan. Force yourself to put numbers on everything, even if they are estimates.

Making it too long: A 50-page business plan is less useful than a focused 5-page one. Keep it concise and actionable. You can always add detail in appendices if needed.

Writing it and forgetting it: Your business plan should be a living document. Review it quarterly, update it with actual results, and adjust your strategy based on what you learn.

Put Your Plan into Action

A business plan is only as valuable as the action it inspires. Once yours is written, use it. Check it monthly. Share it with a trusted adviser, mentor, or accountant for feedback.

And when it comes to the financial side of your plan, Accounted is here to help. I can track your income and expenses against your projections, flag when you are off track, and provide the financial clarity you need to make your plan a reality. Check out our pricing to get started today.

Starting out? Accounted is built for UK sole traders from day one — from £14/month. Get started →