Start a Business guide
Do I Actually Need a Business Plan to Start?
Should you write a business plan before starting? Learn the difference between a formal document and the act of planning for a new UK business.
Published 22 May 2024
The short answer
You do not necessarily need a formal, forty-page document to start a business, but you absolutely need to have done the work of planning. A long document is often a distraction from testing an idea with real customers, whereas a lean approach to planning focuses on the specific commercial assumptions that will determine whether your business succeeds or fails.
- A formal plan is often a guess disguised as a document
- Planning is a continuous process, not a one-time event
- Focus on your commercial model and customer evidence first
- Formal documents are usually only required for external funding
- Avoid spending weeks on a plan before you have talked to a customer
Why traditional business plans often fail startups
The traditional business plan was designed for a different era of commerce, where capital was hard to access and market data was scarce. In that context, a long document full of five-year projections and extensive market research was a way to signal seriousness to a bank manager. For a modern startup, particularly a service or B2B business, this approach is often counter-productive because it relies on making detailed guesses about a future that has not happened yet.
Most startup business plans are wrong the moment they meet a real customer. The time spent polishing a forty-page document is time not spent talking to prospects, testing pricing, or refining the service. If you spend three weeks writing a plan only to discover in week four that customers do not want what you are selling, those three weeks were wasted. A plan should be a tool for action, not a substitute for it.
The danger of a long plan is that it creates a false sense of certainty. When you have written down a detailed strategy, you become emotionally attached to it, making it harder to pivot when evidence suggests a different path would be more successful. Startups need agility, and a rigid, lengthy document is the opposite of agile.
What is the difference between a plan and planning?
It is important to distinguish between the document — the business plan — and the activity — planning. You might not need the document, but you definitely need to do the planning. Planning involves thinking through who your customer is, why they will buy from you, what it costs to deliver your service, and how you will reach those people. This thinking is essential for any business to survive its first year.
Planning is a live, ongoing activity. It involves setting hypotheses and then testing them. For example, your plan might assume that customers will pay fifty pounds an hour for your service. The planning process involves figuring out how to test that assumption next week, rather than just writing it into a spreadsheet and assuming it is true. A good founder is always planning, even if they never produce a formal document.
When you focus on the act of planning, you are looking for risks and opportunities. You are asking what could go wrong and how you would respond. This kind of thinking prepares you for the reality of running a business far better than a static document ever could.
When is a formal business plan document mandatory?
There are specific situations where a formal, written business plan is not optional. If you are applying for a bank loan, seeking investment from an angel or venture capital firm, or applying for certain government grants, you will be expected to provide a structured document that follows their specific requirements. In these cases, the plan is a communication tool used to convince an external party that you understand your market and your finances.
Even in these situations, the document should be built on the back of real evidence. An investor is far more interested in the fact that you have already spoken to twenty potential customers and have three letters of intent than they are in a glossy graph showing exponential growth in year five. If you need a plan for funding, focus on the evidence of demand and the realism of your financial projections.
If you are self-funding or starting a small service business, the requirement for a formal document is much lower. In the early stages, your time is almost always better spent on validation and sales than on document formatting.
What should I focus on instead of a long document?
Instead of a traditional plan, focus on a lean commercial model. This means identifying the few core elements that make your business work. Who is the specific customer? What is the specific problem you solve? How do you reach them? What is your pricing model? What are your fixed and variable costs? If you can answer these questions clearly, you have a better start than most businesses with a full plan.
Use a simple one-page framework to capture these points. This keeps your thinking sharp and prevents you from hiding a lack of clarity behind a wall of text. A one-page plan is easy to share, easy to update, and easy to keep at the front of your mind as you make daily decisions. It should be a living document that changes as you learn more about your market.
The Evans Business Builder programme focuses on this kind of practical commercial development. Rather than writing a long plan, we help you challenge your assumptions and build the infrastructure needed to actually trade. The cost is nine hundred and ninety five pounds plus VAT per month for twelve months, and it includes the website your business needs to launch.
How do I keep my planning useful and lean?
To keep your planning useful, tie every part of it to a specific action or test. If your plan says you will use LinkedIn for marketing, your next step should be to reach out to five prospects on the platform to see if they respond. If your plan says your service will take four hours to deliver, your next step should be to run a pilot version to time yourself. Planning that does not lead to action is just daydreaming.
Review your planning weekly. Look at what you thought would happen, what actually happened, and what that means for your next steps. This feedback loop is the heart of a successful startup. It allows you to move quickly and avoid spending money on things that do not work. Your plan should be a collection of current best guesses that you are actively trying to prove or disprove.
Remember that the goal of a business is to make sales and deliver value, not to produce paperwork. If a planning activity is not helping you move closer to a sale or helping you deliver a better service, stop doing it. Keep your focus on the commercial reality of your business.
This guide provides general commercial guidance; for formal requirements related to bank loans or external investment, you should check the specific criteria of the lender or investor.
Next step
Not sure which idea to pursue? Use the free tool. Already chosen? Explore Evans Business Builder.