How to Write a Business Plan (UK): Structure, Sections & Tips

A business plan can be a powerful tool — or a document you write once and never look at again. The difference is whether it’s realistic and useful. Here’s how to write one that actually helps, whether it’s for funding or for steering your own business.

What a business plan is for

Before you write, be clear on the purpose, because it shapes everything:

• To raise funding — it needs to convince a lender or investor, with credible financials front and centre.
• To guide your decisions — it can be leaner, focused on your strategy and numbers.

Either way, a good plan forces you to think through the things that are easy to skip when you’re excited about an idea.

The standard sections

Most business plans include:

1. Executive summary — a short overview of the whole plan (write it last). For many readers, this is the bit that decides whether they keep reading.
2. The business — what you do, your products or services, and what makes you different.
3. Market and competitors — who your customers are, the size of the opportunity, and who you’re up against.
4. Marketing and sales — how you’ll reach and win customers.
5. Team and operations — who’s involved, and how the business runs day to day.
6. Financials — the section that does the heavy lifting (below).

The financials are what get judged

This is where plans succeed or fail. Lenders and investors look hardest at:

• A sales forecast — realistic, with your assumptions shown
• A profit and loss projection
• A cash flow forecast — see how to build one
• Your funding requirement — how much you need and exactly what it’s for

The most common reason a plan is rejected isn’t a weak idea — it’s unrealistic or vague numbers. Forecasts that are clearly thought-through, with sensible assumptions, build credibility; hockey-stick projections with no basis destroy it.

Tips for a plan people take seriously

• Be realistic, not optimistic — under-promise on the numbers
• Show your assumptions — readers trust a plan they can interrogate
• Keep it clear — a tight 10 pages beats a rambling 40
• Update it — a living plan you revisit is far more useful than one filed away

Get the numbers right

You can write the narrative yourself — you know your business best. But the financial forecasts are where a fresh, expert eye pays off, because that’s what gets scrutinised. Our small business accountants and accountants for startups build credible, fundable financial forecasts and, through our management accounts service, help you track performance against the plan once you’re trading.