A business plan has a bad name, and often it deserves one. Many people picture a long document that you write once, show to a bank, and never open again. Written that way, it really is a waste of a weekend.
A good plan does something much simpler. It makes you answer the handful of questions that decide whether a business works: who buys this, why they pick you instead of someone else, what it costs to deliver, and what happens if sales arrive more slowly than you hope. You can answer all of that in a few pages.
This guide covers who the plan is for, the sections it needs, how to build the numbers so they mean something, and how to keep the plan useful once it is written.
First, Decide Who Will Read It
The reader sets the length and the tone. Write for the wrong one and you either waste weeks or fail to convince anybody. There are three common readers.
Yourself
This is the version most people actually need, and the one most people skip. It is short, blunt and private. Its whole job is to show you the weak points while changing them is still cheap. Nobody else reads it, so there is no reason to make anything sound good.
A bank or an investor
Here the plan is a formal document. The reader wants to know how likely they are to get their money back, so they look hardest at your figures, your assumptions and the risks you have already thought about. This version is longer, more careful, and usually has the detailed numbers in an appendix at the back.
A partner, landlord or supplier
Someone deciding whether to rent you a unit, give you trade credit or join you needs only to believe you will still be trading in a year. Keep it short and specific. A few pages is plenty.
If you are not raising money, write the first version and stop. You can always expand it later. Plenty of people spend a month polishing a thirty-page document for a lender they never approach.
The Sections a Plan Needs
Order matters less than honesty, but this sequence works because each part builds on the one before it.
1. A short summary
One page at the front: what the business does, who it serves, why it will work, and what you need to start. Write it last. It is impossible to summarise thinking you have not done yet, which is why so many summaries are vague.
2. What you sell and the problem it solves
Describe the product or service plainly, in words a customer would use. Then say what problem it removes. If you cannot name the problem, you are usually describing something people would like rather than something they would pay for.
3. Who your customers are
Be specific. "Everyone" is the same as nobody, because you cannot afford to reach everyone and you cannot write a message that suits them all. "Parents of primary school children within five miles" gives you something to work with. A smaller, clearer group is easier to find and cheaper to sell to.
4. The market and the competition
Name real competitors, including the awkward ones. Then explain what you offer that they do not: lower price, faster delivery, better service, a location they do not cover, or knowledge of a group they ignore.
Writing "we have no competition" is a warning sign to anybody reading, and usually to you as well. It normally means either that customers currently solve the problem some other way, or that nobody is paying to solve it at all. Both are worth knowing before you start.
5. How you will reach customers
This is the section weak plans rush, and it is the one that decides most outcomes. Say exactly how the first hundred people will hear about you, and roughly what each customer costs to win. A plan that assumes people simply arrive is not a plan.
6. How the business will run
The practical machinery: where the work happens, who supplies you, who does what, what equipment or software you need, and how you are set up legally. If it is only you for now, say so and note which jobs you would hand over first as things grow.
7. The numbers
The part that needs its own section, below.
The Numbers: Where Most Plans Fall Apart
You do not need to be an accountant. Four things cover almost everything, and each one is ordinary arithmetic.
What it costs to start
List every cost before your first sale: equipment, stock, deposits, registration, insurance, software, a website. Add a buffer of a quarter on top, because first-time founders almost always miss something. Then add the money you personally need to live on until the business pays you, which is the cost people forget most often.
A forecast built from the bottom up
Never start from the size of the market. "The market is worth two billion and we will take one per cent" is not a forecast; it is a wish with a number attached, and any experienced reader will stop taking the plan seriously at that line.
Build it upwards from things you can count instead. How many customers can you realistically serve in a week? What does each one spend? How many weeks will you actually trade, allowing for quiet periods and holidays? Multiply those together. The result is usually far smaller than the market-share version, and far more useful.
Your break-even point
Break-even is the point where money coming in covers money going out. To find it, separate your fixed costs, which you pay whatever happens, such as rent and insurance, from your variable costs, which rise with each sale, such as materials and postage.
Take the price of one sale, subtract the variable cost of that sale, and you have what each sale contributes. Divide your monthly fixed costs by that figure and you know how many sales a month you need to survive. If that number startles you, the plan has just done its job. Our look at the real arithmetic behind dropshipping shows how thin margins can make that number much higher than expected.
Cash flow, which is not the same as profit
This distinction closes more small businesses than weak sales do. Profit is what is left after costs over a period. Cash flow is when money actually arrives and leaves your account.
A business can be profitable on paper and still fail. You buy stock in March, sell it in April, and the customer pays in June, but your rent is due every month in between. Map month by month what comes in and what goes out, and you will see the gaps early enough to plan for them.
Finally, write three versions of the forecast: what you expect, a slower one where sales take twice as long, and a bad one. The slow version is the most valuable, because it tells you how long your money lasts if things simply take longer than planned. They usually do.
Write the One-Page Version First
Before writing anything long, put the whole business on a single page: the customer, the problem, your solution, the price, how people find you, your main costs, and the sales you need to break even.
This takes an afternoon and does most of the work. The gaps show up immediately, because a page has no room to hide behind long paragraphs. Fix those gaps, then expand only if a reader needs the longer document.
If you are building this around a job, be honest about the hours and money you have spare before you commit to anything. The side-hustle starter check is a quick way to test that, and our guide to starting a business without capital covers the models that need little or no money up front.
Test the Risky Assumptions Before You Polish It
Every plan rests on a few guesses. Usually they are that people want this, that they will pay your price, and that you can reach them for less than they are worth. If one of those is wrong, no amount of formatting saves the document.
So find the guess that would hurt most if it were wrong, and check it cheaply. Talk to twenty possible customers. Offer the thing before you build it and see whether anyone tries to buy. Our guide to exploratory research before you build covers how to do this properly, including why surveys are good for measuring an idea but poor for finding one.
Then write the real numbers in, including the ones you did not like. A plan built on tested guesses is worth something. A plan built on hopeful ones only tells you what you already believed.
Mistakes That Make a Plan Useless
- Forecasts with no working shown. If a reader cannot see where a number came from, they assume you invented it. Show the arithmetic.
- Only the good case. A single confident forecast reads as inexperience. Showing a slow case reads as competence.
- Vague customers. "Young professionals" is not a group you can reach. Narrow it until you could name where to find them.
- No plan for getting customers. Marketing described as "social media and word of mouth" is a gap, not a strategy.
- Forgetting to pay yourself. If the plan does not cover your own living costs, you will run out of patience before the business runs out of money.
- Writing it to convince rather than to think. The version that flatters the idea is the version that hides the problem.
Keep the Plan Alive
A plan written once and filed away is the version everybody complains about. Its value comes from comparison: once a quarter, sit down for an hour and put what happened next to what you predicted.
You are looking for the size and direction of the gap. Sales at half your forecast means the forecast was optimistic, the route to customers is not working, or the price is wrong, and each has a different fix. Sales above forecast matter too, because growth brings costs that arrive before the money does.
Turn whatever you learn into a small number of dated actions rather than a longer document. Two or three specific things for the next quarter will change more than a rewritten plan. The SMART goal builder is useful for making those concrete enough to act on.
Students running a real business as coursework face the same discipline in a smaller form, and our guide to the entrepreneurship SAE project shows how record keeping, not the idea, is what the work really rests on.
A plan lowers the risk but does not remove it. Our guide to why most small businesses fail in the first year covers the problems that turn up after trading starts, and the warning signs worth watching for.
None of this guarantees the business works. What it does is move the expensive surprises forward, into a week of thinking rather than a year of trading. That is the whole point of writing it down.