A business plan has a bad reputation: a thirty-page document nobody ever opens again. But the problem isn’t planning – it’s the format. A good business plan is a thinking tool: it forces you to answer, in black and white, who you sell to, why they would buy and whether the numbers add up. One page is enough to start; you write the full version only when someone asks for it.
First: the one-page business plan
Before you open a ten-chapter template, answer seven questions on a single page:
- Problem: what specific problem do you solve, and for whom?
- Solution: what do you offer, and how is it different from what exists?
- Customer: who exactly pays – industry, size, the person’s role?
- Path to customers: where do you reach them, and what does it cost to reach them?
- Revenue: what do you charge, at what price and how often?
- Costs: fixed monthly costs and the cost per unit sold.
- Survival number: how much sales per month covers your costs and your salary?
If you can’t answer a question, you’ve found your homework – and that is the main purpose of the plan.
The full structure, when someone asks for it
A bank, a grant call or an investor expects the classic structure: an executive summary (write it last), a description of the company and offer, market and competitor analysis, marketing and sales strategy, execution and team, a 2–3 year financial plan and appendices. The secret: this is just an expanded one-pager – every chapter answers the same question, only with evidence and numbers.
| Purpose | Recommended length | Focus |
|---|---|---|
| For yourself (thinking) | 1 page | Seven questions, fast |
| For a grant or bank | typically 10–20 pages | Clear summary + verified numbers |
| For an investor | full structure + appendices | Growth, team, financial projections |
The financial part: three calculations that matter
- Break-even: fixed costs (including your contributions and salary) divided by the margin per unit – how much you must sell to hit zero. It helps to know what cash flow is.
- Monthly cash flow: revenue and expenses month by month for the first year; paper profit doesn’t pay bills, money in the account does.
- Pessimistic scenario: what happens if sales are half of plan? If the answer is personal bankruptcy in three months, the plan needs a reserve or a different start.
The most common mistakes
- The “everyone” market: if the customer is everyone, the customer is no one. A narrow niche is an advantage, not a limitation.
- Top-down revenue (“just 1% of the market”): plan bottom-up – how many clients, at what price, from which channel. The guide on how to get your first clients helps here.
- Forgotten owner costs: your salary and contributions are a business cost, not a leftover.
- The plan as a monument: a document that isn’t updated with new data is dead in the first month.
The environment writes the plan, not just the template
A business plan comes together faster and better when you can test it on real people. At the makerSP_CE coworking space, entrepreneurs who have already survived their own numbers sit at the neighbouring desks – half an hour of coffee-table conversation saves a week of guessing, and the private office (12 m²) is ready when you first present your plan to a bank or partner. A desk from the price list is itself the first real line item in your financial plan.
Frequently asked questions
Do I even need a business plan for a sole proprietorship?
Formally no – nobody requires it at registration. In substance, though, the one-page version helps everyone: half a day of work that prevents months in the wrong direction.
How long should a business plan be?
As short as the purpose allows: one page for yourself, typically 10–20 pages with a clear summary for a grant or bank. Length is not a measure of quality – verified numbers are.
Where do I get help writing it?
Free of charge at SPOT advisory points (workshops and one-on-one help); SPIRIT programmes and business incubators are useful too. Before you pay a writer, use the public support – but write the plan yourself in any case, because the thinking is its main product.
Conclusion
A business plan isn’t a ticket into entrepreneurship but a map for it: one page with seven answers for you, the full structure when a bank or grant call requires it, and three financial calculations that tell the truth. Write the first version this week – a bad first version on paper is worth more than a perfect one in your head.
Related reading
- What Exactly Is Cash Flow and Why It Matters
- How to Get Your First Clients: 7 Channels
- How to Open a Sole Proprietorship in Slovenia in 2026
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