How to Write a Business Plan for a Startup: What to Include and What to Skip
- Simon. P
- Jun 20
- 5 min read
A business plan is not a 40-page document nobody reads. The best one is the shortest one that answers every important question about the business — and you can build it in a day if you know what those questions are.
The traditional business plan has a reputation problem, and it deserves it.
The 40-page document, with its market analysis appendices and five-year financial projections and lengthy executive summary, was designed for a different era of business lending. Banks wanted comprehensive documentation. Investors wanted detailed plans. The document became the standard.
That standard has not aged well.
Investors today, particularly in the startup space, are not reading 40-page plans.
They are reading two-page summaries, 10-slide decks and the first paragraph of an executive summary. They are making initial judgements in minutes, not days. A 40-page plan does not signal thoroughness. It signals that the founder does not yet understand what matters.
The startup business plan that works in 2026 is lean, specific and honest. It answers the questions that matter and skips everything that does not. Here is how to build one.
The Six Sections That Actually Matter
Section 1 — The Problem
What problem are you solving? Whose problem is it? How frequently do they experience it? What does it cost them; in time, money, frustration or missed opportunity?
The best problem statements are specific and grounded in evidence. Not "small businesses struggle with project management" but "solo consultants lose an average of six hours per week managing client deliverables across email, Notion and WhatsApp — and miss deadlines 40% more often than they would with a dedicated system."
Specificity is credibility. Vagueness is a warning sign.
Section 2 — The Solution
What does your product or service do? How does it solve the problem? Why is it better than the alternatives your target customer currently uses?
Do not describe features. Describe the outcome. The customer does not care about your feature list. They care about what changes for them when they use your product.
Keep this section tight; two or three sentences maximum. If you cannot explain your solution clearly in two sentences, the solution is not yet clear enough.
Section 3 — The Market
How large is the opportunity? Who are the customers? How many of them are there?
Use the TAM / SAM / SOM framework:
TAM (Total Addressable Market): The total global market for your category
SAM (Serviceable Addressable Market): The segment you can realistically serve with your current model
SOM (Serviceable Obtainable Market): The portion of the SAM you can realistically capture in the next three years
Investors are most interested in SAM and SOM, not the headline TAM number that every startup inflates. Show that you understand your realistic market and how you will capture it.
Section 4 — The Business Model
How do you make money? What do customers pay? How often? What are the unit economics?
This section should answer:
Revenue model — subscription, transaction, service, licensing or other
Pricing — what customers pay and at what tier or volume
Unit economics — CAC, LTV and the ratio between them
Path to profitability — at what revenue level does the business become self-sustaining?
Be honest. Investors have seen every optimistic model. A conservative model that holds up under questioning is significantly more persuasive than an ambitious model that falls apart when challenged.
Section 5 — Traction
What evidence do you have that this is working?
Traction is the most persuasive section of any business plan. Revenue. Customers. Growth rate. Retention. Letters of intent. Waitlist numbers. Partnership agreements. Any evidence that real people have responded to what you are building.
If you have no traction yet, say so — and explain why the validation work you have done gives you confidence that traction is coming. Omitting this section entirely reads as dishonest.
Section 6 — The Team
Who is building this — and why are you the right people to build it?
Investors back people as much as ideas. The team section should convey relevant experience, complementary skills and genuine commitment. One paragraph per key person, focus on what is directly relevant to this business, not a full career summary.
If there are gaps in the team, acknowledge them and explain how you will fill them.
What to Leave Out
The sections above are what matters. Everything else is filler that dilutes the document and signals that the founder has not yet identified what is important.
Leave out:
Lengthy market research appendices
Detailed operational plans for years three to five
Extensive competitor analysis with feature comparison tables
Biographical sections unrelated to the business
Financial projections that extend beyond 18 months (they are speculation)
Mission and vision statements that could apply to any business
A tight, honest, specific plan that covers the six sections above will get more attention, and more respect, than a comprehensive document that buries the important information in detail.
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Frequently Asked Questions
Do I need a business plan to start a startup?
Not in the traditional sense. You need clarity on the six sections above — problem, solution, market, model, traction and team. Whether that lives in a formal document, a lean canvas or a pitch deck is secondary. The thinking matters more than the format.
How long should a startup business plan be?
As short as possible while covering the six essential sections. One to two pages for a lean plan. Up to ten pages if you need more space to cover the financials and market analysis properly. Anything longer than that is usually padding.
What is the difference between a business plan and a pitch deck?
A business plan is a written document — more detailed, suitable for investors and lenders who want to read in depth. A pitch deck is a visual presentation — typically 10 to 12 slides, designed to be walked through in a meeting. Most investors want the pitch deck first. The business plan comes after initial interest is established.
Do Australian investors require a specific format?
No standard format is universally required. Australian investors — particularly angels and VCs — typically prefer the lean format. Government grant applications (like EMDG or Accelerating Commercialisation) may have specific requirements. Check the specific requirements before applying.
What financial projections should I include?
A 12-month detailed forecast — month by month — and a 24 to 36-month high-level projection. Be conservative. Show your assumptions clearly. Investors are not looking for impressive numbers — they are looking for sound reasoning.
Stop Guessing. Start Building.
A business plan that answers the six questions that matter — clearly, specifically and honestly — is more persuasive than any document ten times its length. Build it in a day. Get back to building the business.
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