How to write a business plan: step-by-step guide with example

Before you open a blank page, ask who will read the thing. A bank? A public agency like Invitalia? An investor who’ll skim a deck first? Or you, six months from now, trying to remember why this seemed like a good idea? The answer decides how long the plan is and what goes in it.

This guide shows how to write a business plan in 2026: what it’s for, nine sections and the question each must answer, a one-page version, what Invitalia’s Smart&Start form really asks for, and an invented example with real arithmetic. It follows how much money it takes to start a startup on our beginner’s map from zero to a first round, because the last page of any plan is a number you can only estimate after that homework.

What is a business plan, and who reads it in 2026?

A business plan is a written answer to five plain questions. What will you sell? To whom? Why will they pick you? How will you make money? How much cash do you need before it works? Everything else is detail.

What changes is the reader. In Italy the clearest requirement comes with public money: to apply for Smart&Start Italia, Invitalia’s zero-interest loan for innovative startups, you write your plan online, section by section (more on that below). In the US, the Small Business Administration says lenders and investors commonly ask for a traditional plan. Venture investors usually start shorter. Sequoia’s guide, titled Writing a Business Plan, is a ten-point outline (purpose, problem, solution, why now, market, competition, business model, team, financials, vision) closer to a pitch deck than to a binder, and DocSend says investors spend under three minutes on a deck on average.

And there’s the reader nobody mentions: you. The holes show up while you write. Try the market section: it stays blank until you can name ten customers.

How to write a business plan: the nine sections

Templates differ in names, not in substance. These are the nine sections we’d use, with the question each must answer. Write the executive summary last.

1. Executive summary. One page. If the reader stops here, they should know what you sell, to whom, why you can do it and how much money you need.
2. Problem and solution. Who has the problem? What do they do about it today, even if it’s ugly? Then what you offer, and the proof: interviews, a pilot, a first sale.
3. Market and customers. Name your first customers, then count them from the bottom up. “Italian SMEs” isn’t a customer, but a physiotherapy clinic with 3 to 10 therapists is one.
4. Competition. Count the free options too. A spreadsheet, WhatsApp, doing nothing. Why would a physiotherapist drop the paper diary for your software?
5. Business model. Who pays you, and is it monthly or one-off? What does a customer cost to win, and then to serve? That’s where unit economics live.
6. Go-to-market. Picture your first 100 customers. How did each find you, what did that cost, and who closed the sale? Your answers are the go-to-market plan.
7. Team. Who does what? What has each person already done that matters here? And the awkward one: which seat is still empty?
8. Financial plan. Revenue is customers × price. Subtract the costs month by month and you can read off break-even and cash flow. Our guide to the startup financial model builds it properly.
9. Funding need. One number, with its reasons: how many months it covers, what it pays for and which milestone it buys.

An executive summary to copy the shape of

An invented one, for the startup we use across our guides (booking software for physiotherapy clinics). Everything in it is made up.

“[Name] sells booking software to private physiotherapy clinics in Italy. Every patient who doesn’t show up leaves a 45-minute slot nobody can sell twice, and the clinics we spoke to still confirm by phone. Our software texts the patient and offers cancelled slots to a waiting list. Clinics pay €120 a month; twelve in Lombardy are on paid pilots. Marco ran operations at a 14-clinic group for six years, Giulia built that group’s booking system. We need €230,000 to reach 190 paying clinics and break-even in month 19.”

Notice what’s missing: adjectives, “innovative”, a market figure copied from a report. A stranger can say what, for whom, why these people and how much money in under a minute. If page one can’t do that, the other eight sections won’t rescue it.

Can a business plan fit on one page? The Lean Canvas

Yes, and you should write that page first. The best-known version is the Lean Canvas. Ash Maurya came up with it in 2010 by adapting Alexander Osterwalder’s Business Model Canvas for startups working, in his words, under “conditions of extreme uncertainty”. The US Small Business Administration has a lean plan in the same spirit. It takes as little as an hour, typically fills one page, and suits a business you expect to keep changing.

Box	The question to answer
Customer segments	Who has the problem, and who will pay?
Problem	What are the top three problems these customers face?
Existing alternatives	How do they cope today, including free tools and doing nothing?
Early adopters	Who is desperate enough to try you first?
Unique value proposition	What single message would make them choose you?
Solution	Which three features solve the top three problems?
Channels	How will you reach them?
Revenue streams	Who pays, how much, how often?
Cost structure	What are your fixed and variable costs?
Key metrics	Which numbers tell you it’s working?
Unfair advantage	What can’t a rival copy or buy quickly?

Give it one hour. Every box you can’t answer is your next experiment, and our guide to validating a startup idea without spending money shows how to turn blanks into interviews.

What does Invitalia expect in a business plan?

For Smart&Start Italia, the plan isn’t a free-form document: you fill it in online, from your personal area. Invitalia publishes a facsimile of the form (Schema Domanda) so you can read every field before you start. If the company isn’t incorporated yet, the form opens with an executive summary (company, product or service, market). Then come market analysis, value proposition, channels, customer relationships, key resources, key activities (with a Gantt chart), key partners, cost structure and revenue model. Sound familiar? The headings read a lot like the Business Model Canvas.

Then the numbers: sources and uses (Fonti/Impieghi) over two years, a reclassified income statement and a cash-flow statement over four, a sales forecast over four, and a note on working capital. Most boxes have a character limit, from 1,500 to 4,000.

Two cautions. The programme is for innovative plans with eligible spending between €100,000 and €1.5 million, and applications are examined within 60 days. The facsimile is older than the platform: it was filed on Invitalia’s site in February 2025, and the platform changed in November 2025. So check every field against the live form. Our Smart&Start Italia guide explains who qualifies.

Other schemes work differently. For Resto al Sud 2.0, Invitalia’s FAQ says you needn’t attach technical documents such as expense quotes when you apply. Don’t write thirty pages for a form that doesn’t ask for them: read each scheme’s forms first, and our guide to grants for founders under 35 for who qualifies.

How do you write the financial plan? Three numbers

Forget the 40-tab spreadsheet for now. A first financial plan answers three questions. When do sales cover costs (break-even)? How low does your cash go before then? And so how much must you raise?

Take the invented clinic-software startup. Each clinic pays €120 a month and leaves €96 once hosting, payment fees and support are paid. Now the fixed costs: three people, tools, an accountant and some marketing, €18,000 a month in all. So break-even sits at €18,000 ÷ €96, which is 188 clinics. And let’s say the startup signs 10 net new clinics every month.

Month	Paying clinics	Result that month	Cumulative cash result
6	60	−€12,240	−€87,840
12	120	−€6,480	−€141,120
18	180	−€720	−€159,840
19	190	+€240	−€159,600
24	240	+€5,040	−€144,000

The lowest point is month 18, at −€159,840. Add €12,000 of one-off costs (company setup, laptops, legal) and a cushion for what you got wrong, here three months of fixed costs (€54,000), and the funding need is €225,840. Round it to €230,000: that’s the number in the executive summary. Read the other way, it’s the money that must last until month 19, your runway.

A caution: this toy plan lumps selling costs into the fixed costs and assumes no clinic ever leaves. A plan for a lender or an investor needs both, because acquisition cost and churn change the answer. Invitalia’s form has a sources and uses table: where the money comes from, and what you’ll spend it on.

Business plan mistakes that get a plan ignored

• Forty pages when the reader wants four. Settle the reader and the page count before any heading.
• A market sized from the top down. “1% of a huge market” proves nothing. Count customers you can name and multiply by your price.
• Revenue with no drivers. A hockey stick that exists because someone typed +30% in every cell. Build it from customers × price.
• “We have no competitors.” You always do: a spreadsheet, a phone call, the habit of doing nothing.
• Forgetting what a hire costs. In Italy an employee costs more than the salary on the contract, because contributions and TFR come on top.
• Writing it once. The SBA suggests a lean plan for a business you expect to change. Date every version and update it when an assumption breaks.

Your business plan checklist

1. Put the reader’s name at the top of a page (banker, Invitalia, investor), and under it what you want them to do next.
2. One sitting, one Lean Canvas. Flag each box you can’t back with evidence.
3. Talk to ten potential customers. Only then write the market section.
4. Write the nine sections, executive summary last. Every claim gets a number or a source, or it goes.
5. Build revenue from customers × price, then work out break-even, the lowest point of your cash and the funding need.
6. Trim the plan to the length your reader asked for. For Invitalia, open the live form and check the character limit of each box.
7. Hand it to a friend from another field and ask for the plan back in two minutes, in their words. Whatever they get wrong is what you fix.

Next on the map is the hardest edit of all, the whole plan in one sentence, which is what our guide to writing your startup in one line is for. Once the plan holds together, the structure of a pitch deck shows how to turn it into slides. Then our guide to raising capital for a startup in Italy puts the rest of the round in order.

This article is general information, not legal or tax advice. Rules change: check the official call or ask a professional before you apply.