How to Write a Simple Business Plan for a Small Business

A business plan is a short document that explains what you will sell, who will buy it, how you will reach them, and whether the money works. For most small businesses, it does not need to be dozens of pages. It needs to be clear enough that you, a partner, a lender, or a landlord can read it and understand how the business is supposed to make money.

This guide is for first-time owners, side-hustlers turning a project into a company, and anyone who has been told "bring a business plan" by a bank. By the end you will know which format to use, what goes in each section, and how to build a simple first-year forecast with numbers you can defend.

Lean plan or traditional plan

The SBA lays out two approaches. A traditional plan is comprehensive, takes longer to write, and is the format lenders and investors often request. A lean startup plan is a high-level chart that covers only the key elements and, according to the SBA, is typically one page and can take as little as an hour.

Neither format is more "real" than the other. The right choice depends on what the plan is for.

If you are unsure, start lean. A one-page plan forces decisions, and you can expand it into a longer document later if a lender asks. Some owners also write the lean version first and then lift its content into the traditional sections.

The sections of a traditional plan

The SBA's traditional outline has eight common sections. Here is what each one should do, in the order a reader expects to see them.

1. Executive summary. Two or three paragraphs: what the business is, who it serves, what you are asking for (if anything), and the headline numbers. Write this last, even though it appears first.
2. Company description. Your legal structure, location, ownership, and the problem you solve. If you have not chosen a structure yet, read Sole Proprietorship vs. LLC before you finalize this section.
3. Market analysis. Who your customers are, how many of them are reachable where you operate, and who else is already serving them. Name actual competitors and say how you differ on price, convenience, quality, or niche.
4. Organization and management. Who does what. For a one-person business, say so, and list the advisors, contractors, or part-timers you will rely on.
5. Service or product line. What you sell, how it is delivered, and what it costs you to deliver.
6. Marketing and sales. How a stranger becomes a customer: channels, pricing, promotions, and who handles selling.
7. Funding request. How much you need, what it will be spent on, and how it will be repaid or returned. Skip this section if you are self-funding, but still state your starting cash.
8. Financial projections. Covered in detail below.

The nine boxes of a lean plan

The SBA's lean format is a single grid with nine blocks: key partnerships, key activities, key resources, value proposition, customer relationships, customer segments, channels, cost structure, and revenue streams.

The two blocks people skip are the ones that matter most. Value proposition is one sentence on why a customer would pick you over doing nothing or choosing a rival. Cost structure lists what you must pay for every month whether or not you make a sale. If you can fill those two honestly, the other seven tend to follow.

Build a simple first-year forecast

The SBA advises making the first year of projections more granular, with quarterly or even monthly figures, and explaining how the numbers match any funding request. For a very small business, three statements (income, cash flow, and a starting balance sheet) are plenty.

Follow this order:

1. Estimate startup costs. Tools, equipment, deposits, licenses, initial inventory, and a first round of marketing. The SBA publishes a guide to calculating startup costs that can help you build the list.
2. Set a price and a unit of sale. Average revenue per job, per order, or per month of a subscription.
3. Forecast volume. Start from something you can observe, such as how many customers you can physically serve, not from a hoped-for market share.
4. Subtract variable costs. Materials, payment-processing fees, and anything that rises with each sale.
5. Subtract fixed costs. Insurance, software, phone, vehicle, rent.
6. Compare profit to cash. Profit on paper can still leave you short, because startup spending lands before the sales do.

Worked example

Say you plan a mobile bike-repair business. These numbers are hypothetical.

• Average job: $85.
• Variable costs (parts and supplies): 25% of revenue.
• Fixed costs: $450 a month, or $1,350 a quarter, for insurance, software, phone, and fuel.
• Startup costs: $3,000 for tools, a repair stand, starting parts stock, and signage.
• Volume: 48 jobs in the first quarter, rising to 84, then 120, then 120.

Two things stand out. First, each job leaves $63.75 after parts ($85 minus $21.25), so $450 of fixed costs is covered by 8 jobs a month. That is your break-even point before you pay yourself or set aside taxes. Second, the $3,000 startup spend exceeds Q1 profit of $1,710, so cash is about $1,290 short at the end of the first quarter unless you start with savings or borrow. That gap is exactly what the funding request should cover, with a cushion on top.

Note what the table leaves out: your own pay and income taxes. A real plan should add a line for both, which will lower the profit figures.

Make the plan useful after you write it

Add a short assumptions list at the end: your price, your volume logic, your cost estimates, and where each came from. When reality differs, you change one assumption rather than rebuild the whole thing.

Set a calendar reminder to compare actual results to the forecast every quarter. The SBA describes a plan as a roadmap for running and growing the business, and a roadmap only helps if you check it against where you actually are.

Common mistakes

• Writing for no one. A plan for a bank, a partner, and yourself will differ. Decide the reader first.
• Top-down market math. "If we capture 1% of a huge market" is not a forecast. Build from capacity and the customers you can realistically reach.
• Ignoring cash timing. Rent, inventory, and deposits are paid up front. Customers may pay late.
• Leaving out your own pay. If the business cannot support you, the plan has a hole.
• Skipping competitors. "We have no competition" usually means the research is incomplete. Customers always have an alternative, even if it is doing the task themselves.
• Padding length. Extra pages do not signal seriousness. Clear numbers and honest assumptions do.

Frequently asked questions

Do I need a business plan to start a business?

Not legally. Most businesses can launch without one. But lenders and investors commonly ask for one, and writing even a lean version tends to expose gaps in pricing and cash flow before you spend money.

How long should a business plan be?

According to the SBA, traditional plans can run dozens of pages while lean plans are typically one page. Use the shortest format that answers your reader's questions.

Should I include a five-year forecast?

If you are seeking funding, the SBA suggests a five-year forecast with income statements, balance sheets, cash flow statements, and capital expenditure budgets, with the first year in finer detail. If you are only planning for yourself, one or two years is often enough.

Where can I get free help?

The SBA's website has planning guides, and SCORE, a nonprofit mentoring network, publishes templates such as a one-year profit and loss worksheet. Check each organization's site for current mentoring options in your area.

Next steps

1. Decide who will read the plan and choose lean or traditional accordingly.
2. Fill in the value proposition and cost structure first, in one sentence and one list.
3. Build the first-year forecast in a spreadsheet, quarterly at minimum, and check where cash dips lowest.
4. Put a date on your calendar three months out to compare real results to the plan and update your assumptions.