Learning to read a profit and loss statement is one of the most useful skills a business buyer can develop, because it shows how the company earns and spends money. A profit and loss statement, often called a P&L or income statement, summarizes revenue, costs and profit over a period. Sellers use it to present their business, and buyers must be able to question it. This guide explains the main lines, what to check and the warning signs to look for. It is educational and not accounting advice.
The basic structure
A P&L starts with revenue, subtracts the cost of goods sold to reach gross profit, subtracts operating expenses to reach operating profit and then accounts for interest, taxes and other items to reach net profit. Understanding this flow lets you see where the money goes.
Revenue
Look at how revenue is recognized and whether it includes one-time sales or unusual items. Compare monthly figures across several years to see trends and seasonality. Ask what share comes from the top customers, since a few large accounts raise risk.
Cost of goods sold and gross margin
Cost of goods sold includes direct costs such as materials, products and direct labor. Gross margin is gross profit divided by revenue. A falling margin may signal rising costs or discounting. Compare the margin with typical figures for the industry, which a broker or an accountant can help you find.
Operating expenses
Rent, wages, marketing, insurance, software, utilities and other costs appear here. Look for items that seem too low, such as owner salary or repairs. Missing costs inflate profit. Also check for expenses that may not continue after the sale.
Owner adjustments
Sellers often adjust the P&L to show what a new owner could earn, adding back the owner’s salary, personal expenses and one-time items. Ask for support for each adjustment, such as receipts or contracts. Be skeptical of large or repeated add-backs. Our post on business valuation basics explains how these adjustments affect price.
Compare with other documents
A P&L is only one piece. Compare it with tax returns, bank statements, sales tax filings and the balance sheet. If sales on the P&L do not match deposits, ask why. Ask for statements prepared by a third-party accountant where available.
Red flags
Be cautious if the P&L was prepared recently just for the sale, if months are missing, if categories change from year to year, if expenses are far below industry norms or if profit is steady in a business that should have seasonal swings. Unexplained cash transactions are another warning.
Beyond profit: cash flow
Profit is not cash. Inventory, receivables, loan payments and equipment purchases affect cash even when they do not appear as expenses. Ask for a cash flow statement or build one yourself. Our guide to financing a business opportunity shows how lenders view cash flow.
Questions to ask the seller
Take these to your next meeting:
- Who prepared these statements and how?
- What are the one-time or personal items?
- Which costs will change under new ownership?
- Why did margins change in a given year?
- Can I see monthly detail for the last three years?
A quick review routine
Follow these steps for each statement:
- Check revenue trends and customer concentration.
- Calculate gross margin each year.
- List expenses that look unusually low.
- Verify add-backs with documents.
- Compare to tax returns and bank deposits.
Key takeaways
The P&L tells a story, and your job is to test it. Read every line, check the add-backs, compare with other records and ask a professional to help on larger deals. A careful review can save you from paying for profit that is not there.
Keep a simple record
Write down every step, the advice you received and what you did with it. After a few months you can see which suggestions paid off and which did not. That record also makes your next conversation more focused, because you can start by reporting results instead of repeating background. It helps you spot patterns in your own decisions.
Review the record each quarter and note what stands out.
Practical examples in practice
Consider how applying the idea might look in a small business you could realistically own. Write down the customer you want to reach, the promise you make to them and the proof you can offer. Then compare that plan with two competitors in your area. Seeing the gaps on paper makes your next step clearer and keeps the work grounded in real decisions rather than theory.
Frequently asked questions
Do I need an accountant? For most purchases, yes. An accountant can spot issues and help you ask better questions.
What is a good profit margin? It varies widely by industry. Compare with typical figures for the same type of business.
What if the seller has no P&L? Ask for tax returns, bank statements and sales records, and treat the lack of statements as a risk to price in or a reason to walk away.
Helpful outside resources
The IRS explains recordkeeping for small businesses, and the SBA offers guidance on managing business finances.
