How to Read a Profit and Loss Statement: A Line-by-Line Worked Example for Small Business Owners

2026-10-10 · RKube Services

How to read a profit and loss statement line by line: revenue, cost of goods sold, gross margin, operating expenses and net income, with a worked Durham coffee shop example showing how a 70.1% to 67.0% margin slip costs about $4,300.

A profit and loss statement (P&L, also called an income statement) answers one question: did the business make money over a stretch of time, and where did it go? Most owners get one every month from their bookkeeper or their software and look at exactly one number, the bottom line. That's the least useful number on the page by itself. The lines above it tell you why it came out the way it did, and what to change.

This guide reads a real-looking P&L from top to bottom. The example is a small coffee shop in Durham, North Carolina, for one quarter. The numbers are invented but realistic, and every line has a short note on what it means and what to check. If you'd rather know what a bookkeeper does to produce this report each month, see our post on what a bookkeeper does each month.

The example P&L

Here is the coffee shop's statement for July through September 2026, on the accrual basis.

Now line by line.

Revenue: the top of the statement

Sales, $142,000. Everything the shop billed customers for coffee, food and merchandise during the quarter. One thing that should never be in this line is sales tax. In North Carolina the shop collects sales tax on prepared food and drinks and owes it to the state, so it's a liability on the balance sheet, not income. If your sales line jumps by roughly your local sales tax rate one month, someone probably coded the tax as revenue.

Refunds and comps, ($1,800). Remade drinks, refunds, free drinks for staff or regulars. Track this separately instead of netting it out of sales. At 1.3% it's normal. If it creeps to 3% or 4%, that's either a training problem, a point-of-sale problem, or theft, and you won't see it if it's buried.

Net revenue, $140,200. The base every percentage below is measured against. Expressing each line as a percent of net revenue is the single most useful habit for reading a P&L, because it lets you compare a slow quarter to a busy one.

Cost of goods sold: what it costs to make what you sell

Cost of goods sold (COGS) is the direct cost of the products you sold: beans, milk, pastries bought wholesale, the cup the drink goes in. It isn't rent or wages for most small businesses (some manufacturers include direct labor here, but a coffee shop usually doesn't).

Coffee, milk and syrups, $31,500 (22.5%). The biggest input. Watch this percentage more than the dollar amount. Dollars rise when sales rise. The percentage rises when prices from suppliers go up faster than your menu prices, or when waste goes up.

Pastries, $9,800 (7.0%). Pastries bought wholesale for $2.10 and sold for $4.25 carry a lower margin than a latte. If the mix shifts toward food, overall COGS percentage goes up even if nothing is wrong.

Cups and packaging, $4,900 (3.5%). Often forgotten. To-go heavy months push this up.

What to check. On an accrual P&L, COGS should match what you actually used. If you buy a big order of beans on September 28, a good bookkeeper either records the unused beans as inventory or keeps purchases steady enough that it washes out. If your COGS bounces between 28% and 38% month to month with no change in prices, inventory isn't being counted.

Gross profit: the most important number most owners skip

Gross profit, $94,000 (67.0% gross margin). Net revenue minus COGS. This is what's left to pay for everything else: people, rent, the business itself.

For this shop, the prior quarter's gross margin was 70.1%. A three-point drop on $140,200 of revenue is about $4,300 of profit gone in a quarter. Digging in, the cause was a milk price increase in July that the menu never caught up to. Nothing about the bottom line would have told you that. Gross margin did.

Every industry has a typical range. A coffee shop often runs 60% to 75%. A bookkeeping or consulting firm with no product might run 90% or more, because its COGS is small. A contractor might be at 25% to 40%. Your own trend matters more than an industry average, so compare quarter to quarter.

Operating expenses: the cost of running the place

Wages, $41,600 (29.7%) and payroll taxes, $3,400 (2.4%). Labor is usually the largest expense in a service business. Read wages and payroll taxes together: 32.1% here. Owners of sole proprietorships and LLCs taxed as partnerships should know their own draws are not in this line. A draw isn't an expense. It shows up on the balance sheet as a reduction of owner's equity. If you see your own draws listed as "wages" on a sole proprietor P&L, the profit is understated and your tax return will be wrong if it's built from that report. An S corporation is different: the owner's reasonable salary is a real wage and belongs here.

Rent, $13,500 (9.6%). Fixed. It doesn't move with sales, which is why a slow quarter hurts: the percentage climbs.

Utilities, $3,100. Partly fixed, partly variable. Espresso machines and refrigeration aren't cheap to run.

Card processing fees, $4,200 (3.0%). Many owners net these out of sales, which hides the cost. Record sales at the gross amount and fees as an expense. Then 3.0% becomes a number you can negotiate.

Insurance, repairs, marketing, software, accounting. Smaller lines. The thing to watch is drift. Software and subscriptions, at $640 a quarter here, tends to grow quietly as tools get added and never cancelled.

Depreciation, $1,750. The espresso machine, grinders and build-out cost money once, but they're used up over years. Depreciation spreads that cost across their useful life. It's a real cost of doing business, but no cash leaves the account when it's recorded. That's one reason a profitable business can still be short on cash, which we come back to below.

Total operating expenses, $73,640 (52.5%). Gross margin minus this percentage gives you the operating margin.

Operating income, other items and the bottom line

Operating income, $20,360 (14.5%). What the business earns from its actual operations, before financing costs and taxes. This is the cleanest number for comparing your business over time, or to a similar business.

Interest expense, ($620). Interest on the espresso machine loan. Only the interest is an expense. The principal payments reduce the loan balance on the balance sheet and never appear on the P&L.

Net income before tax, $19,740 (14.1%). The bottom line. For a sole proprietor or single-member LLC, this is close to the net profit that lands on Schedule C, though tax rules adjust some lines. IRS Publication 334, Tax Guide for Small Business, explains which expenses are deductible and how; business meals, for example, are generally only 50% deductible even though the full cost is on your P&L.

What the P&L doesn't show you

A P&L can say $19,740 of profit while the bank account went down. The usual reasons:

• Loan principal. The shop pays $1,900 a quarter of principal on the equipment loan. Not on the P&L.
• Owner draws. $15,000 taken out by the owner. Not on the P&L.
• New equipment. A $6,000 grinder bought in August shows up only as a small slice of depreciation.
• Timing. Accrual revenue for catering invoices that customers haven't paid yet counts as income now; the cash arrives later.

That's why the P&L is read alongside the balance sheet and a cash flow statement. IRS Publication 583, on starting a business and keeping records, is a good primer on why records are kept the way they are.

A five-minute monthly P&L routine

1. Check net revenue against your bank deposits and POS. Big gaps mean missing or double-counted sales.
2. Look at gross margin first. Compare it to last month and the same month last year. A drop of more than a point or two deserves a question.
3. Scan each expense as a percent of revenue. Look for any line that moved more than a point.
4. Read operating margin, then the bottom line. Now you know why the bottom line is what it is.
5. Write down one question for your bookkeeper. If you can't think of one, you probably skimmed.

Common questions about reading a P&L

What's the difference between cash and accrual P&Ls? A cash-basis P&L counts income when the money arrives and expenses when they're paid. Accrual counts them when they're earned or incurred. Accrual gives a truer picture of a month. Cash is simpler and is what many small businesses file taxes on.

How often should I look at mine? Monthly. Quarterly is too late to catch a margin problem like the milk price issue above.

Should my P&L match my tax return? Close, not exact. Tax rules treat some items differently, such as meals, depreciation methods, and owner health insurance. Your preparer reconciles the two.

Why is my P&L different every time I run it? Usually because transactions are still being categorized or bank feeds are behind. Ask your bookkeeper to close each month, so the report for a closed month stops changing.

Want P&Ls you can actually read?

RKube Services handles bookkeeping, tax prep and payroll for small businesses across the US and Canada, including coffee shops, contractors and service firms in Raleigh and Durham. We close your books each month and send a P&L you can read in five minutes, with the questions already flagged. Start with a free scoping call and a 30-day trial: call (984) 234-7030 or reach us through rkubeservices.com.