The Short Version:
Your income statement shows whether you made money over a stretch of time, but the number at the bottom is the least useful one on the page. The percentages between the lines are what tell you where your profit comes from and where it leaks out. Gross margin, operating margin, and net margin take about two minutes to figure, and the comparison worth making is against your own numbers over time rather than an industry average.
Your P&L shows up every month. You scroll to the bottom, find the profit number, and then what?
If it's positive, good. If it's bigger than last month, better. Past that, most owners have no way to tell whether the number is any good, and no idea what to do about it if it isn't.
The bottom line is often the least useful number on your income statement by itself. By the time you're reading it, every decision that produced it has already been made. The numbers that tell you something you can still act on are sitting above it.
At Patrick Accounting, we've spent more than 20 years helping small business owners turn reports like this one into decisions. In this article, I'll walk you through how a P&L is built line by line, the three percentages worth figuring every month, and the categorization problems that can make the whole report misleading.
What an Income Statement Shows About Your Business
An income statement is a report showing your revenue, your expenses, and what's left over across a period of time.
You'll see it called three different things, and they all mean the same report: income statement, profit and loss statement, and P&L. Your accounting software might use one name while your accountant uses another. Same document.
The formula underneath it is simple:
Total Revenue (Income) – Total Expenses = Profit
The period is what separates it from your balance sheet. A balance sheet captures a single date. An income statement covers a stretch of time: a month, a quarter, a year. That's why P&Ls can be compared to each other, and that comparison is where most of the value sits.
How a P&L Is Built, Line by Line
A P&L reads top to bottom, and each line subtracts something from the one above it. Knowing what belongs on each line is most of what it takes to read one.
Revenue: What You Brought In
Revenue is the top line: everything you sold before any costs come out. It's sometimes labeled sales or income.
Two things to check here:
- Whether your revenue is broken into categories or dumped into one account. A single line that says Income tells you that money came in and nothing else. Split by service line, location, or product type, the same number starts telling you which part of the business is actually growing.
- When revenue gets recorded. On an accrual basis, it's recorded when you earn it, which may be when you invoice, but not always when the customer pays. That's why a big revenue month and a big deposit month aren't always the same month.
Cost of Goods Sold: What It Costs to Deliver
Cost of goods sold, or COGS, covers the direct costs of delivering what you sold. The test is whether the cost would exist if you hadn't made the sale.
- A restaurant: food, beverage, and the kitchen and service labor tied to serving it
- A plumbing company: parts, materials, and the technician's hours on the job
- A manufacturer: raw materials and production labor
COGS usually moves with volume. Sell more, and it usually rises too, though not always dollar for dollar. That behavior is what separates it from most of the expenses further down.
Gross Profit: What's Left to Run the Business
Gross profit is revenue minus COGS. It's the money available to cover everything else: rent, admin salaries, insurance, software, marketing, and whatever you hope to keep.
This is the line to read before any other. It's where pricing shows up, where rising supplier costs show up, and where the habit of discounting to win work shows up. A business can grow revenue every month and get into trouble anyway if gross profit isn't keeping pace.
Operating Expenses: The Cost of Keeping the Lights On
Operating expenses are the costs of running the business outside the direct cost of delivering what you sold. Rent, utilities, insurance, administrative salaries, software subscriptions, marketing, and professional fees are common examples.
Some are fixed, and some move as the business changes. But a lot of them don't scale up and down with volume the way COGS does, which is why a slow month hurts: the expenses keep arriving on schedule.
The line between COGS and operating expenses is the one that gets drawn wrong most often, and there's a section below on what happens when it is.
Net Profit: What You Actually Kept
Net profit is what remains after the expenses included on that version of your P&L. That can include interest and depreciation, and for a C-Corporation it can include income-tax expense too. This is the bottom line.
One thing it is not: cash. Net profit and your bank balance can look nothing alike. Loan principal and owner draws move money without showing up as expenses on the P&L. Inventory and equipment purchases usually do too at first, then show up later through cost of goods sold or depreciation. That gap has its own report, covered in How to Read a Cash Flow Statement.
How to Read Your Income Statement in Five Minutes
You don't need to study every line. A monthly review goes in this order:
- Check the period. Make sure you're comparing a full month to a full month. A partial period makes everything below look wrong.
- Go to gross profit before revenue. Revenue going up feels good and tells you very little on its own.
- Convert the big lines to percentages of revenue. Dollar amounts are hard to judge across months of different sizes. Percentages are comparable.
- Compare to the same month last year, not last month. Most businesses have a seasonal shape. Comparing December to November tells you about the calendar, not about the business.
- Look at the direction across three months. One month is a data point. Three months is a trend, and a trend is something you can act on.
The Three Percentages on Your P&L Worth Figuring Every Month
Turning your P&L into percentages is what makes it readable. A $40,000 gross profit means something completely different on $80,000 of revenue than on $400,000.
|
Margin |
How to figure it |
What it tells you |
What a drop usually means |
|
Gross margin |
Gross profit divided by revenue |
How much of every sales dollar remains after the direct cost of delivering the work |
Prices too low, direct costs rising, more discounting, or a change in the kind of work you sold |
|
Operating margin |
Operating profit divided by revenue |
How much of every sales dollar remains after direct costs and operating expenses |
Overhead grew faster than revenue did, gross margin slipped, or both |
|
Net margin |
Net profit divided by revenue |
What remains from each dollar after the expenses on your P&L |
A change in gross margin, operating expenses, interest, taxes, or more than one of them |
A note on industry benchmarks. You'll find tables of them all over the internet, and they're not always helpful. A restaurant benchmark averages a fast-casual counter with a fine dining room. A construction benchmark blends a two-person remodeling outfit with a commercial general contractor. Those businesses have almost nothing in common on margin, and the average describes neither one.
The comparison that tells you something is your own margin against your own margin, month over month and year over year. If gross margin ran 38 percent all last year and it's been 33 percent for three months straight, that's worth a conversation regardless of what any benchmark table says.
Why Your P&L Might Be Misleading You
Everything above assumes the report is built correctly. When a P&L gives an owner the wrong impression, it's usually one of these:
- COGS and operating expenses are mixed up. This is the big one. If direct labor that belongs in COGS sits in operating expenses, your gross margin looks better than it really is, and every pricing decision based on it starts from a misleading number.
- All revenue sits in one account. You can see that sales grew. You can't see which part of the business grew, which is the part you'd actually use.
- Owner compensation is recorded inconsistently. Salary, draws, and distributions are treated differently, and which one you use depends on your entity type. If the treatment changes partway through the year or isn't recorded consistently, your profit becomes hard to compare from one period to the next.
- Personal expenses are running through the business. Each one lowers reported profit and distorts whichever category it lands in.
- Cash and accrual are mixed. If revenue is recorded when earned or invoiced but expenses are recorded only when paid, the two sides may not be describing the same period. That can make the profit number misleading.
- There's no comparison column. A P&L showing only this month, with nothing to compare against, is a number without context. Most accounting software will add a prior-period or prior-year column in a couple of clicks.
The first one is worth checking before you do anything else, because it inflates the number you're most likely to act on. If the categories under your P&L were never set up properly, clean up the bookkeeping before drawing conclusions from the report.
How Often Should You Review Your Income Statement?
Monthly, once your books are closed and the numbers are reliable enough to use. That's the rhythm that lets you catch a margin slipping while there's still time to respond to it.
Beyond the monthly read:
- Quarterly. Compare against the same quarter last year to see past seasonality.
- Before any pricing change. Know your current gross margin before you decide what a new price should be
- Before adding overhead. A new hire or a bigger space shows up in operating expenses every month from then on.
That rhythm only works if the reports arrive in time to use. When financial reports aren't helping owners make decisions, it's usually a timing or data problem rather than a comprehension problem.
What to Do With What Your Income Statement Tells You
The P&L is the report most owners already open, and the one most of them read the least carefully. It doesn't take an accounting background to get real information out of it: check the period, read gross profit first, turn the big lines into percentages, and compare against the same month a year ago.
The question that brought you here, whether the number at the bottom is any good, isn't answered by the number at the bottom. It's answered by the percentages above it and by how they've moved over the last several months.
At Patrick Accounting, we've spent more than 20 years helping small business owners in Memphis and across the country read reports like this one and do something with what they find.
If you want a short list of what to watch alongside your margins, start with Are You Even Winning? Track These 5 Numbers to Know for Sure. And if your margins look fine while your bank account doesn't, the gap is explained in How to Read a Cash Flow Statement.
Want someone to go through your numbers with you, including whether your P&L is categorized correctly in the first place?
Frequently Asked Questions About Income Statements
What does an income statement show?
Revenue, expenses, and profit across a period of time, whether that's a month, a quarter, or a year. It does not show what you own or owe, which is the balance sheet, and it does not show actual cash movement, which is the cash flow statement.
Is an income statement the same as a P&L?
Yes. Income statement, profit and loss statement, and P&L all refer to the same report. The name varies by software and by accountant.
What's the difference between gross profit and net profit?
Gross profit is revenue minus the direct cost of delivering what you sold. Net profit is what's left after operating expenses and the other expenses included on your P&L come out too. Gross profit helps show whether your pricing and direct costs are working together. Net profit shows what remained after the period's reported expenses.
What belongs in COGS versus operating expenses?
A useful rule is this: If the cost is directly tied to delivering what you sold, it often belongs in COGS. Materials, direct labor, and subcontractors on a job are common examples. Costs you would usually pay whether you sold anything that month, like rent, insurance, and administrative salaries, typically belong in operating expenses. The important part is using a consistent method that fits how your business actually works.
Why does my P&L show a profit when I have no money in the bank?
Because profit and cash are different measurements. Loan principal payments and owner draws affect cash without showing up as expenses on your P&L. Inventory and equipment purchases often affect cash first, then show up later through cost of goods sold or depreciation. And customers who haven't paid yet can make profit look better than the bank balance. Your cash flow statement helps explain the difference.
This article is part of our series on reading your financial statements:
