How to read a profit and loss statement.

What a P&L really is

A profit and loss statement — a P&L, also called an income statement — is a story about your money over a stretch of time: what came in, what went out, and what was left. It reads top to bottom, from every dollar of revenue at the top down to the profit at the bottom, with each layer of cost subtracted along the way.

Most owners glance at the top line and the bottom line and skip everything between. That’s where all the useful information lives. The middle of the P&L is where you find out whether your prices are right, whether your overhead is bloated, and which lever actually moves your profit.

Read the whole thing every month and it stops being a tax document you dread and becomes a dashboard you steer by. Getting a monthly P&L in your inbox is only half the value — the other half is knowing how to read the lines between the two you already look at.

The top line: revenue

Revenue is every dollar you billed for work in the period — the top of the statement and the number most owners fixate on. It matters, but on its own it tells you almost nothing about whether the business is healthy. Plenty of high-revenue contractors are quietly losing money, because revenue only measures what came in, not what it cost to earn.

If your books are set up right, revenue breaks into streams — service, new construction, change orders — so you can see where the money’s actually coming from. That split is the first real insight the P&L offers: not just how much you sold, but what you sold, which is where pricing and focus decisions start.

Read revenue as the question, not the answer. A big top line feels like success, but it only tells you how much work you moved, not how much of it was worth doing. The rest of the statement is where that question gets settled — line by line, cost by cost — until the bottom tells you what the top actually earned you.

Cost of goods and gross margin — the honest line

Below revenue sits your cost of goods sold — the direct cost of doing the work: materials, direct labor, subs, equipment on the job. Subtract it from revenue and you get gross profit, and the percentage version, gross margin, is the most honest number on the whole statement. It tells you whether the work itself makes money before overhead ever enters the picture.

Gross margin is where pricing problems show up first. If it’s thinner than it should be for your trade, your bids are too low or your job costs are running over — and no amount of cutting office expenses fixes a pricing problem. Watch this line month to month and it will warn you before the bank balance does.

This is also where labor burden hides. If your cost of goods only captures wages and skips the taxes and comp on top, gross margin looks better than it is, and every downstream number inherits the lie. Clean job costing is what makes this line trustworthy.

A healthy gross margin depends on your trade, so don’t chase someone else’s number. What matters is your own line, held steady or climbing. Read it as a percentage, not a dollar figure — a bigger job can throw off more gross dollars and still run a worse margin, which is exactly the kind of job that keeps you busy and broke. The percentage is what tells the truth about whether the work is priced to make money.

Overhead: the costs that run whether you work or not

Under gross profit come your operating expenses — overhead. Rent, office wages, insurance, software, the truck payment, marketing: the costs that keep running whether or not a single job is on the schedule. Subtract overhead from gross profit and you reach the bottom line, your net profit — what the business actually kept.

The trap here is watching overhead in dollars instead of as a share of revenue. Overhead can grow as you grow and still be healthy, as long as it’s shrinking as a percentage. If overhead is climbing faster than revenue, the business is getting heavier, and the bottom line feels it even when sales are up.

Read overhead as a percentage every month. That single habit catches creeping costs — the subscription nobody uses, the expense that crept up quietly — long before they show up as a profit problem you can’t explain.

There’s a healthy tension in this line worth naming. Cutting overhead feels productive, and sometimes it is — but you can’t shrink your way to a good business. If gross margin is thin, trimming the office phone bill won’t save you; the money is in the pricing, not the paper clips. Read overhead to catch waste, then spend most of your energy one line up, on the margin of the work itself, where the real leverage lives.

The four numbers to actually watch

You don’t need to memorize every line. Watch four: revenue, gross margin percentage, overhead as a percentage of revenue, and net profit. Those four, tracked month over month, tell you almost everything — whether sales are growing, whether the work is priced right, whether the business is getting heavier, and whether any of it reaches the bottom.

The power is in the trend, not the snapshot. One month is noise; three months is a signal. When gross margin slips two months running, you have a pricing or job-cost problem to hunt down now, not a surprise to discover at tax time when it’s too late to do anything about it.

Turning a P&L into that four-number scorecard is the jump from recording history to steering by it — and it’s the same read a lender wants. Our guide to lender-ready financials shows what a bank looks for in the exact same statement.