How to read a profit and loss statement

What the P&L tells you and what it leaves out

A P&L shows whether the business made money over a period, but it does not show when cash moved or what the business owns and owes.

The P&L is one of three core statements, alongside the balance sheet and the cash flow statement. It covers a stretch of time, not a single date. A monthly P&L tells you how March went. A yearly P&L tells you how the year went.

Remember that a P&L can be built on a cash or accrual basis. On accrual, revenue appears when earned and costs when incurred, even if money has not changed hands. That is why profit and cash can diverge, a point covered in cash flow versus profit. See also cash basis versus accrual accounting.

Walk down the page: revenue to gross profit

The top lines show what you sold, what it cost to deliver, and the gross profit left over.

Here is a simple illustrative P&L for one month.

Start at revenue, also called sales or top line. Next comes cost of goods sold, the direct cost of what you sold. Subtract it and you have gross profit. Here that is $48,000, a 60 percent gross margin. See what gross profit is for more.

Notice the layout of the example table. Each subtotal builds on the one above it, so an error near the top ripples down. If gross profit looks wrong, check whether every direct cost landed in cost of goods sold, or whether some of it was left in operating expenses.

Operating expenses and net income

Operating expenses are the costs of running the business, and what remains after them, plus interest and taxes, is net income.

Operating expenses include rent, salaries not tied directly to production, marketing, software, insurance, professional fees and utilities. Subtract them from gross profit and you get operating income, a clean view of how the core business performs before financing and taxes. The operating margin expresses it as a percentage of revenue: $10,000 over $80,000 is 12.5 percent in the example.

Below that come interest on debt, taxes and any one-time items. The final figure, net income, is the bottom line. In the example, net income is $7,000, an 8.75 percent net margin. Compare with the net profit guide.

Ratios worth calculating

Three percentages, gross margin, operating margin and net margin, reveal more than raw dollars.

Divide each profit line by revenue.

• Gross margin: gross profit divided by revenue. A falling figure suggests rising product or labor costs or lower prices.
• Operating margin: operating income divided by revenue. A falling figure with steady gross margin points to overhead growth.
• Net margin: net income divided by revenue. It captures everything, including debt costs and taxes.

What counts as good varies widely by industry, so compare yours with your own history and with peers in your trade. The good profit margin article gives context.

Compare periods and look for trends

A single P&L is a snapshot, so compare it with last month, the same month last year and your budget.

Put two or three periods side by side. Look at the dollar change and percent change for each line. Ask what moved most. Revenue up 10 percent but net income flat means costs rose as fast. Revenue flat but payroll up means you are adding overhead without growth.

Watch for seasonality, one-time items and categories that suddenly grow. Mis-categorized expenses can hide in a catch-all line such as miscellaneous. If that line is large, break it out.

Comparing to a budget is equally useful. If you planned for $38,000 of operating expenses and spent $44,000, that $6,000 variance deserves an explanation. The goal is to find whether the cause was timing, one-time, or a new habit that needs to be controlled.

Spot common red flags

Shrinking margins, expenses growing faster than sales, and large unexplained categories deserve a closer look.

Things to question when you read your P&L:

• Gross margin shrinking month after month.
• Owner pay missing, which overstates profit.
• Interest expense rising as debt grows.
• Revenue that depends on one or two customers.
• Profit on paper, yet a thin bank balance, which suggests cash is tied up in receivables or inventory.

Pair the P&L with your balance sheet and cash flow statement. If you are weighing funding, funders typically focus on bank statements, but understanding your own P&L helps you judge whether new debt would be repaid from real margin. Use loan ROI math before you apply.

Finally, check that the P&L ties out to your books and tax filings. Differences between the statements you prepare for yourself and the numbers on your tax return often come from depreciation methods or timing, and your accountant can reconcile them.