How to Read a P&L Statement
Kimberly Green | 2026-04-14
By Sam's List | samslist.com
A lot of founders avoid their financial statements. Not because they don't care about the numbers—but because nobody ever taught them how to read the documents that contain those numbers.
The Profit and Loss statement (also called an income statement) is the most fundamental financial document your business produces. It tells you whether your business made money over a specific period and where that money came from and went. Understanding it isn't optional.
Making decisions without your P&L is like driving without a windshield.
The Basic Structure
A P&L follows a simple flow from top to bottom: revenue comes in, costs come out, what's left is profit. Every line either adds to or subtracts from that picture.
The four main sections:
- Revenue (or Sales): Every dollar your business brought in from selling products or services. This is the top line.
- Cost of Goods Sold (COGS): The direct costs of producing what you sold—manufacturing, materials, or direct labor.
- Operating Expenses: All costs running the business that aren't directly tied to production. Rent, salaries, software, marketing, insurance.
- Net Income (or Net Profit): What's left after all costs are subtracted from revenue. This is the bottom line.
Gross Margin: The Number That Tells You If Your Business Works
Revenue minus COGS equals gross profit. Gross margin is gross profit expressed as a percentage of revenue.
Gross margin formula: (Revenue - COGS) / Revenue × 100
Example: $500,000 in revenue, $200,000 in COGS. Gross profit = $300,000. Gross margin = 60%.
This number matters more than revenue. Gross margin tells you how much money you have left to cover operating expenses and generate profit after accounting for the direct cost of your product or service.
A business with $2M in revenue and 20% gross margin has $400K to cover all operating expenses. A business with $1M in revenue and 60% gross margin has $600K. The smaller business has more room to be profitable.
Gross margin benchmarks vary by industry. Software businesses often achieve 70–90% gross margin. eCommerce typically runs 30–50%. Service businesses can range from 40–70% depending on how much direct labor is involved.
If you don't know your gross margin right now, that's the first gap to close.
Operating Expenses: Fixed vs. Variable
Operating expenses cover everything it costs to run the business beyond the direct cost of your product or service. Understanding them requires separating fixed from variable.
- Fixed expenses: Costs that stay the same regardless of revenue. Rent, base salaries, software subscriptions, insurance. These costs exist whether you have one client or one hundred.
- Variable expenses: Costs that scale with revenue or activity. Sales commissions, shipping costs, credit card processing fees, contractor costs that fluctuate with project volume.
The distinction matters because if revenue drops 20%, your variable expenses drop proportionally. Your fixed expenses don't.
Understanding your fixed cost base tells you exactly how much revenue you need to cover those costs before you generate any profit—your break-even point.
Break-even calculation: Fixed Costs ÷ Gross Margin % = Break-Even Revenue. If you have $300K in annual fixed costs and 60% gross margin, you need $500K in revenue to break even. Every dollar above that contributes to profit at a 60% rate.
EBITDA: The Operating Performance Number
EBITDA stands for Earnings Before Interest, Taxes, Depreciation, and Amortization. It's the closest thing to a pure measure of operating performance—how much money the business generates from its core operations, before financing costs and accounting adjustments.
EBITDA is the number most often used in business valuations. A business is often valued at a multiple of EBITDA—4x, 6x, 8x EBITDA, depending on industry and growth rate. If you're building toward a sale, EBITDA is the number that most directly determines your exit value.
EBITDA also helps you compare your performance against industry benchmarks because it strips out variations in capital structure and accounting decisions that can make different businesses hard to compare.
What to Actually Look for Every Month
Reading a P&L isn't just about understanding the numbers. It's about noticing what changed.
The questions to ask when you open your monthly P&L:
- Is revenue up or down vs. last month—and why? Revenue changes should be explainable. If they're not, dig until they are.
- Did gross margin change? If your gross margin dropped, either your revenue mix shifted or your COGS went up without a corresponding price increase. Both require attention.
- Are any expense lines growing faster than revenue? Expenses that grow proportionally with revenue are fine. Expenses that grow faster are eroding your profit margin. Find them early.
- Is the net income trend moving in the right direction? Month-to-month fluctuations are normal. A consistent downward trend is a problem that needs diagnosis, not hope.
- Does anything look unusual or unexplained? An expense category that's double last month, a revenue item you don't recognize, a COGS figure that doesn't match your sense of what you sold. These are questions for your bookkeeper or accountant.
Why Monthly P&L Reviews Are Non-Negotiable
Some founders look at their P&L once a quarter. Some once a year, at tax time. Both frequencies are too infrequent to catch problems before they compound.
A monthly review takes 20–30 minutes when your books are clean. It tells you whether the business is on track, whether anything unusual happened, and whether any decisions need to be made before next month.
The decisions that come from monthly reviews are different from the ones that come from annual reviews. Monthly, you catch a margin erosion in month two and adjust pricing in month three. Annually, you discover you've been underpricing for twelve months and the damage is done.
Tax season should be a formality, not a crisis. That's only possible if the financial information has been maintained and reviewed consistently throughout the year.
When Your P&L Doesn't Match Your Bank Account
This is the confusion that trips up most non-finance founders, and it's important to understand why it happens.
Profit is not the same as cash. Your P&L shows profitability on an accrual basis—revenue is recognized when earned, expenses when incurred, regardless of when cash actually moves. Your bank account shows cash on a cash basis.
The gap between them is your cash flow situation. A profitable business can have a negative cash position if customers are slow to pay or if you've made large investments in inventory or equipment. A cash-rich business can show a paper loss if it has accelerated depreciation or other non-cash accounting adjustments.
Understanding this gap is why the cash flow statement is the third essential financial document alongside the P&L and balance sheet. A good bookkeeper or accountant produces all three and explains the relationship between them.
If your bookkeeper only gives you a P&L and bank statements, ask for the cash flow statement.
Get Your Numbers in Focus
You now know what every line on your P&L means, what to look for monthly, and why your numbers matter more than your revenue figure. But knowing what to look for and having someone to explain it are two different things.
The best financial partners do both: they make sure your books are clean and your numbers are accurate, then they explain what those numbers actually mean for your business every single month.
Find a CPA Who Explains Your Financials—Not Just Files Them
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