How to Read a Profit and Loss Statement

Every year, around March, your accountant asks for your P&L statement. You open a spreadsheet, squint at it, and think: uh, what am I actually looking at?

You're not alone. Most small business owners have heard the term but were never actually taught how to read one. This guide changes that — no accounting degree required.

What Is a P&L Statement?

A Profit and Loss (P&L) statement — also called an income statement — is a report that shows your business's revenues and expenses over a specific period. Usually a month, a quarter, or a year.

The fundamental question it answers: did this business make money or lose money?

The structure is straightforward. Money comes in (revenue), money goes out (expenses), and the difference is your profit or loss. That's the whole thing. The confusing part is all the categories in between — and that's what this guide is for.

The Revenue Section: What Actually Counts

Revenue is everything your business earned from its normal operations. For a restaurant, that's food and beverage sales. For a freelance writer, that's client fees. For a salon, that's services and product sales.

What counts as revenue:

• Sales of products or services
• Commissions earned
• Rental income (if it's part of your business)
• Interest income on business accounts

What does NOT count as revenue:

• Money you put in from your personal account (that's a contribution, not revenue)
• Loans you took out (that's a liability, not revenue)
• Sales tax collected (you collect it on behalf of the government — it passes through)

A common mistake: thinking a $10,000 week means $10,000 in revenue. If $800 of that was sales tax and $1,500 was cost of materials, your actual revenue is $7,700. The P&L shows revenue, not cash in the door.

Cost of Goods Sold (COGS): The Direct Costs

Cost of Goods Sold (COGS) represents the direct costs of producing what you sell. It's the money you spent to make the revenue happen.

For product businesses

COGS includes the cost of raw materials, direct labor (workers who physically make the product), shipping to get goods to you, and any manufacturing overhead directly tied to production. If you run a bakery, your flour, sugar, and the baker's wages for time spent on production are COGS. The baker's time to clean the kitchen at the end of the day? That's an operating expense, not COGS.

For service businesses

If you're a consultant, freelancer, or agency, your COGS is often minimal or even zero — because you don't sell physical products. The cost of delivering your service is primarily your time, which doesn't get counted as a cost on the P&L (it shows up as your profit).

For service businesses with subcontractors, the fees you pay to those subcontractors do count as COGS.

Operating Expenses: The Costs of Running the Business

Operating expenses are everything else — the costs of running the business that aren't directly tied to producing a specific product or service. This is where most small businesses spend the majority of their money.

Rent and utilities

Your commercial lease (or home office deduction if you work from home), electricity, gas, water, internet — all of it. For most restaurants and retail, rent is their single largest operating expense and a key metric to track as a percentage of revenue.

Payroll and wages

Salaried employees, hourly wages, and contractor fees for roles outside your direct production (accountants, managers, HR, office admin). This usually doesn't include people counted in COGS — those workers are part of making the product, so they're in COGS, not operating expenses.

Marketing and advertising

Google Ads, Facebook ads, your website hosting, any promotional material. Track this separately so you can measure your customer acquisition cost. A good rule of thumb: if you can't tell which marketing channel brought in revenue, you're spending blind.

Insurance

General liability, professional liability (E&O), workers' comp, business property insurance. These are often overlooked on the P&L until something goes wrong. Treat insurance as a fixed cost you can't skip.

Software and subscriptions

Accounting software, CRM tools, project management platforms, email hosting. These add up fast for small businesses — and they often appear as small recurring charges that nobody flags until they're auditing the books. A $50/month tool sounds small, but five of them is $3,000 a year. The only reliable way to catch these is reviewing categorized bank statements consistently.

Net Income: The Number That Actually Matters

Net income is what remains after all expenses — COGS and operating expenses — are subtracted from revenue. It's the profit your business made.

Revenue − COGS = Gross Profit
Gross Profit − Operating Expenses = Net Income

Net income is what you pay taxes on. It's also what investors and lenders look at when evaluating your business. A business with $500,000 in revenue and $480,000 in expenses has a $20,000 net income. A business with $200,000 in revenue and $120,000 in expenses has an $80,000 net income — and it's the healthier business, despite lower revenue.

Your accountant uses net income to determine your tax liability, your banker uses it to evaluate loan applications, and you should use it to know whether you're actually building a profitable business or just running revenue in and out.

How to Use Your P&L to Make Better Business Decisions

Reading your P&L is step one. Using it is step two — and most small business owners skip it. A P&L isn't just a tax document. It's the operating dashboard for your business. Here's how to use it actively.

Pricing decisions

The most common pricing mistake small businesses make is setting prices based on what feels right, or what competitors charge, without knowing their own costs. Your P&L tells you the real story.

Start with gross margin: if your revenue is $10,000 and COGS is $4,000, your gross margin is 60%. That means every dollar of revenue leaves $0.60 to cover operating expenses and generate profit. If you need $5,000 in monthly operating expenses to run the business, you need at least $8,333 in revenue just to break even. Now you know your floor — and you can price above it deliberately instead of guessing.

When you're considering raising prices, look at the gross margin impact. A 10% price increase on a 40% margin product improves that margin to 46% — a meaningful jump in profitability without changing a single operation. The P&L makes that math visible.

Cost-cutting decisions

Not all costs cut the same way. Before you cut anything, use your P&L to separate fixed costs (rent, insurance, salaried staff — same every month) from variable costs (COGS, contract labor, usage-based software). Variable costs scale with revenue; fixed costs don't.

When revenue drops, the instinct is to cut everything. The smarter move is to cut variable costs first (they've already reduced with lower revenue) and protect fixed costs that keep the business running. If you slash a marketing budget that was directly generating revenue, you've cut costs and revenue simultaneously — and your margin stays the same while the business shrinks.

Focus cost-cutting on the operating expense lines that have grown faster than revenue. That's where inefficiency hides. A line item that was 8% of revenue two years ago and is now 14% is a problem. One that's stayed flat as a percentage of revenue is probably earning its place.

Tax preparation

Your net income on the P&L is the starting point for your tax liability. But a well-organized P&L does more than report the number — it helps you reduce it legally before year-end.

If your net income is tracking higher than expected, October is the time to act, not April. Accelerate deductible expenses into the current year (prepay subscriptions, buy equipment eligible for Section 179 expensing), maximize retirement contributions, or time a major purchase you were planning anyway. All of these show up as operating expenses on the P&L and reduce net income before taxes are calculated.

If your net income is lower than expected, the P&L helps you explain it — to your accountant, to lenders, or to yourself. A down year with documented expenses and a clean P&L is very different from a down year with no records. The documentation is what separates a tax-planning conversation from an audit.

5 Things to Look for on Every P&L Statement

Once you can read a P&L, the next skill is knowing what to hunt for. These five signals tell you more than any single number on the statement.

1. Gross profit margin

Your gross margin — revenue minus COGS, divided by revenue — is the clearest signal about the health of your core business. A 70% gross margin means you keep $0.70 of every dollar of revenue after the direct costs of delivering your product or service. The rest has to cover operating expenses and profit.

What to watch: Is the margin stable or shrinking? If you're a service business with minimal COGS, your gross margin should be 80–95%. If it's dropping, your direct costs are growing faster than revenue — suppliers are raising prices, your production costs are climbing, or you're discounting to win business without accounting for the cost of delivery.

2. Operating expense ratios

Fixed expenses as a percentage of revenue tell you how efficiently you run the business. Rent shouldn't eat more than 5–10% of revenue for most service businesses. Marketing should be deliberate and measurable. Payroll should leave room for profit.

What to watch: An operating expense line that's grown as a percentage of revenue over two or more years. One bad year is noise. Two years in a row is a trend. A line item that was 8% of revenue two years ago and is now 14% is a problem — and it usually grows silently until someone notices.

3. Month-to-month or year-over-year trends

A single P&L tells you what happened. A series of them tells you what's happening. Revenue that's up 20% year-over-year is great — but only if your expenses grew at the same rate or slower. If both grew 20%, you're running faster to stay in the same place.

What to watch: The direction of your net income over time. A business that consistently earns $20K/month net income on $100K in revenue is more valuable than one that earns $40K one month and breaks even the next three. Investors and lenders want to see consistency, not volatility.

4. One-time or non-recurring items

One-time expenses can make a period look worse than it is, and one-time revenue can make it look better. Buying a piece of equipment, a big legal fee, a settlement payment, or an unusually large marketing campaign — these don't repeat. If you're comparing periods, strip them out to see the underlying run rate.

What to watch: Line items that don't appear on other periods' statements, or amounts that are dramatically larger or smaller than your baseline. A $15,000 "Legal fees" line on a month where you had no litigation is an anomaly — note it and exclude it from your trend analysis.

5. Owner's draw or compensation

If you pay yourself from the business — a salary, draw, or distributions — that shows up somewhere on the P&L. In a sole proprietorship or partnership, it might not be labeled clearly. In an S-corp or C-corp, it's usually in payroll or distributions. If you're reading a P&L and it's not there, that's a red flag — either the owner isn't paying themselves (unsustainable) or revenue is being diverted elsewhere.

What to watch: Is owner's compensation consistent? If the business shows strong net income but the owner isn't taking distributions, that profit is sitting in the business — which may be fine for growth, but it means the P&L doesn't reflect the owner's actual take-home. For an accurate picture of your business's real profitability, factor in what you're actually paying yourself.

Real Example: A $50K-Month Consulting Firm

Let's put all of this together. Here's a realistic monthly P&L for a consulting firm with roughly $50,000 in monthly revenue.

Here's what to notice in this example:

• Gross margin is 84% — $48,800 gross profit on $58,000 revenue. That's healthy for a service business. Most of the revenue flows to profit.
• Operating expenses are 23% of revenue — $13,420 on $58,000. That's lean. The biggest line is admin payroll, not rent or software.
• Subcontractor costs are 16% of revenue — $9,200 on $58,000. That's the direct cost of delivering client work. If it rises above 20%, the margin on those engagements starts to thin.
• Net income is 61% of revenue — $35,380 on $58,000. This firm is profitable and has room to invest in growth or weather a slow month.

The key takeaway: this firm doesn't look unusual on paper. It's the ratios — gross margin %, operating expense %, net margin % — that tell the real story. A $50K business with $20K in net income is very different from a $50K business with $35K in net income, and the P&L makes that visible in seconds.