How to Read a Profit & Loss Statement (And Why It Matters for Your Business)

What Is a Profit & Loss Statement?

A profit and loss statement (also called a P&L or income statement) is a financial report that summarizes your revenue, costs, and expenses over a specific period—usually a month, quarter, or year. At the bottom, it tells you one critical number: whether your business made money or lost it.

Most business owners see their P&L once a year when filing taxes. That's a missed opportunity. When reviewed regularly, a P&L becomes a decision-making tool, not just a compliance document.

The Basic Structure of a P&L

Every P&L follows the same logic, even if the format varies:

Revenue – Cost of Goods Sold = Gross Profit

Gross Profit – Operating Expenses = Net Income

Let's break down each section.

Revenue (or Sales)

This is the money you've earned from your business activities—before any expenses come out. It may include:

If you offer multiple services or products, your P&L may break revenue into separate lines. This helps you see which offerings are actually driving your income.

What to watch for: Is revenue trending up month over month? Are you too dependent on a single income stream?

Cost of Goods Sold (COGS)

COGS represents the direct costs of delivering your product or service. For a service business, this might be subcontractor costs, materials, or labor directly tied to jobs. For a product business, it's the cost of manufacturing or purchasing inventory.

What to watch for: If COGS rises faster than revenue, your margins are shrinking. You may need to raise prices or reduce direct costs.

Gross Profit

Gross profit is what remains after subtracting COGS from revenue. It shows how efficiently you're delivering your core product or service.

Gross Profit Margin = Gross Profit ÷ Revenue × 100

A healthy gross margin varies by industry. For service businesses, 50–70% is often a good target. For product businesses, it depends heavily on the category.

What to watch for: A declining gross margin is an early warning sign. It often shows up here before it hits your bottom line.

Operating Expenses

These are the costs of running your business that aren't directly tied to production—things like:

What to watch for: Are expenses growing faster than revenue? Which expense categories are increasing month over month? Can anything be reduced without hurting growth?

Net Income (or Net Loss)

This is your bottom line—what's left after all expenses are paid. A positive number means profit. A negative number means you spent more than you earned.

But here's what many business owners miss: profit is not the same as cash in the bank. You can be profitable on paper and still have a cash flow problem. That's why a P&L should always be reviewed alongside your cash flow statement.

How to Use Your P&L to Make Better Decisions

Review It Monthly, Not Annually

Monthly reviews catch problems early. A bad month might be seasonal. Two or three in a row signals something that needs your attention.

Compare Month Over Month and Year Over Year

Look for trends, not just snapshots. Is gross margin holding? Are operating expenses creeping up? Comparisons reveal patterns that single-period reports hide.

Know Your Break-Even Point

Your P&L gives you everything you need to calculate how much revenue you need to cover all expenses. Knowing this number helps you set sales targets and plan during slow periods.

Use It for Tax Planning

Your P&L directly affects your tax liability. Understanding which expense categories can be deducted—and how timing of income and expenses affects your tax year—is a core part of proactive tax strategy.

At Tuesday Tax & Accounting Services, we review P&Ls with every client to identify tax reduction opportunities before year-end, not after.

Common P&L Mistakes Business Owners Make

What Your P&L Can't Tell You

A P&L doesn't show you:

For a complete financial picture, you need the P&L alongside your balance sheet and cash flow statement. Together, they give you the visibility to run your business with confidence.

The Tuesday Approach

At Tuesday Tax & Accounting Services, our clients have access to real-time financial statements through their client portal—including an up-to-date P&L, any time they need it. We also review key metrics with every client so you don't just see the numbers, you understand what they mean and what to do about them.

Because a P&L that sits in a folder doesn't help anyone.

Want to start using your financials as a real decision-making tool? Book a call with the Tuesday team and let's walk through your numbers together.

*This post is for informational purposes only and does not constitute legal, business, or tax advice. Each person should consult their own tax advisor with respect to matters referenced in this post.*