Reading a P&L
The income statement is one page that every business speaks. Read it top to bottom — revenue down through COGS, opex, interest and tax to net income — and you can judge a company in 60 seconds.
What you'll learn
- The income statement (P&L) as a top-to-bottom story from revenue to net income
- Each line: COGS, gross profit, opex (S&M, R&D, G&A), operating income, interest, tax
- What EBIT and EBITDA mean — and what they leave out
- How to read margins to judge whether a business is healthy
Before you start
Why the P&L is ordered top to bottom
The income statement is not a random list of numbers. It tells a story in a specific direction: start with all the money the business brought in, then subtract costs in order of how directly they tie to delivering the product, and see what survives to the bottom.
Each subtraction answers a different question:
- After paying to deliver the product, what is left? → Gross profit
- After paying to run the business (sales, engineering, admin), what is left? → Operating income
- After paying lenders and the government, what is left? → Net income — the bottom line
That ordering is not arbitrary. By looking at the intermediate lines you can diagnose where money is leaking — is delivery expensive? Is the sales machine eating everything? — without having to read a thousand-page annual report.
A real SaaS P&L, line by line
Below is one year of financials for a hypothetical SaaS company (software-as-a-service — software sold by recurring subscription, like Spotify or Slack).
| Line | Amount |
|---|---|
| Revenue | $5,000,000 |
| Cost of Goods Sold (COGS) | ($1,000,000) |
| Gross Profit | $4,000,000 |
| Sales & Marketing (S&M) | ($2,200,000) |
| Research & Development (R&D) | ($1,000,000) |
| General & Administrative (G&A) | ($500,000) |
| Total Operating Expenses (Opex) | ($3,700,000) |
| Operating Income (EBIT) | $300,000 |
| Interest & Taxes | ($100,000) |
| Net Income | $200,000 |
Costs shown in parentheses are subtractions (a common accounting convention). Now let us walk each line.
Revenue
Revenue (also called sales or top line) is the total money customers paid during the year: $5,000,000. Nothing has been subtracted yet. This is the ceiling from which everything else is carved.
COGS and Gross Profit
COGS (Cost of Goods Sold) is the cost directly tied to delivering each unit of the product. For a SaaS company the main COGS items are cloud hosting fees (the servers that run the software) and customer-support salaries (the people who help users directly). Here: $1,000,000.
Subtract COGS from Revenue and you get Gross Profit — the money left after covering delivery:
$5,000,000 − $1,000,000 = $4,000,000
Gross margin is gross profit expressed as a percentage of revenue:
$4,000,000 ÷ $5,000,000 = 80%
An 80% gross margin is typical and healthy for SaaS. Delivering software to one more customer costs almost nothing (no factory, no raw materials), so most of each dollar of revenue survives past COGS. A grocery chain, by contrast, might have a gross margin of 25% because physical goods cost a lot to buy and move.
Opex — the three buckets
Opex (operating expenses) are the ongoing costs of running the business, not delivering the product. The P&L breaks opex into three standard buckets:
| Bucket | What it covers | This company |
|---|---|---|
| S&M (Sales & Marketing) | Sales team salaries, ads, events, commissions | $2,200,000 |
| R&D (Research & Development) | Engineering salaries, product development | $1,000,000 |
| G&A (General & Administrative) | Finance, HR, legal, executive salaries, office rent | $500,000 |
Total opex: $2,200,000 + $1,000,000 + $500,000 = $3,700,000.
Notice that S&M alone ($2.2M) is more than half of gross profit ($4M). This is common in early-stage SaaS — companies spend aggressively on sales to grow fast, betting that the recurring subscription revenue will pay back that investment over many years.
Operating Income (EBIT)
Operating income is what remains after paying both COGS and opex — everything the business needed to operate this year:
$4,000,000 − $3,700,000 = $300,000
Operating income is also called EBIT (Earnings Before Interest and Taxes). Analysts use EBIT to compare the operating performance of companies with different debt loads or tax situations, because it strips those out.
You will also hear EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization). Depreciation is the gradual expensing of a physical asset (e.g., a server rack losing value over time); amortization is the same idea for intangible assets (e.g., acquired software licenses). EBITDA adds those back to EBIT to get a rough proxy for the cash the business generates from operations.
Interest, Taxes, and Net Income
Interest is the cost of debt — if the company borrowed money, it pays the lender a fee each year. Taxes are what the company owes the government on its profits. Combined here: $100,000.
Subtract them from operating income to get net income (also called the bottom line or net profit):
$300,000 − $100,000 = $200,000
Net margin is net income as a percentage of revenue:
$200,000 ÷ $5,000,000 = 4%
A 4% net margin means for every dollar of revenue, the company keeps four cents as profit. That is thin. The business is profitable — which is an achievement — but almost all the gross profit gets consumed by the sales machine. Whether that is good or bad depends on strategy: if those sales dollars are buying loyal, long-term subscribers, the bet may pay off.
The waterfall at a glance
Reading margins to judge health
Two ratios do most of the work:
| Metric | Formula | This company | What it tells you |
|---|---|---|---|
| Gross margin | Gross Profit ÷ Revenue | 80% | How efficiently the product is delivered |
| Net margin | Net Income ÷ Revenue | 4% | How much profit survives everything |
The gap between 80% and 4% is the story: this business delivers software cheaply, but spends almost all the margin on sales. That is a bet on growth, not an error — but you now know to ask “is that S&M spend generating enough new subscribers to justify it?”
When comparing two companies, a higher gross margin gives more room to fund growth or weather a downturn. A higher net margin means more of every revenue dollar becomes actual profit.
Quick check
Next
Break-even and contribution margin — at what sales volume does a business stop losing money?