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Intermediate/Financial Statement Analysis/Lesson 34 of 60

Reading an Income (P&L) Statement

Understanding revenue, expenses, and profit to see how a company makes money.

Why it matters

The profit and loss statement, also called the income statement, is where a company sets out the money it brought in, the costs it took out, and the profit it kept over a set period such as a quarter or a full year. A balance sheet is a photo taken at one instant. The P&L is the video of the whole year, showing how the money actually moved.

A price chart tells you what the market is feeling. The P&L tells you what the business actually did. Read it well and you can see whether sales are growing, whether costs are under control, and how much of each rupee of sales survives all the way to the bottom line. Almost every other number an investor uses, earnings per share, margins, the P/E ratio, is built from figures on this one statement.

The whole statement in one line:
Revenue - Expenses = Profit (or loss)

An everyday way to picture it

Picture your own month. Your salary lands first. Then costs come out in a set order: the essentials you cannot skip, then the smaller running costs, then the loan EMI, then the income tax the government takes. Whatever survives all of that is your saving. A company P&L reads from the top down in exactly that order, and the profit is simply what is left at the bottom.

Your monthA company P&L
Salary that arrivesRevenue (sales)
Groceries and raw essentialsCost of goods sold
Rent, bills, travel, subscriptionsOperating expenses
Loan EMIInterest
Income taxTax
What you saveNet profit

If your salary rises while your spending holds steady, your saving grows. The same logic decides whether a company keeps more of every rupee it earns. The order matters too: a cost taken out near the top, like the raw materials, hurts far more than a small expense near the bottom.

The waterfall, line by line

Revenue starts at the top, and each layer of cost is taken out in turn. Three checkpoints along the way, gross profit, operating profit, and net profit, each answer a different question about the business. Here is the full waterfall for Sunrise Foods, our worked example throughout these lessons.

ParticularsAmount (₹ crore)
Revenue (sales)2,000
Less: Cost of goods sold1,200
Gross profit800
Less: Operating expenses500
Operating profit (EBIT)300
Less: Interest30
Less: Tax70
Net profit200

Each checkpoint becomes a margin once you divide it by revenue. A margin is just the share of every ₹100 of sales that survives to that point, which lets you compare a small company with a giant on equal terms.

Gross margin (the direct cost of the product):
Gross Profit ÷ Revenue × 100 = 800 ÷ 2000 × 100 = 40%
Operating margin (the cost of running the whole business):
Operating Profit ÷ Revenue × 100 = 300 ÷ 2000 × 100 = 15%
Net margin (what is left for shareholders):
Net Profit ÷ Revenue × 100 = 200 ÷ 2000 × 100 = 10%

The gross margin shows how cheaply the company can make what it sells. A wide gross margin usually signals pricing power or a low-cost product. The operating margin is the cleanest read on the core business, because it strips out how the company is financed and how it is taxed. The net margin is the final slice that belongs to owners, after interest and tax are paid.

Why operating profit can matter more than the bottom line

Two companies can report the same net profit while one carries no debt and the other is buried in interest payments. Operating profit, or EBIT, judges the core business on its own, before loans and tax enter the picture. If a company has a strong operating profit but a thin net profit, the problem is usually the balance sheet, too much debt, rather than the product itself.

Read the quality of the profit, not just the size
  • Recurring beats one-off. Profit from selling more product, year after year, is what you are really buying. A jump from selling a building or a tax refund is a one-off that will not repeat.
  • Watch the "other income" line. If most of the profit comes from outside the main business, the headline number is flattering a weaker operation.
  • Margins tell the trend. Rising sales with falling margins means costs are winning. That is worth more attention than the size of the profit in any single year.

See it for yourself

Move each cost and watch it flow down to net profit and the three margins. The sliders start where Sunrise sits, so net profit lands at 200 crore and EPS at 20.

Revenue₹2,000 crore
Cost of goods sold₹1,200 crore
Operating expenses₹500 crore
Interest₹30 crore
Tax₹70 crore
ParticularsAmount
Revenue₹2,000 crore
Less: Cost of goods sold₹1,200 crore
Gross profit₹800 crore
Less: Operating expenses₹500 crore
Operating profit (EBIT)₹300 crore
Less: Interest and tax₹100 crore
Net profit₹200 crore
Net margin
10.0%
EPS at 10 crore shares
₹20.0
Gross margin 40.0%, operating margin 15.0%, net margin 10.0%. A net margin of 10.0% means about ₹10 of profit for every ₹100 of sales.

Squeeze the margins

Hold revenue steady and push the two big cost lines up or down. Watch how quickly the margins move.

Revenue₹2,000 crore
Cost of goods sold₹1,200 crore
Operating expenses₹500 crore
Gross margin
40.0%
Operating margin
15.0%
A small rise in the cost of goods sold pulls both margins down at once, because every rupee of extra cost comes straight out of profit. That is why steady margins are a sign of a business in control of its costs.

Trace the three-year trend

One year tells you little. A run of years tells you whether sales and profit are really growing. These start with Sunrise's own three-year record.

Year 1 revenue₹1,600 crore
Year 1 net profit₹150 crore
Year 2 revenue₹1,790 crore
Year 2 net profit₹175 crore
Year 3 revenue₹2,000 crore
Year 3 net profit₹200 crore
YearRevenueNet profit
Year 1₹1,600 crore₹150 crore
Year 2₹1,790 crore₹175 crore
Year 3₹2,000 crore₹200 crore
StepRevenue growthProfit growth
Year 1 to Year 211.9%16.7%
Year 2 to Year 311.7%14.3%
When profit grows faster than revenue, margins are widening, which is the mark of a business getting more efficient as it grows. When profit lags revenue, costs are eating the gains.

Worked example: Sunrise Foods

Sunrise Foods makes packaged snacks and staples sold across India. It is a steady, profitable consumer brand, the kind of business a beginner can reason about without specialist knowledge.

Last year Sunrise sold ₹2,000 crore of packaged food. Follow each rupee down the statement and you arrive at the net profit, and from there at earnings per share.

StepWorkingResult
RevenueTotal sales for the year₹2,000 crore
Gross profit₹2,000 crore - ₹1,200 crore COGS₹800 crore (40%)
Operating profit (EBIT)₹800 crore - ₹500 crore opex₹300 crore (15%)
Net profit₹300 crore - ₹30 crore interest - ₹70 crore tax₹200 crore (10%)
EPS₹200 crore ÷ 10 crore shares₹20 per share

So out of every ₹100 of sales, Sunrise keeps ₹10 as net profit, and that ₹200 crore divided by its 10 crore shares gives EPS of 20. This is the same EPS the P/E lesson uses to value the stock at a price of ₹500.

Now you decide. You run Sunrise, a key supplier raises prices, and your cost of goods sold rises by 10 percent, from ₹1,200 crore to ₹1,320 crore. You choose not to pass the increase on to shoppers. Here is what the statement does in response.

LineBefore (₹ crore)After a 10% cost rise (₹ crore)
Revenue2,0002,000
Gross profit800680
Operating profit (EBIT)300180
Net profit200about 110
EPS (₹)20about 11

The selling price never changed, yet net profit nearly halved and EPS fell from ₹20 to about ₹11. That is operating leverage running in reverse: when margins are thin, a small move in costs swings the bottom line hard. It is the single best reason to watch margins, not just the size of the profit.

Spot the red flag

Three patterns that show up in real income statements. Read each one and decide what it is telling you.

Sales up 20 percent, but net profit down 10 percent

What does this most likely mean?

Remember this

CheckpointWhat it measuresHow to read it
RevenueTotal sales for the periodGrowing year after year shows real demand.
Gross profitSales minus the direct cost of the productA wide gross margin signals pricing power.
Operating profit (EBIT)Profit from the core business, before interest and taxThe cleanest read on the operation itself.
Net profitWhat is left for shareholdersCheck it is recurring, not a one-off gain.
MarginsEach profit divided by revenueFalling margins matter more than a single good year.

In short: the P&L is the story of how a company earns, spends, and keeps money. Follow revenue down to net profit, watch the three margins, and prize profit that is recurring and growing over a number that just happens to look big this year.