Fundamental analysis · Beginner

Reading an Income Statement

Profit is an opinion within a framework. Revenue timing and depreciation policy are both decisions, not observations.

Last reviewed 15 September 2026 by the MarketPro research desk · Editorial policy

In short

An income statement reports revenue, costs and profit over a period, read top to bottom as a sequence of subtractions. Revenue minus cost of goods sold gives gross profit, minus operating expenses gives operating profit, and minus interest and tax gives net profit. Compare operating profit rather than net profit across periods, because one-off items and financing costs land below the operating line.

What to remember

The gap between gross and operating margin is the whole overhead of running the business, and the part management actually controls.
Interest at 13% of operating profit means doubling it takes 15% off net profit, once the tax relief on the extra interest is counted.
Revenue timing and depreciation policy are judgements. Two companies with identical cash collections can report different profit.
Revenue growing while gross margin falls is growth bought with discounting, which reads as success in the headline and shows up later.

Lesson 8 of 24 in Fundamental analysis

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An income statement shows what a company sold over a period and what it cost to sell it. It reads top to bottom as a subtraction: revenue at the top, then costs removed in stages, with net profit at the bottom. Every ratio people quote about profitability is built from two of these lines, so reading the statement properly removes the need to trust anyone else's summary of it.

From £100 of revenue to £11 of profit

Scale a real quarter to £100 of revenue so the proportions are visible.

Line	Amount	What it tells you
Revenue	£100.00	Goods and services sold, before any cost
Cost of goods sold	(£58.00)	Direct cost of what was sold
Gross profit	£42.00	42% gross margin
Operating expenses	(£27.00)	Salaries, marketing, rent, research
Operating profit	£15.00	15% operating margin, the core business
Interest	(£2.00)	Cost of the debt on the balance sheet
Tax	(£2.60)	Roughly 20% of pre-tax profit
Net profit	£10.40	10.4% net margin, the bottom line

Two things fall out of this immediately. First, the gap between 42% gross and 15% operating is the entire overhead of running the business, and it is where management actually has discretion. Second, £2 of interest against £15 of operating profit means interest eats 13% of operating income. Double it to £4 and pre-tax profit falls to £11, tax to £2.20 and net profit to £8.80. That is 15% off the bottom line with no change whatsoever in how many units the company sold, and it is how a rate cycle reaches a share price.

The same statement also tells you how much of the cost base is fixed. If most of the £27 of operating expense is salaries and rent, it stays there whether revenue is £100 or £90, and a 10% drop in sales takes nearly 30% off operating profit, because gross profit falls to £37.80 while the £27 of overhead does not move. If most of it varies with volume, the fall is far gentler. Nothing in the statement labels which is which, but comparing operating expense across several quarters of changing revenue shows it clearly: an expense line that barely moves while revenue swings is a fixed cost pretending to be a variable one.

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The line where opinion enters the numbers

Revenue looks like a fact and is partly a judgement. Accounting rules determine when a sale can be recognised, and for a business selling multi-year contracts, software subscriptions or long construction projects, the timing is a decision made within a framework rather than an observation. Two companies with identical cash collections can report different revenue.

The other judgement line is depreciation. A machine bought for £10m and depreciated over ten years costs £1m a year. Depreciated over five, it costs £2m a year and profits are lower for five years then higher for five. Nothing about the machine changed. This is why analysts pay attention to the notes, and why comparing two companies in the same sector with different depreciation policies requires an adjustment before the comparison means anything.

One-offs, and the quarter that looked better than it was

Asset sales. Selling a building at a gain lands in profit and will not repeat. Strip it out before comparing to last year.
Restructuring charges. Genuine costs, but a company that books them every year has made them an operating expense in all but name.
Adjusted or underlying figures. Useful when they remove genuine noise, misleading when the same items are excluded year after year. Check what was adjusted out and whether it keeps recurring.
Tax items. A one-time tax credit can lift net profit sharply while operating profit is flat.

The discipline is simple. Compare operating profit, not net profit, when you want to know whether the business improved, because operating profit sits above the financing and tax lines where most one-offs land.

Three years beats one quarter

A single quarter is a snapshot with seasonality in it. A retailer's December quarter will always look better than its February quarter and it tells you nothing. Two comparisons carry real information: the same quarter a year earlier, and the trend in margin across twelve quarters.

What to look for in that trend: revenue growing while gross margin holds is healthy growth. Revenue growing while gross margin falls is growth bought with discounting. Revenue flat while operating margin rises is cost cutting, which works for a while and then runs out. Revenue and margin both falling is a business in trouble regardless of how the adjusted figures are presented.

What to pull before you form a view

Pull the last three annual figures and the last four quarters. Calculate gross, operating and net margin for each. Read the revenue line and the operating profit line as two separate series. Then look at interest cover, operating profit divided by interest expense, and note whether it is comfortably above three.

That is enough to form a view on whether the business is growing, whether the growth is profitable, and whether the debt is manageable. It is not enough to value the company, because profit is an opinion and cash is a fact, which is why the next step is the cash flow statement rather than another ratio from this one. It is also not a position: how much a view like this is worth risking is a separate decision made under the risk rules, not under the accounts.

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Written and reviewed by the MarketPro research desk

MarketPro is a trading-signal and trading-education app operated by Harajuku Holdings LTD (Cyprus). Our signal desk publishes and tracks every trade idea in-app, and every page here is checked against the app's live behaviour before publishing. Last reviewed 15 September 2026. How we produce signals and content · About MarketPro

FAQ

Reading an Income Statement: questions

What is the difference between gross profit and operating profit?

Gross profit is revenue minus the direct cost of producing what was sold, so it measures production efficiency. Operating profit subtracts the further costs of running the business, such as salaries, marketing, rent and research, so it measures whether the whole operation makes money. The gap between the two is overhead, and it is the part of the cost base management has most discretion over.

Why do companies report adjusted earnings?

Adjusted figures aim to strip out items management considers unrepresentative, such as a restructuring charge or an asset sale, so the underlying trend is visible. That is legitimate when the items genuinely do not recur. It becomes misleading when the same category of adjustment appears every year, which effectively turns a real recurring cost into something excluded by convention. Always check what was removed and how often.

Which line on an income statement matters most?

Operating profit, for most purposes. It sits above interest and tax, where financing structure and one-off items distort the figure, so it is the cleanest read on whether the core business is working. Revenue matters for growth, net profit matters for earnings per share, but the operating line is where a change in the business itself shows up first and most honestly.

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