The income statement is a claim about performance over a period, assembled under rules that deliberately ignore when the cash moved. Read properly it is the most useful statement; read literally it is the most misleading.
12 min read · Level 3
The income statement is usually taught as the most objective of the three, and it is in fact the most authored. Revenue recognition, what counts as a cost of sale, how long an asset is assumed to last, which items are exceptional - all of these are judgements made by people who have some interest in the result, within rules that permit a range. That does not make it untrustworthy; it makes it a document with a point of view, which is a different and more useful thing to know. The reader's job is not to decide whether the numbers are true but to work out which judgements are load-bearing, because those are where an honest management team and an optimistic one produce genuinely different statements from identical facts.
The income statement - also called the profit and loss account - reports what a business earned and spent over a period of time. It runs downwards in layers: revenue at the top, then the direct cost of delivering it, then the costs of running the business, then the cost of borrowing, then tax, and finally what is left.
Each layer answers a different question, which is why the layers exist at all. Gross profit asks whether the thing being sold makes money. Operating profit asks whether the business around it makes money. Net profit asks whether anything survives the lenders and the tax authority.
The crucial property is that it is prepared on an accruals basis: revenue is recorded when it is earned and costs when they are incurred, regardless of when money changed hands. A sale made in December and paid for in March belongs to December. That convention makes the statement a better description of performance and a worse description of cash, and almost every misreading comes from forgetting which of those two it is.
Because it is the statement everyone quotes and the one that can be true and unhelpful at the same time. A business can report a record profit in a year when its bank balance collapsed, with no dishonesty anywhere - the accruals convention permits exactly that, and it happens constantly in growing companies.
And because the layers are where the story is. Two businesses with identical net profit can have completely different gross margins, which tells you whether the profit came from what they sell or from what they have not yet had to spend. The bottom line is a single number; the shape above it is the actual information.
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Northgate Tools is a small manufacturer. We will use the same company for all five lessons in this subject, so the statements can be checked against each other.
Its income statement, in dollars:
Year 1 Year 2 Revenue 3,500,000 4,200,000 Cost of goods sold 2,100,000 2,520,000 Gross profit 1,400,000 1,680,000 Selling and marketing 420,000 520,000 Administration 390,000 430,000 Depreciation and amort. 150,000 180,000 Operating profit 440,000 550,000 Interest expense 100,000 90,000 Profit before tax 340,000 460,000 Tax at 25% 85,000 115,000 Net profit 255,000 345,000
Check the layers rather than the bottom line.
Gross margin is 1,400,000 divided by 3,500,000 in Year 1, which is 40.0%, and 1,680,000 divided by 4,200,000 in Year 2, which is also 40.0%. The economics of what it sells did not change.
Operating margin went from 440,000 over 3,500,000, which is 12.6%, to 550,000 over 4,200,000, which is 13.1%. Revenue rose 20% and operating costs rose less than that, so a little more of each dollar survived to the operating line.
Net profit rose from 255,000 to 345,000 - that is 345,000 divided by 255,000, or 1.353, a 35.3% increase - on revenue growth of only 20%. Part of that is the operating improvement and part is that interest fell from 100,000 to 90,000 because some borrowing was repaid.
EBITDA - operating profit with depreciation and amortisation added back - is 590,000 in Year 1 and 730,000 in Year 2.
On this statement alone, Northgate had an excellent year. Hold that judgement; the next two lessons will show what it does not say.
The first mistake is reading only the bottom line. Net profit is the end of a chain of subtractions, and every interesting question - is the product profitable, is the overhead under control, is the debt affordable - is answered further up.
The second is treating profit as cash. The accruals convention means a sale counts before the money arrives and a purchase counts before it is paid for. Profit and cash can move in opposite directions for years.
The third is treating EBITDA as a cash figure. Adding back depreciation removes the accounting charge for wearing equipment out, but not the actual spending required to replace it. For a business that owns real machinery, EBITDA systematically flatters the amount of money available.
The fourth is comparing margins across different kinds of business without asking what sits in each line. Whether delivery staff are counted in cost of goods sold or in administration changes the gross margin dramatically without changing anything real, and the choice is not always the same between two companies.
Revenue, gross profit, operating profit, net profit. Write the margin at each layer for at least two years. The pattern of change across the layers is the story; the final number is the summary.
Gross margin is only comparable when the line above it contains comparable things. Find the accounting note that says what has been included, and do this before comparing one company's gross margin with another's.
If profit is rising faster than revenue, something in the cost base is not rising proportionally, and you want to know whether that is genuine operating leverage or a cost that has merely been deferred.
Items described as exceptional, non-recurring or adjusted are being asked to leave the reader's model of the business. Check whether the same kind of item appeared last year and the year before, because a recurring exceptional item is simply a cost.
Add depreciation and amortisation back to operating profit, then write down the actual amount the business spent on equipment that year. If spending is far above the depreciation charge, EBITDA is describing a business that does not exist.
Whenever you want to know whether a business's economics are improving or deteriorating, and as the first of the three statements to read - because it frames the questions the other two answer.
Do not use it on its own to judge whether a business can pay its bills, fund its growth, or survive a bad quarter. Those are cash questions and this statement is deliberately not about cash.
A shape that appears repeatedly in published accounts is a company that reports an adjusted profit figure excluding restructuring costs, and then reports restructuring costs in each of the following several years. Each individual year's explanation is specific and often genuinely true. Read across five years, the pattern is that restructuring is simply part of how that business operates, and the adjusted figure has been describing a company that has never existed.
Read the exceptional items across several years at once. An item that recurs is a cost, whatever the label on it says.
Where a cost sits is frequently a presentation choice rather than a fact. Delivery, customer support, hosting, warranty provisions and the salaries of people who install a product can each be defensibly placed in cost of goods sold or in operating expenses. Two companies doing near-identical work can therefore report gross margins many percentage points apart while being economically indistinguishable, and neither is doing anything improper.
Before comparing gross margins between companies, read what each one puts above the line. Cross-company margin comparisons that skip that step compare accounting policies, not businesses.
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