Income Statement

The story of a period

Where the balance sheet is a photograph of one date, the income statement is the movie of a period: every dollar earned and every cost incurred between two dates, usually a month, a quarter or a fiscal year. It is also called the profit and loss statement, or simply the P&L. Same document, same layers.

The layers run from the top line to the bottom line. Revenue comes first. Subtract the direct cost of what you sold and you get gross profit, the layer measured by gross margin. Subtract operating expenses (rent, admin, marketing, most wages) and you get operating profit. Subtract interest and income tax and you reach net income, the bottom line, which as a share of revenue is your net profit margin. Each layer isolates one kind of cost, so you can see where money is being made and where it leaks.

One layer deserves a note: operating expenses include depreciation, the accounting charge that spreads the cost of equipment over its useful years. It reduces profit every period even though the cash left in one lump long ago.

Accrual accounting: the rule that explains everything

The income statement follows accrual accounting, and understanding this one rule explains most of its behaviour. Revenue is recorded when it is earned, meaning when the work is done or the goods are delivered, not when the customer pays. Expenses are recorded when they are incurred, meaning when you receive the goods or services, not when you pay the bill.

The consequence surprises every new business owner eventually: you can show a profit while your bank account is empty. Invoice $50,000 of completed work in March and the March income statement shows $50,000 of revenue, even if every client pays in June. Meanwhile the cash to pay staff and rent has to come from somewhere. The unpaid invoices sit in accounts receivable, and the gap between paper profit and actual money is the domain of cash flow.

This is why the income statement and the cash flow statement routinely disagree, and why both are right. One measures economic performance: did this period's activity create value? The other measures liquidity: did the bank account grow? A healthy business needs a yes to both questions, and each statement can only answer its own.

Reading one as an owner

A single income statement tells you less than a stack of them. Trend beats level: a 6% margin improving every year is a better story than a 12% margin eroding. Put three years side by side and watch each layer. Revenue growing while gross profit shrinks means costs are outrunning prices. Operating expenses growing faster than revenue means overhead is quietly winning.

Turn the key lines into ratios of revenue, gross margin and net margin above all, so you can compare across years and against your industry even as the business grows.

Where the tax forms mirror it

The structure is not just an accounting convention: form T2125 for a sole proprietorship and the T2 return for a corporation both walk down the same revenue-minus-expenses staircase, so a clean income statement makes tax filing mostly a copying exercise.