The income statement — also called the profit and loss statement — tells you whether a business made money over a period. It is the first document every investor and business owner should learn to read. Here is how it works, line by line.
What Is an Income Statement?
It summarises revenues, costs and expenses over a month, quarter or year, ending with net income (profit or loss). Unlike the balance sheet (a snapshot of assets and liabilities), the income statement covers a period of activity.
Key Components
- Revenue: money earned from sales or services.
- Cost of Goods Sold (COGS): direct costs of what was sold.
- Gross Profit: revenue minus COGS.
- Operating Expenses: rent, salaries, marketing, admin.
- Operating Income: gross profit minus operating expenses.
- Other income/expenses: interest, tax, one-offs.
- Net Income: the final profit (or loss).
Why It Matters
Profitability (is revenue covering costs?), margins (is the business efficient?) and earnings quality (are profits real cash?) all show up here. Survival depends on a positive net income over time.
Income Statement vs Balance Sheet vs Cash Flow
The income statement shows performance, the balance sheet shows financial position at a date, and the cash flow statement shows actual cash moving in and out. All three are needed for a full picture.
Common Misconceptions
Profit is not the same as cash in hand — you can be profitable on paper yet short on cash. Large one-off items can distort a single period, so compare several periods.
FAQ
What is the difference between gross and net profit?
Gross profit subtracts only direct costs; net profit subtracts all expenses, interest and tax.
How often do companies prepare income statements?
Quarterly and annually for reporting; many small businesses review them monthly.
Related: Capital Budgeting and Cost of Capital: Debt vs Equity.