What is an income statement?
Short answer: An income statement reports revenue, income, costs, expenses and profit or loss for a defined period. It is also called a profit and loss statement, or, under IFRS terminology, a statement of profit or loss.
The statement measures accounting performance, not cash movement. Revenue is recognised under the applicable accounting policy when goods or services are transferred, and expenses are recognised when the relevant accounting requirements are met. Cash may be collected or paid in another period. Depreciation and amortisation allocate the recorded amount of long-lived assets over relevant periods even though the original cash payment may have occurred earlier.
How the statement works
A simplified operating structure is:
Revenue - cost of sales = gross profit
Gross profit - operating expenses = operating profit
Operating profit + finance income - finance costs - tax expense = profit after tax
Actual statements may include other income, impairment, gains or losses, results from discontinued operations, and other comprehensive income in a separate or combined presentation. Classification by nature or function can also change the visible subtotals. Users therefore need the accounting policies, notes and a consistent mapping from ledger accounts to reporting lines.
Example
A company reports 12,000 of revenue for a quarter. Materials, delivery labour and other costs classified as cost of sales total 7,200, producing gross profit of 4,800. Selling and administrative expenses are 2,650, depreciation is 350 and an impairment charge is 200. Operating profit is therefore 1,600. Finance income of 20 and interest expense of 170 produce profit before tax of 1,450. Tax expense of 350 leaves profit after tax of 1,100. During review, finance finds that 300 of services billed on the final day were not delivered until the next quarter. Removing that revenue and 60 of related cost reduces gross profit by 240 and profit before tax to 1,210. The example shows why cut-off can matter more than whether an invoice exists.
How it is analysed
Management compares actual results with budget, prior periods and operational drivers such as volume, customer mix, pricing, headcount and utilisation. A bridge should separate those drivers from changes in accounting classification or estimates. Product, segment and customer analysis can reveal concentration hidden by the total. Analysts also reconcile profit to operating cash flow and examine whether gains, credits or unusually low expenses make the current period unrepresentative.
Why it matters in financing and a sale
Lenders use earnings and interest information when assessing debt service, leverage and covenant headroom. Investors examine growth, margins and the path to sustainable profitability. Buyers use the statement as a starting point for quality-of-earnings work, then test revenue cut-off, cost completeness, related-party items, owner costs and items presented as non-recurring. A valuation based on EBITDA or another adjusted measure still needs a clear bridge to the underlying accounts.
Presentation pitfalls and qualifications
Typical errors are equating profit with cash, changing cost classifications without restating comparatives, recognising revenue from billing alone, excluding recurring costs from performance analysis and overlooking tax or impairment effects. Management accounts may use different layouts, but statutory presentation follows the applicable framework. IFRS 18 introduces new presentation and disclosure requirements from its effective date and replaces IAS 1. Local law, tax rules and securities regulation may add requirements. Material or unusual recognition questions should be reviewed with the company's accountant or auditor.