The Income Statement: Revenue, Expenses, and Profit Measurement
The income statement reports performance over a period using the accrual basis: revenues are recognized when the performance obligation is satisfied (earned), and expenses are matched to the revenues they helped generate (the matching principle). Key subtotals to know: gross profit = net sales − cost of goods sold; operating income = gross profit − operating expenses; income before tax = operating income ± other revenues/gains and expenses/losses; net income = income before tax − income tax expense.
Understand the revenue recognition steps: identify the contract, identify performance obligations, determine the transaction price, allocate it, and recognize revenue as obligations are satisfied. Know the difference between period costs (expensed as incurred, e.g., selling and administrative) and product costs (inventoried, e.g., direct materials, direct labor, manufacturing overhead). Under a perpetual inventory system, cost of goods sold is updated with each sale; under periodic, it is computed at period end.
Traps: (1) Treating a cash receipt as revenue when it is actually a liability (unearned revenue). (2) Forgetting that depreciation is an allocation of cost, not a cash outflow, and that a change in estimate is applied prospectively. (3) Misclassifying gains/losses on asset sales as operating revenue-they belong in other income. (4) Confusing gross profit with net income. (5) Ignoring that discontinued operations and extraordinary items (where applicable) are reported below income from continuing operations.
Worked example: Net sales $500,000; COGS $300,000; operating expenses $120,000; interest expense $10,000; tax rate 30%. Gross profit = $200,000. Operating income = $80,000. Income before tax = $70,000. Tax = $21,000. Net income = $49,000.