How to Read an Income Statement: Revenue, Expenses, and Net Income

What Is an Income Statement?

An income statement—also called a profit and loss statement (P&L) or statement of operations—is one of the three core financial statements that public companies are required to publish. It summarizes a company's revenues, costs, and expenses over a specific accounting period, typically a quarter or fiscal year. The result is the company's net income (profit) or net loss for that period.

Alongside the balance sheet (a snapshot of assets and liabilities) and the cash flow statement (showing actual cash movements), the income statement is essential for evaluating a company's financial health and profitability trends. Understanding how to read it is a foundational skill for investors, business analysts, and finance professionals.

The Structure of an Income Statement

A standard income statement flows from top to bottom, beginning with revenue and subtracting various categories of costs and expenses to arrive at net income. The sections, in order, are:

Revenue (Net Sales)
Cost of Goods Sold (COGS)
Gross Profit
Operating Expenses (SG&A, R&D, Depreciation)
Operating Income (EBIT)
Interest Expense and Non-Operating Items
Income Before Tax (EBT)
Income Tax Expense
Net Income

Revenue

Revenue (also called net sales or turnover) is the total amount of money a company earned from its core business activities during the period. For a retailer, this is the value of goods sold. For a software company, it may include subscription fees, licensing fees, and service contracts.

Revenue is reported net of returns, allowances, and discounts. A company may report "gross revenue" before these deductions and "net revenue" after. The distinction matters because a company with high return rates may have artificially inflated gross revenue figures.

Cost of Goods Sold (COGS)

COGS represents the direct costs of producing or acquiring the goods or services a company sells. For a manufacturer, COGS includes raw materials, direct labor, and manufacturing overhead. For a retailer, it includes the wholesale cost of inventory. For a software company, COGS may include server costs and customer support.

COGS does not include indirect costs such as marketing, administrative salaries, or research and development—those appear further down the statement as operating expenses.

Gross Profit and Gross Margin

Gross Profit = Revenue − COGS

Gross Margin = Gross Profit / Revenue × 100

Gross profit measures how efficiently a company produces its goods or delivers its services. Gross margin—expressed as a percentage—varies significantly by industry. Software companies often achieve gross margins above 70–80%, while grocery retailers may operate on margins of 20–30%.

Operating Expenses

Operating expenses (OpEx) are the costs of running the business beyond direct production costs. Common categories include:

Selling, General & Administrative (SG&A): Includes salaries, rent, utilities, marketing, and corporate overhead.
Research & Development (R&D): Reported separately by technology and pharmaceutical companies investing in innovation.
Depreciation and Amortization (D&A): Non-cash charges that spread the cost of long-term assets over their useful lives.

Operating Income (EBIT)

Operating Income = Gross Profit − Operating Expenses

Also called Earnings Before Interest and Taxes (EBIT), operating income shows how much profit the company generates from its core business operations, before the effects of its financing choices (interest expense) and tax obligations. It is a useful metric for comparing companies within the same industry regardless of their capital structures.

EBITDA

EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) is widely used by analysts and investors as a proxy for operating cash flow. It adds back depreciation and amortization (non-cash charges) to EBIT:

EBITDA = EBIT + Depreciation + Amortization

EBITDA is popular in valuation because it facilitates comparisons across companies with different depreciation policies and capital structures. However, it has critics: Warren Buffett famously criticized EBITDA as misleading because it excludes real economic costs, particularly capital expenditures required to maintain business assets.

Non-Operating Items

Below operating income, the income statement includes items not related to core business operations:

Interest expense: Cost of borrowing, relevant for companies carrying debt.
Interest income: Earned on cash and short-term investments.
Gains/losses on asset sales: Profits or losses from selling property or subsidiaries.
Foreign currency gains/losses: Impact of exchange rate movements on multinational companies.

Net Income

Net Income = Revenue − All Expenses − Taxes

Net income is the "bottom line"—the amount of profit remaining after all costs, expenses, and taxes. It can be retained within the business (retained earnings) or distributed to shareholders as dividends. Earnings per share (EPS) is derived from net income divided by the weighted average number of diluted shares outstanding.

Sample Condensed Income Statement

Line Item	Amount (USD millions)	% of Revenue
Revenue	$500.0	100.0%
Cost of Goods Sold	($200.0)	40.0%
Gross Profit	$300.0	60.0%
SG&A Expenses	($100.0)	20.0%
R&D Expenses	($50.0)	10.0%
Operating Income (EBIT)	$150.0	30.0%
Interest Expense	($15.0)	3.0%
Income Before Tax	$135.0	27.0%
Income Tax (21%)	($28.4)	5.7%
Net Income	$106.6	21.3%

Key Ratios Derived from the Income Statement

Ratio	Formula	What It Measures
Gross Margin	Gross Profit / Revenue	Profitability of core production
Operating Margin	Operating Income / Revenue	Efficiency of core operations
Net Profit Margin	Net Income / Revenue	Overall profitability after all costs
EPS (Basic)	Net Income / Shares Outstanding	Earnings attributable to each share
P/E Ratio	Share Price / EPS	Market valuation relative to earnings

Common Pitfalls When Reading Income Statements

Non-recurring items: One-time charges or gains (restructuring charges, lawsuit settlements) can distort profitability metrics. Analysts typically adjust for these to assess "normalized" earnings.
Revenue recognition timing: Companies have discretion in when they recognize revenue. Aggressive revenue recognition—booking future revenue early—can inflate current-period results.
Accounting method differences: Comparisons across companies can be misleading if they use different accounting methods (e.g., FIFO vs. LIFO inventory accounting).
Non-cash charges: Amortization of intangibles (often large after acquisitions) and stock-based compensation can significantly reduce reported net income without affecting cash flow.

Reading an income statement in isolation provides limited insight. It is most useful when analyzed alongside the balance sheet and cash flow statement, compared to prior periods for trend analysis, and benchmarked against industry peers.

This article is for informational purposes only and does not constitute financial advice. Consult a qualified financial advisor before making investment decisions.