Reading an Income Statement
Overview
The income statement (profit & loss statement) shows a company's revenue, expenses, and profit over a specific period — it is one of the three essential financial documents every stock investor must master. Learn to identify revenue growth, operating margins, and net income trends that signal whether a business is thriving or deteriorating. Income statement analysis forms a cornerstone of value investing and earnings valuation analysis, helping you judge profitability before committing capital. Use our stock screener to filter companies by revenue growth and margin trends before diving into individual reports.
Key Takeaways
- Revenue (top line) is total sales before any deductions.
- Gross profit = Revenue minus Cost of Goods Sold (COGS).
- Operating income strips out SG&A and R&D to show core business profitability.
- Net income (bottom line) is what's left after taxes, interest, and all expenses.
Practical Tips
- Compare revenue growth year-over-year — declining top-line growth is a red flag.
- Track operating margin over 5+ years to spot improving or deteriorating efficiency.
- Look for non-recurring charges that artificially inflate or deflate net income.
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Understanding the Balance Sheet
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How to Read SEC Filings (10-K & 10-Q)
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