Common-Size, Trend, and Statement Analysis

Common-size, trend, and ratio analysis provide complementary views of financial statements. Vertical analysis shows composition within a period, trend analysis shows movement across periods, and ratios relate selected amounts to answer a defined profitability, liquidity, leverage, coverage, or efficiency question.

The method must match the question. A percentage can reduce scale differences, but it cannot make unlike accounting policies, business models, or periods comparable.

Core Guides

Horizontal Analysis Is Not Horizontal Form

Horizontal analysis compares the same line across periods, commonly using absolute and percentage changes. Trend analysis includes this method and extends it to longer histories, indexed values, ratios, and operating drivers.

A balance sheet arranged with assets on one side and liabilities plus equity on the other is sometimes called account form or horizontal form. That is a visual layout, not a multi-period analysis method. See Balance Sheet for statement presentation.

Example in Context

Suppose revenue rises from $100 million to $120 million, while operating income rises from $15 million to $15.6 million.

• Horizontal analysis shows revenue increased 20% and operating income increased 4%.
• Vertical analysis shows operating margin fell from 15% to 13%.
• Ratio analysis can test whether asset turnover, returns, liquidity, or leverage also changed.
• Baseline analysis can compare the 13% margin with the budget, peer median, or a normalized prior period.

No single result explains the cause. Price, volume, mix, costs, acquisitions, currency, and classification all require supporting evidence.

What to Verify

• Numerator, denominator, base period, and selected comparison group.
• Period length, fiscal calendar, currency, and continuing-operations scope.
• Restatements, accounting changes, acquisitions, disposals, and unusual items.
• Original dollar amounts behind percentages and indexed series.
• Negative, zero, or unusually small bases that make percentage changes unstable.
• Notes and management discussion explaining material movements.

This section is for financial education only and does not provide accounting, audit, tax, legal, lending, valuation, securities, or investment advice.

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