vertical analysis

Think of a household budget written as 'out of every dollar I earn, 30 cents goes to rent, 15 to food, 10 to savings'. Reading the budget this way — as slices of one whole — is exactly what vertical analysis does to a financial statement. Instead of staring at raw amounts, it expresses every line as a percentage of one chosen total on the same statement.

On an income statement, that total is usually net sales (set to 100%), and each item below is shown as its share of sales: cost of goods sold might be 64% of sales, gross profit 36%, net income 8%. On a balance sheet, the base is total assets (100%), and every asset and claim is shown as a percentage of it. Reading down the column — vertically — you see the internal structure of the business. For instance, if cost of goods sold is 64% of sales, then every 100 of sales leaves 36 of gross profit before other expenses.

Vertical analysis matters because it strips away size. A corner shop and a giant chain cannot be compared in raw dollars, but expressing both 'per 100 of sales' puts them on equal footing, and lets you compare one company against industry norms. When a whole statement is rebuilt this way it is called a common-size statement. The caveat: percentages hide scale — a thin margin on enormous sales can dwarf a fat margin on tiny sales, so vertical analysis is best read alongside the absolute figures.