The formulas
- Each line / revenue x 100
- Gross margin = (revenue - cost of sales) / revenue
- Net income = revenue - cost of sales - operating expenses - interest and other - tax
How it works
A common-size statement divides every line by revenue, which removes the effect of growth and lets you compare periods and peers. This is vertical analysis. A drop in gross margin with steady operating expenses points to pricing or cost of sales issues.
In audit planning, a line whose share of revenue moves without an explanation, such as a rise in cost of sales share or a fall in the tax share of revenue, is a lead for inquiry. Always compare the movement to what management and operating data say.
Illustrative figures only. Check the result against your firm's methodology before relying on it.
Common questions
Why use revenue as the base?
It is the standard base for an income statement. Balance sheets use total assets.
Are points the same as percent change?
No. Points are the arithmetic difference between two percentages.
Can I add more lines?
Combine lines into the five shown, or use a spreadsheet for a full statement.
Formulas on this page are the standard definitions.
Runs in your browser. The figures you type are not sent to CORAA or stored. Check the result against your firm's methodology before relying on it.