A common size income statement is a financial statement that presents a company's income statement figures as a percentage of total revenue or net sales. This format allows analysts, investors, and stakeholders to assess the relative size of each expense and income item in relation to the company's revenue. By expressing financial information in this manner, common size income statements facilitate comparisons across different companies, industries, and time periods, offering insights into the composition of expenses and the company's profitability structure.

Constructing a Common Size Income Statement

To create a common size income statement, each line item in the income statement is divided by the company's total revenue (or net sales) for the same period and then multiplied by 100 to express the value as a percentage. This process standardizes the financial data, enabling easier analysis and benchmarking.

The formula for calculating common size percentage for an item is as follows:

Common Size Percentage = (Item Amount / Total Revenue) x 100

Benefits of a Common Size Income Statement

1. Comparability: By converting financial data into percentages of revenue, the common size income statement facilitates meaningful comparisons between companies of varying sizes and industries. This makes it easier to identify trends, similarities, and differences in the income and expense structure.
2. Expense Allocation: Common size analysis helps pinpoint the major contributors to a company's expenses. This information can aid in cost management strategies and decisions.
3. Identifying Trends: Over time, changes in the common size percentages of income and expense items can indicate shifts in business operations, cost structures, or revenue generation.
4. Performance Evaluation: Investors and analysts can use common size income statements to evaluate a company's financial performance and efficiency ratios more effectively.
5. Industry Benchmarking: Comparing common size income statements of companies within the same industry allows for benchmarking and identifying potential industry standards and outliers.

Components of a Common Size Income Statement

A common size income statement typically includes the following components presented as a percentage of total revenue:

1. Revenue: The top line item, often referred to as net sales or total revenue, serves as the denominator for calculating the common size percentages of other line items.
2. Cost of Goods Sold (COGS): COGS includes the direct costs associated with producing or acquiring goods sold by the company. It's expressed as a percentage of total revenue and indicates the portion of revenue consumed by production costs.
3. Gross Profit: Gross profit is calculated by subtracting COGS from total revenue. The gross profit percentage reveals the company's ability to generate profit from its core operations.
4. Operating Expenses: This category encompasses various expenses related to the company's ongoing operations, such as selling, general, and administrative expenses (SG&A). By expressing operating expenses as a percentage of revenue, analysts can evaluate the efficiency of cost management.
5. Operating Income: Operating income, also known as operating profit or EBIT (earnings before interest and taxes), represents the company's profit from core operations before interest and taxes. It's calculated by subtracting operating expenses from gross profit.
6. Other Income and Expenses: This category includes income and expenses not directly related to the company's core operations. Common size analysis allows for assessing the impact of these items on overall profitability.
7. Income Taxes: The percentage of income taxes to total revenue reveals the company's tax burden relative to its revenue.
8. Net Income: Net income is the final figure, representing the company's profit after all expenses, interest, taxes, and other income or losses have been accounted for. The common size net income percentage provides insights into overall profitability.

Use Cases for Common Size Income Statements

1. Financial Analysis: Investors and analysts use common size income statements to assess a company's financial health, profitability, and expense structure over time.
2. Comparative Analysis: By comparing the common size income statements of multiple companies within an industry, investors can identify which companies allocate their expenses more efficiently and generate higher profits relative to revenue.
3. Trend Identification: Analyzing common size statements from different periods helps identify trends and changes in the company's operations and financial performance.
4. Investment Decision-Making: Investors can use common size income statements to make informed decisions about investing in or divesting from a particular company based on its profitability structure and efficiency.
5. Performance Evaluation: Companies can evaluate their financial performance by comparing their common size income statements with industry averages and identifying areas for improvement.

The Bottom Line

The common size income statement is a valuable financial analysis tool that provides insights into a company's revenue composition and expense structure. By expressing income and expense items as percentages of total revenue, analysts, investors, and stakeholders can easily compare companies, track trends, and make informed decisions about investments, cost management, and strategic planning. It allows for a standardized evaluation of financial performance, highlighting key factors influencing a company's profitability and growth.