How To Calculate Common Size Income Statement Example

Analyze your financial performance by converting absolute numbers to percentages of sales

Comprehensive Guide: How to Calculate a Common Size Income Statement (With Examples)

A common size income statement is a powerful financial analysis tool that expresses each line item as a percentage of revenue (or sales). This standardization allows for easy comparison between companies of different sizes or across different periods for the same company. Unlike traditional income statements that show absolute dollar amounts, common size statements reveal the proportional relationships between various income and expense items.

Why Use Common Size Income Statements?

• Comparative Analysis: Easily compare financial performance between companies of different sizes or industries
• Trend Analysis: Identify patterns and changes in financial structure over multiple periods
• Performance Benchmarking: Compare your company’s performance against industry averages or competitors
• Financial Health Assessment: Quickly spot areas where expenses are too high relative to revenue
• Investment Decision Making: Helps investors evaluate companies more objectively by removing size bias

Step-by-Step Calculation Process

1. Gather Your Income Statement Data

   Collect all the line items from your standard income statement, including:

   • Revenue/Sales
   • Cost of Goods Sold (COGS)
   • Gross Profit
   • Operating Expenses (SG&A, R&D, Depreciation, etc.)
   • Operating Income
   • Non-operating Items (Interest, Taxes)
   • Net Income

2. Identify Your Base Figure

   In a common size income statement, revenue (or sales) is always the base figure (100%). All other items will be expressed as a percentage of this base.

3. Calculate Each Line Item as a Percentage

   For each line item, divide the amount by total revenue and multiply by 100 to get the percentage:

   Formula: (Line Item Amount / Total Revenue) × 100

   For example, if COGS is $500,000 and revenue is $1,000,000:

   (500,000 / 1,000,000) × 100 = 50%

4. Present the Data

   Create a new income statement showing both the absolute dollar amounts and their corresponding percentages of revenue.

5. Analyze the Results

   Compare your percentages to:

   • Industry benchmarks
   • Previous periods for your company
   • Competitors’ common size statements

Common Size Income Statement Example

Let’s examine a practical example using a fictional company, TechGrowth Inc., with the following income statement data for 2023:

Line Item	Amount ($)	Percentage of Revenue
Revenue	$1,200,000	100.0%
Cost of Goods Sold	$660,000	55.0%
Gross Profit	$540,000	45.0%
SG&A Expenses	$240,000	20.0%
Depreciation	$60,000	5.0%
Operating Income	$240,000	20.0%
Interest Expense	$24,000	2.0%
Income Before Taxes	$216,000	18.0%
Income Taxes	$64,800	5.4%
Net Income	$151,200	12.6%

From this common size statement, we can observe that:

• COGS represents 55% of revenue, which is typical for many manufacturing companies
• SG&A expenses at 20% might be high compared to industry averages (often 10-15%)
• The operating margin is 20%, which is strong
• Net profit margin is 12.6%, which is healthy for many industries

Industry Benchmarks and Comparisons

To properly interpret your common size income statement, it’s essential to compare your percentages against industry benchmarks. Here’s a comparison of average common size percentages across different industries:

Industry	Gross Margin	Operating Margin	Net Profit Margin	SG&A as % of Revenue
Software (SaaS)	70-80%	15-25%	10-20%	30-50%
Retail	25-35%	3-8%	1-5%	20-30%
Manufacturing	30-50%	8-15%	4-10%	15-25%
Restaurant	60-70%	5-15%	2-8%	25-35%
Automotive	15-25%	3-10%	1-6%	10-20%

Source: IRS Corporate Tax Statistics and industry reports

Advanced Applications of Common Size Analysis

Beyond basic financial analysis, common size income statements have several advanced applications:

1. Vertical Analysis Over Time

   By preparing common size statements for multiple years, you can identify trends in your cost structure and profitability. For example, if your SG&A expenses as a percentage of revenue are increasing over time, it may indicate inefficiencies that need to be addressed.

2. Peer Group Comparison

   When evaluating potential investments or acquisitions, common size statements allow you to compare companies of different sizes on an equal footing. This is particularly useful in industries with both large and small players.

3. Credit Analysis

   Lenders often use common size statements to assess a company’s ability to generate consistent cash flows relative to its revenue. A company with stable gross margins and controlled operating expenses is generally viewed as a better credit risk.

4. Valuation Multiples

   In business valuation, common size analysis helps in determining appropriate valuation multiples. Companies with higher and more stable operating margins typically command higher valuation multiples.

5. Budgeting and Forecasting

   Common size historical data provides a basis for creating more accurate budgets and forecasts. By understanding the typical relationships between revenue and expenses, you can create more realistic financial projections.

Common Mistakes to Avoid

While common size income statements are valuable tools, there are several pitfalls to avoid:

• Ignoring Industry Differences: Comparing common size percentages across vastly different industries can lead to incorrect conclusions. Always compare against industry-specific benchmarks.
• Overlooking One-Time Items: Non-recurring expenses or revenues can distort your common size percentages. Consider adjusting for these items when analyzing trends.
• Focusing Only on Percentages: While percentages are important, don’t ignore the absolute dollar amounts, especially when dealing with very small or very large companies.
• Neglecting the Balance Sheet: For a complete picture, perform common size analysis on both the income statement and balance sheet.
• Using Inconsistent Base Figures: Always use total revenue (or sales) as your base (100%) for income statement analysis. Using other bases can lead to confusion.

How to Improve Your Common Size Percentages

If your common size analysis reveals areas for improvement, consider these strategies:

1. Improve Gross Margins
   • Negotiate better prices with suppliers
   • Improve production efficiency
   • Optimize your product mix to favor higher-margin items
   • Implement better inventory management
2. Control Operating Expenses
   • Automate repetitive tasks to reduce labor costs
   • Renegotiate service contracts
   • Implement cost-control measures without sacrificing quality
   • Outsource non-core functions when cost-effective
3. Enhance Revenue Quality
   • Focus on recurring revenue streams
   • Improve customer retention rates
   • Develop higher-margin products or services
   • Optimize pricing strategies
4. Optimize Tax Strategy
   • Take advantage of all available tax deductions and credits
   • Consider tax-efficient business structures
   • Implement tax planning strategies with professional advice

Common Size Analysis in Practice: Real-World Example

Let’s examine how common size analysis might be applied to a real-world scenario. Consider two companies in the same industry with very different revenue sizes:

	Company A	Company B
Revenue	$10,000,000	$50,000,000
COGS	$6,000,000	$30,000,000
Gross Profit	$4,000,000	$20,000,000
Operating Expenses	$2,500,000	$12,500,000
Operating Income	$1,500,000	$7,500,000
Net Income	$1,000,000	$5,000,000

At first glance, Company B appears much more profitable with $5 million in net income compared to Company A’s $1 million. However, when we convert to common size percentages:

	Company A	Company B
Revenue	100.0%	100.0%
COGS	60.0%	60.0%
Gross Profit	40.0%	40.0%
Operating Expenses	25.0%	25.0%
Operating Income	15.0%	15.0%
Net Income	10.0%	10.0%

We can see that both companies have identical financial structures when viewed as percentages of revenue. This reveals that:

• Both companies have the same cost structure
• Both are equally efficient in their operations
• Company B is simply a scaled-up version of Company A
• The apparent difference in profitability was solely due to size, not operational efficiency

Tools and Resources for Common Size Analysis

Several tools can help you perform and analyze common size income statements:

• Spreadsheet Software: Microsoft Excel or Google Sheets with proper formatting can easily create common size statements using simple formulas.
• Accounting Software: Many accounting platforms like QuickBooks, Xero, or FreshBooks can generate common size reports with proper configuration.
• Financial Analysis Tools: Platforms like Tableau, Power BI, or specialized financial analysis software can visualize common size data effectively.
• Industry Databases: Services like IBISWorld, S&P Capital IQ, or Bloomberg provide industry benchmark data for comparison.
• SEC Filings: For public companies, you can find detailed financial statements in SEC EDGAR database to create your own common size analyses.

Common Size Analysis vs. Other Financial Analysis Techniques

While common size analysis is valuable, it’s most effective when used in conjunction with other financial analysis methods:

Analysis Technique	Purpose	When to Use	Complements Common Size?
Ratio Analysis	Evaluates relationships between specific financial items	When you need specific performance metrics	Yes
Trend Analysis	Examines changes in financial data over time	When analyzing historical performance	Yes
Horizontal Analysis	Compares financial data across multiple periods	When assessing growth or decline	Yes
Vertical Analysis	Same as common size analysis	When comparing company structure	N/A
Benchmarking	Compares performance against industry standards	When evaluating competitive position	Yes
DuPont Analysis	Breaks down ROE into component parts	When analyzing profitability drivers	Yes

Limitations of Common Size Income Statements

While common size income statements are extremely useful, they do have some limitations:

• Industry Variations: What constitutes “good” percentages varies significantly by industry. A 5% net margin might be excellent in retail but poor in software.
• Company Size Effects: Very small companies often have different cost structures than large companies in the same industry.
• Accounting Method Differences: Companies using different accounting methods (cash vs. accrual) may show different common size percentages.
• One-Time Items: Non-recurring expenses or revenues can distort the percentages in a given period.
• Inflation Effects: In periods of high inflation, historical common size percentages may not be directly comparable.
• Business Model Differences: Companies with different business models in the same industry may have very different common size structures.

Best Practices for Common Size Analysis

To get the most value from common size income statements, follow these best practices:

1. Use Consistent Time Periods

   When comparing across periods, ensure you’re using the same length of time (e.g., fiscal year vs. fiscal year) for accurate comparisons.

2. Adjust for Seasonality

   If your business is seasonal, consider using trailing twelve-month (TTM) data rather than single-period data.

3. Segment Your Analysis

   If your company has multiple business segments, create common size statements for each segment to identify strengths and weaknesses.

4. Combine with Other Analyses

   Use common size analysis in conjunction with ratio analysis, trend analysis, and benchmarking for a complete picture.

5. Document Your Assumptions

   Clearly document any adjustments you make to the raw financial data and the reasons for those adjustments.

6. Update Regularly

   Prepare common size statements regularly (quarterly or annually) to track trends over time.

7. Seek Professional Advice

   For important financial decisions, consult with a financial advisor or accountant to interpret your common size analysis.

Common Size Income Statements for Different Business Types

The application and interpretation of common size income statements can vary by business type:

• Service Businesses:

  Typically have higher gross margins (often 50-70%) but may have higher SG&A expenses as a percentage of revenue due to labor-intensive operations.

• Retail Businesses:

  Usually show lower gross margins (20-40%) but can achieve good net margins through volume and efficient operations.

• Manufacturing Businesses:

  Often have moderate gross margins (30-50%) with significant variation based on the type of manufacturing (heavy vs. light).

• Technology Companies:

  Frequently demonstrate high gross margins (60-80%) but may have substantial R&D expenses that impact operating margins.

• Nonprofit Organizations:

  Focus on program expenses as a percentage of total revenue, with ideal ratios typically showing 75% or more going to program services.

Common Size Analysis in Financial Modeling

In financial modeling, common size analysis plays several important roles:

1. Historical Analysis:

   Common size statements help identify historical trends that can inform future projections.

2. Assumption Development:

   Historical common size percentages provide a basis for developing reasonable assumptions about future expense relationships.

3. Scenario Analysis:

   By adjusting common size percentages, you can model different scenarios (optimistic, base case, pessimistic).

4. Valuation:

   Common size analysis helps in determining appropriate valuation multiples by understanding the company’s cost structure and profitability drivers.

5. Sensitivity Analysis:

   You can test how sensitive your financial projections are to changes in key common size percentages.

How to Present Common Size Income Statements

When presenting common size income statements to stakeholders, consider these presentation tips:

• Use Clear Visuals: Present the data in both table and chart format for easier comprehension.
• Highlight Key Metrics: Emphasize the most important percentages (gross margin, operating margin, net margin).
• Provide Context: Include industry benchmarks or competitor comparisons when possible.
• Show Trends: If presenting multiple periods, use line charts to show trends over time.
• Explain Variances: Be prepared to explain significant variances from expectations or benchmarks.
• Keep It Simple: Avoid overwhelming your audience with too much detail. Focus on the most relevant insights.
• Tell a Story: Use the common size analysis to tell a story about the company’s financial performance and strategy.

Common Size Income Statement Template

Here’s a template you can use to create your own common size income statement:

Line Item	Amount ($)	% of Revenue
Revenue	[Amount]	100.0%
Cost of Goods Sold	[Amount]	[Calculation]
Gross Profit	[Amount]	[Calculation]
Operating Expenses:
– Selling, General & Administrative	[Amount]	[Calculation]
– Research & Development	[Amount]	[Calculation]
– Depreciation & Amortization	[Amount]	[Calculation]
Total Operating Expenses	[Amount]	[Calculation]
Operating Income	[Amount]	[Calculation]
Non-Operating Items:
– Interest Expense	[Amount]	[Calculation]
– Other Income/Expense	[Amount]	[Calculation]
Income Before Taxes	[Amount]	[Calculation]
Income Taxes	[Amount]	[Calculation]
Net Income	[Amount]	[Calculation]

To use this template:

1. Fill in the Amount column with your actual financial data
2. For each line item, calculate the percentage by dividing the amount by total revenue and multiplying by 100
3. Ensure the percentages for Gross Profit, Operating Income, and Net Income are calculated correctly as the differences between the percentages above them
4. Review the percentages to identify strengths, weaknesses, and opportunities for improvement

Common Size Analysis in Mergers and Acquisitions

Common size income statements play a crucial role in mergers and acquisitions (M&A) by:

• Facilitating Comparisons: Allowing acquirers to compare targets of different sizes on an equal basis.
• Identifying Synergies: Helping identify potential cost savings or revenue enhancements from combining operations.
• Assessing Integration Risks: Revealing differences in cost structures that might complicate post-merger integration.
• Valuation Support: Providing data to support valuation multiples and purchase price allocations.
• Due Diligence: Serving as a tool for financial due diligence to identify anomalies or red flags.

In M&A transactions, it’s common to prepare common size statements for:

• The target company (standalone)
• The acquirer (standalone)
• The combined entity (pro forma)

Future Trends in Common Size Analysis

As business and financial analysis evolve, several trends are emerging in common size analysis:

• Automated Analysis: AI and machine learning are increasingly being used to automatically generate and interpret common size statements from raw financial data.
• Real-Time Analysis: Cloud-based accounting systems now allow for real-time common size analysis, enabling more timely decision-making.
• Predictive Analytics: Advanced analytics tools can use historical common size data to predict future financial performance.
• Industry-Specific Benchmarks: More sophisticated industry-specific benchmarking databases are becoming available.
• Visualization Tools: New data visualization techniques are making common size analysis more intuitive and accessible to non-financial managers.
• Integration with Other Data: Common size financial data is being integrated with operational and market data for more comprehensive analysis.

Conclusion

Common size income statements are an essential tool in financial analysis that provide unique insights into a company’s financial structure and performance. By expressing each line item as a percentage of revenue, these statements eliminate the distorting effects of company size, allowing for meaningful comparisons across companies and time periods.

Whether you’re a business owner looking to improve your company’s financial performance, an investor evaluating potential opportunities, or a financial analyst conducting due diligence, mastering common size analysis will enhance your ability to make informed financial decisions.

Remember that while common size income statements are powerful, they should be used in conjunction with other financial analysis techniques for a complete understanding of a company’s financial health. Regular preparation and review of common size statements can help you identify trends, spot potential issues early, and make data-driven decisions to improve your company’s financial performance.

For further learning, consider these authoritative resources:

• U.S. Securities and Exchange Commission – How to Read a 10-K
• U.S. Small Business Administration – Understanding Financial Statements
• SEC Investor Bulletin: How to Read a Company’s Financial Statements