Comparative Statements vs Common Size Statements: Meaning and Difference

Comparative statements and common size statements belong to the same chapter, so students often try to learn them together.

That is useful, but only if the basic difference is clear.

Comparative statements ask:

How much has each item changed from one year to another?

Common size statements ask:

What percentage of the total does each item represent?

One studies movement. The other studies structure.

Once you remember this, the formats, formulas, and interpretation become much easier.

Why These Statements Are Prepared

A normal financial statement gives amounts.

For example:

Particular	Amount
Revenue from operations	Rs. 12,00,000
Cost of goods sold	Rs. 7,80,000
Gross profit	Rs. 4,20,000

This tells us what happened in one year.

But a good accountancy answer should often go one step further. It should help the reader understand whether the business is improving, weakening, becoming costlier to run, depending more on assets, or changing its financial position.

That is where comparative and common size statements help.

They do not create new accounts. They rearrange the same information so that the meaning becomes clearer.

The Simple Memory Trick

Think of a company as a building.

A comparative statement is like looking at two photographs of the same building taken in different years. You notice what has grown, what has reduced, and by how much.

A common size statement is like looking at the building’s internal layout. You notice what percentage of the space is used by each floor or room.

Both are useful, but they answer different questions.

Statement	Main question
Comparative statement	What changed between two periods?
Common size statement	What is the share of each item in the total?

What Is a Comparative Statement?

A comparative statement is a financial statement that shows figures of two periods side by side, along with the increase or decrease in each item.

It can be prepared for:

• statement of profit and loss
• balance sheet

In a comparative statement, the usual columns are:

Column	What it shows
Particulars	Name of the item
Previous year amount	Amount in the earlier year
Current year amount	Amount in the later year
Absolute change	Increase or decrease in rupees
Percentage change	Increase or decrease in percentage

The purpose is to understand the direction and size of change.

For example, if revenue increases from Rs. 10,00,000 to Rs. 12,00,000, the comparative statement tells us that revenue increased by Rs. 2,00,000, or 20 percent.

That is why comparative analysis is also called horizontal analysis. The figures are compared across time, usually from one year to another.

Formula for Comparative Statement

There are two important calculations.

Calculation	Formula
Absolute change	Current year amount - Previous year amount
Percentage change	Absolute change / Previous year amount x 100

Suppose sales were Rs. 8,00,000 last year and Rs. 10,00,000 this year.

Absolute change = Rs. 10,00,000 - Rs. 8,00,000
Absolute change = Rs. 2,00,000

Percentage change = Rs. 2,00,000 / Rs. 8,00,000 x 100
Percentage change = 25 percent

So sales increased by Rs. 2,00,000, or 25 percent.

What a Comparative Statement Helps You See

A comparative statement is useful because it shows change clearly.

It helps you notice questions like:

• Has revenue increased or decreased?
• Have expenses increased faster than revenue?
• Has profit improved?
• Have assets grown?
• Have liabilities increased too sharply?
• Has capital or reserve changed?

The real value is not just in calculating the columns. The value is in reading the relationship between the columns.

For example, suppose revenue increases by 20 percent, but cost of goods sold increases by 35 percent. At first, the business looks better because sales have increased. But after analysis, we can see that costs are rising faster than sales.

That is a useful observation.

What Is a Common Size Statement?

A common size statement shows every item as a percentage of one common base.

It can also be prepared for:

• statement of profit and loss
• balance sheet

In a common size statement of profit and loss, revenue from operations is usually taken as 100.

In a common size balance sheet, total assets are taken as 100 on the assets side. Total equity and liabilities are taken as 100 on the equity and liabilities side.

The purpose is to understand the proportion of each item.

For example, if revenue from operations is Rs. 12,00,000 and cost of goods sold is Rs. 7,80,000, then cost of goods sold is 65 percent of revenue from operations.

This tells us that for every Rs. 100 of revenue, Rs. 65 is going into cost of goods sold.

That is why common size analysis is also called vertical analysis. Each item is compared with a base amount inside the same statement.

Formula for Common Size Statement

The formula is:

Calculation	Formula
Common size percentage	Item amount / Common base amount x 100

Suppose revenue from operations is Rs. 10,00,000 and gross profit is Rs. 4,00,000.

Common size percentage of gross profit = Rs. 4,00,000 / Rs. 10,00,000 x 100
Common size percentage of gross profit = 40 percent

This means gross profit is 40 percent of revenue from operations.

Common Base in Common Size Statements

Choosing the correct base is very important.

Statement	Common base
Common size statement of profit and loss	Revenue from operations
Common size balance sheet, assets side	Total assets
Common size balance sheet, equity and liabilities side	Total equity and liabilities

If the base is wrong, the entire answer becomes weak even if the arithmetic looks neat.

For a statement of profit and loss, students sometimes use total revenue by mistake. In most school-level formats, revenue from operations is the expected base unless the question clearly says otherwise.

For a balance sheet, do not use fixed assets as the base for assets. Use total assets. Also do not use share capital as the base for equity and liabilities. Use total equity and liabilities.

Comparative Statements vs Common Size Statements

Here is the difference in a clean format:

Basis	Comparative statements	Common size statements
Main purpose	To show increase or decrease over time	To show each item as a percentage of a common base
Main focus	Change	Proportion
Type of analysis	Horizontal analysis	Vertical analysis
Usual columns	Two year amounts, absolute change, percentage change	Amounts and percentage of common base
Base used	Previous year amount for percentage change	Common base such as revenue from operations or total assets
Useful for	Seeing growth, decline, and trends	Seeing structure and relative weight
Example question	By what percentage did revenue increase?	What percentage of revenue was spent on cost of goods sold?
Best warning sign	Expenses rising faster than income	Expenses taking a larger share of income

Both statements can be prepared from the same financial data. The difference is in how the data is studied.

A Solved Example

Let us use a simple statement of profit and loss.

Particular	Previous year	Current year
Revenue from operations	Rs. 10,00,000	Rs. 12,00,000
Cost of goods sold	Rs. 6,00,000	Rs. 7,80,000
Operating expenses	Rs. 2,00,000	Rs. 2,10,000
Profit	Rs. 2,00,000	Rs. 2,10,000

Comparative View

In the comparative statement, we calculate absolute change and percentage change.

Particular	Previous year	Current year	Change	Percentage change
Revenue from operations	Rs. 10,00,000	Rs. 12,00,000	Rs. 2,00,000	20 percent
Cost of goods sold	Rs. 6,00,000	Rs. 7,80,000	Rs. 1,80,000	30 percent
Operating expenses	Rs. 2,00,000	Rs. 2,10,000	Rs. 10,000	5 percent
Profit	Rs. 2,00,000	Rs. 2,10,000	Rs. 10,000	5 percent

Now read the story.

Revenue increased by 20 percent, which looks good. But cost of goods sold increased by 30 percent, which is faster than the increase in revenue. Profit increased by only 5 percent.

So the business sold more, but it did not convert that growth into much higher profit.

This is exactly what comparative statements are meant to reveal.

Common Size View

Now take revenue from operations as 100 in each year.

Particular	Previous year percentage	Current year percentage
Revenue from operations	100 percent	100 percent
Cost of goods sold	60 percent	65 percent
Operating expenses	20 percent	17.5 percent
Profit	20 percent	17.5 percent

Now the story becomes even clearer.

Cost of goods sold was 60 percent of revenue last year. It became 65 percent of revenue this year.

Profit was 20 percent of revenue last year. It became only 17.5 percent this year.

So even though profit increased in rupees, profit became a smaller part of revenue.

This is why strong answers do not stop at arithmetic. They explain what the figures mean.

How to Prepare a Comparative Statement

Use this order:

Step	What to do
1	Write the particulars in the correct statement format
2	Write the previous year amount
3	Write the current year amount
4	Calculate current year amount minus previous year amount
5	Calculate percentage change using the previous year amount
6	Mark increase or decrease clearly

For percentage change, always pause and check the denominator.

Percentage change = Change / Previous year amount x 100

If the change is negative, show it as a decrease. You may use brackets or write “decrease”, depending on the format expected in the question.

How to Prepare a Common Size Statement

Use this order:

Step	What to do
1	Write the particulars in the correct statement format
2	Write the amount for the year
3	Choose the correct common base
4	Treat the common base as 100
5	Calculate each item as a percentage of the base
6	Compare the percentages if more than one year is given

For a statement of profit and loss:

Percentage = Item amount / Revenue from operations x 100

For the assets side of a balance sheet:

Percentage = Asset item / Total assets x 100

For the equity and liabilities side:

Percentage = Equity or liability item / Total equity and liabilities x 100

Which One Is More Useful?

Neither is automatically better.

They are useful for different reasons.

Comparative statements are stronger when you want to understand growth, decline, and direction. They are helpful when the question gives two years and asks for changes.

Common size statements are stronger when you want to understand composition. They are helpful when the question asks how much each item forms of the total, or when businesses of different sizes need to be compared.

For example, one company may have revenue of Rs. 50,00,000 and another may have revenue of Rs. 5,00,000. The larger company has bigger rupee amounts, but that does not automatically mean it is more efficient.

Common size percentages can show whether both companies spend the same proportion on cost, earn the same proportion as profit, or use assets in a similar pattern.

Common Mistakes Students Make

The mistakes in this topic are usually small, but they affect many rows at once.

Mistake 1: Using the Wrong Base

In comparative statements, the base for percentage change is the previous year amount.

In common size statements, the base is the common base inside the statement.

Do not mix these two.

Mistake 2: Treating Rupee Increase as Improvement

An increase is not always good.

If revenue increases, that is usually positive. But if expenses, liabilities, or cost of goods sold increase faster than revenue, the situation may need careful reading.

Mistake 3: Forgetting That Profit Can Rise but Profit Percentage Can Fall

This is a very important point.

Profit may increase in rupees, but still become a smaller percentage of revenue.

That means the business earned more in total, but kept less out of every Rs. 100 of sales.

Mistake 4: Writing Only the Table and No Interpretation

The table is important, but it is not the full answer.

If the question asks for analysis, add one or two lines explaining what the table shows.

For example:

Revenue increased by 20 percent, but cost of goods sold increased by 30 percent. This reduced the profit margin from 20 percent to 17.5 percent.

That line shows understanding.

Mistake 5: Ignoring Zero or Negative Base Amounts

If the previous year amount is zero, percentage change cannot be calculated in the usual way.

For example, if an expense was zero last year and Rs. 20,000 this year, writing “100 percent increase” is not correct. There was no previous year base.

In such cases, follow the instruction in the question. If no instruction is given, write the rupee change clearly and avoid forcing a misleading percentage.

How to Interpret the Answer Like a Good Student

When you finish a comparative statement, ask:

• Which items increased the most?
• Which items decreased?
• Did revenue and profit move in the same direction?
• Did expenses grow faster than income?
• Did assets grow because of capital, borrowings, or current liabilities?

When you finish a common size statement, ask:

• What percentage of revenue is left as profit?
• Which expense takes the largest share of revenue?
• What percentage of assets is current assets?
• What percentage of funds comes from owners?
• What percentage comes from borrowings or current liabilities?

These questions help you move from calculation to interpretation.

Quick Revision Table

Point	Comparative statement	Common size statement
One-line meaning	Shows change between periods	Shows each item as a percentage of a base
Main formula	Change / Previous year amount x 100	Item / Common base x 100
Key word	Change	Share
Time focus	Two periods are compared	One or more periods can be shown as percentages
Profit and loss base	Previous year amount for change	Revenue from operations
Balance sheet base	Previous year amount for change	Total assets or total equity and liabilities
Main use	Trend and direction	Structure and composition

If you remember only one line, remember this:

Comparative statements show how far the numbers moved. Common size statements show how heavy each number is in the total.

Frequently Asked Questions

What is the main difference between comparative statements and common size statements?

Comparative statements show the increase or decrease in financial items over two periods. Common size statements show each item as a percentage of a common base, such as revenue from operations or total assets.

Why is comparative analysis called horizontal analysis?

It is called horizontal analysis because figures are compared across periods, usually by reading the same item from one year to the next.

Why is common size analysis called vertical analysis?

It is called vertical analysis because each item is compared with a common base within the same statement, such as revenue from operations in a statement of profit and loss.

What is the formula for percentage change in a comparative statement?

The formula is:

Percentage change = Absolute change / Previous year amount x 100

The previous year amount is used as the base.

What is the base for a common size statement of profit and loss?

Revenue from operations is usually taken as the base and treated as 100. Other items are then shown as a percentage of revenue from operations.

What is the base for a common size balance sheet?

On the assets side, total assets are taken as 100. On the equity and liabilities side, total equity and liabilities are taken as 100.

Which statement is better for comparing companies of different sizes?

A common size statement is usually better for comparing companies of different sizes because it converts amounts into percentages. This makes the structure easier to compare.

Can both statements be prepared from the same data?

Yes. The same financial data can be used to prepare both statements. A comparative statement will show change, while a common size statement will show proportion.

What should I do if the previous year amount is zero in a comparative statement?

Do not force a normal percentage change. Show the rupee change clearly and follow the question’s instruction. If no instruction is given, mention that percentage change is not meaningful because there is no previous year base.