What it means
The idea is simple: pick a base number, divide everything else by it, and express the answer as a %. On an income statement the base is revenue, so cost of sales, marketing and profit all become percentages of the top line.
On a balance sheet the base is total assets, so inventory or debt is shown as a share of everything the company owns. This matters because raw dollar figures hide the story.
A company whose marketing spend rose from $400,000 to $600,000 looks like it is spending freely, but if revenue doubled over the same period, marketing actually fell as a share of sales. Percentages answer the question managers really care about, which is whether costs are growing faster than the revenue paying for them.
Vertical analysis is also how you compare businesses of wildly different sizes. A regional retailer and a national chain cannot be compared on dollar profit, but both can be compared on gross margin % and overhead as a share of sales.
That is why analysts almost always common-size a set of accounts before benchmarking them against competitors. In use, the technique is usually paired with horizontal analysis, which tracks how each line moves over time.
Together they answer two different questions: vertical analysis asks what the money is being spent on, and horizontal analysis asks what is changing. Most management packs show both side by side.
The nuance is choosing the right base and sticking to it. Some analysts common-size the cash flow statement against revenue, which works perfectly well, but mixing bases within a single statement makes the percentages meaningless and is a frequent error in home-made reporting.
In practice
Real-world examples.
Example
A software company common-sizes three years of its income statement and finds that research and development has held steady at 22% of revenue while sales and marketing has climbed from 30% to 41%. Revenue grew in every year, so the dollar increase looked fine, but the percentage shows customer acquisition is getting steadily more expensive.
Example
A private equity analyst common-sizes the balance sheets of four potential acquisition targets in the same sector. One holds inventory equal to 38% of total assets against a sector norm nearer 20%, which prompts a hard look at obsolete stock before any offer is made.
Example
A restaurant group runs vertical analysis on each site monthly, with food cost, labour cost and rent all expressed as a % of sales. One venue shows labour at 34% of sales against a group average of 27%, which turns a vague sense that the site is underperforming into a specific rostering conversation.
Think of it
“Vertical analysis is like expressing your budget as percentages of income. Saying rent is 30% of income is more meaningful when comparing.
Formula
Calculation
Line item % = line item / base figure x 100
Base figure = total revenue (income statement) or total assets (balance sheet)
A specialist food manufacturer reports the following year:
Revenue $2,000,000 = 100%
Cost of goods sold $1,200,000: $1,200,000 / $2,000,000 = 60%
Gross profit $800,000: $800,000 / $2,000,000 = 40%
Selling and administrative costs $500,000: $500,000 / $2,000,000 = 25%
Operating profit $300,000: $300,000 / $2,000,000 = 15%
The common-size view says that for every $1 of sales, 60 cents goes to making the product, 25 cents to running the company and 15 cents is left as operating profit. If comparable manufacturers typically run cost of goods sold at 55%, this business is giving away 5 cents of every sales dollar, which is worth $100,000 a year at current revenue and is a far more useful target than a vague instruction to cut costs.Case study
Seen in the real world.
The following is an illustrative, fictional scenario. Northbeck Outdoor, an invented chain of camping equipment stores, grew revenue from $8,000,000 to $14,000,000 over three years and the board was pleased with itself. Profit had grown too, from $640,000 to $840,000, so nobody looked much further.
A new finance director common-sized the accounts. Gross margin had slipped from 42% to 37% as the chain discounted to drive volume, and store overheads had risen from 26% to 28% of sales as new sites opened. Net margin had fallen from 8% to 6%, meaning the business was working almost twice as hard for a much thinner slice of each sale.
The vertical analysis reframed the whole discussion. Rather than celebrating revenue growth, the board set a gross margin floor of 40% for promotional activity and paused two planned store openings. In this illustrative case, the percentages said something the dollar figures had been carefully hiding.
Watch out
Common mistakes.
- Changing the base figure between periods or statements. If one year is common-sized against revenue and another against gross profit, the comparison is worthless even though every individual number is correct.
- Reading percentages without the underlying dollars. A cost line falling from 4% to 3% of sales sounds like a saving, but if revenue tripled the actual spend may have risen sharply.
- Assuming a percentage that differs from the sector average is automatically a problem. A business that owns its premises will show very different balance sheet percentages from one that leases, with no implication that either is wrong.
Questions
People also ask.
What is the difference between vertical and horizontal analysis?
Vertical compares lines within a single period against a base figure, while horizontal compares the same line across periods to show growth or decline.
Can vertical analysis be applied to the balance sheet?
Yes, with total assets as the base, which shows the mix of what the company owns and how much of it is funded by debt rather than equity.
Is a common-size statement the same thing?
Effectively yes, since a common-size statement is simply the output of vertical analysis presented as a full statement in percentages.
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