Financial Accounting · Ratios

Purpose and Limitations of Ratio Analysis in ACCA Financial Accounting

Updated 11 October 2026 · Fact-checked

Ratio analysis turns financial statement figures into percentages and multiples so you can judge performance and position, and compare across years or businesses. Its limits: it uses historic data, depends on accounting policies, ignores non-financial factors, and a single ratio proves little. Always compare and then investigate the cause.

Understand Purpose and Limitations of Ratio Analysis

A financial statement gives you raw numbers. Revenue of $5m means little on its own. Is that good? Compared with what? A ratio divides one figure by another, so you can see the relationship between them. Profit as a share of revenue, or current assets against current liabilities, tells you far more than either number alone.

Ratios are used to assess two things. Performance is how well the business earned profit and used its resources during the period. Position is the financial strength at the year end: can it pay its debts, and how is it funded? Users such as investors, lenders and managers all ask these questions.

A ratio only has meaning when compared. You can compare with the same business in earlier years (a trend), with another similar business, with the industry average, or with a target or budget. Then you ask why the ratio moved or differs. The exam rewards the reason, not just the number.

Ratios have real limits. The figures are historic, so they show what happened, not what will happen. The statement of financial position is a snapshot on one date, which may not be typical, for example if the business is seasonal. Different businesses may use different accounting policies, such as straight-line or reducing balance depreciation, or different inventory methods, which makes comparison unreliable. Revaluation of assets, inflation, and window dressing near the year end can distort results.

Ratios also ignore non-financial information, such as staff quality, customer satisfaction, market conditions and management skill. Businesses in different industries or of different sizes may not be comparable. And ratios show symptoms, not causes. Treat them as a starting point for questions, not as the answer.

Key formulas to remember

Basic idea of a ratio: Ratio = one figure ÷ a related figure; Express as a percentage, a multiple (times) or a number of days, depending on the ratio.
Valid comparison bases: Trend over time | Other businesses | Industry average | Budget or target; A ratio with no comparison has little meaning. Use like-for-like figures.
Main limitations to remember: Historic data | Different accounting policies | Snapshot date | Inflation | Non-financial factors ignored | Window dressing | Dissimilar businesses; Pick the limitation that fits the scenario given in the question.

How to solve Purpose and Limitations of Ratio Analysis questions

Use this method for any question on the purpose, use or limitations of ratios.

1Read the question and identify what is asked: a purpose, an interpretation, or a limitation.
2Identify the users and their need, for example a lender focused on liquidity and gearing, an investor focused on profit and returns.
3Note the comparison base given: prior year, another business, or industry average.
4If figures are given, calculate or read the ratio, then state the direction of change or the difference.
5Give a reason for the change or difference using clues in the scenario, such as price cuts, new loans or a change in policy.
6Check whether the comparison is fair: same policies, same date, same size and industry, same period length.
7State the conclusion in one sentence and, if asked, name the limitation that weakens it.

Quickest way: Match the clue to the limitation

When to use it: Use this on multiple choice questions that ask which statement is a limitation or a purpose of ratio analysis.

Scan the options for keywords: historic, policy, snapshot, inflation, non-financial.
Eliminate options that claim ratios predict the future or give a complete picture. These are false.
Eliminate options that describe a benefit when a limitation is asked, and the reverse.
If the scenario mentions two businesses, think of different accounting policies first.
For multiple response, select exactly the number stated, choosing the clearest limitations.

Common mistakes in Purpose and Limitations of Ratio Analysis

Saying ratios predict future performance.
Students confuse trends with forecasts.
Fix: Remember that ratios use historic data. They may help you judge the future but they do not forecast it.
Stating a ratio changed without giving a reason.
Students stop after the calculation.
Fix: After every figure, add why. Link to scenario clues, for example a loan, a price cut or higher costs.
Comparing two businesses without checking their accounting policies.
The figures look comparable on the page.
Fix: Check depreciation methods, inventory valuation and whether assets were revalued before drawing a conclusion.
Treating one ratio as proof of good or bad performance.
Students want a simple verdict.
Fix: Look at related ratios together, such as profit margin with asset turnover, and compare against a base.
Ignoring that the statement of financial position is at one date.
Year-end figures are assumed to be typical.
Fix: For seasonal businesses or window dressing, state that year-end figures may not represent the average position.
Writing a vague limitation such as 'ratios are not accurate'.
Students do not learn the specific points.
Fix: Name the exact limitation and link it to the case, for example 'different depreciation policies make profit margins not comparable'.

Worked examples

Example 1

Company A depreciates equipment straight-line. Company B, a similar business, uses reducing balance. Both have the same revenue and the same cash costs. An analyst compares their net profit margins. Which limitation of ratio analysis is shown, and what is the effect?
A. Use of historic data
B. Differing accounting policies
C. Ignoring non-financial factors
D. Inflation

Show the solution

The two companies are similar but use different depreciation methods.
Different methods give different depreciation charges in a year, so reported profit differs even if the real performance is the same.
The margin difference therefore partly reflects the policy, not performance.
This matches the limitation of differing accounting policies, option B.
Options A, C and D are valid limitations in general but are not what the scenario describes.

Answer: B. Differing accounting policies make the profit margins not directly comparable.

Example 2

A retailer's gross profit margin fell from 40% to 35% this year. A director says this proves the business is badly managed. Write a short response covering how to interpret the change and one limitation.

Show the solution

State the fact: the margin fell by 5 percentage points, so the business keeps less gross profit from each $1 of revenue.
Give possible causes: selling prices cut, higher purchase costs, a change in sales mix, or inventory losses or errors in closing inventory.
Explain that the ratio shows a symptom. You need more information to find the cause, such as price lists and purchase costs.
Compare with the industry or competitors to see if the fall is business-specific or market-wide.
Limitation: the data is historic and ignores non-financial factors such as a planned strategy of lower prices to win market share, so the ratio alone cannot prove poor management.

Answer: The fall shows lower profitability on sales but not its cause. Investigate prices, costs and mix and compare with the industry. Because ratios use historic data and ignore non-financial factors, the fall alone does not prove poor management.

Exam tips

In objective questions, eliminate any option that says ratios give a complete or forward-looking picture.
For multiple response, select exactly the number asked and choose distinct limitations.
When comparing two businesses, check accounting policies first, then size and industry.
In scenario questions, tie every comment to a clue given, not a generic point.
Pair limitations with purpose: ratios help assess performance and position, but need a comparison base.

Practice questions from Ratios

Purpose and Limitations of Ratio Analysis in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Purpose and Limitations of Ratio Analysis: frequently asked questions

What is the main purpose of ratio analysis?

It helps users assess a business's performance and financial position by relating figures to each other. Ratios make it easier to compare over time, against other businesses and against targets.

What are the main limitations of ratio analysis?

The data is historic and often a year-end snapshot. Accounting policies can differ between businesses, inflation and window dressing distort figures, and non-financial factors are ignored. Ratios also show symptoms, not causes.

Why can't I compare two companies using ratios alone?

They may use different accounting policies, such as depreciation or inventory methods, and may differ in size, industry or year end. These differences can make the ratios misleading unless you adjust or allow for them.

How do I interpret ratios in an ACCA exam?

Calculate or read the ratio, compare it with a base, then explain the likely reason using the scenario. Finally check whether the comparison is fair.