What does a ratio actually tell us, and what are the limits of using ratios?
Interpret ratios by comparison and explain the limitations of ratio analysis
A simple answer to the N(A)-Level Principles of Accounts outcome on interpreting ratios. Why ratios must be compared, how to explain a change, and the main limitations of ratio analysis.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
SEAB wants you to interpret ratios by comparison and to explain the limitations of ratio analysis. Calculating a ratio is the easy part; the marks are in saying what it means and knowing what it cannot tell you. The central insight is that a ratio is meaningless on its own: it only becomes useful when compared, and even then it has real limits.
The answer
Ratios need a comparison
A single ratio is just a number. To judge it, compare it against:
- Previous years (is performance improving or worsening?).
- A budget or target (did the business meet its plan?).
- Similar businesses (how does it compare with competitors?).
Without a comparison, you cannot say whether a ratio is good or bad.
Explain the change, do not just report it
When a ratio changes, the marks come from explaining why. For example, a falling gross profit margin suggests lower prices or higher cost of goods; a rising current ratio might mean inventory is building up. Always link the number to a cause and a possible action.
The limitations of ratio analysis
| Limitation | Why it matters |
|---|---|
| Based on past data | Ratios look backward, not forward |
| Ignore non-financial factors | Staff, reputation and the economy are not captured |
| Different accounting methods | Two firms may not be comparable |
| Distorted by one-off events | A single unusual item can mislead |
| Need context | A ratio alone says little without comparison |
Putting it together
Ratios are a useful starting point for analysis, but they are not the whole story. A good answer uses them to ask better questions, not to give a final verdict.
Examples in context
Example 1. The same ratio, two stories. A current ratio of is reassuring for a business whose competitors sit at , but worrying for one whose own ratio was last year. The number is identical; only the comparison gives it meaning. This shows why an answer that just states a ratio, without comparing it, earns few marks.
Example 2. The limits of a good ratio. A business reports strong margins, but the figures are a year old, and since then a major customer has left and a new competitor has opened nearby. The ratios still look healthy, yet they miss these non-financial threats. This illustrates why ratios should prompt further questions rather than settle the judgement on their own.
Try this
Q1. State two things a ratio can be compared against to make it meaningful. [2 marks]
- Cue. Previous years and similar businesses (or a budget or target).
Q2. A business's profit margin fell this year. State what a good answer must do beyond reporting the fall. [2 marks]
- Cue. Explain why it fell (for example, rising expenses or lower prices) and suggest what the business could do about it.
Q3. Explain one reason why comparing two businesses' ratios can be misleading. [2 marks]
- Cue. They may use different accounting methods, such as different depreciation methods, so their figures are not on the same basis and are not directly comparable.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original6 marksA business's current ratio rose from to in one year. (a) Suggest two reasons this might have happened. (b) Explain why a higher current ratio is not always a good sign.Show worked answer →
(a) Two possible reasons:
The business built up a lot of inventory that has not yet sold.
Trade receivables rose because customers are taking longer to pay, or cash piled up because it was not invested.
(b) A higher current ratio is not always good because it may mean resources are idle: too much inventory tying up cash, slow-paying customers, or cash sitting in the bank earning nothing. The business might use those resources more profitably.
What markers reward: two sensible reasons for the rise, and explaining that a very high ratio can signal idle or poorly used resources rather than strength.
Original5 marksState three limitations of using ratios to judge a business's performance.Show worked answer →
Any three of:
Ratios use past figures, so they may not reflect the current or future position.
They ignore non-financial factors such as staff quality, reputation, or the state of the economy.
Comparisons can mislead if businesses use different accounting methods (for example, different depreciation methods).
A single ratio means little on its own; it needs something to compare against.
Figures can be distorted by one-off events or by the choice of year end.
What markers reward: three distinct, valid limitations, such as reliance on past data, ignoring non-financial factors, and differences in accounting methods.
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