Limitations of interpretation techniques: formula sheet

Key formulas

Core idea: ratio

Ratio = Figure A ÷ Figure B

Only meaningful when A and B are defined consistently and compared with a benchmark.

Comparators for a ratio

Prior years | competitors | industry average | budget or target

A single ratio with no comparator has little meaning.

Key limitations checklist

Historical | snapshot/window dressing | policies differ | no context | inflation | non-financial ignored | definitions differ

Use as a memory list, then link each point to the scenario.

Comparability test

Like-for-like comparison = same policies + same estimates + same period + similar structure

If any element differs, say so and explain the effect on the ratio.

Revaluation effect on ROCE

ROCE = profit before interest and tax ÷ (total assets − current liabilities) × 100%

Revaluing assets raises capital employed and depreciation, so ROCE usually falls compared with an entity using cost.

Asset turnover

Asset turnover = revenue ÷ capital employed

An entity with older, heavily depreciated assets at cost looks more efficient than one with revalued or new assets.

Gearing

Gearing = debt ÷ equity, or debt ÷ (debt + equity)

Revaluation raises equity and lowers gearing. Use the same version of gearing for both entities.

Change in policy

IAS 8: apply retrospectively and restate comparatives

A change in estimate is prospective, so it is not restated.

Real growth (approximate)

Real growth % ≈ Nominal growth % − Inflation %

Quick estimate for small rates. Use it to see whether growth is real.

Real growth (exact)

(1 + nominal growth) ÷ (1 + inflation) − 1

Use when rates are large or the question asks for precision.

Restating to current prices

Amount × (Index at end ÷ Index at date of amount)

Brings an old figure to current price levels so years can be compared.

Return on capital employed

ROCE = Profit before interest and tax ÷ (Total assets − Current liabilities) × 100

Overstated when assets are held at old, low historical cost.

Limitation answer pattern

Limitation + Why it matters here + Extra information needed

Use this three-part structure for each point so each earns its mark.

Seasonality check

Year-end figures ≠ average figures

Year-end balances may not represent the position during the year; use averages or interim data where available.

Comparability condition

Same policies + same year end + same size and sector = fair comparison

If any condition fails, state it as a limitation of the comparison.

Quick revision

• Ratios are indicators, not answers. They show where to look and need explanation.
• A single ratio means little without a comparator such as prior years, a competitor or the industry.
• Year-end figures may not represent the year, especially with seasonal trade or window dressing.
• Financial statements use estimates and judgements, such as useful lives and provisions, which affect ratios.
• Different accounting policies, such as cost versus revaluation or depreciation methods, reduce comparability.
• Ratio definitions vary between companies and data providers, so use the same formula for every entity.
• Historical cost shows old values, so assets look low and profit and return look high in inflation.
• Inflation distorts trend analysis, because later-year figures are in money of lower purchasing power.
• Financial statements are backward-looking and give little on future prospects.
• Non-financial information, such as customer satisfaction, staff turnover and market position, is missing from the statements.
• Companies in different industries or countries may not be comparable, even with the same policies.
• Always tie the limitation to the scenario and state its effect on the conclusion.

Common mistakes

• Listing generic limitations with no link to the scenario. Fix: Use each scenario fact as a hook. Write 'Because X, the ratio may be Y'.
• Saying ratios are useless. Fix: Say ratios are a useful starting point but need context and further information.
• Saying the entity with the better ratio is the better performer Fix: First check whether policies and estimates match. If not, say the ratios are not directly comparable.
• Getting the direction of a revaluation wrong Fix: Write out the effect: higher assets, higher equity, higher depreciation, lower profit. ROCE and gearing both fall.
• Treating nominal growth as real growth. Fix: Always deduct the inflation rate before commenting on growth.
• Saying inflation lowers ROCE. Fix: Under historical cost, assets are understated, so ROCE and asset turnover look higher. Say it overstates returns.
• Listing generic limitations that ignore the scenario. Fix: Choose only points supported by clues in the question and refer to them.
• Saying financial statements are useless or unreliable. Fix: Say they are useful but incomplete, and explain which decision is affected.

Exam tips

• Read the scenario for hints such as different year ends, recent revaluations or seasonal trading. They point to the limitation the examiner wants.
• Always give the effect on the ratio, not just the name of the limitation.
• In objective tests, reject options that say ratios give a complete or fully reliable picture.
• In written answers, finish with a short balanced conclusion and suggest further information needed.
• Keep points short and separate so each earns a mark.
• Name the specific policy or estimate in the scenario, then state its effect on the ratio. Generic answers earn little.
• In objective questions, work out the direction of the effect before looking at the options. A wrong direction is a common trap.
• In written answers, finish with what extra information you would request, such as policy notes or interim figures.