Liquidity ratios
Liquidity Ratios
A business can be profitable and still fail. If it cannot convert assets into cash quickly enough to meet its short-term obligations — paying wages, settling supplier invoices, servicing an overdraft — it faces a liquidity crisis, regardless of what its profit and loss account shows. Liquidity ratios measure the ability of a business to meet its short-term financial obligations using its short-term assets. Two ratios are required at IBDP Business Management: the current ratio and the acid test ratio.
Current ratio
The current ratio compares all current assets against all current liabilities. It indicates whether the business holds sufficient short-term assets to cover its short-term debts.
[ ext{Current ratio} = frac{ ext{Current assets}}{ ext{Current liabilities}} ]This formula is provided on the IB Business Management formulae sheet in the examination. Focus on applying it accurately and interpreting the result in context.
The result is expressed as a ratio — for example, 1.8:1 — meaning the business holds £1.80 of current assets for every £1.00 of current liabilities. As a guideline, a current ratio of around 2:1 is often cited as healthy for a manufacturing business, suggesting a comfortable liquidity buffer. However, this is a guideline, not a rule: the appropriate level depends on the nature of the business, the speed at which its current assets can be converted to cash, and the payment terms it operates. A ratio well above 2:1 may indicate excess stock or idle cash — inefficient use of working capital. A ratio below 1:1 suggests current liabilities exceed current assets, which is a warning sign of potential liquidity difficulty. Always verify the benchmark against the specific industry and business context before drawing conclusions.
Acid test ratio (quick ratio)
The acid test ratio — also called the quick ratio — is a more stringent measure of liquidity. It excludes stock (inventory) from current assets on the grounds that stock is the least liquid current asset: it must first be sold and payment collected before it becomes cash, which may take weeks or months.
[ ext{Acid test ratio} = frac{ ext{Current assets} - ext{Stock}}{ ext{Current liabilities}} ]This formula is provided on the IB Business Management formulae sheet in the examination. Focus on applying it accurately and interpreting the result in context.
As a guideline, an acid test ratio of around 1:1 is often considered adequate — suggesting the business can cover all current liabilities using its most liquid assets (cash, debtors, short-term investments) without needing to sell stock. A ratio below 1:1 means the business cannot cover its short-term obligations without liquidating stock, which may not be achievable quickly. Again, this guideline must be applied with caution: a supermarket typically operates well below 1:1 because its stock turns over very rapidly and it collects cash at the point of sale, so low acid test ratios are normal and not necessarily alarming. A manufacturing business with slow-moving stock and long debtor collection periods, by contrast, would face a genuine liquidity risk at the same ratio.
The relationship between the two ratios
The gap between the current ratio and the acid test ratio reveals the significance of stock as a component of current assets. A large gap — for example, current ratio 3.2:1 and acid test 0.9:1 — indicates that stock dominates current assets. If that stock is illiquid or slow-moving, the business is far less liquid than the current ratio alone would suggest. Examining both ratios together provides a much clearer picture of the true liquidity position.
Fenwick Ironworks Ltd manufactures specialist steel components for the construction industry. Its balance sheet at 30 September shows the following current items:
| Stock (raw materials and finished goods) | £384,000 |
| Debtors | £291,000 |
| Cash and cash equivalents | £43,000 |
| Total current assets | £718,000 |
| Trade creditors | £248,000 |
| Overdraft | £86,000 |
| Tax payable | £54,000 |
| Total current liabilities | £388,000 |
Current ratio:
[ ext{Current ratio} = frac{£718{,}000}{£388{,}000} = 1.85{:}1 ]Acid test ratio:
[ ext{Acid test} = frac{£718{,}000 - £384{,}000}{£388{,}000} = frac{£334{,}000}{£388{,}000} = 0.86{:}1 ]Interpretation: The current ratio of 1.85:1 appears reasonably healthy — below the 2:1 guideline but not alarming in isolation. However, the acid test of 0.86:1 reveals that once stock is excluded, Fenwick cannot cover its current liabilities from its most liquid assets alone. For a manufacturer whose stock consists of specialist steel components — which may take weeks to sell and months to collect payment on — this is a meaningful concern. The gap between the two ratios (1.85 vs 0.86) indicates that stock represents a very large proportion of current assets (£384,000 of £718,000 = 53%). If construction demand slows and stock movement stalls, Fenwick's liquidity position could deteriorate quickly. Management should monitor debtor collection periods and stock turnover closely.
What liquidity ratios do not tell us
Liquidity ratios are snapshots — they reflect the balance sheet position on a single date and may not represent the business's typical liquidity position. A business with highly seasonal sales may show excellent liquidity at year-end (after a peak trading period) but face cash shortages during quieter months. Ratios also do not reveal the quality of debtors (whether they will actually pay), the age of stock (whether it is saleable), or the terms on which creditors must be settled. A complete liquidity assessment requires both ratios alongside a cash flow forecast and analysis of working capital trends over time.
Key Takeaways
- The current ratio measures all current assets against all current liabilities; the acid test excludes stock as the least liquid current asset.
- Both formulas are on the IB formula sheet — apply them accurately and interpret results in context.
- As guidelines: current ratio around 2:1 and acid test around 1:1 are often considered healthy — but these are context-dependent benchmarks, not universal rules. Always verify against sector norms.
- The gap between the two ratios reveals how much of current assets is held as stock; a large gap warrants investigation of stock liquidity and turnover.
- A business can be profitable but face a liquidity crisis if it cannot convert assets to cash quickly enough to meet short-term obligations.
- Liquidity ratios are snapshots; they must be read alongside cash flow forecasts and working capital trends to form a complete picture.