Liquidity ratios

Liquidity is the ability of a business to pay its short-term debts (current liabilities) as they fall due (1), which depends on how easily its assets can be converted into cash (1).

The acid test ratio excludes inventory from current assets, whereas the current ratio includes it. Inventory is the least liquid current asset because it must first be sold — and, if sold on credit, then collected — before it becomes cash. By removing inventory, the acid test shows whether a firm can pay its short-term debts without relying on selling stock, which is important if stock sells slowly or in a downturn. It is therefore a tougher, more cautious test than the current ratio.

Liquidity is important because a business must be able to pay its short-term debts in cash as they fall due — wages, suppliers, rent and loan repayments. If it cannot, it is insolvent, and suppliers may stop supplying while lenders may call in their loans, which can force the business into liquidation even if it is otherwise sound.

Liquidity also matters because a firm can be profitable yet still fail if its cash is tied up in inventory and trade receivables — the danger of overtrading. Monitoring liquidity through the current and acid test ratios lets managers spot a cash squeeze early and act (e.g. chase receivables or arrange finance).

Therefore good liquidity is essential for survival: it keeps the business able to meet its obligations and trade normally, regardless of how profitable it is on paper.

With an acid test of 0.5:1, the firm can cover only half its current liabilities without selling inventory, so it needs to raise its liquid assets or cut its short-term debts.

The first method is to tighten credit control and chase trade receivables. Collecting outstanding invoices faster — through prompt invoicing, credit checks and chasing late payers — converts receivables into cash, directly raising the acid test ratio. The benefit is quick and cheap. However, if the firm also shortens the credit period it offers, price-sensitive customers may switch to rivals offering longer credit, so sales could fall.

The second method is to negotiate longer credit terms from suppliers (extend trade payables). Paying suppliers later keeps cash in the business for longer, easing the immediate squeeze without any borrowing. The drawback is that it may forfeit early-payment discounts and, if overdone, damage supplier relationships or even lead suppliers to demand cash on delivery.

Therefore both methods can lift the acid test, but each carries a commercial cost. The better choice depends on the cause of the problem: if customers are paying slowly, focus on credit control; if the firm has bargaining power over suppliers, extend payables. A combination, used carefully, would improve the cash conversion cycle without losing customers or suppliers.

On the surface, a current ratio of 2.5:1 looks comfortable — it suggests the firm has $2.50 of current assets for every $1 of current liabilities, well within the usual healthy range. Taken alone, it implies the firm can easily meet its short-term debts.

However, the acid test tells a different story. At 0.7:1, the firm can cover only 70% of its current liabilities once inventory is excluded. The large gap between the two ratios shows the firm's apparent liquidity rests almost entirely on inventory. If that stock is slow-moving or becomes obsolete, the firm could find itself unable to pay its debts — the current ratio is flattering the true position. So the firm may have a hidden liquidity weakness and is over-reliant on inventory, possibly because it is over-stocked.

The case that the position is acceptable. The 'right' acid test depends on the industry. A supermarket or fast-moving retailer routinely operates below 1:1 because it sells inventory for cash very quickly and buys on long credit, so a 0.7:1 acid test may be perfectly normal and not a cause for concern. If this firm sells stock rapidly, the high current ratio simply reflects a healthy, fast-moving inventory.

The case that action is needed. If the firm holds slow-moving or high-value stock, 0.7:1 is a warning. A high current ratio also raises a second issue: it may indicate inefficient use of resources — too much cash, inventory or uncollected receivables tied up rather than working. Either way, the firm should investigate why inventory is so high relative to its liquid assets and consider reducing it (selling slow lines), tightening credit control, or arranging short-term finance as a buffer.

Judgement (criterion). What these ratios suggest depends on the firm's industry and the speed at which it converts inventory to cash. For a fast-moving retailer, the position is probably acceptable and the firm should focus on whether the high current ratio means idle resources. For a firm with slow-moving stock, the weak acid test is a genuine warning that demands action — reducing inventory and improving the collection of receivables. The most defensible conclusion is that the firm should not rely on the reassuring current ratio: it must judge its liquidity by the acid test in the context of its industry, and act to reduce its dependence on inventory if its stock does not sell quickly.

Liquidity (the ability to pay short-term debts in cash) and profitability (the efficiency with which the firm earns profit) are both vital, but they can pull in opposite directions, so a firm cannot always maximise both at once. How far it should prioritise liquidity depends on its circumstances.

The case for prioritising liquidity. In the short term, liquidity is a matter of survival. A firm that cannot pay its wages, suppliers or loan repayments is insolvent, and persistent insolvency forces liquidation — at which point profitability is irrelevant because the business no longer exists. Many profitable firms fail not because they cannot make money but because they run out of cash, especially when overtrading: expanding sales tie up cash in inventory and receivables faster than it returns. A business in or near a cash crisis must therefore put liquidity first — holding cash, chasing receivables and arranging finance — even at the expense of some profit. As the saying goes, 'cash is king' in a downturn.

The case for prioritising profitability. In the longer term, profitability is the reason the business exists and the ultimate source of cash. A firm obsessed with liquidity — hoarding cash, holding minimal inventory, refusing customers credit — may sacrifice profitable opportunities: idle cash earns little, refusing credit loses sales, and under-stocking causes stock-outs. Excess liquidity is itself inefficient (a very high current ratio signals idle resources). Without profit there is no retained earnings, no return for investors and, eventually, no liquidity either, because profit is what replenishes cash over time. A healthy, growing firm should therefore prioritise profitability while keeping liquidity adequate.

Weighing it up (criterion). The right priority depends on the firm's financial situation and time horizon. Where the firm faces an immediate cash shortage or is overtrading, liquidity must come first — survival outranks everything. Where the firm is financially stable with adequate liquidity, it should prioritise profitability, since that is what creates long-term value and ultimately sustains liquidity. The two are not really opposites over time: profit generates cash, and adequate liquidity allows the firm to keep trading to earn that profit.

Judgement. A business should prioritise improving liquidity over profitability only when its short-term solvency is genuinely at risk — in a cash crisis, survival must come first. In normal conditions, however, the goal is balance: maintain enough liquidity to meet obligations comfortably, but not so much that resources sit idle, while focusing on profitability to create the value and the future cash the firm depends on. The most defensible conclusion is that liquidity is the short-term priority and profitability the long-term one — the firm should manage both, tilting toward liquidity only when survival is threatened.