Working capital

Working Capital

A business needs two kinds of capital: long-term capital to fund its non-current assets (introduced in Sections 3.2 and 3.4), and short-term capital to fund its day-to-day operations. This short-term operational capital is called working capital. Without adequate working capital, a business cannot pay its wages, restock its shelves, or settle its supplier invoices — regardless of how profitable it is or how many long-term assets it holds.

What is working capital?

Working capital was introduced in Section 3.4 as the arithmetic difference between current assets and current liabilities:

Positive working capital means the business holds more short-term assets than short-term liabilities — it has a liquidity buffer. Negative working capital means current liabilities exceed current assets, signalling potential difficulty meeting short-term obligations. The working capital figure on the balance sheet is a snapshot — in practice, the components of working capital are constantly moving through the working capital cycle.

The working capital cycle

The working capital cycle (also called the cash conversion cycle) describes the flow of cash through the business's short-term assets as it trades:

1. Cash is used to purchase raw materials or goods from suppliers.
2. Raw materials become stock (work-in-progress and finished goods).
3. Stock is sold to customers — either for immediate cash (shortening the cycle) or on credit, creating debtors.
4. Debtors pay their invoices, converting back to cash and completing the cycle.

The length of the working capital cycle — the time it takes for cash spent on inputs to return as cash collected from customers — determines how much working capital the business needs. A business with a long cycle (slow stock turnover and slow debtor collection) needs substantially more working capital than one with a short cycle. Trade credit from suppliers (the creditors box in the diagram) reduces the cash outflow associated with purchasing stock, effectively shortening the effective cycle.

Causes of working capital problems

Working capital problems arise when the inflow of cash through the cycle is insufficient or too slow to meet obligations as they fall due. Common causes include:

Over-trading. Rapid growth requires more stock, more debtors, and more immediate payments to suppliers — but the cash to fund this expansion may not arrive from sales quickly enough. A business that expands faster than its working capital base can support will run into cash flow difficulties despite strong revenue growth.

Slow debtor collection. If customers are taking longer to pay — either because credit terms are generous or because credit control is weak — cash is tied up in debtors rather than available for use. Rising debtor days (as examined in Section 3.6) is a direct symptom of this problem.

Excessive stock holding. Ordering too much stock, or holding slow-moving product lines, locks cash in the warehouse. This is particularly acute for businesses with seasonal demand: ordering in anticipation of a peak season that disappoints leaves the business holding large stock balances funded by cash that cannot be recovered until the stock is sold.

Unexpected costs or revenue shortfalls. An unplanned capital expenditure, a sudden drop in sales, or a large bad debt write-off can all rapidly deplete working capital that was adequate before the event.

Seasonal trading patterns. Many businesses face months in which cash outflows (paying staff, restocking) substantially exceed inflows (low sales periods). Without adequate working capital or credit facilities to bridge seasonal troughs, even a profitable annual business can face monthly cash crises.