What is Working Capital?

Working capital is the difference between a company’s current assets and its current liabilities. It represents the short-term financial resources available to fund day-to-day operations and is one of the most important indicators of a company’s operational health and liquidity.

Working capital = Current assets - Current liabilities

Section 1: Understanding the Components

1.1 Current Assets

Current assets are resources expected to be converted into cash within 12 months:

1.2 Current Liabilities

Current liabilities are obligations due for settlement within 12 months:

1.3 Example Calculation

This company has positive working capital of £125,000, meaning it has sufficient short-term resources to cover its short-term obligations.

Section 2: Why Working Capital Matters

2.1 Operational Continuity

A business needs working capital to:

• Pay suppliers for raw materials and goods
• Meet payroll obligations
• Cover rent, utilities and other recurring costs
• Fund the gap between paying for inputs and collecting revenue from customers

Without adequate working capital, a business may be unable to operate even if it is profitable on paper.

2.2 Relationship to Profit

A common misconception is that profitable businesses always have sufficient cash. Under accrual accounting , the income statement can show a profit while the business is short of cash. This typically happens when:

• Customers are slow to pay (receivables growing)
• The business is building inventory ahead of sales
• Significant capital expenditure has been funded from working capital

The cash flow statement reveals how working capital changes affect actual cash generation.

2.3 Lender and Investor Scrutiny

Banks and investors closely monitor working capital as part of their due diligence. A business with consistently negative or declining working capital may struggle to secure financing. Working capital ratios are frequently included in banking covenants (see financial ratios ).

Section 3: The Working Capital Cycle

The working capital cycle (also called the cash conversion cycle) measures the number of days between paying for inputs and receiving cash from customers.

Working capital cycle = Inventory days + Receivables days - Payables days

3.1 Example

This means the business must fund 50 days of operating costs from its own resources before cash from sales is collected. A shorter cycle means less cash is tied up in operations.

3.2 Industry Variations

Working capital cycles vary enormously by industry:

Section 4: Managing Working Capital

4.1 Receivables Management

Strategies to reduce receivables days:

• Invoice promptly as soon as goods are delivered or services completed
• Set clear payment terms (e.g., 30 days) and communicate them on every invoice
• Send reminders before and after the due date
• Offer early payment discounts (e.g., 2% discount for payment within 10 days)
• Credit check new customers before extending credit
• Use factoring or invoice discounting to accelerate cash collection

4.2 Inventory Management

Strategies to reduce inventory days:

• Demand forecasting to avoid overstocking
• Just-in-time (JIT) purchasing to minimise stock holding
• Regular stock reviews to identify slow-moving or obsolete items
• Negotiate supplier lead times to reduce the need for safety stock
• Drop-shipping where feasible to eliminate stock holding entirely

4.3 Payables Management

Strategies to optimise payables:

• Use full payment terms offered by suppliers without paying early unnecessarily
• Negotiate longer terms with key suppliers where possible
• Avoid stretching too far as this can damage relationships and credit ratings
• Centralise payments to improve control and timing
• Take advantage of early payment discounts when the implied interest rate exceeds borrowing costs

4.4 Cash Management

• Maintain a cash flow forecast updated weekly or monthly
• Keep adequate cash reserves or an available overdraft facility
• Sweep excess cash into interest-bearing accounts
• Monitor the bank balance daily and investigate unexpected movements

Section 5: Working Capital Ratios

5.1 Current Ratio

Current ratio = Current assets / Current liabilities

A ratio of 1.5 to 2.0 is generally considered healthy, though the ideal level depends on the industry. A ratio below 1.0 means current liabilities exceed current assets, which may indicate a liquidity problem.

5.2 Quick Ratio

Quick ratio = (Current assets - Inventory) / Current liabilities

By excluding inventory (which may be slow to sell), the quick ratio provides a more conservative view of liquidity. A quick ratio above 1.0 is generally considered adequate.

5.3 Working Capital Turnover

Working capital turnover = Revenue / Average working capital

This measures how efficiently the business uses its working capital to generate revenue. A higher ratio indicates greater efficiency.

For a full discussion of these and other ratios, see our article on financial ratios .

Section 6: Negative Working Capital

6.1 When It Is a Problem

Negative working capital (current liabilities exceeding current assets) is concerning when:

• The business cannot pay suppliers or employees on time
• Bank overdrafts are at their limit
• HMRC tax liabilities are overdue
• The business relies on a single large customer whose payment could be delayed

6.2 When It Is Normal

Some businesses normally operate with negative working capital:

• Supermarkets collect cash immediately from customers but pay suppliers on 60-90 day terms
• Subscription businesses receive payment upfront but deliver services over time
• Airlines sell tickets weeks before the flight, creating large deferred income

In these cases, negative working capital reflects a strong cash generation model rather than financial distress.

Section 7: Working Capital and the Balance Sheet

Working capital is derived directly from the balance sheet . The balance sheet shows:

• Current assets and current liabilities at the reporting date
• The working capital position at that specific point in time

However, balance sheet working capital is a snapshot. A business with healthy working capital on 31 March may have experienced cash pressure in February if a major payment fell in that month. Regular monitoring throughout the year is essential.

Section 8: Working Capital Financing

When a business needs to fund its working capital cycle, several options are available:

The choice of financing depends on the business’s size, industry and the nature of its working capital needs. Each option has implications for the balance sheet and cash flow statement .

Section 9: Working Capital and the Audit

During the audit , auditors pay close attention to working capital because:

• Inventory valuation requires testing to confirm existence and correct pricing
• Trade receivables must be assessed for recoverability, with appropriate bad debt provisions
• Accruals and provisions within current liabilities require evidence and judgement
• Cut-off procedures verify that transactions are recorded in the correct period
• The going concern assessment depends heavily on whether the business has sufficient working capital to continue operating

Effective working capital management is one of the most practical and impactful aspects of running a UK business. It connects directly to the accounting fundamentals that underpin all financial reporting.