Working capital (abbreviated WC) is a financial metric which represents operating liquidity available to a business, organization or other entity, including governmental entity. Along with fixed assets such as plant and equipment, working capital is considered a part of operating capital. Net working capital is calculated as current assets minus current liabilities. It is a derivation of working capital, that is commonly used in valuation techniques such as DCFs (Discounted cash flows). If current assets are less than current liabilities, an entity has a working capital deficiency, also called a working capital deficit.
A company can be endowed with assets and profitability but short of liquidity if its assets cannot readily be converted into cash. Positive working capital is required to ensure that a firm is able to continue its operations and that it has sufficient funds to satisfy both maturing short-term debt and upcoming operational expenses. The management of working capital involves managing inventories, accounts receivable and payable, and cash.
Current assets and current liabilities include three accounts which are of special importance. These accounts represent the areas of the business where managers have the most direct impact:
- accounts receivable (current asset)
- inventory (current assets), and
- accounts payable (current liability)
The current portion of debt (payable within 12 months) is critical, because it represents a short-term claim to current assets and is often secured by long term assets. Common types of short-term debt are bank loans and lines of credit.
An increase in working capital indicates that the business has either increased current assets (that it has increased its receivables, or other current assets) or has decreased current liabilities—for example has paid off some short-term creditors.
Implications on M&A: The common commercial definition of working capital for the purpose of a working capital adjustment in an M&A transaction (i.e. for a working capital adjustment mechanism in a sale and purchase agreement) is equal to:
Current Assets – Current Liabilities excluding deferred tax assets/liabilities, excess cash, surplus assets and/or deposit balances.
Cash balance items often attract a one-for-one, purchase-price adjustment.
Working capital management 
Decisions relating to working capital and short term financing are referred to as working capital management. These involve managing the relationship between a firm's short-term assets and its short-term liabilities. The goal of working capital management is to ensure that the firm is able to continue its operations and that it has sufficient cash flow to satisfy both maturing short-term debt and upcoming operational expenses.
Decision criteria 
By definition, working capital management entails short-term decisions—generally, relating to the next one-year period—which are "reversible". These decisions are therefore not taken on the same basis as capital-investment decisions (NPV or related, as above); rather, they will be based on cash flows, or profitability, or both.
- One measure of cash flow is provided by the cash conversion cycle—the net number of days from the outlay of cash for raw material to receiving payment from the customer. As a management tool, this metric makes explicit the inter-relatedness of decisions relating to inventories, accounts receivable and payable, and cash. Because this number effectively corresponds to the time that the firm's cash is tied up in operations and unavailable for other activities, management generally aims at a low net count.
- In this context, the most useful measure of profitability is return on capital (ROC). The result is shown as a percentage, determined by dividing relevant income for the 12 months by capital employed; return on equity (ROE) shows this result for the firm's shareholders. Firm value is enhanced when, and if, the return on capital, which results from working-capital management, exceeds the cost of capital, which results from capital investment decisions as above. ROC measures are therefore useful as a management tool, in that they link short-term policy with long-term decision making. See economic value added (EVA).
- Credit policy of the firm: Another factor affecting working capital management is credit policy of the firm. It includes buying of raw material and selling of finished goods either in cash or on credit. This affects the cash conversion cycle.
Management of working capital 
Guided by the above criteria, management will use a combination of policies and techniques for the management of working capital. The policies aim at managing the current assets (generally cash and cash equivalents, inventories and debtors) and the short term financing, such that cash flows and returns are acceptable.
- Cash management. Identify the cash balance which allows for the business to meet day to day expenses, but reduces cash holding costs.
- Inventory management. Identify the level of inventory which allows for uninterrupted production but reduces the investment in raw materials - and minimizes reordering costs - and hence increases cash flow. Besides this, the lead times in production should be lowered to reduce Work in Process (WIP) and similarly, the Finished Goods should be kept on as low level as possible to avoid over production - see Supply chain management; Just In Time (JIT); Economic order quantity (EOQ); Economic quantity
- Debtors management. Identify the appropriate credit policy, i.e. credit terms which will attract customers, such that any impact on cash flows and the cash conversion cycle will be offset by increased revenue and hence Return on Capital (or vice versa); see Discounts and allowances.
- Short term financing. Identify the appropriate source of financing, given the cash conversion cycle: the inventory is ideally financed by credit granted by the supplier; however, it may be necessary to utilize a bank loan (or overdraft), or to "convert debtors to cash" through "factoring".
See also 
- Cash conversion cycle
- Working capital management
- Quick ratio analysis
- Sustainable growth rate