Working Capital: What It Is and How to Finance It

Working capital is the capital available to a business for its day-to-day operations - the cash and near-cash assets the business can deploy to pay wages, suppliers, rent, and other running costs while waiting for customers to pay. The basic formula is: Working Capital = Current Assets minus Current Liabilities. Current assets include cash in the bank, trade debtors (money customers owe you), and stock. Current liabilities include trade creditors (money you owe suppliers), short-term loans, and accrued expenses.

A positive working capital balance means the business has more short-term assets than short-term liabilities - a healthy position. A negative working capital balance means short-term liabilities exceed short-term assets - which can indicate a cash flow crisis, or in some sectors (notably supermarket retail) can simply reflect a business model where customers pay immediately but suppliers are paid on extended terms.

The working capital ratio (also called the current ratio) divides current assets by current liabilities. A ratio of 2.0x means the business has twice as many current assets as current liabilities - generally considered comfortable. A ratio of 1.0x-1.5x is acceptable but leaves less buffer. A ratio below 1.0x suggests the business may struggle to meet short-term obligations if all liabilities fell due simultaneously. Most lenders look for a working capital ratio of at least 1.25x as a minimum threshold for unsecured lending.

The cash conversion cycle (CCC) measures how long cash is tied up in the business's operating cycle - from the moment it is paid out to suppliers or for production costs to the moment it is received back from customers. CCC = Debtor Days + Inventory Days minus Creditor Days.

A business with 45-day debtor terms, 20 days of inventory, and 30-day creditor terms has a CCC of 35 days (45 + 20 minus 30). This means, on average, 35 days of revenue is tied up in the operating cycle at any given time. For a business with £500,000 annual revenue, that represents approximately £48,000 of working capital permanently committed to the cycle.

Extending the CCC - slower-paying customers, more inventory, faster-paying suppliers - directly increases the working capital requirement. Compressing it - accelerating customer payment, reducing inventory, extending supplier terms - reduces it. Working capital finance effectively shortens the CCC by providing cash against the assets trapped within it.

The most common working capital problems are: rapid revenue growth (growing faster than cash flow can self-fund - the 'overtrading' risk); slow-paying customers extending debtor days beyond sustainable levels; large one-off payments coinciding with routine cash commitments (HMRC, rent review, insurance renewal); seasonal businesses needing capital ahead of the peak season; and businesses winning large contracts that require upfront expenditure before the first payment is received.

Invoice Finance - Best for Debtor-Driven Gaps. If the working capital problem is caused by slow-paying customers - high debtor days - invoice finance is the most targeted solution. It releases 80-90% of invoice value within 24 hours of raising the invoice, effectively reducing debtor days to near zero from the business's cash flow perspective. The facility scales automatically with revenue, making it the most self-correcting working capital product.

Revolving Credit Facility - Best for Recurring Gaps. A revolving credit facility provides a flexible line that can be drawn and repaid repeatedly during its term. Ideal for businesses with recurring, predictable working capital cycles - where cash needs to bridge a gap that closes and opens regularly. Unlike a term loan, a revolving facility does not need to be reapplied for each time - draw and repay within the agreed limit and term.

Merchant Cash Advance - Best for Card Revenue Businesses. For businesses generating most of their revenue through card payments, the MCA's automatic revenue-linked repayment is structurally well suited to working capital support. Funds can be in the account within 24 hours, and repayment flexes automatically with trading conditions.

Stock Finance - Best for Inventory-Driven Gaps. When the working capital problem is driven by inventory - needing to purchase stock before it can be sold - a revolving stock finance facility funds the purchase cycle and revolves as goods are sold. Particularly effective for retailers and wholesalers with high stock-to-revenue ratios.

Working Capital Term Loan - Best for One-Off Gaps. For a one-off working capital shortfall - a specific cash pressure with a defined resolution - a short-term unsecured business loan provides a lump sum repaid over 3-24 months. Less flexible than a revolving facility but simpler and potentially cheaper for a defined, time-limited need.

The most important principle in working capital finance is to match the solution to the cause of the problem. A revolving credit facility treating a debtor problem will be less effective than invoice finance because the revolving limit does not scale with the invoicing volume. A term loan treating a recurring seasonal gap will need to be taken out annually rather than revolving automatically.

Diagnosis before prescription - understanding the specific driver of the working capital gap - is the difference between a finance solution that genuinely solves the problem and one that merely defers it. Our working capital calculator helps diagnose the nature of your gap and recommends the most appropriate facility type.