What is working capital?
Working capital is the money a business has available to cover its short-term obligations and day-to-day running costs. It is calculated as the difference between current assets (cash, outstanding invoices, stock) and current liabilities (supplier bills, tax owed, short-term debt). A positive figure means the business can meet its immediate commitments. A negative figure signals a potential cash flow problem.
Quick example: a company with £5,000 in the bank and £4,000 owed by customers has current assets of £9,000. If it owes £2,000 to suppliers and £4,000 in VAT, current liabilities total £6,000. Working capital is £3,000.
Understanding this number matters because even profitable businesses can fail if they run out of cash at the wrong moment. UK SMEs are collectively owed over £27 billion in late payments at any given time, according to the British Business Bank, making access to working capital finance one of the most pressing issues facing small businesses. That is where working capital finance comes in.
What is working capital finance?
Working capital finance is any funding product designed to increase the cash available to a business in the short to medium term. Rather than funding a one-off asset purchase (that is what asset finance is for), working capital finance keeps operations moving, whether you need to bridge a gap between paying suppliers and receiving customer payments, fund a stock build ahead of a busy season or take on a larger contract that requires upfront investment.
It is particularly valuable for UK SMEs because growth itself consumes cash. Winning a bigger contract often means hiring staff, buying materials and covering overheads weeks or months before the client pays. Without adequate working capital, that growth opportunity can become a cash flow crisis.
How does working capital finance work?
The mechanics depend on the product, but the common thread is speed and flexibility. Most working capital facilities are designed to be arranged quickly and repaid within 12 months (or on a revolving basis). The lender assesses your trading history, cash flow patterns and, in some cases, the quality of your debtor book or the value of stock held.
Fundably simplifies this process by letting you complete a single application and receive matched offers from multiple lenders, so you can compare rates, terms and speed of funding in one place.
What types of working capital finance are available?
Overdrafts. Your bank allows you to draw beyond your account balance up to an agreed limit. Interest is charged only on the amount used, making this a flexible safety net for everyday cash flow fluctuations. However, overdrafts can be reduced or recalled at short notice, and rates have risen in recent years, so it is worth comparing alternatives.
Short-term business loans. A fixed lump sum repaid over three to 12 months (sometimes up to 24 months). Useful when you know exactly how much you need and when you can repay it, for example to fund a marketing campaign, cover a tax bill or bridge a gap while waiting for a large invoice to clear. Rates vary widely, so comparing business loan offers across lenders is important.
Invoice financing. If your business invoices other companies on 30, 60 or 90-day terms, invoice financing lets you draw a percentage of each invoice’s value (typically 80% to 90%) within 24 hours of issuing it. The lender collects the full amount from your customer and releases the balance, minus a small fee. This product comes in two main forms:
- Invoice factoring: the lender manages your sales ledger and collects payments on your behalf.
- Invoice discounting: you retain control of credit control and your customers are usually unaware of the arrangement.
For a deeper look at the mechanics, see our dedicated invoice finance guide.
Trade credit. Purchasing goods or services on account and paying the supplier at a later date. Supplier payment terms of 30 to 60 days are common in many industries and represent an informal, interest-free form of working capital finance. Some businesses also use supply chain finance platforms that let suppliers get paid early while the buyer retains extended terms.
When should a UK business use working capital finance?
Not every cash flow dip requires external funding, but there are clear situations where working capital finance adds real value:
- Seasonal demand. Retailers, hospitality businesses and agricultural firms often need to build stock months before peak trading. Finance bridges the gap between spending and earning.
- Winning larger contracts. A growing order book is positive, but it means higher upfront costs for labour, materials and overheads before revenue arrives.
- Late-paying customers. UK SMEs are owed billions in overdue invoices at any given time. Invoice financing turns those unpaid invoices into immediate cash.
- Tax or VAT bills. Quarterly VAT payments or an unexpected corporation tax liability can strain working capital. A short-term loan can spread the cost without penalties.
- Market uncertainty. Holding a cash buffer through a flexible facility like an overdraft or revolving credit line provides resilience during unpredictable trading conditions.
How much does working capital finance cost?
Costs depend on the product, the amount borrowed and your business profile:
- Overdrafts: variable interest (often 3% to 8% above base rate) plus an annual arrangement fee.
- Short-term loans: fixed or variable rates, typically 5% to 15% APR for established SMEs with good credit.
- Invoice financing: a combination of a service fee (0.5% to 3% of turnover) and a discount charge (similar to an interest rate) on drawn funds.
- Trade credit: usually free if you pay within the agreed terms, though early-payment discounts mean there is an implicit cost in not paying sooner.
The cheapest option on paper is not always the best fit. A slightly higher-rate facility that funds in 48 hours may be more valuable than a cheaper product that takes six weeks to arrange.
How Fundably helps you find the right working capital solution
Every business has different cash flow patterns, and a product that works for a recruitment agency billing weekly is unlikely to suit a manufacturer with 90-day payment cycles. Fundably gives you access to 50+ UK lenders through one short application, including iwoca and Funding Circle for short-term loans and revolving facilities, Triver for invoice finance, and Youlend for revenue-based and merchant cash advances. We match your trading data against the panel and surface the products most likely to be approved and competitively priced for your situation.
The initial matching uses a soft credit check, which does not affect your credit score and is not visible to other lenders. As a commercial finance broker and NACFB member, Fundably handles the comparison work so you do not have to chase multiple lenders yourself. The application takes around five minutes and you receive tailored feedback by email.
Ready to strengthen your cash flow?
Whether you need to cover a short-term gap, fund a growth opportunity or build resilience against late payers, working capital finance gives your business the breathing room to operate confidently. Apply through Fundably today and see which lenders are ready to support your business.