There is a particular kind of stress that comes not from losing work, but from winning it. You land a contract, the team is buzzing, and then you do the maths on when the money actually arrives versus when you have to pay staff and suppliers. That gap is what working capital finance is designed to bridge.

This guide explains what working capital is, why public-sector contracts in particular can strain it, and the main funding options available to UK small businesses in 2026, with the honest pros and cons of each.

This article is general information, not financial advice. Finance products, rates and eligibility change, and the right choice depends on your circumstances. Check current terms with the provider and consider speaking to an accountant or qualified adviser, and confirm any tax or regulatory points on GOV.UK, before making a decision.

What working capital actually means

Working capital is simply the money your business has available to cover day-to-day running costs: wages, rent, stock, materials, fuel, VAT. In accounting terms it is current assets minus current liabilities, but you do not need the formula to feel it. If you have plenty of cash sitting ready to meet the next few weeks of bills, your working capital is healthy. If most of your money is tied up in unpaid invoices or stock you have bought but not yet sold, it is tight, even if the business is profitable on paper.

That last point trips up a lot of owners. Profit and cash are not the same thing. A company can be growing, winning work and still run out of money simply because the timing of money in and money out does not line up.

Why public-sector contracts can squeeze your cash

Public contracts are attractive precisely because the buyer is reliable and the work can run for years. But the cash dynamics are demanding. You often have to mobilise first, hiring people, buying kit, taking on premises, before you raise a single invoice. Then you invoice in arrears and wait for payment.

The public sector has prompt-payment commitments, but in practice money can take weeks to land, and prime contractors do not always pass speed down the chain. Our guide to public-sector payment terms and prompt payment rules sets out what you are entitled to and how to chase it. In the meantime, the cash gap is yours to fund, and getting on top of it starts with solid cash flow management.

A contract you cannot fund the delivery of is not an opportunity; it is a liability with a nice logo on the letterhead.

Overdrafts and revolving credit facilities

The most flexible options are an overdraft or a revolving credit facility. Both give you an agreed limit you can dip into and repay as you like, paying interest only on what you use. They suit short, unpredictable gaps, the kind where you need £15,000 for ten days, then nothing for a month.

The trade-offs: arranged overdrafts have become harder for small firms to secure from high-street banks, limits can be lower than you would like, and the facility is usually repayable on demand, which means a nervous bank can withdraw it at an awkward moment. Revolving credit facilities from specialist lenders fill some of that gap but often cost more.

Invoice finance: turning unpaid invoices into cash

If your cash is locked up in invoices to creditworthy customers, invoice finance is often the most natural fit. A lender advances you a large slice of an invoice's value, frequently 80 to 90%, within a day or two of you raising it, then releases the rest (minus their fee) when the customer pays.

It scales with your sales, which is helpful when a public contract suddenly grows your turnover, and public-sector debtors are exactly the kind of low-risk customer lenders like. The flip side is cost and, with some products, the customer being aware of the arrangement. We cover the mechanics, the difference between factoring and discounting, and what it really costs in our deep dive on invoice finance for small businesses.

Trade finance and asset finance for the lumpy costs

Some cash strains are not about waiting for invoices at all; they are about big upfront purchases. Two tools help here.

  • Trade finance funds the gap between paying a supplier (often overseas) and getting paid by your customer. It is useful when you need to buy stock or materials in bulk to fulfil an order you have already won.
  • Asset finance spreads the cost of equipment, vehicles or machinery over its useful life, so a single contract does not force a five-figure outlay in one month. Our guide to asset finance and equipment leasing explains hire purchase versus leasing and when each makes sense.

Used well, these keep your general working capital free for wages and overheads rather than sinking it into kit.

How to choose, and what lenders look at

Match the finance to the shape of the gap. Short, unpredictable wobbles suit an overdraft or revolving facility. A steady stream of unpaid invoices suits invoice finance. A one-off equipment purchase suits asset finance. Many growing firms end up with a small stack of these rather than one product.

Before applying, get three things in order: up-to-date management accounts, a realistic cash-flow forecast, and a clear story about the contract that is driving the need. Lenders are reassured by a named, creditworthy customer and a forecast that shows you can repay. Going in with “we are a bit short” gets a worse answer than “we have won a £180,000 council contract, here is the mobilisation cost and the payment schedule, here is the gap.”

It also helps to only chase work you can realistically fund. Before you commit to a tender, knowing the contract value and payment profile up front lets you plan the finance alongside the bid rather than scrambling afterwards.

Frequently asked questions

What is the difference between working capital finance and a normal business loan?

A term loan gives you a lump sum you repay over a fixed period, which suits a known, one-off cost. Working capital finance is usually flexible and short-term, designed to smooth the ongoing gap between money going out and money coming in. Many businesses use both for different purposes.

Will winning a public-sector contract make it easier to get finance?

Often, yes. A signed contract with a creditworthy public buyer is strong evidence of future income, and some lenders offer contract-backed or invoice finance specifically against it. Bring the contract and a payment schedule to any application; it strengthens your case considerably.

Is working capital finance expensive?

It varies enormously by product, lender and your credit profile. Overdrafts and invoice finance are charged differently, so compare the total cost over the period you will actually use the money, not just the headline rate. Always read the fee structure, as arrangement and service fees can outweigh the interest.

Getting your funding lined up early means you can bid for bigger, longer contracts with confidence rather than fear. When you are ready to find the work worth funding, search live UK public-sector tenders on Tendarix and plan the cash flow before you commit.