The Complete Guide to Invoice Finance for UK Businesses (2026)

What is invoice finance and how does it work?

Invoice finance allows B2B businesses to access cash tied up in outstanding invoices before their customers pay. Instead of waiting 30, 60 or 90 days for payment, you receive an advance (typically 70-90% of the invoice value) within 24-48 hours of raising the invoice. The remaining balance, less fees, is paid when your customer settles.

The finance facility grows automatically with your business. As your sales ledger increases, so does the funding available. This makes invoice finance structurally different from a business loan, which is a fixed amount agreed at a point in time. Invoice finance is self-liquidating and revolving, making it particularly suited to businesses with seasonal revenue or rapid growth.

The UK invoice finance market is substantial. Industry association UK Finance estimates that around 45,000 UK businesses currently use some form of invoice finance, with total outstanding advances exceeding £20 billion. The market has evolved significantly with specialist fintech providers now offering single-invoice funding and near-instant credit decisions through open banking integrations.

Invoice factoring vs invoice discounting: what is the difference?

Invoice factoring (also known as debt factoring) means the finance provider takes over the management of your sales ledger and collection of payments from your customers. Your customers will know you are using a factoring facility, as they will receive payment requests from the factor rather than directly from you. This is a disclosed facility. The factor's credit control team chases payment, which removes an administrative burden but also means your customer relationships are partly managed by a third party.

Invoice discounting is a confidential facility. You retain control of your own credit control and customer relationships. Your customers continue to pay your bank account as normal, and you draw down advances against the sales ledger from a separate funding account. Invoice discounting is typically available to more established businesses with a proven credit control function, as the lender relies on you to collect the debts.

Selective invoice finance (also called spot factoring) allows you to finance individual invoices on a transaction-by-transaction basis, without committing your whole ledger to a facility. This suits businesses with occasional large invoices or those testing invoice finance before committing to a full facility. Single invoice facilities have higher fees but no minimum volume commitments.

Costs: service fees, discount charges, and what to watch for

Invoice finance is priced using two separate charges. The service fee (sometimes called the administration fee) covers the provider's costs of managing the ledger and is charged as a percentage of your annual turnover, typically 0.5-2.5% depending on the volume, complexity and type of facility. The discount charge is the interest cost on the advances drawn and is expressed as a percentage above a base rate (typically Bank of England base rate plus 2-4%), applied on a daily basis to the balance drawn.

Additional costs to check include: bad debt protection (credit insurance against customer insolvency, typically 0.5-1% of insured turnover), minimum annual fees (some providers charge a minimum regardless of volume), concentration limits (extra charges if one customer represents more than 25% of your ledger), and termination fees if you exit before the contract minimum period.

Always calculate the effective annual cost as a percentage of the cash you actually receive. A 1% service fee on £2 million annual turnover is £20,000, plus discount charges on any advances drawn. Model both the cost and the cash flow benefit before deciding whether the facility makes commercial sense for your business.

Eligibility: who can access invoice finance?

Invoice finance is specifically designed for B2B businesses that invoice other businesses or public sector organisations on credit terms. It does not suit businesses that take payment immediately at point of sale, businesses that invoice consumers, or businesses whose invoices are disputed frequently.

Most invoice finance providers require a minimum annual turnover of £100,000-£250,000, though specialist lenders including some on the Spark Finance panel will consider smaller ledgers on a selective invoice basis. Businesses in recruitment, manufacturing, construction, professional services, logistics, and healthcare are particularly well-served by the market.

The quality of your debtors matters. Lenders want to see invoices raised against creditworthy customers, preferably with a spread across multiple customers rather than heavy concentration in one. Businesses with customers in financial difficulty or a history of disputed invoices will face stricter advance rates or may be declined.

How to switch invoice finance providers

If you are already using invoice finance but feel your rates are uncompetitive, switching is more straightforward than many business owners assume. Most facilities have a notice period (commonly 90 days, though some are shorter). During the notice period, you can instruct Spark Finance to approach alternative providers and obtain competing offers.

When switching, the new provider will want to review your existing facility performance: the advance rate achieved, any bad debts or concentration issues, and the health of your sales ledger. Clean ledger performance makes switching smoother and typically secures better rates. Speak to Spark Finance three to six months before your contract renewal date to allow enough time to compare properly.