Top 10 £600,000 Invoice Finance Lenders in the UK 2026

Invoice finance lets you borrow against your unpaid customer invoices rather than waiting for them to be settled. A specialist lender advances you a percentage of each invoice value — typically up to 90% — within 24 to 48 hours of raising it. You retain control of your sales ledger with invoice discounting, or the lender manages collections for you under factoring. The remaining balance, minus a small service fee, is released once your customer pays. A £600,000 facility gives you headroom to draw funds as and when you need them, making it ideal for businesses with strong sales but slow-paying clients.

Eligibility typically hinges on your sales ledger quality rather than your balance sheet. Lenders will review the creditworthiness of your debtors, the average invoice value, payment terms, and your historic collection performance. Most providers expect you to trade B2B or B2G on standard credit terms, with a minimum annual turnover that aligns with the facility size — a £600,000 line usually requires turnover well into the millions. Your business should be UK-registered with a clean trading history. Startups and businesses with poor credit may still qualify if their debtor book is strong, though terms may be adjusted accordingly.

Invoice finance costs generally break down into two components: a service fee, which covers admin and collections and is often charged as a percentage of turnover, and a discount charge applied to drawn funds, similar to interest on an overdraft. Rates vary by provider, the volume and quality of invoices, debtor concentration, and sector risk. Facilities are typically structured on a rolling 12-month basis with annual review. A £600,000 line may be offered as a whole turnover facility covering your entire debtor book, or as selective invoice finance for individual large invoices. Always ask for a clear breakdown of all fees before committing.

Both offer flexible access to working capital, but the key difference is the asset being leveraged. Invoice finance is tied directly to your unpaid invoices — the facility grows as your sales grow. A revolving credit facility is typically secured against a broader asset pool such as stock, property, or the business's overall balance sheet and offers a pre-agreed limit that does not automatically scale with sales. Invoice finance is often faster to arrange and less reliant on historic profitability, making it a better fit for fast-growing businesses. Revolving credit facilities may suit businesses seeking more predictable, fixed-limit borrowing.

An unsecured business loan provides a fixed lump sum repaid over a set term with regular instalments, regardless of how your sales perform. Invoice finance, by contrast, is a flexible funding line that rises and falls with your invoicing activity — you only draw what you need and repayments align with customer receipts. Unsecured loans typically require strong credit ratings and profitable trading history, whereas invoice finance leans more heavily on debtor quality. For a £600,000 requirement, invoice finance may be easier to secure if your debtor book is robust, while an unsecured loan of that size usually demands an excellent credit profile.

Start by checking whether the lender specialises in your sector and facility size — £600,000 is a mid-range facility and some providers focus on smaller or much larger lines. Review the advance rate carefully; a difference of 5% on a £600,000 ledger can significantly impact cash flow. Assess whether you need invoice discounting with confidentiality or a full factoring service with credit control. Consider notice periods, facility review frequency, and whether there are minimum term commitments or exit fees. Speak to two or three providers and compare their fee structures transparently. A provider that understands your industry and offers responsive account management will add real value beyond the funding itself.