Why Do Factoring Companies Worry About Concentration Risk?
If 60%+ of your invoices are to one customer and that customer goes bust, the provider faces a massive loss. Concentration limits (typically 25-40% per customer) spread this risk. Diversifying your customer base gets you better terms.
Why This Matters
Concentration risk is the elephant in the room when applying for invoice finance. If you're a UK SME with 70% of your turnover tied to one major client such as a national supermarket or an NHS trust, factoring providers see a ticking time bomb. When that single customer delays payment, disputes invoices, or worse, enters administration, the provider's entire exposure collapses simultaneously.
This isn't theoretical: when a large customer fails, every supplier relying on it is hit at once. Concentration limits typically cap exposure to any single debtor at 25-40% of your total ledger. For a packaging supplier with £800k turnover, a 30% limit would mean funding only up to £240k of billing to any one customer.
This directly impacts how much working capital you access. The higher your concentration, the lower your advance rate, the higher your fees, or you're declined outright. Spreading your customer base before you approach providers can unlock more funding.
Key Points
- Concentration limits typically restrict 25-40% of your invoice ledger to any single debtor, meaning a business invoicing one customer for 60% of turnover may only access finance against the remaining 40%.
- Providers calculate concentration monthly, so seasonal spikes (e.g. December retail orders) can trigger temporary limit breaches even if annual distribution looks healthy.
- Public sector invoices to NHS trusts or local councils often get higher concentration tolerance because government debtors rarely go bust, unlike private corporates.
- Two-customer concentration is equally scrutinised: if your top two clients represent 75% of sales, providers see correlated risk if both operate in the same struggling sector like UK hospitality.
- Breach consequences vary: some providers reduce your advance rate against the concentrated debtor, others stop funding new invoices to it until the balance falls.
- Start-ups with one pilot customer face chicken-and-egg problems: you can't scale without funding, but can't get funding until you've scaled beyond one customer.
- Demonstrating contracted pipeline with multiple new customers can persuade some providers to accept higher short-term concentration during growth phases.
Illustrative Example
Hypothetical: a Leeds-based IT services company with £600k turnover invoices a single corporate client (a national retailer) for £420k annually, representing 70% concentration. They apply to a mid-market invoice finance provider seeking a £250k facility.
The provider caps its single debtor limit at 35% of turnover, meaning only £210k of the retailer's invoices qualify for funding. With 85% advance rate, the business accesses £178k, not the £250k needed. After winning two new contracts worth £120k each, turnover rises to £840k and concentration drops to 50%. Six months later, the provider increases the facility to £350k and cuts the service charge from 2.8% to 2.2% of invoice value, saving about £5,000 a year on £840k of invoicing.
Common Pitfalls
- Assuming "blue-chip clients are safe" when even a large listed contractor like Carillion went into liquidation in January 2018, leaving suppliers with unpaid invoices.
- Neglecting to mention ongoing tender wins or signed contracts during underwriting, causing providers to assess only historical concentration without seeing diversification trajectory.
- Splitting one customer into multiple legal entities (e.g. invoicing a retailer's stores company and its mobile business separately) without realising providers group all entities under the same ultimate parent company.
- Accepting a facility with 30% concentration limit then landing a major contract that pushes one customer to 55%, triggering funding freezes exactly when you need cash to deliver that contract.
- Forgetting intercompany invoices count toward concentration: if you invoice your own holding company for management fees, that typically cannot be financed and distorts your qualifying ledger.
What to Do Next
- Request your last 12 months sales ledger by customer and calculate what percentage each client represents, flagging any above 25% before approaching providers.
- If concentration is high, document contracted pipeline or active tenders with named prospects to demonstrate diversification plans within 6-12 months.
- Ask shortlisted providers explicitly what their single debtor limit is and whether they offer temporary waivers during growth phases.
- Consider selective invoice finance (discounting specific invoices) rather than whole ledger factoring if one huge customer dominates, allowing you to finance only the diversified portion.
- Review customer contracts for exclusivity clauses or minimum volume commitments that might prevent you from diversifying, addressing these commercially before seeking finance.
Related Questions
Can I get invoice finance with just two customers?
Possible but difficult. Some providers will accept two-customer books if both are creditworthy public sector or large listed customers on multi-year contracts. Expect a lower advance rate and higher fees than a spread ledger would get. Two small private customers are much harder to fund.
Do concentration limits apply to factoring and invoice discounting equally?
Yes, but confidential invoice discounting facilities can have stricter limits because the provider has no direct relationship with your customer to monitor credit risk. Disclosed factoring with credit control may tolerate more concentration, as the provider manages collections and sees early warning signs of debtor distress.
What happens if my main customer goes into administration mid-contract?
Your funding stops immediately for that debtor. The provider typically freezes further advances until you replace the lost revenue. If that customer represented 50% of your ledger, your available facility halves overnight. Bad debt protection (non-recourse factoring) can cover much of the loss, though usually not all of it, and it adds to your fees.
Founder & Managing Director, Muswell Rose, founder and PSC of Best Business Loans Ltd
Adam is the founder and managing director of Muswell Rose and a founder of Best Business Loans Ltd, the company behind Market Invoice. He spent over three years as managing director of Penny, a UK invoice finance business, and his career runs through insurance, mortgages, commercial finance and fintech lending. He writes the Market Invoice library.
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