Invoice Finance With Only One Customer - Yes, But Expect Adjusted Terms
Yes, you can get invoice finance with one customer.
Providers apply concentration limits - typically capping 25-40% of a facility against any single debtor. With one customer, your entire book IS that debtor, so expect lower advance rates (60-75% instead of 85-90%) and higher fees. However, if your single customer is a large, creditworthy organisation, specialist providers will work with you. Spot factoring is an alternative that avoids concentration rules entirely.
Invoice finance is possible with only one customer, but concentration limits reduce advance rates to 60-75% and increase costs. The quality of the single customer is critical - government, NHS, and blue-chip debtors get significantly better terms. Spot factoring avoids concentration limits entirely by financing individual invoices. Specialist providers like Bibby and Ultimate Finance handle concentrated debtor books.
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Summary
Concentration risk is a key underwriting factor in invoice finance. Standard concentration limits cap exposure to any single debtor at 25-40% of the facility. With one customer, the provider's entire risk is in one basket. Mitigating factors: strong debtor credit rating, non-recourse (bad debt protection), and government/public sector debtors. Spot factoring is the main alternative - financing invoices individually without whole-ledger concentration rules. Businesses with a single strong debtor (NHS, FTSE 100, government) routinely access invoice finance despite concentration.
This page covers
Whether invoice finance works with a single customer and how concentration limits apply
Not covered here
Freelancer scenarios with 2-3 clients (see /questions/invoice-finance-for-freelancers/), general advance rate information (see /questions/how-much-can-i-borrow-against-invoices/)
Why Concentration Matters to Providers
If you have 20 customers and one goes bust, the provider loses 5% of their exposure. If you have one customer and they go bust, the provider loses everything. That is the concentration risk in plain terms. Providers manage this risk through concentration limits - caps on how much of the facility can be drawn against any single debtor.
With a diverse customer base, these limits are invisible - no single customer exceeds 25-40% of your ledger. With one customer, you immediately breach the limit. The provider does not refuse you outright. Instead, they adjust the terms: lower advance rates, higher service charges, and sometimes additional security requirements.
Your Single Customer's Credit Rating Changes Everything
The identity of your one customer is the most important factor. Consider two scenarios:
Scenario A: Your sole customer is an NHS trust. Government-backed, zero default risk, payment guaranteed by the UK Treasury. A provider will advance 80-90% even with complete concentration because the debtor quality is essentially perfect.
Scenario B: Your sole customer is a small private company with £500,000 turnover, two years of accounts, and average credit. The provider might advance 60-70% with higher fees, and they will credit-insure the exposure or require personal guarantees.
What to Expect - Typical Terms
| Your Debtor Profile | Advance Rate | Service Charge | Likelihood of Approval |
|---|---|---|---|
| NHS / Government | 80-90% | 0.5-1% | Very high |
| FTSE 250 / large corporate | 75-85% | 0.75-1.25% | High |
| Established mid-market company | 65-75% | 1-1.5% | Good |
| Small private company | 60-70% | 1.25-2% | Possible - case by case |
Alternatives to Whole-Ledger Factoring
Spot factoring: Finance individual invoices without a whole-ledger facility. No concentration limits apply because you are funding invoice by invoice. Costs more per transaction (1-5%) but avoids reduced advance rates. Best for occasional funding needs.
Non-recourse factoring: The provider takes on the bad debt risk. If your one customer defaults, the provider absorbs the loss. This actually makes single-customer concentration more acceptable to providers - they have priced and insured the risk. Expect an additional 0.3-0.5% for non-recourse cover.
Credit insurance plus factoring: You take out a separate credit insurance policy on your one customer, then use this to negotiate better factoring terms. The insurance typically costs 0.5-1.5% of insured turnover but can unlock significantly better advance rates because the provider's risk is removed.
Director, Market Invoice
Oliver leads Market Invoice's editorial and comparison research. With a background in UK commercial finance, he oversees provider analysis, rate verification, and industry reporting across all verticals.
Last reviewed: 13 April 2026