What Is an Assignment of Debt?
An assignment of debt is the legal transfer of the right to collect an invoice from you to the finance provider. In factoring, it is a full legal assignment, the provider becomes the legal creditor. In discounting, it is usually an equitable assignment that only crystallises into legal assignment if something goes wrong.
Why This Matters
When you use invoice finance, you're not just borrowing money, you're transferring legal rights to your unpaid invoices. An assignment of debt is the legal mechanism that gives the finance provider a claim on those debts. In factoring, the provider takes full legal ownership of the invoice and manages collection directly from your customer.
In invoice discounting, you retain control of collection, but the provider holds an equitable interest that converts to full legal assignment if you default or can't collect. This distinction affects customer relationships, notification requirements, and your obligations under insolvency law.
Understanding assignment is essential because once assigned, those debts no longer fully belong to you, they secure the provider's advance. For UK SMEs, this means you can't double-finance the same invoice, you must account for all collections properly, and if your business enters administration, the provider has prior claim to those assigned debts.
The assignment sits at the heart of the invoice finance contract and determines who legally owns the right to be paid by your customer.
Key Points
- Legal assignment transfers full legal title to the debt. The finance provider becomes the legal creditor, your customer legally owes them, not you. Used in factoring and disclosed facilities.
- Equitable assignment gives the provider beneficial interest but leaves legal title with you. Common in confidential invoice discounting. Only converts to legal assignment on default or insolvency.
- Notification of assignment is legally required for a full legal assignment to be enforceable against the debtor under s.136 Law of Property Act 1925. Without written notice to the customer, the assignment remains equitable only.
- Once assigned, you cannot assign the same debt elsewhere. Attempting to do so constitutes fraud. Most facilities require exclusive assignment of your entire sales ledger.
- On insolvency, assigned debts belong to the finance provider, not the liquidator or administrator. They sit outside your asset pool available to ordinary creditors.
- You remain liable for invalid debts. If a customer disputes an invoice, refuses payment, or claims set-off rights, you must refund the advance to the provider.
- Assignment survives termination of the facility. Debts raised while the facility was active remain assigned until collected, even after you stop using the service.
Real-World Example
A Birmingham engineering firm uses invoice discounting from Close Brothers. They raise a £45,000 invoice to a Midlands manufacturer on 30-day terms and receive an 85% advance (£38,250). The assignment is equitable and confidential, the customer is never notified and pays the engineering firm directly.
The firm collects £45,000 from the customer 28 days later, but instead of remitting it to Close Brothers, the director uses it to pay urgent suppliers. Close Brothers discovers the breach, immediately crystallises the equitable assignment into legal assignment, notifies the customer directly, and pursues collection. The firm owes Close Brothers the £45,000 plus fees and is in material breach of contract.
Common Pitfalls
- Assuming you can switch providers freely. Existing assignments tie up your ledger until those debts are collected, often preventing you from moving to a competitor for 60-90 days.
- Failing to declare all collections. If you receive customer payments into your own account (common in discounting), you're legally obliged to remit them immediately. Using assigned funds for other purposes is breach of trust.
- Overlooking customer set-off rights. If your customer has a valid counterclaim (faulty goods, late delivery), they can offset it against the assigned debt, leaving you liable to refund the finance provider.
- Not checking assignment clauses in your customer contracts. Some large corporate clients prohibit invoice assignment without consent, making the debt unfinanceable.
- Believing confidential facilities are completely invisible. While customers aren't notified routinely, assignment details appear in your facility agreement and can surface during due diligence or audits.
What to Do Next
- Review the assignment clause in any invoice finance proposal. Check whether it's legal or equitable, what triggers conversion, and whether it covers your whole ledger or selected invoices only.
- Confirm your customer contracts don't contain anti-assignment clauses. If they do, negotiate waivers before signing a finance facility, especially with public sector or large corporate clients.
- Establish clear internal processes for handling customer payments if using discounting. Ensure all collections are identified, recorded, and remitted to the provider within contractual timescales (usually 24-48 hours).
- Seek legal advice before signing if you have existing security in place. Assignment may conflict with existing charges or debentures held by your bank or other lenders.
Related Questions
Can I use invoice finance if my customer contracts prohibit assignment?
No, not without customer consent. Many public sector bodies and large corporates include anti-assignment clauses in their terms. You'll need written waivers before a finance provider will advance against those debts. Some providers, particularly those working with NHS or government contractors, have standard waiver processes in place.
What happens to assigned debts if my business goes into administration?
Assigned debts belong to the finance provider, not the insolvency practitioner. They're collected by the provider and don't form part of the insolvent estate available to ordinary creditors. However, you remain liable for any shortfall if debts prove uncollectable or are disputed by customers.
Does assignment affect my customer relationships in invoice discounting?
Not usually, because assignment remains confidential and equitable. Customers pay you normally and aren't notified. However, if you default or enter insolvency, the provider crystallises the assignment and contacts customers directly, which can damage relationships. Maintaining compliance is essential to keep the facility confidential.
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.
Last reviewed: 13 May 2026