Unjust Enrichment: What UK Businesses Need To Know To Avoid Paying Twice

It’s every business owner’s nightmare: you pay an invoice or settle an account, only to find out a few weeks down the track you’re being asked to pay again - maybe to a supplier’s administrator, or due to a contract dispute. At first, it might seem like an honest mistake or just an annoying glitch. But sometimes, you really can be left facing demands to pay twice, simply because of how money has transferred, business contracts have ended, or a deal has gone wrong.

If this happens, you might hear a legal phrase come up: unjust enrichment. But what actually is unjust enrichment? And how do you ensure you’re legally protected and not left footing the bill twice - or worse, losing money with no real way to recover it?

If you’re running a small business or startup in the UK, understanding unjust enrichment is crucial. It can arise in everything from supplier relationships and customer refunds, to internal disputes or even insolvency. In this article, we’ll break down (in plain English) what unjust enrichment means, how you might encounter it, and the practical legal steps you can take to avoid getting caught out.

Let’s dive into what you need to know so your business stays protected.

What Is Unjust Enrichment?

Unjust enrichment is one of those legal terms that can sound complicated, but the basic idea is pretty straightforward. In UK law, unjust enrichment refers to the situation where one party gets a benefit or money (enrichment) at another’s expense, in circumstances where it would be unfair (unjust) for them to keep it.

This kind of claim is sometimes called a “quasi-contract” - meaning the law acts as if there is a contract between you and the other party, to prevent someone being unfairly better off. The courts use unjust enrichment to provide a remedy when:

• There’s been no formal agreement between the parties, or
• A legal contract didn’t quite cover the situation, or
• People were paid twice, by accident, for the same goods or services

A classic example: You pay a supplier in good faith, but they go bust before delivering. Their liquidator asks you to pay again to get your goods. Should you have to pay twice? Unjust enrichment law might step in to make things fair.

How Can Unjust Enrichment Affect UK Businesses?

Unjust enrichment doesn’t just crop up in academic law cases. It’s surprisingly common in day-to-day business, especially where payments, refunds, or unexpected events (like insolvency or terminated contracts) are involved.

Real-World Business Scenarios

• Double Payments: You accidentally pay an invoice twice, or pay both a supplier and then their administrator when they go insolvent.
• Failed Deliveries: You pay upfront for stock, but the supplier goes under before delivering. You’re asked to pay the administrator to get your goods released.
• Service Cancellations: You pay for a service in advance, but the provider cancels or can’t deliver. They refuse to refund you, but keep your payment.
• Contract Disputes: A project is cancelled. You’ve already paid, but the other party claims they did part of the work and refuses a refund. Who gets to keep the money?

In all these examples, one business is left out of pocket, and someone else has gained an unjust benefit. That’s when unjust enrichment law can become very relevant.

What Are The Legal Ingredients Of Unjust Enrichment?

If you do need to make (or defend against) a legal claim for unjust enrichment, the courts usually look at four main ingredients:

1. Enrichment: Has one party received a tangible benefit, usually money, goods, or services?
2. At Another’s Expense: Was this benefit gained at the cost or loss of the other party?
3. Unjust: Are the circumstances such that it would be unfair for them to keep the benefit (for example, because of a mistake, failure to deliver, or broken agreement)?
4. No Legal Justification: Is there no valid legal basis for them to keep what they’ve received? (E.g., no binding contract entitles them to it.)

If all four are met, the court may order restitution - essentially, that the unjustly enriched party must pay the money back, refund the goods, or make good the unfair gain.

But, getting to this point can be complex, costly and time-consuming - so it’s much better to avoid unjust enrichment situations in the first place!

What Are Common Triggers For Unjust Enrichment Claims?

For most small businesses, unjust enrichment is most likely to arise in practical scenarios such as:

• Insolvency and Administration: Paying for goods/services before a supplier goes bust, then being asked to pay again to get your product. Or, your own business receives payment, then goes into liquidation before fulfilling services.
• Mistaken Payments: Paying an invoice twice, sending money to the wrong bank account, or paying a supplier instead of their nominated agent/administrator.
• Contract Endings: Prepayments for work or goods that are not delivered because of cancellation or a dispute over whether services were performed.

How Does UK Law Deal With Unjust Enrichment?

Unjust enrichment is a principle of English common law. It applies in England and Wales whether you’re a sole trader, partnership, or limited company. There may not be a specific “Unjust Enrichment Act”, but courts will look at key case law and equitable principles if a dispute reaches them.

More practically, several related UK laws help prevent or resolve unjust enrichment scenarios. These include:

• The Insolvency Act 1986: Sets out rules for what happens during company insolvency, including how assets and contracts are handled.
• Consumer Rights Act 2015: Covers refunds for undelivered or faulty goods to consumers - but can also offer helpful precedents for business-to-business disputes.
• The Law of Restitution: General legal principles that allow a court to order one party to repay another if they have been unjustly enriched.

For most business owners, the key is to understand how to manage contracts, payments, and refunds to avoid getting into situations where unjust enrichment could be alleged.

How Can I Avoid Unjust Enrichment Issues In My Business?

With careful planning and the right legal protections, your business can dramatically reduce the risk of unjust enrichment cropping up. Here are some crucial steps.

1. Always Use Clear, Written Contracts

Having a robust written contract in place for every business deal makes it much less likely you’ll face uncertainty about payments, refunds, or what happens if things go wrong. Your contracts should clearly state:

• Who is to be paid, and when
• What happens if payment is delayed or not made
• The consequences if either party can’t deliver (e.g. due to insolvency or force majeure)
• The process for refunds or returns if services/goods can’t be provided

If your current template isn’t clear on these points, consider working with a contract law expert to update your contracts and minimise risk.

2. Double-Check Payment Details Before Sending Money

It’s surprisingly common for businesses to pay the wrong party or make duplicate payments. Make sure your accounting processes include:

• Verifying bank account details for new suppliers
• Checking for duplicate invoice numbers before processing payment
• Requiring written confirmation for changes to payment instructions, especially if a supplier is in administration

A single moment of carelessness can be all it takes for unjust enrichment risks to arise. So it’s worth building these checks into your routine.

3. Keep Good Records And Proof Of Payment

Documentation is your best friend if a payment dispute arises. Always keep:

• Copies of all invoices, receipts and remittance advice
• Bank statements showing proof of payment
• Email trails or signed contracts documenting agreed terms

If you’re asked to pay again, being able to prove you’ve already paid is essential. This also supports your position in any legal dispute or potential court claim.

4. Understand Administration & Insolvency Risks

In the unfortunate event that a supplier (or even your own business) faces insolvency, the rules can be complicated. Payment and supply contracts may be overridden by the administrator’s right to realise company assets. To protect your business:

• Check if your contracts include reservation of title clauses (allowing you to recover goods if not paid for)
• Be cautious when asked by an administrator to pay again for goods or services you’ve already paid for
• Seek legal advice immediately if threatened with loss of goods or duplicate payment

5. Set Out Your Refunds And Cancellations Policy

Whether you’re selling to consumers or other businesses, having a clear refunds and exchanges policy in place is invaluable. This can help resolve disputes before they become legal claims, and supports you in defending against unjust enrichment claims where a customer is not entitled to a refund under your terms.

What If My Business Is Facing An Unjust Enrichment Claim?

If you receive a demand from a customer, supplier, or administrator claiming unjust enrichment, don’t panic - but do act quickly.

• Gather all records of the transaction, including contracts, invoices, and correspondence
• Check whether your contract covers the dispute (sometimes the terms will override a claim for unjust enrichment)
• Seek advice from a business law expert - these cases are often very fact-specific and legal support can help avoid costly mistakes

If you’ve been paid too much in error, or received goods/services unfairly, it’s usually best to be proactive and resolve things quickly rather than risk a court claim.

What Legal Documents Reduce My Risk Of Unjust Enrichment Problems?

The right paperwork is your main protection. The most important legal documents to shield your business include:

• Supply Agreements and Service Contracts: Spell out payment, delivery, and remedy procedures if things go wrong. See our guide to essential business contracts.
• Terms and Conditions: Make clear your refund, returns, and dispute process in writing for customers and suppliers.
• Invoice Procedures: Set written processes for who is paid, how, and checks against duplication.

Avoid using cheap templates or drafting these yourself - proper, tailored documents are worth the investment to keep you protected from day one.

Key Takeaways

• Unjust enrichment arises when someone keeps a payment, benefit or asset at your expense, without valid justification - and it can cost your business dearly if not handled correctly.
• It often crops up in double payments, insolvency, failed deliveries, and mistaken payments - situations many UK businesses encounter at some point.
• Setting up robust contracts, clear payment/refund policies, and careful record-keeping all help to minimise your risk.
• Take care when suppliers (or your own business) enter insolvency and never pay again without legal advice.
• If a dispute or claim arises, gather all your documentation and seek advice immediately - don’t go it alone.
• Having professionally drafted legal documents, including contracts and service agreements, is the best way to protect your business from unjust enrichment claims and payment disputes.

If you’d like help reviewing your contracts, drafting robust terms, or resolving an unjust enrichment issue, reach out to Sprintlaw UK for a free, no-obligations chat at team@sprintlaw.co.uk or call 08081347754. We’re here to help your business stay protected, every step of the way.