This guide is maintained as a current resource for September 2026 and covers only the laws of England and Wales. Information is for general guidance, not legal advice. Consult a qualified solicitor for advice specific to your situation.
Understand what a set‑off defence is in contract claims under the law of England and Wales, including legal and equitable set‑off, contractual provisions, how it operates in court and tribunals, practical examples, conditions, limitations and key considerations for parties defending or asserting set‑off in disputes.
When a dispute arises under a contract and one party sues for payment, goods or services, the other party often seeks to defend that claim by asserting a set‑off. A set‑off defence can reduce or extinguish the amount claimed by “netting” it against a sum that the claimant owes the defendant. In legal proceedings, set‑off operates as a shield rather than a weapon: it is used to defend against a claim, not to launch a new separate claim. Understanding how set‑off works in England and Wales is important for businesses, individuals and solicitors involved in contract disputes, commercial litigation, tribunal proceedings and debt claims.
This article explains the legal principles of set‑off, the different types recognised under English law, how a set‑off defence can be raised in practice, and the key considerations when responding to or asserting such a defence.
1. What Is a Set‑Off Defence?
A set‑off defence is a legal mechanism available in civil litigation whereby a defendant in a contract claim asserts that the claimant also owes them money under the same or a related transaction. Instead of paying the full amount claimed, the defendant seeks to offset their own claim against the claimant's claim, thereby reducing or even eliminating the debt in issue. This is a defence to the original claim, and it operates by netting liabilities between the parties. It is distinct from a counterclaim, which is a separate claim for damages or debt and may give rise to a positive entitlement. Set‑off defence only reduces the claimant's claim and cannot generate a positive award in the defendant's favour.
2. Why Set‑Off Matters in Contract Claims
In commercial and consumer contracts, disputes often involve parties that owe each other sums of money. For example:
- A supplier claims payment for goods delivered, but the buyer alleges defective delivery and has incurred costs for remedial work.
- A contractor demands payment under a construction contract, while the client claims damages for delays or non‑performance.
- A lender seeks repayment of a loan, but the borrower asserts losses arising from misrepresentation or breach of other contractual obligations.
In such cases, a set‑off defence allows the defendant to argue that their own claim reduces the amount the claimant can recover. It is a common feature in commercial litigation and is particularly used where claims are closely connected or mutually owed.
3. Types of Set‑Off Recognised Under English Law
Under English law, courts and tribunals recognise different forms of set‑off, each with distinct legal requirements:
A. Legal (Statutory or Independent) Set‑Off
Legal set‑off arises in litigation where both the claimant's and defendant's claims are for liquidated sums - amounts that are certain and readily calculable. This form of set‑off can apply even if the claims are unrelated, provided they are mutual and due at the commencement of proceedings. It is procedural and allows the court to award a net amount after setting the claims off against each other.
B. Equitable (Transactional) Set‑Off
Equitable set‑off applies where two claims arise out of the same transaction or a sufficiently closely related set of circumstances. The defence is available where it would be unjust to enforce the claimant's demand without taking the defendant's claim into account. This form of set‑off can apply to unliquidated sums such as damages. The landmark case Geldof Metaalconstructie NV v Simon Carves Ltd confirmed that equitable set‑off depends on a close connection between the claims and fairness in enforcement.
C. Contractual Set‑Off
Parties can expressly agree in their contract to allow set‑off rights and specify how and when these can be exercised. Contractual set‑off provisions offer greater clarity and certainty, such as setting out mechanisms for netting mutual obligations, deadlines for notices and formulae for calculation. Contracts may also expressly exclude set‑off, in which case a defendant cannot raise it as a defence even if claims are mutual.
4. How a Set‑Off Defence Works in Practice
Raising Set‑Off in Court or Tribunal Proceedings
In civil litigation, a defendant typically includes a set‑off defence in their statement of defence to the claimant's particulars. The defendant must clearly identify the basis of the cross‑claim they seek to set off, including the amount and legal grounding. The set‑off defence cannot exceed the claimant's claim - it cannot result in a positive award in the defendant's favour but serves to reduce or extinguish the claimant's recovery.
In tribunals, such as employment tribunals, the availability of set‑off has been confirmed in case law where reciprocal claims of breach of contract are at issue; tribunals may allow set‑off provided the statutory or contractual requirements for timing and claim type are met.
Distinguishing Set‑Off from Counterclaims
A set‑off defence differs from a counterclaim:
- Set‑off reduces the amount claimed by the other party and remains part of the defensive response.
- Counterclaim is an independent claim for a remedy, such as damages, which may result in a net award if successful.
A defendant may plead both set‑off and counterclaim in appropriate cases.
5. Conditions and Limitations
Set‑off defences are subject to specific conditions:
- Mutuality of claims: Typically both parties must owe each other money or obligations that can be quantified.
- Timing: Legal set‑off requires that sums be due and payable at the time proceedings are commenced; equitable set‑off looks at connection and fairness.
- Contractual exclusions: Parties can agree to limit or exclude set‑off rights in their contract.
Additionally, some contracts - especially in the financial sector, such as standard loan agreements - include anti set‑off clauses that preclude a defendant from relying on even equitable set‑off as a defence to claims for payment. Courts have enforced such clauses where the language is clear.
6. Practical Examples of Set‑Off Defence
Example 1: Supplier and Buyer Dispute
A buyer is sued by a supplier for the balance of an invoice. The buyer, in their defence, asserts that the supplier's delivery was defective and that the buyer has incurred remedial costs. If the defective delivery claim arises from the same contract, the buyer may rely on equitable set‑off to reduce the supplier's claim by the cost of remedial work.
Example 2: Construction Contract
A contractor claims outstanding payment for services. The client asserts that defects led to additional repair costs. Provided the claims are closely connected, the client may raise set‑off to reduce the contractor's recovery, often operating alongside but distinct from abatement.
7. Practical Considerations and Risks
A set‑off defence must be carefully pleaded with clear facts and legal grounding. If incorrectly raised, it can dilute the strength of the defence or lead to procedural challenges. Where contracts contain clauses restricting set‑off, a defendant relying on set‑off may fail and risk an adverse costs order. It is common commercial practice to negotiate express contractual set‑off provisions or no set‑off clauses to avoid uncertainty.
8. Summary
A set‑off defence in a contract claim is a defence mechanism that allows a defendant to reduce or extinguish the claimant's claim by netting it against sums the claimant owes to the defendant. In England and Wales, courts recognise different forms of set‑off, including legal, equitable and contractual set‑off. Set‑off is defensive in nature and distinct from a counterclaim. Its availability and scope depend on the facts, contractual terms and the connection between the claims. Careful drafting of contracts and clear pleadings in litigation are crucial when considering set‑off.
