Defending a breach of contract claim in the UK: your options

You have received a court claim alleging you broke a contract. The other party (the claimant) wants money. You have rights, time limits, and defences available to you. This guide explains what they are, in order.

The short version

You have 14 days to acknowledge the claim (even if you disagree). You then have 28 days to file a written defence. The claimant must prove four things: a contract existed, you breached it, they suffered loss, and the loss flowed from your breach. You may have defences: the contract was never formed, a condition was not met, performance became impossible (frustration), they breached first, time has run out (statute-barred), they did not try to reduce their loss, or you have a counterclaim. File your defence on form N9B. Do not ignore the claim.

At a glance

What the claimant must prove

Before you choose your defence, understand what the claimant needs to show. They must prove four elements, all of them:

1. A contract existed. They must show offer, acceptance, consideration (a swap of value), and both parties intended to be legally bound. An email, letter, handshake, or course of conduct can all form a contract. But if you never agreed to anything, or the terms were only suggested (not accepted), no contract was formed.

2. You breached it. They must point to a specific term of the contract and show you failed to do what it required, or did something it forbade. The term must be clear. Vague promises are harder to enforce.

3. They suffered loss. They must prove actual damage: money out of pocket, lost profit, or costs incurred. Emotional upset or inconvenience alone rarely counts.

4. The loss flowed from your breach. Your breach must have caused the loss. If they would have suffered the same loss anyway (or they failed to prevent it), causation may be broken.

If the claimant cannot prove all four, you have a defence.

Step 1: Acknowledge service (N9) within 14 days

When you receive the claim, do not panic or ignore it. You must act within 14 days.

Your options:

• Acknowledge service (N9). Tick "I intend to defend all of the claim" or "I intend to defend part of the claim" and file it with the court and send a copy to the claimant. This buys you time to prepare your full defence. It does NOT admit liability.
• File a defence straight away (N9B). If you are ready, you can skip acknowledgement and go directly to your written defence within 28 days.
• Apply to strike out the claim (N1). If you believe the claim is legally defective (for example, it discloses no arguable cause of action), you can ask the court to dismiss it at an early hearing. This is rare and technical.

Most defendants acknowledge service. It gives you breathing room.

Do not do nothing. If you fail to respond within 14 days, the claimant can ask for judgment in default (a court order against you without hearing your side). You can apply to set a default judgment aside, but it is harder and more expensive.

Defence: No contract formed

A contract requires four elements. If any is missing, no contract exists, and the claimant cannot win.

Offer and acceptance. Was there a clear offer, and did you clearly accept it? An invitation to negotiate is not an offer. A price list or brochure is usually an invitation to treat (an invitation for you to make an offer). You make the offer when you place an order; the seller accepts (or rejects) it. If you were haggling over terms and never agreed on a final set, no contract formed.

Consideration. Did both sides exchange something of value? In a simple sale, you pay money and the seller hands over goods or services. If one side promised something for nothing, consideration is missing. A promise to make a gift is not a contract.

Intention to be legally bound. Did both parties intend the agreement to have legal force? Social or domestic agreements (a dinner invitation, a promise to help a friend) are not contracts because neither party intends court enforcement. Most business dealings carry the presumption of legal intent, so you would need strong evidence (for example, "this is not legally binding" written down) to argue otherwise.

Certainty of terms. Were the essential terms agreed? Price, quantity, and scope of work must be clear enough for a court to enforce. If you said "we will discuss price later," no contract may have formed if you never settled on a price.

Example: You received an email saying "interested in your services, let me know your best price." You replied with a price quote. They did not accept it in writing or verbally. You never heard from them again, then received a claim. You can argue no contract was formed because there was no clear acceptance of your terms.

Defence: Conditions precedent not met

Some contracts specify that one party's obligation does not arise until a condition is satisfied. If the condition is not met, performance is not due.

What is a condition precedent? A condition precedent is an event that must happen before a party's duty to perform arises. Examples:

• "The contract is conditional on satisfactory inspection of the goods."
• "Payment is due only after we receive written approval from the planning authority."
• "We will supply goods conditional on credit check approval."

If the condition is not satisfied, the party relying on it is not in breach by failing to perform.

How to use this defence: Check the contract for any "provided that," "subject to," "conditional upon," or "if" language. Look at schedules and special conditions. If one is relevant and was not met, you have a defence. You may be obliged to work towards satisfying the condition (good faith obligation), but you are not automatically in breach if it fails to materialise.

Example: A contract states "Supply is conditional on customer obtaining financing approval within 30 days." The customer did not pursue financing and missed the deadline. The supplier has no obligation to supply, and the customer has no claim for breach.

Defence: Frustration

Frustration is a rare but powerful defence. It applies when performance of the contract becomes impossible or radically different after the contract was formed, through no fault of yours, and neither party foresaw the change.

The test (from Law Reform (Frustrated Contracts) Act 1943):

1. An event occurs after the contract is formed.
2. The event makes performance of the contract impossible, or so radically different that it would be unfair to hold you to the original terms.
3. Neither party caused the event.
4. Neither party assumed the risk of the event in the contract.

Common examples:

• A fire destroys the only warehouse where goods were to be stored.
• A supplier's factory is destroyed by flood; they cannot supply goods under an existing contract.
• A key supplier goes insolvent, and alternative suppliers are unavailable at any price.
• War or government action (lockdown, embargo) makes the contract impossible to perform.

What frustration is NOT:

• Harder, more expensive, or inconvenient to perform. If supply chain costs rise sharply, that is not frustration; you still owe the goods.
• A change in market conditions. If the market price falls, the seller is not frustrated.
• Your own failure to arrange a key resource.

How to use this defence: Identify the event that occurred. Show it was unforeseeable and not your fault. Show that it made performance impossible or radically different. Argue the risk was not expressly allocated to you in the contract. Courts are strict; frustration is a high bar. If the contract includes a "force majeure" clause, check it; it may list specific events (pandemics, war, strikes). If the event is listed, use the clause; if it is not, frustration may fail.

Example: You contracted to hire out a wedding venue on 1 June 2024. On 15 May, a fire destroys the building. You cannot perform. This is frustration. You are not in breach, and the customer has no claim for damages.

Defence: Claimant's repudiatory breach first

If the claimant broke a fundamental term of the contract before you did, you may have been entitled to end the contract and stop performing. If you did so, you are not in breach of the claimant's later claims against you.

What is repudiatory breach? A repudiatory breach is a breach of a fundamental term (called a "condition" in law) that goes to the heart of the contract. It entitles the innocent party to reject performance and end the contract, rather than just claim damages.

Examples of fundamental terms:

• In a sale, delivery on the agreed date, or delivery of goods that match the description.
• In an employment contract, payment of wages, or a safe workplace.
• In a service contract, that the service provider has the promised qualifications.

How to use this defence: Show that the claimant broke a fundamental term first. Explain that you were entitled to treat the contract as ended. Show that you did end it (by notice or conduct) or that your failure to perform was a result of the claimant's prior breach. If the claimant's breach was minor (a delay of one day in a contract allowing time for performance), a court may not classify it as repudiatory, and this defence may fail.

Example: A supplier agreed to deliver goods by 1 April. Delivery is essential to the contract (the date is a "condition"). The supplier did not deliver until 15 April, and by then the goods were useless to you. You refused to accept them or pay. The supplier claims breach of contract. You can argue the supplier repudiated the contract by missing the delivery date, you were entitled to reject performance, and you owe nothing.

Defence: Exclusion or limitation clause

The contract may include a clause that excludes your liability altogether or limits it to a certain amount. This can be a powerful defence.

Important limits on exclusion clauses:

Under the Unfair Contract Terms Act 1977 (UCTA), exclusion clauses are void if they are unfair. Courts ask:

• Was the clause brought to your attention before you agreed? If it was hidden in small print or came after you agreed, it may not be binding.
• Is it reasonable? Courts assess whether a reasonable person would have agreed to it, taking into account the bargaining strength of both parties, whether you could have negotiated a different term, and industry custom.

Under the Consumer Rights Act 2015 (CRA), if you are a consumer (acting outside business) and the other party is a business, unfair terms in a contract are not binding on you. Unfairness is judged against a requirement of good faith and reasonable expectations. For example, a clause that allows the business to change the price or cancel at will may be unfair.

Business-to-business contracts: If both parties are businesses, you have fewer protections. Courts are slower to strike down exclusion clauses. However, if the clause was not clear, or if the other side misrepresented its effect, it may still fail.

How to use this defence: Find the exclusion or limitation clause in the contract. Check that it clearly covers the breach the claimant is alleging. If it does, argue it is fair, clearly worded, and was part of the agreement. If the claimant is a business, you are likely on strong ground. If they are a consumer (a person acting outside a business), check the fairness test.

Example: A software licence states "We exclude liability for loss of data or loss of profit. Our total liability is limited to the amount paid for the licence." The customer claims they lost profit because the software crashed. You can rely on the exclusion clause and are not liable for lost profit.

Defence: Statute-barred

The Limitation Act 1980 sets a deadline for bringing contract claims. If the claim is too old, it is "statute-barred" and the claimant has lost the right to sue.

Time limits:

• Simple contracts (oral, letter, email, handshake). Claim must be brought within 6 years of the breach. (Limitation Act 1980, s 5.)
• Contracts under seal (rare, on a formal deed). Claim must be brought within 12 years of the breach.
• Judgment debts. Claim must be brought within 6 years of the judgment date.
• Latent damage (hidden defect). In some cases, the clock does not start until the claimant discovers (or should have discovered) the breach. Courts balance fairness.

How the clock starts: The clock starts on the date of the breach (not the date you first heard of it). If the claimant discovers the breach years later, it is too late.

How to use this defence: Establish the date the breach occurred. Check the date the claim was filed (it appears on the court documents). If more than 6 years have passed, raise statute of limitations. File evidence of the breach date (a contract, an email, a letter, a dated invoice). The claimant may argue the breach was recent or that the clock was paused, but the burden is heavy.

Example: You and a customer signed a contract in January 2019. In March 2019, you allegedly breached it. The customer did not sue until April 2026, nearly seven years later. The claim is statute-barred. You can ask the court to dismiss it.

Defence: Claimant failed to mitigate loss

If the claimant suffered loss from your breach, the law expects them to take reasonable steps to reduce (mitigate) that loss. If they did not, they cannot recover the loss they could have avoided.

What is mitigation? Mitigation is the duty to take reasonable steps in response to a breach to minimise harm. Examples:

• If a supplier cancels your order, you should shop around for an alternative supplier. If a cheaper alternative is available, you cannot claim the full difference in price.
• If a contractor abandons a job, you should hire another contractor. You cannot claim the full cost if you could have hired someone cheaper.
• If goods are damaged in transit, you should file an insurance claim. You cannot recover if insurance would have covered the loss.

What is NOT required: Mitigation does not require you to go to extraordinary lengths, spend large sums, or take on a huge risk. It requires only reasonable steps that a prudent business would take.

How to use this defence: Show that the claimant could have taken a reasonable step to reduce the loss. Gather evidence: quotes from alternative suppliers, evidence of insurance available, etc. Argue that the claimant's own failure to act worsens the damage. Courts are sympathetic to this defence when the evidence is clear.

Example: A caterer cancels your wedding one week before the date, breaching the contract. Instead of hunting for an alternative caterer or cancelling the wedding, you go ahead and hire the first expensive caterer you find, at double the original price. The caterer claims the full difference. You argue the customer failed to mitigate by not seeking cheaper alternatives. Damages may be reduced.

Defence: Set-off and counterclaim

If the claimant owes you money (whether under the same contract or a different one), you can set-off that amount against what they claim you owe them. If you have a claim of your own against the claimant, you can counterclaim.

Set-off: If the claimant says you owe them GBP 10,000 and you say they owe you GBP 3,000 under the same contract, the net claim is GBP 7,000. You can use set-off in your defence.

Counterclaim: If you have a separate claim against the claimant (for example, they breached a different contract with you, or they owe you money for work you did), you can file a counterclaim. The court will hear both claims together.

How to use this defence: In your defence, state the amount you are owed and explain why. Attach invoices, emails, or other evidence. If you are setting off against the claim, state it clearly: "We admit owing GBP 10,000, but the claimant owes us GBP 3,000; the net claim is GBP 7,000, and we set-off the GBP 3,000 debt in defence." If you are countering with a separate claim, file a counterclaim on form N1C and explain the claim in detail.

Example: A client owes you GBP 8,000 for freelance services and sues you for GBP 5,000, claiming breach of a separate contract. You can counterclaim for GBP 8,000 and use set-off; the net claim is that the client owes you GBP 3,000.

Step 2: File defence (N9B) within 28 days

Once you have gathered evidence and identified your defence, file a written defence on form N9B within 28 days of receiving the claim (or 28 days after acknowledging service, whichever is later).

What to include in your defence:

1. Heading: Case name, claim number, court.
2. Statement of truth: "I believe the facts in this defence are true."
3. Each defence, numbered: For each defence you are raising, explain it clearly. Refer to the contract if applicable. Cite the law if relevant (for example, "Limitation Act 1980, s 5" or "Law Reform (Frustrated Contracts) Act 1943"). Provide facts supporting each defence.
4. Evidence: Attach as exhibits: the contract, emails, invoices, photographs, expert reports, anything relevant.
5. Signature and date: Sign it yourself or have your solicitor sign.

Length and clarity: Be clear and concise. Avoid jargon unless necessary. A court will read your defence expecting plain English. If you have multiple defences, separate them so the judge can follow. Avoid repetition.

File and serve: Submit the defence to the court (by post, email, or online portal) and serve a copy on the claimant or their solicitor on the same day. Keep proof of service (a letter showing you sent it).

No reply needed from you: Once you file your defence, the claimant has options: they can file a reply, ask for more information, or move toward a hearing. You do not file a further response unless the court orders you to.

Step 3: Mediation, allocation, hearing

After both sides have filed their case statements (claim, defence, reply), the court will usually stay the case and suggest mediation. Mediation is an informal attempt to settle with the help of a neutral third party. It is often successful and cheaper than a full hearing.

If mediation fails or you decline it:

1. Allocation hearing: A judge will read the statements and decide which track the case goes to: small claims (claims under GBP 10,000), fast track (GBP 10,000 to GBP 25,000), or multi-track (over GBP 25,000). Each has different rules and timelines.
2. Directions: The judge will order what evidence each side must exchange, what witnesses will testify, and when the full hearing will take place.
3. Trial or summary judgment: If either side applies, the judge may decide the case on paper without a hearing if the law is clear and no fact is disputed. If a hearing is needed, both sides present evidence and arguments. The judge decides who wins and awards damages.

Your role: Attend the allocation hearing if ordered. Prepare witnesses. Gather evidence. Cooperate with disclosure (exchanging documents). Respond to any orders the court makes. If you believe the claimant's claim has no merit, ask your solicitor about applying for summary judgment early.

Day to day: timeline

The timeline varies. Cases settle at any point. Do not assume a trial will happen; many do not.

Common misconceptions

"I can ignore the claim if I disagree with it." No. Ignoring a claim results in judgment in default (an automatic loss). You must respond within 14 days.

"If I acknowledge service, I admit liability." No. Acknowledgement just tells the court you received the claim and will defend it. It does not admit anything.

"I can change my defence story later." Not easily. Once you file a defence, changing it requires the court's permission. File your best defence from the start.

"The claimant has to prove I owe them money." Yes. The claimant bears the burden of proof. You just have to raise a reasonable doubt about one of the four elements (contract, breach, loss, causation). But if you file a counterclaim, you must prove it.

"I should argue every possible defence." No. Pick the strongest defences and focus on them. Too many weak arguments dilute your case and make you look unprepared.

"I need a solicitor to defend a claim." Not always, but it helps. In the small claims track, many people defend themselves. In higher-value claims, a solicitor is wise. Either way, understand your options yourself first.

"If I lose, I appeal and get another try." Appeals are difficult and expensive. You can appeal only on a point of law, not just because you disagree with the judge's decision. Plan to win at first instance, not in the appeal court.

Related concepts

• What is a contract?
• Contract terms: conditions, warranties, representations
• Breach of contract: what counts
• Damages and how courts calculate them
• Alternative dispute resolution: mediation and arbitration
• Contract disputes in small claims
• Writing a letter before action
• Consumer rights if you are sued for a breach
• Employment contract disputes
• Commercial contracts and force majeure clauses

Sources

• UK Government. Respond to a court claim: https://www.gov.uk/respond-county-court-claim
• Legislation.gov.uk. Limitation Act 1980: https://www.legislation.gov.uk/ukpga/1980/58
• Legislation.gov.uk. Law Reform (Frustrated Contracts) Act 1943: https://www.legislation.gov.uk/ukpga/1943/40
• Citizens Advice. Small claims: https://www.citizensadvice.org.uk
• Legislation.gov.uk. Unfair Contract Terms Act 1977: https://www.legislation.gov.uk/ukpga/1977/50
• Legislation.gov.uk. Consumer Rights Act 2015: https://www.legislation.gov.uk/ukpga/2015/15

Disclaimer

This page provides general information about UK contract law and defending breach of contract claims. It is not legal advice. Your situation may have unique facts that change the legal analysis. Before filing a defence or making court decisions, consult a solicitor or barrister, especially if the claim is over GBP 10,000 or involves complex facts. CaseCalm and Peter Kolomiets assume no liability for decisions made based on this page alone.

Written by Peter Kolomiets, founder of CaseCalm. UK legal content reviewed and verified on 2026-05-28.