A contract is a legally binding exchange of promises, and the general rule of Australian contract law is that you cannot walk away from it just because it no longer suits you. Do so without a legal basis and the other side can claim damages for the benefit they lost, and your attempted exit can itself be treated as a repudiation of the contract.
That rule, however, is only half the picture. The law recognises a set of routes out of a contract, and which route applies usually decides whether your exit is clean or expensive. A contract can end because the parties have performed their obligations, because a breach gives the innocent party a right to terminate, because one party repudiates the contract, because an unforeseen event makes performance impossible, because the contract was never valid in the first place, or because both parties agree to end it. Statute adds further routes, including consumer guarantees and cooling-off rights.
This article walks through each route, what must be true before you can rely on it, and where the risk of getting it wrong is concentrated.
Who holds the levers
In most cases only two parties are involved: you and the other side. One wants out; the other wants the deal performed, or compensation for losing it. The law does not take sides. It asks whether a recognised ground for ending the contract exists, and where the parties disagree, a court or tribunal decides. In some areas, the Australian Consumer Law (ACL), which sits in Schedule 2 of the Competition and Consumer Act 2010 (Cth), gives termination rights that do not depend on what the contract says.
The tension between the parties is straightforward. The party wanting out wants certainty and the lowest possible cost of exiting. The party wanting performance wants the benefit of the bargain, or damages that stand in for it. Because the party who terminates without a valid ground can end up paying damages to the party it tried to leave, the mechanics matter more than the strength of your feelings about the deal.
When performance runs its course
The simplest route is the one most people forget: a contract ends when every party has done everything the contract required. Discharge by performance needs no notice, no document and no agreement. When you have supplied what you promised and the customer has paid what they promised, the contract is finished, subject only to obligations that survive it, such as warranties or confidentiality clauses.
When the other party breaches
The mistake businesses most often make is assuming any breach lets them out. It does not. A breach usually gives the innocent party a right to damages, but unless the contract says otherwise, it does not automatically end the contract, and it does not always give a right to terminate.
- Condition: a term that goes to the root of the contract, sometimes called an essential term. Any breach of a condition gives the innocent party the right to terminate.
- Intermediate term: a term that is neither a condition nor a warranty. A breach of an intermediate term gives a right to terminate only if the breach is serious enough.
- Warranty: a minor term. A breach of a warranty gives a right to damages only, not termination.
The High Court set out the governing approach in Koompahtoo Local Aboriginal Land Council v Sanpine Pty Ltd [2007] HCA 61. A breach justifies termination where the term breached is a condition, or where the breach of an intermediate term is sufficiently serious that it deprives the innocent party of substantially the whole of the benefit the contract was intended to give them.
That is why well-drafted contracts say which terms are essential and list the events that allow termination. A customer who is late paying a single invoice may be in breach, but whether you can terminate the whole supply agreement depends on whether the payment term is essential, whether the contract gives you that right, and how serious the failure is.
Making the election
When a right to terminate arises, the innocent party faces an election: terminate the contract, or affirm it and keep it going. The choice is binding. If you keep accepting performance after you know about the breach, or delay too long before acting, you can be taken to have affirmed the contract and lost the right to terminate for that breach. You can still claim damages, but the contract stays on foot.
Notice to remedy
At common law there is no general requirement to give the breaching party a chance to fix the breach before you terminate for breach of an essential term. In practice, contracts usually change this by including a notice-to-remedy clause: written notice, a cure period, and termination only if the breach is not fixed. If the contract has such a clause, you must follow it to the letter. Terminating without the required notice is a wrongful termination, which puts you in breach.
When the other party repudiates
Repudiation is a different ground, closely related to serious breach. A party repudiates a contract when their words or conduct show that they are unwilling, or unable, to perform their substantial obligations under it. The High Court described it in Koompahtoo as evincing an inability or unwillingness to render substantial performance.
Repudiation commonly appears before performance is due. A supplier who emails to say they will not deliver at the agreed price has repudiated the contract even though delivery day has not arrived. This is anticipatory repudiation. The innocent party can accept the repudiation, terminate, and look elsewhere for supply while claiming damages for the extra cost. But repudiation does not end the contract by itself. If you do not accept it and instead keep insisting on performance, the contract remains binding on both sides.
When performance becomes impossible
Frustration ends a contract when a supervening event, for which neither party is responsible, makes performance impossible or radically different from what the parties contemplated. The leading Australian discussion of the doctrine is Codelfa Construction Pty Ltd v State Rail Authority of NSW [1982] HCA 24. Classic examples are the destruction of the subject matter, a change in the law that makes performance illegal, and delay so long that the contract's purpose is destroyed.
When frustration occurs, the contract ends automatically. Neither party is in breach, and neither owes damages for non-performance. Three limits matter:
- Self-induced frustration: you cannot rely on an event you caused or contributed to.
- Allocated risk: if the contract deals with the event, for example through a force majeure clause, frustration is usually excluded and the contract continues.
- Mere hardship: an event that makes performance more expensive or less profitable is not frustration. Australian courts have been slow to find frustration where an event merely makes performance harder, which is why many COVID-era disputes over rent and supply did not end in frustration findings.
A frustrated contract also raises the question of money already paid. The rules on recovering payments under a frustrated contract differ between states and territories, so this is a point for advice rather than a general rule.
When the contract was never valid
Some contracts never bind the parties at all, or bind them only until they are set aside. The distinction matters.
A void contract is treated as never having existed. It cannot be enforced by either party. A contract can be void because its purpose is illegal, because there is no consideration supporting the promises, because a party lacked the legal capacity to enter into it, or because both parties were fundamentally mistaken about what they were agreeing to.
A voidable contract is valid until the party with the right to avoid it acts. That right arises where the contract was entered into because of a misrepresentation, duress, or undue influence. Undue influence is where one party is in a position of influence over the other and the transaction is not the free exercise of the weaker party's will. The High Court recognised in Johnson v Buttress (1936) 56 CLR 113 that in certain relationships, such as between a guardian and a dependent, a presumption of undue influence arises. A contract set aside for these reasons is unwound, with each party restored to their pre-contract position as far as possible.
There is also a statutory version of invalidity. Under s 23 of the ACL, an unfair term in a consumer contract or a small business standard form contract is void. The rest of the contract continues if it can operate without the unfair term, so this route usually removes a clause rather than ending the whole contract.
When both parties agree
The parties are free to end a contract by mutual agreement. This is best done in writing, and it should record that the parties release each other from their remaining obligations. Where a new contract replaces the old one, the change can be a variation or a novation. If a party is replaced, all three parties must consent to the new arrangement.
A contract can also come to an end by abandonment. If both parties act as though the contract is over, for example by not performing and not insisting on performance for a long period, the contract can be treated as discharged. Relying on abandonment is riskier than documenting the end, because intention is inferred from conduct.
The statutory routes
For businesses buying goods and services, the consumer guarantees in the ACL operate like a built-in set of termination rights. If a supplier fails to comply with a guarantee, s 259 of the ACL (for goods) and s 267 (for services) set out the steps.
If the failure can be remedied and is not a major failure, the first step is to require the supplier to remedy it within a reasonable time. Only if the supplier refuses, or fails to remedy within a reasonable time, can the buyer reject the goods or terminate the services contract. If the failure is a major failure, the buyer can reject immediately. Under s 260, a failure is major if, among other things, the goods would not have been acquired by a reasonable consumer who knew the full extent of the failure, or the goods are substantially unfit for their common purpose and cannot easily be remedied. The services equivalent is in s 268.
There are also cooling-off rights. Under s 82 of the ACL, a consumer who enters an unsolicited consumer agreement, negotiated for example at the door or by an unsolicited telephone call, can terminate within ten business days without giving a reason.
These statutory rights cannot be contracted out of. A supplier's attempt to exclude consumer guarantees, or to shorten a cooling-off period, is generally ineffective. For a business that both buys and sells, this cuts both ways: you hold these rights as a buyer, and you are bound by them as a supplier.
Edge cases that change the picture
Three situations regularly surprise business owners:
- Force majeure clauses: Most commercial contracts include them: the event is defined, the consequences are specified, and the contract usually suspends rather than ends. Where a force majeure clause covers the event, frustration is excluded, because the parties allocated the risk themselves.
- Insolvency of the other party: Many contracts allow termination if the other party becomes insolvent or enters external administration. Since 2018 those clauses have been constrained. Under ss 451E and 454N of the Corporations Act 2001 (Cth), a right to terminate that is triggered merely because a company comes under administration or restructuring cannot be enforced during the stay period. A customer entering voluntary administration is not automatically a green light to terminate.
- Wrongful termination: If you terminate without a valid ground, your termination notice is itself a repudiation. You become the party in breach, and you can be liable for damages for the contract you tried to escape. This is the most common and the most expensive way for a business to get termination wrong.
Where a lawyer helps
The point at which advice pays for itself is before the notice goes out, not after the dispute begins. A lawyer can:
- Assess the ground: is the breached term essential? Is the breach serious enough under Koompahtoo? Is there a repudiation, frustration, or a statutory right?
- Check the process: does the contract require notice to remedy? Has the right to terminate been lost through affirmation?
- Draft the termination notice: a notice that states the wrong ground can be fatal, because you are limited to the ground you actually rely on.
- Protect the exit: advice on termination clauses, essential terms and force majeure in your next contract, so future exits are easier to make cleanly.
A focused advice session before you act is inexpensive compared with defending a wrongful termination claim, or being locked into a contract you should have been able to leave.
The notice is the moment of decision
The decision that determines the outcome of most termination disputes is made when the notice is drafted, not when the dispute reaches court. Two things are judged at that moment: whether a valid ground existed, and whether you followed the contract's own process. If the ground is solid and the process correct, the other side faces an uphill fight. If either is wrong, the notice becomes your repudiation and the damages claim flips against you.
The practical rule for a business owner is therefore simple: identify the ground, check the process, then send the notice. If you are not certain of the first two, a short conversation with a contract lawyer before you act is the cheapest insurance available, and most firms, including Artificer Legal, will discuss the situation in an initial consultation before any fees are committed.