
In Australia, contract law is primarily governed by common law, which holds a contract to be binding as long as the essential elements for a contract are present, such as agreement, consideration, and certainty. Common law contracts are formed in almost every aspect of our lives, from purchasing food to riding a bus, and they can be legally binding with or without paperwork. A common law contract can be deemed void or enforceable depending on various factors, such as duress, undue influence, or illegality. The law of equity also plays a significant role in Australian contracts, affecting the availability of remedies when a contractual promise is breached.
| Characteristics | Values |
|---|---|
| Governing Law | Common law, with statutes increasingly supplementing common law, especially in consumer protection |
| Similarity to Other Jurisdictions | Similar to other Anglo-American common law jurisdictions, but with differences due to statute law and High Court interpretations |
| Essential Elements | Agreement, consideration, certainty, etc. |
| Contract Interpretation | Courts favour commercially accepted results and avoid unjust consequences for parties |
| Subjective Intention | Irrelevant; contract interpretation is based on what a reasonable person would understand |
| Bargain Theory | Quid pro quo is an essential element |
| Law of Equity | Plays a significant role and affects available remedies for breach of contract |
| Doctrines | Negligent mis-statement, promissory estoppel, and misleading or deceptive conduct |
| Vitiating Factors | Misrepresentation, undue influence, unconscionable dealings, special disadvantage, etc. |
| Unfair Contracts | Australia has an unfair contract terms regime, recently expanded to include small businesses with <100 employees or $10 million annual revenue |
| Illegality | Contracts for illegal purposes are not enforceable |
| Remedies for Breach | Specific performance, injunction, restitution, rescission, etc. |
| Written Form | Not required; common law contracts can be formed without paperwork |
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What You'll Learn

Contract formation
Contract law in Australia is primarily governed by common law, but statutes are increasingly supplementing common law, especially in consumer protection. The law of contract in Australia is similar to other Anglo-American common law jurisdictions, but differences have arisen due to statute law and the divergent development of common law in the High Court.
A contract is a promise or a set of promises that is legally binding. A promise is an undertaking by one party to do something or refrain from doing something if another party does something or refrains from doing something or makes a promise in return. A promise or set of promises will be legally binding if certain criteria are met.
There are five essential elements necessary for legally binding contract formation:
- Agreement between the parties
- Consideration
- Certainty
Consideration is anything from money to a promise to undertake or not undertake a particular act. In Australian law, the question of the sufficiency of consideration does not refer to 'adequacy', as it is not a judge's role to determine the value. Sufficient consideration may include abstract exchanges such as 'love and affection'.
In certain situations, equity may intervene and make the contract either voidable or void. For example, this could be due to unconscionability, where one party is at a ''special disadvantage, or where a party exercises 'undue influence'. A common law contract that is to do something illegal is not enforceable.
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Breach of contract
Contract law in Australia is primarily governed by 'common law'. However, statutes are increasingly supplementing common law, especially in consumer protection. The law of equity also plays a significant role in Australian contracts, influencing the available remedies when a contractual promise is breached.
- Renunciatory breach: This is also known as an anticipatory breach, where a party renunciates the contract before they are required to perform their obligations.
- Breach of warranty: This is a less serious breach, and there is no "internal rating system" within this category.
- Breach of condition: This is a repudiatory breach, entitling the innocent party to terminate the contract and claim damages. This is the most severe type of breach.
A material breach is another type of breach that involves a key element of the contract not being provided or undertaken as agreed. For example, if a party purchased a computer package online but only received a monitor, the provider would have materially breached the contract.
When a breach occurs, the aggrieved party must decide whether to terminate the contract or affirm it. This decision is referred to as 'election', and once made, it is irreversible. The aggrieved party must be aware of their right to terminate and must demonstrate unequivocal conduct consistent with the performance of the contract.
The right to terminate for non-fulfilment of a contingent condition can be restricted by doctrines of estoppel, good faith, misleading or deceptive conduct, or unconscionable conduct in breach of the Australian Consumer Law.
In some cases, a "cure period" may be allowed for the defaulting party to remedy the breach. However, the innocent party may choose to accept a repudiatory breach and exercise their common law rights instead.
Remedies for Breach of Contract
When a dispute arises, the terms of the contract and supporting documentation must be carefully reviewed. Informal negotiations should be attempted before initiating legal proceedings or enforcing contractual rights. It is crucial to understand the legal procedures and time limits for dispute resolution.
If a breach of contract is proven, the innocent party may be entitled to various remedies, such as termination of the contract or damages. In some cases, equitable relief may be sought to remedy unconscionability rather than punish the wrongdoer. An example of an equitable remedy is the order of equitable rescission, which does not require restoring the parties to their pre-contract positions precisely.
Changes to Unfair Contract Terms
As of November 9, 2023, Australia's unfair contract terms regime was broadened to include "small businesses" with less than 100 employees or an annual revenue threshold of $10 million. These changes introduced new civil penalty provisions for non-compliance.
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Void contracts
A void contract is one that is not enforceable by law and is treated as if it never existed. This means that the contract is invalid due to issues with the manner in which it was originally drafted, such as a failure to adhere to the contract principles of offer, acceptance, and consideration. For instance, if a contract depends on an impossible event or requires a party to perform an impossible act, it is immediately void.
A void contract is distinct from a voidable contract, which is a valid contract that may be voided by one of the parties. In the case of a void contract, neither party can enforce it, whereas a voidable contract gives the affected party the choice to enforce it or not. If a voidable contract is cancelled, it can be reversed through rescission, restoring both parties to their original positions.
A contract may be void for several reasons, including:
- Misrepresentation: If a false statement of material fact induces a party to enter the contract, it may be voidable.
- Duress: If a party is forced or threatened into signing, they can make the contract voidable.
- Undue Influence: If one party can dominate the other's will due to their relationship and uses this power improperly, the contract may be voidable.
- Unconscionable Conduct: If a party unfairly takes advantage of another's special disadvantage, such as language barriers, the affected party may have the contract set aside.
- Lack of Capacity: Minors (under 18) and people lacking mental capacity often have the right to void contracts, except in certain circumstances.
To prevent contracts from becoming void, it is crucial to draft the terms correctly, ensuring that all parties are competent and that every term and purpose adheres to the law. Consulting a contract lawyer is recommended for unclear situations.
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Contract interpretation
The interpretation of contracts under Australian law revolves around several key principles. Firstly, the meaning of the terms is determined by what a reasonable business person would understand them to mean. Courts give express terms their plain and ordinary meaning, referring to Australian dictionaries, unless it results in absurdity. In the case of ambiguity, courts consider the surrounding circumstances, including the background, objective, and pre-contractual negotiations, to give the contract a commercially accepted interpretation that avoids inconvenience for both parties.
The "parole evidence rule" is another important consideration, which states that evidence of prior negotiations is generally not admissible for interpreting contract terms, unless it provides insight into the surrounding circumstances. Additionally, terms may be implied based on fact, law, dealing, custom, or usage, but only under limited circumstances for formal written contracts.
Australian contract law also recognises the importance of business efficacy, obviousness, clarity, and consistency in contract interpretation. A term will be implied if it is necessary for the reasonable operation of the contract, is obvious and goes without saying, can be clearly and precisely expressed, and does not contradict express terms.
It's worth noting that while Australian contract law upholds freedom of contract, allowing parties to strike bargains, certain limitations exist, such as the Competition and Consumer Act 2010 (Cth), which may override contractual rights in specific circumstances. The law also recognises oral contracts, except in land transfer cases, and places importance on documenting intentions, with written contracts holding more weight in courts.
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Consumer law
In Australia, contract law is primarily governed by 'common law'. However, statutes are increasingly supplementing common law, especially in consumer protection.
The Australian Consumer Law (ACL) is a set of rules outlining consumer rights and business responsibilities. It applies Australia-wide and is designed to ensure fair treatment for consumers and businesses. The ACL is written into Schedule 2 of the Competition and Consumer Act 2010. The Australian Government, along with state and territory governments, manages the ACL through consumer affairs ministers.
The ACL helps consumers make informed choices and ensures businesses act honestly and responsibly. It gives consumers the power to speak up about their rights and understand their entitlements. The ACL includes guarantees for consumers, such as the right to a repair, replacement, refund, contract cancellation, and claiming compensation for damages and loss. These guarantees apply to a range of products and services, including caravans and other recreational vehicles, and home care services.
The ACL also covers unfair business behaviour, such as misleading or deceptive conduct, and businesses must be clear about the total price payable. Consumers have rights when approached by salespeople in certain situations, known as unsolicited consumer agreements. Additionally, the ACL includes protections for financial products and services, covered under the Australian Securities and Investments Commission Act 2001.
The ACL is enforced by regulators under a 'one-law, multiple regulators' system, with state and territory consumer regulators enforcing the law in their respective jurisdictions. Consumers can refer to regulators' guides on steps to take to resolve disputes with businesses.
From 9 November 2023, Australia's unfair contract terms regime changed to include "small businesses" with less than 100 workers or an annual revenue threshold of $10 million. This change introduced new civil penalty provisions for non-compliance.
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Frequently asked questions
A common law contract is a promise or a set of promises that is legally binding. This means that one party will undertake or refrain from doing something in exchange for something else from another party.
For a contract to be legally binding, it must have essential elements such as agreement, consideration, certainty, etc. The contract must also not be for something illegal, as it will not be enforceable.
There are several remedies available depending on the type of breach. Some of these remedies include specific performance, injunction, and restitution.
Equity may intervene and make a contract voidable or void in certain situations. It also provides remedies for when a contractual promise is breached.
Australia's unfair contract terms regime has recently been broadened to include "small businesses" with less than 100 workers or a $10 million annual revenue threshold. This change will come into effect on November 9, 2023.











































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