Australian contract law comprises a combination of common law and statutory principles. While written contracts are the norm for complex commercial arrangements, there is no general requirement that all contracts be in writing.2 They may also be formed orally or by conduct. A legally enforceable contract in Australia simply requires that the following elements be satisfied regardless of the form of the contract itself:
- the existence of an offer;
- acceptance of the offer;
- consideration; and
- intention to create legal relations.
For a binding contract to exist, there must be a meeting of the minds (agreement) between the parties. This requires that one party make an offer that has been accepted by the other party.
An offer may be made in writing, orally or implied through conduct, provided it is sufficiently clear and brought to the notice of the other party. In addition, an offer must be distinguished from a mere 'invitation to treat' or statement of price.
Acceptance can be express or implied through conduct; however, it is only effective where it is unequivocal, communicated to the offering party3 and made with knowledge, and the accepting party holds a clear intention to accept the offer.ii Consideration
Consideration is an essential requirement for a binding and enforceable contract except in circumstances where the parties have entered into a formal agreement under seal, such as a deed.
Consideration must be sufficient but it need not be adequate. It does not need to be proven that the degree of consideration given forms a proportionate or fair exchange for the promises made under the contract. Valuable consideration may comprise any benefit, profit, interest or right accruing to one party, or some act of forbearance, responsibility, detriment or loss given, suffered or undertaken by the other party.iii Intention to create legal relations
Australian law requires that the parties to a contract hold an intention to create legal relations. In the context of commercial agreements, this is typically a non-issue as the parties will be presumed to have intended to create legal relations.
This is not the case for agreements in a family, social or domestic context where there is a presumption against intention. If the element of intention is in issue, it will be determined objectively, having regard to the content of the agreement, the language and conduct of the parties, the relationship between the parties and the context of the agreement as a whole.4iv Certainty and completeness of terms
The core terms of a contract (such as identification of the parties and the subject matter and price of their agreement) must generally be agreed upon and expressed in sufficiently certain terms for the contract to be enforceable. The contract must also be substantially complete; that is, it must involve an agreement that is capable of performance.
However, Australian courts tend to seek to uphold agreements and, as such, can be inclined to imply reasonable terms to preserve the validity of the contract and give effect to intention of the parties.5 Australian courts will readily do so for commercial agreements by seeking to give commercial efficacy to their terms.v Conditional contracts
Contractual terms may be conditional under Australian law. Where an agreement contains a condition precedent, the meaning and effect of the provision will be a question of construction, having regard to the intention of the parties. Conditions precedent, particularly time-related stipulations in commercial contracts, are presumed to have been given essentiality by the parties.6
Agreements made 'subject to contract' have received considerable judicial consideration in Australia. The existence of a binding contract, and whether the parties are immediately bound to some of or all its terms, is subject to the courts' characterisation of the factual circumstances.vi Forms of pre-contractual liability
If the legal requirements for the formation of a contract are not strictly satisfied, pre-contractual negotiations and representations may still give rise to enforceable rights or obligations under Australian law. Pre-contractual liability can arise in a number of ways, including:
- through an implied contract;
- in tort (such as negligence or fraud);
- under the law of equity (such as promissory estoppel); and
- by restitution or under statute (such as liability for misleading or deceptive conduct during pre-contractual negotiations under Section 18 of the Consumer Law).