An Australian Letter of Intent (LOI) — also known in some commercial contexts as a Letter of Interest, Expression of Intent, or Indicative Offer — is a formal written document in which one party expresses its intention to enter into a business transaction with another party, subject to the negotiation and execution of a formal written agreement. Unlike a binding contract, a Letter of Intent records the parties' shared commercial objectives and key proposed terms without creating legal obligations to complete the transaction.

The legal status of a Letter of Intent in Australia is determined by the High Court of Australia's landmark decision in Masters v Cameron (1955) 91 CLR 353. In that case, the Court identified three categories of preliminary agreement. In the first category, the parties are immediately and fully bound even though a formal document is to be prepared later. In the second category, the parties are bound but anticipate that the formal agreement will vary or supplement their obligations. In the third category — and the most common in commercial practice — the parties do not intend to be legally bound until the formal written agreement is duly executed. A well-drafted LOI should clearly indicate which category applies to avoid disputes about its legal effect.

Despite its generally non-binding character, an LOI commonly contains certain provisions that are expressly stated to be legally binding regardless of whether the formal agreement is ever signed. These typically include a confidentiality clause (protecting sensitive business, financial, and technical information shared during negotiations), an exclusivity clause (preventing either party from negotiating with third parties during a defined period), and a costs provision (specifying who bears the legal and advisory costs if the transaction does not proceed). Australian courts will enforce these binding ancillary provisions independently of the non-binding commercial terms.

A Letter of Intent is an important tool in Australian commercial practice. It creates a shared framework for negotiations, ensures both parties have a common understanding of the proposed transaction and its key commercial terms, and provides legal protection for sensitive information and the investment of time and resources in pursuing the transaction. It is used across a wide range of commercial contexts, from supply and service contracts to licensing deals, commercial partnerships, and preliminary steps in the acquisition of businesses or assets.

A Letter of Intent is appropriate whenever parties are in the early stages of negotiating a significant commercial arrangement and wish to record their shared intention to proceed and the key terms agreed in principle, without committing to a binding agreement before the detailed terms have been finalised.

You should use a Letter of Intent when: entering into a new supply arrangement, where the parties have agreed on the broad commercial terms (pricing, volumes, delivery schedule, quality standards) but need time to document the comprehensive supply agreement; negotiating a service contract, where the scope of services, fees, and key performance indicators have been agreed in principle but the formal agreement requires preparation; exploring a commercial licensing arrangement, where the licensor and licensee have agreed on the licensed territory, royalty rates, and term but the licence agreement requires further negotiation; establishing a commercial partnership or distribution arrangement, where the parties have agreed on the general structure but need time to prepare a formal partnership or distribution agreement; purchasing or leasing commercial equipment or property, where the principal terms have been agreed but the formal sale or lease agreement requires preparation and due diligence; and entering into a contractor or consulting engagement, where the scope of work and commercial terms are agreed but the formal engagement letter or services agreement requires preparation.

A Letter of Intent is particularly valuable in situations where: one party needs written evidence of the other party's intention to proceed in order to justify committing internal resources or making preliminary expenditures; the parties wish to protect confidential information shared during negotiations before a formal NDA is executed; the parties need to lock in exclusivity for a defined period to prevent either side from pursuing a competing transaction while negotiations are ongoing; and the parties want to establish a clear timeline and expiry date for reaching a formal agreement, preventing the negotiations from drifting indefinitely.

A well-drafted Australian Letter of Intent should contain the following key elements to be legally effective and commercially useful.

Clear Identification of Binding and Non-Binding Provisions — The most critical drafting task in any LOI is to clearly state which provisions are intended to be legally binding and which are not. Under Masters v Cameron (1955) 91 CLR 353, Australian courts look at the language of the document, the conduct of the parties, and the surrounding circumstances to determine the legal effect of each provision. The LOI should use unambiguous language such as 'this LOI is not legally binding and is subject to the execution of a formal written agreement' for the non-binding commercial terms, and 'this clause is legally binding on the parties regardless of whether a Formal Agreement is executed' for the binding ancillary provisions.

Description of the Proposed Transaction and Key Terms — The LOI should describe the nature of the proposed transaction with sufficient specificity for both parties to understand what they are agreeing to pursue. The key proposed commercial terms — price, scope, timeline, obligations of each party — should be set out clearly, even though they remain subject to further negotiation and the formal agreement.

Expiry Date — An expiry date creates a clear deadline for the parties to reach a formal agreement, after which the LOI lapses. This prevents negotiations from drifting and provides certainty about the parties' ongoing obligations. The expiry date should be set at a realistic but firm deadline, typically 30 to 90 days from signing, having regard to the complexity of the transaction and the time required to prepare the formal agreement.

Confidentiality Clause — A binding confidentiality clause protects sensitive information shared during negotiations. It should clearly define what constitutes Confidential Information, specify the permitted use, identify permitted recipients (advisers on a need-to-know basis), and state that the obligation survives the expiry or termination of the LOI.

Exclusivity Clause — A binding exclusivity clause prevents either party from pursuing a competing transaction with a third party during the negotiation period. The clause should specify the duration of the exclusivity period, the scope of the exclusivity obligation, and the consequences of breach (damages and injunctive relief).

Governing Law and Jurisdiction — The LOI should specify which Australian state or territory's law governs the document and the courts to which the parties submit for the resolution of disputes arising from the binding provisions.