What is a Letter of Authorisation and how does it differ from a Power of Attorney in Australia?

A Letter of Authorisation and a Power of Attorney are both legal documents that authorise one person (the agent or attorney) to act on behalf of another (the principal), but they differ significantly in their formality, scope, and legal effect. A Letter of Authorisation is a general-purpose, informal document used to grant authority for specific, limited purposes — for example, to collect a document, represent the principal at a particular meeting, or deal with a government agency on a specific matter. It is not subject to specific statutory requirements in most cases and can be signed without witnesses. A Power of Attorney is a formal legal document governed by specific state and territory legislation — for example, the Powers of Attorney Act 2003 (NSW), the Instruments Act 1958 (Vic) and Powers of Attorney Act 2014 (Vic), and the Powers of Attorney Act 2014 (SA). A Power of Attorney must be executed in accordance with the statutory requirements (including witnessing by a prescribed witness), and an Enduring Power of Attorney (which remains effective during the principal's incapacity) has additional formal requirements. For significant legal and financial matters — such as executing contracts for the sale of real property, managing bank accounts, or making medical decisions — a formal Power of Attorney is generally required rather than a Letter of Authorisation.

When should I use a Letter of Authorisation rather than a Power of Attorney in Australia?

A Letter of Authorisation is appropriate for specific, limited, and relatively straightforward purposes that do not require the full formality of a Power of Attorney. Common uses of a Letter of Authorisation in Australia include: authorising a representative to collect a document or certificate on your behalf from a government agency or registry; authorising a person to act as your representative at a meeting, negotiation, or government hearing for a specific purpose; authorising a business representative to enter into a specific type of contract or deal with a particular counterparty on behalf of the company; authorising a solicitor or accountant to communicate with the ATO or another government agency on your behalf for a specific matter; and authorising an employee or contractor to act within a defined scope on behalf of the business. A Power of Attorney is required — and a Letter of Authorisation is insufficient — when you need to: deal with Land Registry Services or Titles Queensland for the execution of documents relating to real property; execute a contract for the sale or purchase of land; manage bank accounts or execute financial transactions; make decisions on behalf of an incapacitated person (which requires an Enduring Power of Attorney or Guardianship Order); or act as a director or officer of a company on a continuing basis.

Can a Letter of Authorisation be revoked in Australia, and how?

Yes. A Letter of Authorisation can be revoked at any time by the principal by providing written notice to the agent. The revocation takes effect when the agent receives the written notice. The principal should also take steps to notify any third parties who have been dealing with the agent under the authorisation — for example, government agencies, counterparties, or financial institutions — that the authorisation has been revoked and that the agent no longer has authority to act on the principal's behalf. Failure to notify third parties of the revocation may mean that the principal remains bound by acts of the agent that are within the apparent scope of the original authorisation (the doctrine of apparent or ostensible authority under Australian common law). A Letter of Authorisation is also automatically revoked in certain circumstances — for example, upon the death or incapacity of the principal (unlike an Enduring Power of Attorney, which continues during incapacity), the death or bankruptcy of the agent, or the completion of the specific purpose for which the authorisation was granted. The terms of revocation should be clearly set out in the Letter of Authorisation to avoid disputes.

What are the risks of granting a Letter of Authorisation and how can they be managed?

Granting a Letter of Authorisation carries several risks that the principal should consider carefully. The principal is bound by all acts of the agent that fall within the scope of the authorisation — even if the agent acts without instructions or in a manner the principal did not specifically intend — under the law of agency in Australia. The principal may also be bound by acts of the agent that fall outside the strict scope of the authorisation if a third party dealing with the agent in good faith reasonably believed the agent had authority (the doctrine of apparent or ostensible authority, applied by the High Court in cases including Toll (FGCT) Pty Ltd v Alphapharm Pty Ltd (2004) 219 CLR 165). To manage these risks: draft the authorisation with precise and limited scope, specifying exactly what actions the agent may and may not take; include an express statement that the agent's authority is limited to the matters described in the Letter and that no greater authority is to be implied; set a fixed expiry date rather than an open-ended authorisation; revoke the authorisation promptly once the purpose has been served; and notify relevant third parties of both the grant and the revocation of the authorisation in writing.

Does a Letter of Authorisation need to be witnessed or notarised in Australia?

A Letter of Authorisation generally does not need to be witnessed or notarised to be legally effective in Australia for domestic purposes. As a general contractual document (to the extent it creates binding obligations on the agent), it need only be signed by the principal. However, there are circumstances where witnessing or notarisation may be required or advisable. If the Letter of Authorisation is to be used internationally — for example, to authorise an agent to deal with a foreign government, foreign court, or international institution — the document may need to be notarised and authenticated with an Apostille under the Hague Convention Abolishing the Requirement of Legalisation for Foreign Public Documents (which Australia has ratified). If the Letter of Authorisation is to be used in connection with dealings at a state or territory land registry or government land titles office, the specific requirements of that registry should be checked, as some registries require documents to be witnessed by a prescribed witness (for example, an Australian legal practitioner, justice of the peace, or notary public). If the agent is to execute documents as a deed, any document executed as a deed by the agent (under a deed of authority rather than a simple letter) must comply with the requirements for deeds in the relevant state or territory, including witnessing by an independent witness. Legal advice should be obtained if the Letter of Authorisation is to be used for significant or complex purposes.

Letter of Authorisation (Australia) — Australia

Create an Australian Letter of Authorisation — a formal written document granting authority to an agent or representative to act on behalf of the principal for a specific purpose. Covers precise scope of authority, specific authorised actions, scope limitations, delegation restrictions, duration (fixed period or until revoked), revocation provisions, agent obligations, and governing law. Suitable for property transactions, financial matters, government dealings, business affairs, and other personal or commercial purposes across all Australian states and territories.

What Is a Letter of Authorisation (Australia)?

An Australian Letter of Authorisation is a formal written document in which one person or entity (the Principal) grants written authority to another person or entity (the Agent or Representative) to act on the Principal's behalf for a specific purpose or within a defined scope. It is a practical legal tool that enables the Principal to delegate the right to take particular actions, execute specific documents, or deal with particular persons or organisations in the Principal's name.

Under Australian common law, the relationship between a principal and an agent is governed by the law of agency. A Letter of Authorisation formally documents the grant of actual authority — the express, written authority given by the principal to the agent to act in a defined way. Once authority is granted, the principal is legally bound by all acts of the agent that fall within the scope of the authorisation, as if the principal had taken those actions directly. The agent may also create apparent or ostensible authority — where a third party dealing with the agent in good faith reasonably believes the agent has authority — even if the agent acts beyond the express scope of the authorisation.

A Letter of Authorisation differs from a Power of Attorney in that it is an informal, purpose-specific document that does not require the statutory formalities (such as prescribed witnessing) that a Power of Attorney requires under state and territory legislation. It is used for limited and defined purposes and is not a substitute for a Power of Attorney in matters requiring the formal execution of legal documents relating to real property, management of financial accounts, or decisions during incapacity.

The Letter of Authorisation is a versatile document used across a wide range of personal and commercial contexts in Australia: authorising a family member to collect a document from a government agency; authorising a company employee to negotiate and execute a specific commercial contract; authorising a solicitor or accountant to deal with the ATO or other government body on a specific matter; authorising a representative to act at a particular meeting, tender process, or government hearing; and authorising a contractor or consultant to act within a defined scope on behalf of a business. The scope of authority must be carefully defined to protect both the Principal (from unexpected liability) and the Agent (from acting in excess of their authority).

When Do You Need a Letter of Authorisation (Australia)?

A Letter of Authorisation is needed whenever a person or organisation wishes to formally delegate authority to an agent or representative to act on their behalf for a specific purpose, and the matter does not require the full formality of a Power of Attorney.

You should use a Letter of Authorisation when: you are travelling overseas or otherwise unavailable and need to authorise a trusted person to collect a document, attend a meeting, or deal with a government agency on your behalf; your business needs to authorise a specific employee, agent, or contractor to enter into a particular type of contract, negotiate with a specific supplier or customer, or represent the business at a meeting or tender process; you need to authorise a solicitor, accountant, or financial adviser to correspond and deal with the ATO, ASIC, APRA, or another government body on a specific matter; you need to authorise a property manager, conveyancer, or real estate agent to take specific actions in connection with a property transaction on your behalf; you need to authorise a representative to act at a licensing, planning, or development application hearing before a government authority; or your organisation needs to document the internal delegation of authority from a senior officer to a subordinate for a specific purpose or transaction.

A Letter of Authorisation is particularly important when dealing with organisations or government agencies that require written evidence of a person's authority before they will accept instructions or release information. Many banks, government agencies, land registries, and commercial counterparties require a written Letter of Authorisation (or a formal Power of Attorney, depending on the nature of the matter) before they will accept instructions from an agent acting on another's behalf.

What to Include in Your Letter of Authorisation (Australia)

A well-drafted Australian Letter of Authorisation should contain the following key elements to be legally effective and to minimise the risk of disputes or misunderstanding about the scope of the agent's authority.

Clear Identification of the Principal and Agent — The Letter must clearly identify both the Principal (the person granting the authority) and the Agent (the person receiving the authority). Full legal names, ABNs (if applicable), and addresses should be provided. If the Principal or Agent is a company, the company should be clearly identified and the Letter should be signed by the appropriate authorised officers.

Precise Statement of the Purpose and Scope of Authorisation — The most important element of a Letter of Authorisation is the precise statement of what the Agent is, and is not, authorised to do. The scope of authority should be defined narrowly and specifically, listing the exact actions the Agent may take. Vague or overly broad language increases the risk that the Agent will take actions beyond what the Principal intended, for which the Principal may nonetheless be legally liable.

Specific Authorised Actions — In addition to a general description of the purpose, the Letter should list the specific actions the Agent is authorised to take. This reduces ambiguity and helps third parties verify the extent of the Agent's authority.

Scope Limitations and Prohibited Actions — The Letter should expressly state what the Agent is NOT authorised to do, particularly where there is a risk that the Agent might take an action that the Principal does not intend — for example, agreeing to a price below a specified minimum, sub-delegating authority, or entering into obligations not contemplated by the Principal.

Duration and Revocation — The Letter should specify whether the authorisation is for a fixed period (expiring on a stated date) or until revoked in writing by the Principal. An open-ended authorisation increases the risk of continued liability if the Principal forgets to revoke it once the purpose has been served.

Agent's Obligations — The Letter should set out the key obligations of the Agent: to act honestly and in the best interests of the Principal, to act within the scope of the authorisation, to keep the Principal informed, to maintain accurate records, and not to act in a conflict of interest.

Frequently Asked Questions

Related Documents

You may also find these documents useful:

Statutory Declaration (Australia)

Create a Commonwealth Statutory Declaration in the form prescribed by Schedule 1 of the Statutory Declarations Regulations 2018 (Cth). Compliant with the Statutory Declarations Act 1959 (Cth). Used for identity verification, lost documents, government applications, and other official purposes. Must be signed before an authorised witness (JP, lawyer, pharmacist, police officer, and others listed in section 8 of the Regulations).

Demand Letter (Australia)

Create a formal Australian Demand Letter for contract breaches, defective works, misrepresentation, misleading conduct, or other civil wrongs — distinct from a simple debt collection letter. This template covers the full spectrum of pre-litigation civil demands under Australian law, including the Australian Consumer Law (ACL s 18, s 20–21), common law breach of contract, and the civil procedure requirements of all Australian states and territories. A demand letter of this type is a critical pre-litigation step used whenever a party has breached a contractual obligation beyond simply failing to pay an invoice. Common examples include: a builder or contractor who has abandoned works or delivered defective construction; a supplier who has failed to deliver goods as specified or has supplied goods that do not conform to the contract description; a party who has made misrepresentations that induced the other to enter into a contract; a business that has unlawfully terminated a service or supply agreement; a party who has breached confidentiality obligations; or a business whose conduct has been misleading or deceptive in trade or commerce contrary to section 18 of the Australian Consumer Law. The Australian Consumer Law, set out in Schedule 2 to the Competition and Consumer Act 2010 (Cth), applies throughout Australia and provides powerful rights for both consumers and businesses. Section 18 prohibits conduct in trade or commerce that is misleading or deceptive, or likely to mislead or deceive. Sections 20 and 21 prohibit unconscionable conduct. Where a breach of these provisions has caused loss or damage, the affected party is entitled to recover compensation under section 236 of the ACL. A formal demand letter is the appropriate first step before commencing proceedings in the applicable court. For contract breaches at common law, the innocent party is entitled to sue for damages representing the loss suffered as a result of the breach — either expectation damages (putting the innocent party in the position they would have been in had the contract been performed) or reliance damages (reimbursing expenditure wasted in reliance on the contract). In some cases, specific performance or an injunction may be available. A demand letter is the appropriate vehicle to put the breaching party on notice, demand specific performance or damages, and provide a deadline before proceedings are commenced. The applicable civil courts in each state and territory are: the Local Court (NSW, up to $100,000), Magistrates Court (VIC, up to $100,000; QLD, up to $150,000; WA, SA, TAS), District Court or County Court (intermediate claims), and Supreme Court (high-value claims). The Australian Capital Territory and Northern Territory have their own court hierarchy. Tribunals such as NCAT (NSW) and VCAT (VIC) handle consumer and home building disputes. The limitation period for contract claims in most Australian states is 6 years from the date the cause of action arose (Limitation Act 1969 (NSW), Limitation of Actions Act 1958 (VIC), Limitation of Actions Act 1974 (QLD) and equivalent). Issuing a formal demand letter well within the limitation period is important both to preserve rights and to comply with any pre-action requirements of the applicable court. This demand letter template is suitable for use throughout Australia in all states and territories. It includes space for a full factual background, identification of the legal basis of the claim under both common law and the ACL, a precise statement of the remedy demanded (payment of damages, completion of works, rectification, delivery of goods, or specific performance), a compliance deadline, an optional legal action warning identifying the intended court, and supporting documentation references. The letter may optionally be marked 'Without Prejudice' where settlement negotiations are intended to follow.

Non-Disclosure Agreement (NDA) (Australia)

Protect your confidential business information under Australian common law with a legally sound Non-Disclosure Agreement (NDA). Whether you are sharing trade secrets with a prospective partner, disclosing proprietary technology to a developer, or presenting financial projections to a potential investor, a properly drafted Australian NDA keeps your sensitive information under strict legal protection. Our template complies with Australian contract law principles and includes provisions addressing the Privacy Act 1988 (Cth) and the Australian Privacy Principles.